Long COVID

LOS ANGELES — Metformin prescribed within a week of SARS-CoV-2 infection was associated with a 53% reduction in long COVID or death over 6 months in people without diabetes or prediabetes, according to data presented at the Infectious Disease Week (IDWeek) 2024 Annual Meeting.

Long COVID was determined by using the diagnostic code U09.9 or a computable phenotype based on symptoms and conditions. Most participants in this study were infected with the Omicron variant.

Researchers, led by Carolyn Bramante, MD, MPH, an internist, pediatrician, and obesity medicine specialist at the University of Minnesota Medical School in Minneapolis, simulated a randomized controlled trial of metformin vs control using the National COVID Cohort Collaborative (N3C) Electronic Health Record Database.

The intervention was a prescription for metformin within 6 days of SARS-CoV-2 infection. Those in the control group, which was designed to mimic placebo, had a prescription for fluvoxamine, fluticasone, ivermectin, or montelukast (all drugs that have been used off-label for COVID but have shown no effect on acute COVID outcomes in clinical trials). Exclusions included anyone with a previous metformin prescription or a comparator prescription; any indication for chronic metformin use; or a contraindication for metformin.
 

Why Study Metformin for Long COVID?

Dr. Bramante led a previous randomized controlled trial, COVID-OUT, with 1323 people that indicated metformin showed possible benefit for preventing the more severe components of COVID-19. She also led a 2020 review, in which she examined electronic health records from adults with type 2 diabetes or obesity. The researchers found that women taking metformin before they developed COVID-19 were significantly less likely to die after being hospitalized — although men didn’t see the same protective effect. Another randomized trial of 20 people found that 60% of those taking metformin vs 100% of those given a placebo had detectable SARS-CoV-2 viral load by day 4.

Other trials have highlighted the anti-inflammatory and antiviral properties of metformin. The existing evidence coupled with metformin’s well-established safety profile, led Dr. Bramante’s team to conduct the current simulated trial in people without diabetes or prediabetes. Dr. Bramante noted that metformin’s only US Food and Drug Administration–approved indication is for diabetes.

The current study featured a similar racial/ethnic makeup in the metformin and control groups: 16% and 17% were Black and 16% and 13% were Hispanic, respectively. Within 6 months, 4.0% in the metformin group developed long COVID or died compared with 8.5% in the control group (Relative Risk [RR], 0.47; 95% CI, 0.25-0.89). For prescriptions made on days 0-1 relative to infection, the RR was 0.39 (95% CI, 0.12-1.24). When metformin was prescribed on days 0-14, the RR was 0.75 (95% CI, 0.52-1.08).

The reason it’s important to have an active comparator is to control for things that can’t be measured, such as engagement in healthcare and the placebo effect, Dr. Bramante said.

Emily Erbelding, MD, MPH, director of the Division of Microbiology and Infectious Diseases at the National Institute of Allergy and Infectious Diseases, who was not part of the study, noted the potential implications of the findings.
 

Proven Safety and Low Cost of Metformin 

“We don’t have therapies for long COVID, and we don’t know how to prevent it in people who have SARS-CoV-2 infections,” Dr. Erbelding noted. “This analysis points to metformin, a drug that millions of people have taken safely for their diabetes or their borderline diabetes. It’s licensed, it’s out there, and it’s inexpensive. The fact that we have data that point to this potentially being a therapy is important. I think that’s the power of this.”

Dr. Erbelding said a strength of the study is the size of the N3C Electronic Health Record Database (with data on nearly 9 million COVID cases) the researchers used to simulate the randomized controlled trial.

“(These results) gives us a reason to think about doing a large randomized controlled study with metformin,” she said. However, there are some limitations, she noted.

“The definition of long COVID may not have been applied exactly the same way across all the patients and you don’t know what led the prescribers to prescribe metformin. There might have been confounders that couldn’t be controlled for or weren’t evident in the way they approached the data.”

This study has “relatively rigorous methodology for an observational study,” Dr. Erbelding said. “It’s novel to try to simulate a randomized controlled trial through a large, observational, electronic record–based cohort. Maybe we should be doing more of this because these bioinformatic systems exist now. And we need to get all the public health use out of them that we can.” 

“The fact that they may be unlocking something new here that needs follow-up in a truly randomized controlled trial is important as well because there are a lot of people out there suffering from long COVID.”

Bramante and Erbelding disclosed no relevant financial relationships. This research was supported in part by the intramural/extramural research program of the National Center for Advancing Translational Science, National Institutes of Health.
 

A version of this article appeared on Medscape.com.

LOS ANGELES — Metformin prescribed within a week of SARS-CoV-2 infection was associated with a 53% reduction in long COVID or death over 6 months in people without diabetes or prediabetes, according to data presented at the Infectious Disease Week (IDWeek) 2024 Annual Meeting.

Long COVID was determined by using the diagnostic code U09.9 or a computable phenotype based on symptoms and conditions. Most participants in this study were infected with the Omicron variant.

Researchers, led by Carolyn Bramante, MD, MPH, an internist, pediatrician, and obesity medicine specialist at the University of Minnesota Medical School in Minneapolis, simulated a randomized controlled trial of metformin vs control using the National COVID Cohort Collaborative (N3C) Electronic Health Record Database.

The intervention was a prescription for metformin within 6 days of SARS-CoV-2 infection. Those in the control group, which was designed to mimic placebo, had a prescription for fluvoxamine, fluticasone, ivermectin, or montelukast (all drugs that have been used off-label for COVID but have shown no effect on acute COVID outcomes in clinical trials). Exclusions included anyone with a previous metformin prescription or a comparator prescription; any indication for chronic metformin use; or a contraindication for metformin.
 

Why Study Metformin for Long COVID?

Dr. Bramante led a previous randomized controlled trial, COVID-OUT, with 1323 people that indicated metformin showed possible benefit for preventing the more severe components of COVID-19. She also led a 2020 review, in which she examined electronic health records from adults with type 2 diabetes or obesity. The researchers found that women taking metformin before they developed COVID-19 were significantly less likely to die after being hospitalized — although men didn’t see the same protective effect. Another randomized trial of 20 people found that 60% of those taking metformin vs 100% of those given a placebo had detectable SARS-CoV-2 viral load by day 4.

Other trials have highlighted the anti-inflammatory and antiviral properties of metformin. The existing evidence coupled with metformin’s well-established safety profile, led Dr. Bramante’s team to conduct the current simulated trial in people without diabetes or prediabetes. Dr. Bramante noted that metformin’s only US Food and Drug Administration–approved indication is for diabetes.

The current study featured a similar racial/ethnic makeup in the metformin and control groups: 16% and 17% were Black and 16% and 13% were Hispanic, respectively. Within 6 months, 4.0% in the metformin group developed long COVID or died compared with 8.5% in the control group (Relative Risk [RR], 0.47; 95% CI, 0.25-0.89). For prescriptions made on days 0-1 relative to infection, the RR was 0.39 (95% CI, 0.12-1.24). When metformin was prescribed on days 0-14, the RR was 0.75 (95% CI, 0.52-1.08).

The reason it’s important to have an active comparator is to control for things that can’t be measured, such as engagement in healthcare and the placebo effect, Dr. Bramante said.

Emily Erbelding, MD, MPH, director of the Division of Microbiology and Infectious Diseases at the National Institute of Allergy and Infectious Diseases, who was not part of the study, noted the potential implications of the findings.
 

Proven Safety and Low Cost of Metformin 

“We don’t have therapies for long COVID, and we don’t know how to prevent it in people who have SARS-CoV-2 infections,” Dr. Erbelding noted. “This analysis points to metformin, a drug that millions of people have taken safely for their diabetes or their borderline diabetes. It’s licensed, it’s out there, and it’s inexpensive. The fact that we have data that point to this potentially being a therapy is important. I think that’s the power of this.”

Dr. Erbelding said a strength of the study is the size of the N3C Electronic Health Record Database (with data on nearly 9 million COVID cases) the researchers used to simulate the randomized controlled trial.

“(These results) gives us a reason to think about doing a large randomized controlled study with metformin,” she said. However, there are some limitations, she noted.

“The definition of long COVID may not have been applied exactly the same way across all the patients and you don’t know what led the prescribers to prescribe metformin. There might have been confounders that couldn’t be controlled for or weren’t evident in the way they approached the data.”

This study has “relatively rigorous methodology for an observational study,” Dr. Erbelding said. “It’s novel to try to simulate a randomized controlled trial through a large, observational, electronic record–based cohort. Maybe we should be doing more of this because these bioinformatic systems exist now. And we need to get all the public health use out of them that we can.” 

“The fact that they may be unlocking something new here that needs follow-up in a truly randomized controlled trial is important as well because there are a lot of people out there suffering from long COVID.”

Bramante and Erbelding disclosed no relevant financial relationships. This research was supported in part by the intramural/extramural research program of the National Center for Advancing Translational Science, National Institutes of Health.
 

A version of this article appeared on Medscape.com.

LOS ANGELES — Metformin prescribed within a week of SARS-CoV-2 infection was associated with a 53% reduction in long COVID or death over 6 months in people without diabetes or prediabetes, according to data presented at the Infectious Disease Week (IDWeek) 2024 Annual Meeting.

Long COVID was determined by using the diagnostic code U09.9 or a computable phenotype based on symptoms and conditions. Most participants in this study were infected with the Omicron variant.

Researchers, led by Carolyn Bramante, MD, MPH, an internist, pediatrician, and obesity medicine specialist at the University of Minnesota Medical School in Minneapolis, simulated a randomized controlled trial of metformin vs control using the National COVID Cohort Collaborative (N3C) Electronic Health Record Database.

The intervention was a prescription for metformin within 6 days of SARS-CoV-2 infection. Those in the control group, which was designed to mimic placebo, had a prescription for fluvoxamine, fluticasone, ivermectin, or montelukast (all drugs that have been used off-label for COVID but have shown no effect on acute COVID outcomes in clinical trials). Exclusions included anyone with a previous metformin prescription or a comparator prescription; any indication for chronic metformin use; or a contraindication for metformin.
 

Why Study Metformin for Long COVID?

Dr. Bramante led a previous randomized controlled trial, COVID-OUT, with 1323 people that indicated metformin showed possible benefit for preventing the more severe components of COVID-19. She also led a 2020 review, in which she examined electronic health records from adults with type 2 diabetes or obesity. The researchers found that women taking metformin before they developed COVID-19 were significantly less likely to die after being hospitalized — although men didn’t see the same protective effect. Another randomized trial of 20 people found that 60% of those taking metformin vs 100% of those given a placebo had detectable SARS-CoV-2 viral load by day 4.

Other trials have highlighted the anti-inflammatory and antiviral properties of metformin. The existing evidence coupled with metformin’s well-established safety profile, led Dr. Bramante’s team to conduct the current simulated trial in people without diabetes or prediabetes. Dr. Bramante noted that metformin’s only US Food and Drug Administration–approved indication is for diabetes.

The current study featured a similar racial/ethnic makeup in the metformin and control groups: 16% and 17% were Black and 16% and 13% were Hispanic, respectively. Within 6 months, 4.0% in the metformin group developed long COVID or died compared with 8.5% in the control group (Relative Risk [RR], 0.47; 95% CI, 0.25-0.89). For prescriptions made on days 0-1 relative to infection, the RR was 0.39 (95% CI, 0.12-1.24). When metformin was prescribed on days 0-14, the RR was 0.75 (95% CI, 0.52-1.08).

The reason it’s important to have an active comparator is to control for things that can’t be measured, such as engagement in healthcare and the placebo effect, Dr. Bramante said.

Emily Erbelding, MD, MPH, director of the Division of Microbiology and Infectious Diseases at the National Institute of Allergy and Infectious Diseases, who was not part of the study, noted the potential implications of the findings.
 

Proven Safety and Low Cost of Metformin 

“We don’t have therapies for long COVID, and we don’t know how to prevent it in people who have SARS-CoV-2 infections,” Dr. Erbelding noted. “This analysis points to metformin, a drug that millions of people have taken safely for their diabetes or their borderline diabetes. It’s licensed, it’s out there, and it’s inexpensive. The fact that we have data that point to this potentially being a therapy is important. I think that’s the power of this.”

Dr. Erbelding said a strength of the study is the size of the N3C Electronic Health Record Database (with data on nearly 9 million COVID cases) the researchers used to simulate the randomized controlled trial.

“(These results) gives us a reason to think about doing a large randomized controlled study with metformin,” she said. However, there are some limitations, she noted.

“The definition of long COVID may not have been applied exactly the same way across all the patients and you don’t know what led the prescribers to prescribe metformin. There might have been confounders that couldn’t be controlled for or weren’t evident in the way they approached the data.”

This study has “relatively rigorous methodology for an observational study,” Dr. Erbelding said. “It’s novel to try to simulate a randomized controlled trial through a large, observational, electronic record–based cohort. Maybe we should be doing more of this because these bioinformatic systems exist now. And we need to get all the public health use out of them that we can.” 

“The fact that they may be unlocking something new here that needs follow-up in a truly randomized controlled trial is important as well because there are a lot of people out there suffering from long COVID.”

Bramante and Erbelding disclosed no relevant financial relationships. This research was supported in part by the intramural/extramural research program of the National Center for Advancing Translational Science, National Institutes of Health.
 

A version of this article appeared on Medscape.com.

Long COVID, a major public health crisis, is also becoming a significant economic crisis. A new study in Nature reports that the global annual economic impact of long COVID has hit $1 trillion — or about 1% of the global economy.

Long COVID is estimated to affect 6%-7% of adults. Those afflicted are often unable to work for extended periods, and some simply stop working altogether.

Besides damaging individual lives, long COVID is having wide-ranging impacts on health systems and economies worldwide, as those who suffer from it have large absences from work, leading to lower productivity. Even those who return to work after weeks, months, or even up to a year out of work may come back with worse productivity and some functional impairment — as a few of the condition’s common symptoms include fatigue and brain fog.

Experts say more is needed not only in terms of scientific research into new treatments for long COVID but also from a public policy perspective.

Long COVID’s impact on the labor force is already having ripple effects throughout the economy of the United States and other countries. Earlier this year, the US Government Accountability Office stated long COVID potentially affects up to 23 million Americans, with as many as a million people out of work. The healthcare industry is particularly hard hit.

The latest survey from the National Center for Health Statistics estimated 17.3%-18.6% of adults have experienced long COVID. This isn’t the same as those who have it now, only a broad indicator of people who’ve ever experienced symptoms.

Public health experts, economists, researchers, and physicians say they are only beginning to focus on ways to reduce long COVID’s impact.

They suggest a range of potential solutions to address the public health crisis and the economic impacts — including implementing a more thorough surveillance system to track long COVID cases, building better ventilation systems in hospitals and buildings to reduce the spread of the virus, increasing vaccination efforts as new viral strains continuously emerge, and more funding for long COVID research to better quantify and qualify the disease’s impact.
 

Shaky Statistics, Inconsistent Surveillance

David Smith, MD, an infectious disease specialist at the University of California, San Diego, said more needs to be done to survey, quantify, and qualify the impacts of long COVID on the economy before practical solutions can be identified.

“Our surveillance system sucks,” Smith said. “I can see how many people test positive for COVID, but how many of those people have long COVID?”

Long COVID also doesn’t have a true definition or standard diagnosis, which complicates surveillance efforts. It includes a spectrum of symptoms such as shortness of breath, chronic fatigue, and brain fog that linger for 2-3 months after an acute infection. But there’s no “concrete case definition,” Smith said. “And not everybody’s long COVID is exactly the same as everybody else’s.”

As a result, epidemiologists can’t effectively characterize the disease, and health economists can’t measure its exact economic impact.

Few countries have established comprehensive surveillance systems to estimate the burden of long COVID at the population level.

The United States currently tracks new cases by measuring wastewater levels, which isn’t as comprehensive as the tracking that was done during the pandemic. But positive wastewater samples can’t tell us who is infected in an area, nor can it distinguish whether a visitor/tourist or resident is mostly contributing to the wastewater analysis — an important distinction in public health studies.

Wastewater surveillance is an excellent complement to traditional disease surveillance with advantages and disadvantages, but it shouldn’t be the sole way to measure disease.
 

What Research Best Informs the Debate?

A study by Economist Impact — a think tank that partners with corporations, foundations, NGOs, and governments to help drive policy — estimated between a 0.5% and 2.3% gross domestic product (GDP) loss across eight separate countries in 2024. The study included the United Kingdom and United States.

Meanwhile, Australian researchers recently detailed how long COVID-related reductions in labor supply affected its productivity and GDP from 2022 to 2024. The study found that long COVID could be costing the Australian economy about 0.5% of its GDP, which researchers deemed a conservative estimate.

Public health researchers in New Zealand used the estimate of GDP loss in Australia to measure their own potential losses and advocated for strengthening occupational support across all sectors to protect health.

But these studies can’t quite compare with what would have to be done for the United States economy.

“New Zealand is small ... and has an excellent public health system with good delivery of vaccines and treatments…so how do we compare that to us?” Smith said. “They do better in all of their public health metrics than we do.”
 

Measuring the Economic Impact

Gopi Shah Goda, PhD, a health economist and senior fellow in economic studies at the Brookings Institution, co-authored a 2023 study that found COVID-19 reduced the US labor force by about 500,000 people.

Plus, workers who missed a full week due to COVID-19 absences became 7% less likely to return to the labor force a year later compared with workers who didn’t miss work for health reasons. That amounts to 0.2% of the labor force, a significant number.

“Even a small percent of the labor force is a big number…it’s like an extra year of populating aging,” Goda said.

“Some people who get long COVID might have dropped out of the labor force anyway,” Goda added.

The study concluded that average individual earnings lost from long COVID were $9000, and the total lost labor supply amounted to $62 billion annually — about half the estimated productivity losses from cancer or diabetes.

But research into long COVID research continues to be underfunded compared with other health conditions, experts noted.

Cancer and diabetes both receive billions of research dollars annually from the National Institutes of Health. Long COVID research gets only a few million, according to Goda.
 

Informing Public Health Policy

When it comes to caring for patients with long COVID, the big issue facing every nation’s public policy leaders is how best to allocate limited health resources.

“Public health never has enough money ... Do they buy more vaccines? Do they do educational programs? Who do they target the most?” Smith said.

Though Smith thinks the best preventative measure is increased vaccination, vaccination rates remain low in the United States.

“Unfortunately, as last fall demonstrated, there’s a lot of vaccine indifference and skepticism,” said William Schaffner, MD, an infectious disease specialist at Vanderbilt University School of Medicine, Nashville, Tennessee.

Over the past year, only 14% of eligible children and 22% of adults received the 2023-2024 COVID vaccine boosters.

Schaffner said public health experts wrestle with ways to assure the public vaccines are safe and effective.

“They’re trying to provide a level of comfort that [getting vaccinated] is the socially appropriate thing to do,” which remains a significant challenge, Schaffner said.

Some people don’t have access to vaccines and comprehensive medical services because they lack insurance, Medicaid, and Medicare. And the United States still doesn’t distribute vaccines as well as other countries, Schaffner added.

“In other countries, every doctor’s office gets vaccines for free ... here, we have a large commercial enterprise that basically runs it…there are still populations who aren’t reached,” he said.

Long COVID clinics that have opened around the country have offered help to some patients with long COVID. A year and a half ago, Yale University, New Haven, Connecticut, established its Long COVID Care Center. Stanford University, Stanford, California, opened its Long COVID Clinic back in 2021. Vanderbilt University now has its own, as well — the Adult Post-COVID Clinic.

But these clinics have faced declining federal resources, forcing some to close and others to face questions about whether they will be able to continue to operate without more aggressive federal direction and policy planning.

“With some central direction, we could provide better supportive care for the many patients with long COVID out there,” Schaffner said.

For countries with universal healthcare systems, services such as occupational health, extended sick leave, extended time for disability, and workers’ compensation benefits are readily available.

But in the United States, it’s often left to the physicians and their patients to figure out a plan.

“I think we could make physicians more aware of options for their patients…for example, regularly check eligibility for workers compensation,” Schaffner said.
 

A version of this article first appeared on Medscape.com.

Long COVID, a major public health crisis, is also becoming a significant economic crisis. A new study in Nature reports that the global annual economic impact of long COVID has hit $1 trillion — or about 1% of the global economy.

Long COVID is estimated to affect 6%-7% of adults. Those afflicted are often unable to work for extended periods, and some simply stop working altogether.

Besides damaging individual lives, long COVID is having wide-ranging impacts on health systems and economies worldwide, as those who suffer from it have large absences from work, leading to lower productivity. Even those who return to work after weeks, months, or even up to a year out of work may come back with worse productivity and some functional impairment — as a few of the condition’s common symptoms include fatigue and brain fog.

Experts say more is needed not only in terms of scientific research into new treatments for long COVID but also from a public policy perspective.

Long COVID’s impact on the labor force is already having ripple effects throughout the economy of the United States and other countries. Earlier this year, the US Government Accountability Office stated long COVID potentially affects up to 23 million Americans, with as many as a million people out of work. The healthcare industry is particularly hard hit.

The latest survey from the National Center for Health Statistics estimated 17.3%-18.6% of adults have experienced long COVID. This isn’t the same as those who have it now, only a broad indicator of people who’ve ever experienced symptoms.

Public health experts, economists, researchers, and physicians say they are only beginning to focus on ways to reduce long COVID’s impact.

They suggest a range of potential solutions to address the public health crisis and the economic impacts — including implementing a more thorough surveillance system to track long COVID cases, building better ventilation systems in hospitals and buildings to reduce the spread of the virus, increasing vaccination efforts as new viral strains continuously emerge, and more funding for long COVID research to better quantify and qualify the disease’s impact.
 

Shaky Statistics, Inconsistent Surveillance

David Smith, MD, an infectious disease specialist at the University of California, San Diego, said more needs to be done to survey, quantify, and qualify the impacts of long COVID on the economy before practical solutions can be identified.

“Our surveillance system sucks,” Smith said. “I can see how many people test positive for COVID, but how many of those people have long COVID?”

Long COVID also doesn’t have a true definition or standard diagnosis, which complicates surveillance efforts. It includes a spectrum of symptoms such as shortness of breath, chronic fatigue, and brain fog that linger for 2-3 months after an acute infection. But there’s no “concrete case definition,” Smith said. “And not everybody’s long COVID is exactly the same as everybody else’s.”

As a result, epidemiologists can’t effectively characterize the disease, and health economists can’t measure its exact economic impact.

Few countries have established comprehensive surveillance systems to estimate the burden of long COVID at the population level.

The United States currently tracks new cases by measuring wastewater levels, which isn’t as comprehensive as the tracking that was done during the pandemic. But positive wastewater samples can’t tell us who is infected in an area, nor can it distinguish whether a visitor/tourist or resident is mostly contributing to the wastewater analysis — an important distinction in public health studies.

Wastewater surveillance is an excellent complement to traditional disease surveillance with advantages and disadvantages, but it shouldn’t be the sole way to measure disease.
 

What Research Best Informs the Debate?

A study by Economist Impact — a think tank that partners with corporations, foundations, NGOs, and governments to help drive policy — estimated between a 0.5% and 2.3% gross domestic product (GDP) loss across eight separate countries in 2024. The study included the United Kingdom and United States.

Meanwhile, Australian researchers recently detailed how long COVID-related reductions in labor supply affected its productivity and GDP from 2022 to 2024. The study found that long COVID could be costing the Australian economy about 0.5% of its GDP, which researchers deemed a conservative estimate.

Public health researchers in New Zealand used the estimate of GDP loss in Australia to measure their own potential losses and advocated for strengthening occupational support across all sectors to protect health.

But these studies can’t quite compare with what would have to be done for the United States economy.

“New Zealand is small ... and has an excellent public health system with good delivery of vaccines and treatments…so how do we compare that to us?” Smith said. “They do better in all of their public health metrics than we do.”
 

Measuring the Economic Impact

Gopi Shah Goda, PhD, a health economist and senior fellow in economic studies at the Brookings Institution, co-authored a 2023 study that found COVID-19 reduced the US labor force by about 500,000 people.

Plus, workers who missed a full week due to COVID-19 absences became 7% less likely to return to the labor force a year later compared with workers who didn’t miss work for health reasons. That amounts to 0.2% of the labor force, a significant number.

“Even a small percent of the labor force is a big number…it’s like an extra year of populating aging,” Goda said.

“Some people who get long COVID might have dropped out of the labor force anyway,” Goda added.

The study concluded that average individual earnings lost from long COVID were $9000, and the total lost labor supply amounted to $62 billion annually — about half the estimated productivity losses from cancer or diabetes.

But research into long COVID research continues to be underfunded compared with other health conditions, experts noted.

Cancer and diabetes both receive billions of research dollars annually from the National Institutes of Health. Long COVID research gets only a few million, according to Goda.
 

Informing Public Health Policy

When it comes to caring for patients with long COVID, the big issue facing every nation’s public policy leaders is how best to allocate limited health resources.

“Public health never has enough money ... Do they buy more vaccines? Do they do educational programs? Who do they target the most?” Smith said.

Though Smith thinks the best preventative measure is increased vaccination, vaccination rates remain low in the United States.

“Unfortunately, as last fall demonstrated, there’s a lot of vaccine indifference and skepticism,” said William Schaffner, MD, an infectious disease specialist at Vanderbilt University School of Medicine, Nashville, Tennessee.

Over the past year, only 14% of eligible children and 22% of adults received the 2023-2024 COVID vaccine boosters.

Schaffner said public health experts wrestle with ways to assure the public vaccines are safe and effective.

“They’re trying to provide a level of comfort that [getting vaccinated] is the socially appropriate thing to do,” which remains a significant challenge, Schaffner said.

Some people don’t have access to vaccines and comprehensive medical services because they lack insurance, Medicaid, and Medicare. And the United States still doesn’t distribute vaccines as well as other countries, Schaffner added.

“In other countries, every doctor’s office gets vaccines for free ... here, we have a large commercial enterprise that basically runs it…there are still populations who aren’t reached,” he said.

Long COVID clinics that have opened around the country have offered help to some patients with long COVID. A year and a half ago, Yale University, New Haven, Connecticut, established its Long COVID Care Center. Stanford University, Stanford, California, opened its Long COVID Clinic back in 2021. Vanderbilt University now has its own, as well — the Adult Post-COVID Clinic.

But these clinics have faced declining federal resources, forcing some to close and others to face questions about whether they will be able to continue to operate without more aggressive federal direction and policy planning.

“With some central direction, we could provide better supportive care for the many patients with long COVID out there,” Schaffner said.

For countries with universal healthcare systems, services such as occupational health, extended sick leave, extended time for disability, and workers’ compensation benefits are readily available.

But in the United States, it’s often left to the physicians and their patients to figure out a plan.

“I think we could make physicians more aware of options for their patients…for example, regularly check eligibility for workers compensation,” Schaffner said.
 

A version of this article first appeared on Medscape.com.

Long COVID, a major public health crisis, is also becoming a significant economic crisis. A new study in Nature reports that the global annual economic impact of long COVID has hit $1 trillion — or about 1% of the global economy.

Long COVID is estimated to affect 6%-7% of adults. Those afflicted are often unable to work for extended periods, and some simply stop working altogether.

Besides damaging individual lives, long COVID is having wide-ranging impacts on health systems and economies worldwide, as those who suffer from it have large absences from work, leading to lower productivity. Even those who return to work after weeks, months, or even up to a year out of work may come back with worse productivity and some functional impairment — as a few of the condition’s common symptoms include fatigue and brain fog.

Experts say more is needed not only in terms of scientific research into new treatments for long COVID but also from a public policy perspective.

Long COVID’s impact on the labor force is already having ripple effects throughout the economy of the United States and other countries. Earlier this year, the US Government Accountability Office stated long COVID potentially affects up to 23 million Americans, with as many as a million people out of work. The healthcare industry is particularly hard hit.

The latest survey from the National Center for Health Statistics estimated 17.3%-18.6% of adults have experienced long COVID. This isn’t the same as those who have it now, only a broad indicator of people who’ve ever experienced symptoms.

Public health experts, economists, researchers, and physicians say they are only beginning to focus on ways to reduce long COVID’s impact.

They suggest a range of potential solutions to address the public health crisis and the economic impacts — including implementing a more thorough surveillance system to track long COVID cases, building better ventilation systems in hospitals and buildings to reduce the spread of the virus, increasing vaccination efforts as new viral strains continuously emerge, and more funding for long COVID research to better quantify and qualify the disease’s impact.
 

Shaky Statistics, Inconsistent Surveillance

David Smith, MD, an infectious disease specialist at the University of California, San Diego, said more needs to be done to survey, quantify, and qualify the impacts of long COVID on the economy before practical solutions can be identified.

“Our surveillance system sucks,” Smith said. “I can see how many people test positive for COVID, but how many of those people have long COVID?”

Long COVID also doesn’t have a true definition or standard diagnosis, which complicates surveillance efforts. It includes a spectrum of symptoms such as shortness of breath, chronic fatigue, and brain fog that linger for 2-3 months after an acute infection. But there’s no “concrete case definition,” Smith said. “And not everybody’s long COVID is exactly the same as everybody else’s.”

As a result, epidemiologists can’t effectively characterize the disease, and health economists can’t measure its exact economic impact.

Few countries have established comprehensive surveillance systems to estimate the burden of long COVID at the population level.

The United States currently tracks new cases by measuring wastewater levels, which isn’t as comprehensive as the tracking that was done during the pandemic. But positive wastewater samples can’t tell us who is infected in an area, nor can it distinguish whether a visitor/tourist or resident is mostly contributing to the wastewater analysis — an important distinction in public health studies.

Wastewater surveillance is an excellent complement to traditional disease surveillance with advantages and disadvantages, but it shouldn’t be the sole way to measure disease.
 

What Research Best Informs the Debate?

A study by Economist Impact — a think tank that partners with corporations, foundations, NGOs, and governments to help drive policy — estimated between a 0.5% and 2.3% gross domestic product (GDP) loss across eight separate countries in 2024. The study included the United Kingdom and United States.

Meanwhile, Australian researchers recently detailed how long COVID-related reductions in labor supply affected its productivity and GDP from 2022 to 2024. The study found that long COVID could be costing the Australian economy about 0.5% of its GDP, which researchers deemed a conservative estimate.

Public health researchers in New Zealand used the estimate of GDP loss in Australia to measure their own potential losses and advocated for strengthening occupational support across all sectors to protect health.

But these studies can’t quite compare with what would have to be done for the United States economy.

“New Zealand is small ... and has an excellent public health system with good delivery of vaccines and treatments…so how do we compare that to us?” Smith said. “They do better in all of their public health metrics than we do.”
 

Measuring the Economic Impact

Gopi Shah Goda, PhD, a health economist and senior fellow in economic studies at the Brookings Institution, co-authored a 2023 study that found COVID-19 reduced the US labor force by about 500,000 people.

Plus, workers who missed a full week due to COVID-19 absences became 7% less likely to return to the labor force a year later compared with workers who didn’t miss work for health reasons. That amounts to 0.2% of the labor force, a significant number.

“Even a small percent of the labor force is a big number…it’s like an extra year of populating aging,” Goda said.

“Some people who get long COVID might have dropped out of the labor force anyway,” Goda added.

The study concluded that average individual earnings lost from long COVID were $9000, and the total lost labor supply amounted to $62 billion annually — about half the estimated productivity losses from cancer or diabetes.

But research into long COVID research continues to be underfunded compared with other health conditions, experts noted.

Cancer and diabetes both receive billions of research dollars annually from the National Institutes of Health. Long COVID research gets only a few million, according to Goda.
 

Informing Public Health Policy

When it comes to caring for patients with long COVID, the big issue facing every nation’s public policy leaders is how best to allocate limited health resources.

“Public health never has enough money ... Do they buy more vaccines? Do they do educational programs? Who do they target the most?” Smith said.

Though Smith thinks the best preventative measure is increased vaccination, vaccination rates remain low in the United States.

“Unfortunately, as last fall demonstrated, there’s a lot of vaccine indifference and skepticism,” said William Schaffner, MD, an infectious disease specialist at Vanderbilt University School of Medicine, Nashville, Tennessee.

Over the past year, only 14% of eligible children and 22% of adults received the 2023-2024 COVID vaccine boosters.

Schaffner said public health experts wrestle with ways to assure the public vaccines are safe and effective.

“They’re trying to provide a level of comfort that [getting vaccinated] is the socially appropriate thing to do,” which remains a significant challenge, Schaffner said.

Some people don’t have access to vaccines and comprehensive medical services because they lack insurance, Medicaid, and Medicare. And the United States still doesn’t distribute vaccines as well as other countries, Schaffner added.

“In other countries, every doctor’s office gets vaccines for free ... here, we have a large commercial enterprise that basically runs it…there are still populations who aren’t reached,” he said.

Long COVID clinics that have opened around the country have offered help to some patients with long COVID. A year and a half ago, Yale University, New Haven, Connecticut, established its Long COVID Care Center. Stanford University, Stanford, California, opened its Long COVID Clinic back in 2021. Vanderbilt University now has its own, as well — the Adult Post-COVID Clinic.

But these clinics have faced declining federal resources, forcing some to close and others to face questions about whether they will be able to continue to operate without more aggressive federal direction and policy planning.

“With some central direction, we could provide better supportive care for the many patients with long COVID out there,” Schaffner said.

For countries with universal healthcare systems, services such as occupational health, extended sick leave, extended time for disability, and workers’ compensation benefits are readily available.

But in the United States, it’s often left to the physicians and their patients to figure out a plan.

“I think we could make physicians more aware of options for their patients…for example, regularly check eligibility for workers compensation,” Schaffner said.
 

A version of this article first appeared on Medscape.com.

Primary care doctors and specialists should advise patients who have already experienced a heart attack or stroke that they are at a higher risk for long COVID and need to take steps to avoid contracting the virus, according to new research.

The study, led by researchers at Columbia University, New York City, suggests that anyone with cardiovascular disease (CVD) — defined as having experienced a heart attack or stroke — should consider getting the updated COVID vaccine boosters. They also suggest patients with CVD take other steps to avoid an acute infection, such as avoiding crowded indoor spaces.

There is no specific test or treatment for long COVID, which can become disabling and chronic. Long COVID is defined by the failure to recover from acute COVID-19 in 90 days.

The scientists used data from nearly 5000 people enrolled in 14 established, ongoing research programs, including the 76-year-old Framingham Heart Study. The results of the analysis of the “mega-cohort” were published in JAMA Network Open.

Most of the 14 studies already had 10-20 years of data on the cardiac health of thousands of enrollees, said Norrina B. Allen, one of the authors and a cardiac epidemiologist at Northwestern University Feinberg School of Medicine in Chicago, Illinois.

“This is a particularly strong study that looked at risk factors — or individual health — prior to developing COVID and their impact on the likely of recovering from COVID,” she said.

In addition to those with CVD, women and adults with preexisting chronic illnesses took longer to recover.

More than 20% of those in the large, racially and ethnically diverse US population–based study did not recover from COVID in 90 days. The researchers found that the median self-reported time to recovery from acute infection was 20 days.

While women and those with chronic illness had a higher risk for long COVID, vaccination and infection with the Omicron variant wave were associated with shorter recovery times.

These findings make sense, said Ziyad Al-Aly, MD, chief of research at Veterans Affairs St. Louis Health Care System and clinical epidemiologist at Washington University in St. Louis, Missouri.

“We also see that COVID-19 can lead to new-onset cardiovascular disease,” said Al-Aly, who was not involved in the study. “There is clearly a (link) between COVID and cardiovascular disease. These two seem to be intimately intertwined. In my view, this emphasizes the importance of targeting these individuals for vaccination and potentially antivirals (when they get infected) to help reduce their risk of adverse events and ameliorate their chance of full and fast recovery.”

The study used data from the Collaborative Cohort of Cohorts for COVID-19 Research. The long list of researchers contributing to this study includes epidemiologists, biostatisticians, neurologists, pulmonologists, and cardiologists. The data come from a list of cohorts like the Framingham Heart Study, which identified key risk factors for CVD, including cholesterol levels. Other studies include the Atherosclerosis Risk in Communities study, which began in the mid-1980s. Researchers there recruited a cohort of 15,792 men and women in rural North Carolina and Mississippi and suburban Minneapolis. They enrolled a high number of African American participants, who have been underrepresented in past studies. Other cohorts focused on young adults with CVD and Hispanics, while another focused on people with chronic obstructive pulmonary disease.

Lead author Elizabeth C. Oelsner, MD, of Columbia University Irving Medical Center in New York City, said she was not surprised by the CVD-long COVID link.

“We were aware that individuals with CVD were at higher risk of a more severe acute infection,” she said. “We were also seeing evidence that long and severe infection led to persistent symptoms.”

Oelsner noted that many patients still take more than 3 months to recover, even during the Omicron wave.

“While that has improved over the course of the pandemic, many individuals are taking a very long time to recover, and that can have a huge burden on the patient,” she said.

She encourages healthcare providers to tell patients at higher risk to take steps to avoid the virus, including vaccination and boosters.

A version of this article first appeared on Medscape.com.

Primary care doctors and specialists should advise patients who have already experienced a heart attack or stroke that they are at a higher risk for long COVID and need to take steps to avoid contracting the virus, according to new research.

The study, led by researchers at Columbia University, New York City, suggests that anyone with cardiovascular disease (CVD) — defined as having experienced a heart attack or stroke — should consider getting the updated COVID vaccine boosters. They also suggest patients with CVD take other steps to avoid an acute infection, such as avoiding crowded indoor spaces.

There is no specific test or treatment for long COVID, which can become disabling and chronic. Long COVID is defined by the failure to recover from acute COVID-19 in 90 days.

The scientists used data from nearly 5000 people enrolled in 14 established, ongoing research programs, including the 76-year-old Framingham Heart Study. The results of the analysis of the “mega-cohort” were published in JAMA Network Open.

Most of the 14 studies already had 10-20 years of data on the cardiac health of thousands of enrollees, said Norrina B. Allen, one of the authors and a cardiac epidemiologist at Northwestern University Feinberg School of Medicine in Chicago, Illinois.

“This is a particularly strong study that looked at risk factors — or individual health — prior to developing COVID and their impact on the likely of recovering from COVID,” she said.

In addition to those with CVD, women and adults with preexisting chronic illnesses took longer to recover.

More than 20% of those in the large, racially and ethnically diverse US population–based study did not recover from COVID in 90 days. The researchers found that the median self-reported time to recovery from acute infection was 20 days.

While women and those with chronic illness had a higher risk for long COVID, vaccination and infection with the Omicron variant wave were associated with shorter recovery times.

These findings make sense, said Ziyad Al-Aly, MD, chief of research at Veterans Affairs St. Louis Health Care System and clinical epidemiologist at Washington University in St. Louis, Missouri.

“We also see that COVID-19 can lead to new-onset cardiovascular disease,” said Al-Aly, who was not involved in the study. “There is clearly a (link) between COVID and cardiovascular disease. These two seem to be intimately intertwined. In my view, this emphasizes the importance of targeting these individuals for vaccination and potentially antivirals (when they get infected) to help reduce their risk of adverse events and ameliorate their chance of full and fast recovery.”

The study used data from the Collaborative Cohort of Cohorts for COVID-19 Research. The long list of researchers contributing to this study includes epidemiologists, biostatisticians, neurologists, pulmonologists, and cardiologists. The data come from a list of cohorts like the Framingham Heart Study, which identified key risk factors for CVD, including cholesterol levels. Other studies include the Atherosclerosis Risk in Communities study, which began in the mid-1980s. Researchers there recruited a cohort of 15,792 men and women in rural North Carolina and Mississippi and suburban Minneapolis. They enrolled a high number of African American participants, who have been underrepresented in past studies. Other cohorts focused on young adults with CVD and Hispanics, while another focused on people with chronic obstructive pulmonary disease.

Lead author Elizabeth C. Oelsner, MD, of Columbia University Irving Medical Center in New York City, said she was not surprised by the CVD-long COVID link.

“We were aware that individuals with CVD were at higher risk of a more severe acute infection,” she said. “We were also seeing evidence that long and severe infection led to persistent symptoms.”

Oelsner noted that many patients still take more than 3 months to recover, even during the Omicron wave.

“While that has improved over the course of the pandemic, many individuals are taking a very long time to recover, and that can have a huge burden on the patient,” she said.

She encourages healthcare providers to tell patients at higher risk to take steps to avoid the virus, including vaccination and boosters.

A version of this article first appeared on Medscape.com.

Primary care doctors and specialists should advise patients who have already experienced a heart attack or stroke that they are at a higher risk for long COVID and need to take steps to avoid contracting the virus, according to new research.

The study, led by researchers at Columbia University, New York City, suggests that anyone with cardiovascular disease (CVD) — defined as having experienced a heart attack or stroke — should consider getting the updated COVID vaccine boosters. They also suggest patients with CVD take other steps to avoid an acute infection, such as avoiding crowded indoor spaces.

There is no specific test or treatment for long COVID, which can become disabling and chronic. Long COVID is defined by the failure to recover from acute COVID-19 in 90 days.

The scientists used data from nearly 5000 people enrolled in 14 established, ongoing research programs, including the 76-year-old Framingham Heart Study. The results of the analysis of the “mega-cohort” were published in JAMA Network Open.

Most of the 14 studies already had 10-20 years of data on the cardiac health of thousands of enrollees, said Norrina B. Allen, one of the authors and a cardiac epidemiologist at Northwestern University Feinberg School of Medicine in Chicago, Illinois.

“This is a particularly strong study that looked at risk factors — or individual health — prior to developing COVID and their impact on the likely of recovering from COVID,” she said.

In addition to those with CVD, women and adults with preexisting chronic illnesses took longer to recover.

More than 20% of those in the large, racially and ethnically diverse US population–based study did not recover from COVID in 90 days. The researchers found that the median self-reported time to recovery from acute infection was 20 days.

While women and those with chronic illness had a higher risk for long COVID, vaccination and infection with the Omicron variant wave were associated with shorter recovery times.

These findings make sense, said Ziyad Al-Aly, MD, chief of research at Veterans Affairs St. Louis Health Care System and clinical epidemiologist at Washington University in St. Louis, Missouri.

“We also see that COVID-19 can lead to new-onset cardiovascular disease,” said Al-Aly, who was not involved in the study. “There is clearly a (link) between COVID and cardiovascular disease. These two seem to be intimately intertwined. In my view, this emphasizes the importance of targeting these individuals for vaccination and potentially antivirals (when they get infected) to help reduce their risk of adverse events and ameliorate their chance of full and fast recovery.”

The study used data from the Collaborative Cohort of Cohorts for COVID-19 Research. The long list of researchers contributing to this study includes epidemiologists, biostatisticians, neurologists, pulmonologists, and cardiologists. The data come from a list of cohorts like the Framingham Heart Study, which identified key risk factors for CVD, including cholesterol levels. Other studies include the Atherosclerosis Risk in Communities study, which began in the mid-1980s. Researchers there recruited a cohort of 15,792 men and women in rural North Carolina and Mississippi and suburban Minneapolis. They enrolled a high number of African American participants, who have been underrepresented in past studies. Other cohorts focused on young adults with CVD and Hispanics, while another focused on people with chronic obstructive pulmonary disease.

Lead author Elizabeth C. Oelsner, MD, of Columbia University Irving Medical Center in New York City, said she was not surprised by the CVD-long COVID link.

“We were aware that individuals with CVD were at higher risk of a more severe acute infection,” she said. “We were also seeing evidence that long and severe infection led to persistent symptoms.”

Oelsner noted that many patients still take more than 3 months to recover, even during the Omicron wave.

“While that has improved over the course of the pandemic, many individuals are taking a very long time to recover, and that can have a huge burden on the patient,” she said.

She encourages healthcare providers to tell patients at higher risk to take steps to avoid the virus, including vaccination and boosters.

A version of this article first appeared on Medscape.com.

Depending on one’s perspective, “mast cell activation syndrome (MCAS)” is either a relatively rare, narrowly defined severe allergic condition or a vastly underrecognized underlying cause of multiple chronic inflammatory conditions that affect roughly 17% of the entire population. 

Inappropriate activation of mast cells — now termed mast cell activation disease (MCAD) — has long been known to underlie allergic symptoms and inflammation, and far less commonly, neoplasias such as mastocytosis. The concept of chronic, persistent MCAS associated with aberrant growth and dystrophism is more recent, emerging only in the last couple of decades as a separate entity under the MCAD heading. 

Observational studies and clinical experience have linked signs and symptoms of MCAS with other inflammatory chronic conditions such as hypermobile Ehlers-Danlos Syndrome (EDS), postural orthostatic tachycardia syndrome (POTS), myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS), and recently, long COVID. However, those conditions themselves are diagnostically challenging, and as yet there is no proof of causation.

The idea that MCAS is the entity — or at least, a key one — at the center of “a confoundingly, extraordinarily heterogeneous chronic multisystem polymorbidity” was the theme of a recent 4-day meeting of a professional group informally dubbed “Masterminds.” Since their first meeting in 2018, the group has grown from about 35 to nearly 650 multidisciplinary professionals. 

Stephanie L. Grach, MD, assistant professor of medicine at the Mayo Clinic, Rochester, Minnesota, gave an introductory talk about the importance of changing “the medical paradigm around complex chronic illness.” Much of the rest of the meeting was devoted to sharing approaches for managing MCAS comorbidities, including dysautonomia, hypermobility, and associated craniocervical dysfunction, and various other multi-system conditions characterized by chronic pain and/or fatigue. Several talks covered the use of agents that block mast cell activity as potential treatment. 

In an interview, Grach said “the meeting was an exciting example of how not only research, but also medicine, is moving forward, and it’s really cool to see that people are independently coming to very similar conclusions about shared pathologies, and because of that, the importance of overlap amongst complex medical conditions that historically have really been poorly addressed.”

She added, “mast cell activation, or mast cell hyperactivity, is one part of the greater picture. What’s important about the mast cell component is that of the multiple different targetable pathologies, it’s one that currently has potential available therapies that can be explored, some of them relatively easily.”

But Christopher Chang, MD, PhD, chief of the Pediatric Allergy and Immunology program, Joe DiMaggio Children’s Hospital, Hollywood, Florida, sees it differently. In an interview, he noted that the reason for disagreement over what constitutes MCAS is that “it doesn’t have a lot of objective findings that we can identify. ... We know that mast cells are important immune cells, just like all immune cells are important. It seems like whenever someone has unexplained symptoms, people try to blame it on mast cells. But it’s very hard to prove that.” 
 

Two Definitions Characterize the Illness Differently

One proposed “consensus” MCAS definition was first published in 2011 by a group led by hematologist Peter Valent, MD, of the Medical University of Vienna in Austria. It has been revised since, and similar versions adopted by medical societies, including the American Academy of Allergy, Asthma & Immunology (AAAAI). The most recent versions propose three core MCAS criteria: 

• Typical clinical signs of severe, recurrent (episodic) systemic (at least two organ systems) MCA are present (often in the form of anaphylaxis).
• The involvement of mast cells (MCs) is documented by biochemical studies, preferably an increase in serum tryptase levels from the individual’s baseline to plus 20% + 2 ng/mL.
• Response of symptoms to therapy with MC-stabilizing agents, drugs directed against MC mediator production, or drugs blocking mediator release or effects of MC-derived mediators.

The following year, a separate publication authored by Gerhard J. Molderings, MD, University of Bonn in Germany, and colleagues proposed a much broader MCAS definition. Also revised since, the latest “consensus-2” was published in 2020. This definition consists of one major criterion: “A constellation of clinical complaints attributable to pathologically increased MC activity, ie, MC mediator release syndrome.” This “constellation” involves conditions of nearly every organ system that, taken together, are estimated to affect up to 17% of the entire population. These are just a few examples: 

• Constitutional: Chronic fatigue, flushing, or sweats
• Dermatologic: Rashes or lesions
• Ophthalmologic: dry eyes
• Oral: Burning or itching in mouth
• Pulmonary: Airway inflammation at any/all levels
• Cardiovascular: Blood pressure lability or codiagnosis of POTS is common
• Gastrointestinal: Reflux, dysphagia, or malabsorption
• Genitourinary: Endometriosis, dysmenorrhea, or dyspareunia
• Musculoskeletal/connective tissue: Fibromyalgia or diagnosis of hypermobile EDS is common
• Neurologic: Headaches or sensory neuropathies
• Psychiatric: Depression or anxiety
• Endocrinologic: Thyroid disease or dyslipidemia
• Hematologic: Polycythemia or anemia (after ruling out other causes)

The diagnosis is made by fulfilling that major criterion, plus at least one objective assessment of pathologically increased release of MC mediators, including infiltrates, abnormal MC morphology, or MC genetic changes shown to increase MC activity. Other alternatives include evidence of above-normal levels of MC mediators, including tryptase, histamine or its metabolites, heparin, or chromatin A, in whole blood, serum, plasma, or urine. Symptomatic response to MC activation inhibitors can also be used but isn’t required as it is in the other definition. 
 

Underdiagnosis vs Overdiagnosis

Lawrence B. Afrin, MD, senior consultant in hematology/oncology at the AIM Center for Personalized Medicine, Westchester, New York, and lead author of the 2020 update of the broader “consensus-2” criteria, said in an interview, “we now know MCAS exists, and it’s prevalent, even though, for understandable and forgivable reasons, we’ve been missing it all along. ... If you see a patient who has this chronic, multisystem unwellness with general themes of inflammation plus or minus allergic issues and you can’t find some other rational explanation that better accounts for what’s going on ... then it’s reasonable to think to include MCAS in the differential diagnosis. If the patient happens not to fit the diagnostic criteria being advanced by one group, that doesn’t necessarily rule out the possibility that this is still going on.”

Afrin, along with his coauthors, faulted the narrower “consensus-1” definition for lacking data to support the “20% + 2” criteria for requiring the difficult determination of a patient’s “baseline” and for requiring evidence of response to treatment prior to making the diagnosis. Not all patients will respond to a given histamine blocker, he noted. 

But Lawrence B. Schwartz, MD, PhD, an author on both the Valent and AAAAI criteria, disagreed, noting that the narrower criteria “appear to have a high degree of specificity and sensitivity when the reaction is systemic and involves hypotension. Less severe clinical events, particularly involving the gastrointestinal or central nervous systems, do not have precise clinical or biomarker criteria for identifying mast cell involvement.” 

Added Schwartz, who is professor of medicine and chair of the Division of Rheumatology, Allergy, and Immunology and program director of Allergy and Immunology, Virginia Commonwealth University (VCU), Richmond, “when mast cell activation events occur only in the skin, we refer to it as chronic urticaria and in the airways or conjunctiva of allergic individuals as allergic asthma, rhinitis, and/or conjunctivitis. The absence of specific criteria for mast cell activation in the GI [gastrointestinal] tract or CNS [central nervous system] neither rules in mast cell involvement nor does it rule out mast cell involvement. Thus, more research is needed to find better diagnostic criteria.”

Schwartz also pointed to a recent paper reporting the use of artificial intelligence models to “quantify diagnostic precision and specificity” of “alternative” MCAS definitions. The conclusion was a “lack of specificity is pronounced in relation to multiple control criteria, raising the concern that alternative criteria could disproportionately contribute to MCAS overdiagnosis, to the exclusion of more appropriate diagnoses.”

During the meeting, Afrin acknowledged that the broader view risks overdiagnosis of MCAS. However, he also referenced Occam’s razor, the principle that the simplest explanation is probably the best one. “Which scenario is more likely? Multiple diagnoses and problems that are all independent of each other vs one diagnosis that’s biologically capable of causing most or all of the findings, ie, the simplest solution even if it’s not the most immediately obvious solution?”

He said in an interview: “Do we have any proof that MCAS is what’s underlying hypermobile Ehlers-Danlos or POTS or chronic fatigue? No, we don’t have any proof, not because anybody has done studies that have shown there to be no connection but simply because we’re so early in our awareness that the disease even exists that the necessary studies haven’t even been done yet.”

At the meeting, Afrin introduced proposals to turn the “Masterminds” group into a formal professional society and to launch a journal. He also gave an update on progress in developing a symptom assessment tool both for clinical use and to enable clinical trials of new drugs to target mast cells or their mediators. The plan is to field test the tool in 2025 and publish those results in 2026. 

Grach, Afrin, and Chang had no disclosures. Schwartz discovered tryptase and invented the Thermo Fisher tryptase assay, for which his institution (VCU) receives royalties that are shared with him. He also invented monoclonal antibodies used for detecting mast cells or basophils, for which VCU receives royalties from several companies, including Millipore, Santa Cruz, BioLegend, and Hycult Biotech, that are also shared with him. He is a paid consultant for Blueprint Medicines, Celldex Therapeutics, Invea, Third Harmonic Bio, HYCOR Biomedical, Jasper, TerSera Therapeutics, and GLG. He also serves on an AstraZeneca data safety monitoring board for a clinical trial involving benralizumab treatment of hypereosinophilic syndrome and receives royalties from UpToDate (biomarkers for anaphylaxis) and Goldman-Cecil Medicine (anaphylaxis).

A version of this article first appeared on Medscape.com.

Depending on one’s perspective, “mast cell activation syndrome (MCAS)” is either a relatively rare, narrowly defined severe allergic condition or a vastly underrecognized underlying cause of multiple chronic inflammatory conditions that affect roughly 17% of the entire population. 

Inappropriate activation of mast cells — now termed mast cell activation disease (MCAD) — has long been known to underlie allergic symptoms and inflammation, and far less commonly, neoplasias such as mastocytosis. The concept of chronic, persistent MCAS associated with aberrant growth and dystrophism is more recent, emerging only in the last couple of decades as a separate entity under the MCAD heading. 

Observational studies and clinical experience have linked signs and symptoms of MCAS with other inflammatory chronic conditions such as hypermobile Ehlers-Danlos Syndrome (EDS), postural orthostatic tachycardia syndrome (POTS), myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS), and recently, long COVID. However, those conditions themselves are diagnostically challenging, and as yet there is no proof of causation.

The idea that MCAS is the entity — or at least, a key one — at the center of “a confoundingly, extraordinarily heterogeneous chronic multisystem polymorbidity” was the theme of a recent 4-day meeting of a professional group informally dubbed “Masterminds.” Since their first meeting in 2018, the group has grown from about 35 to nearly 650 multidisciplinary professionals. 

Stephanie L. Grach, MD, assistant professor of medicine at the Mayo Clinic, Rochester, Minnesota, gave an introductory talk about the importance of changing “the medical paradigm around complex chronic illness.” Much of the rest of the meeting was devoted to sharing approaches for managing MCAS comorbidities, including dysautonomia, hypermobility, and associated craniocervical dysfunction, and various other multi-system conditions characterized by chronic pain and/or fatigue. Several talks covered the use of agents that block mast cell activity as potential treatment. 

In an interview, Grach said “the meeting was an exciting example of how not only research, but also medicine, is moving forward, and it’s really cool to see that people are independently coming to very similar conclusions about shared pathologies, and because of that, the importance of overlap amongst complex medical conditions that historically have really been poorly addressed.”

She added, “mast cell activation, or mast cell hyperactivity, is one part of the greater picture. What’s important about the mast cell component is that of the multiple different targetable pathologies, it’s one that currently has potential available therapies that can be explored, some of them relatively easily.”

But Christopher Chang, MD, PhD, chief of the Pediatric Allergy and Immunology program, Joe DiMaggio Children’s Hospital, Hollywood, Florida, sees it differently. In an interview, he noted that the reason for disagreement over what constitutes MCAS is that “it doesn’t have a lot of objective findings that we can identify. ... We know that mast cells are important immune cells, just like all immune cells are important. It seems like whenever someone has unexplained symptoms, people try to blame it on mast cells. But it’s very hard to prove that.” 
 

Two Definitions Characterize the Illness Differently

One proposed “consensus” MCAS definition was first published in 2011 by a group led by hematologist Peter Valent, MD, of the Medical University of Vienna in Austria. It has been revised since, and similar versions adopted by medical societies, including the American Academy of Allergy, Asthma & Immunology (AAAAI). The most recent versions propose three core MCAS criteria: 

• Typical clinical signs of severe, recurrent (episodic) systemic (at least two organ systems) MCA are present (often in the form of anaphylaxis).
• The involvement of mast cells (MCs) is documented by biochemical studies, preferably an increase in serum tryptase levels from the individual’s baseline to plus 20% + 2 ng/mL.
• Response of symptoms to therapy with MC-stabilizing agents, drugs directed against MC mediator production, or drugs blocking mediator release or effects of MC-derived mediators.

The following year, a separate publication authored by Gerhard J. Molderings, MD, University of Bonn in Germany, and colleagues proposed a much broader MCAS definition. Also revised since, the latest “consensus-2” was published in 2020. This definition consists of one major criterion: “A constellation of clinical complaints attributable to pathologically increased MC activity, ie, MC mediator release syndrome.” This “constellation” involves conditions of nearly every organ system that, taken together, are estimated to affect up to 17% of the entire population. These are just a few examples: 

• Constitutional: Chronic fatigue, flushing, or sweats
• Dermatologic: Rashes or lesions
• Ophthalmologic: dry eyes
• Oral: Burning or itching in mouth
• Pulmonary: Airway inflammation at any/all levels
• Cardiovascular: Blood pressure lability or codiagnosis of POTS is common
• Gastrointestinal: Reflux, dysphagia, or malabsorption
• Genitourinary: Endometriosis, dysmenorrhea, or dyspareunia
• Musculoskeletal/connective tissue: Fibromyalgia or diagnosis of hypermobile EDS is common
• Neurologic: Headaches or sensory neuropathies
• Psychiatric: Depression or anxiety
• Endocrinologic: Thyroid disease or dyslipidemia
• Hematologic: Polycythemia or anemia (after ruling out other causes)

The diagnosis is made by fulfilling that major criterion, plus at least one objective assessment of pathologically increased release of MC mediators, including infiltrates, abnormal MC morphology, or MC genetic changes shown to increase MC activity. Other alternatives include evidence of above-normal levels of MC mediators, including tryptase, histamine or its metabolites, heparin, or chromatin A, in whole blood, serum, plasma, or urine. Symptomatic response to MC activation inhibitors can also be used but isn’t required as it is in the other definition. 
 

Underdiagnosis vs Overdiagnosis

Lawrence B. Afrin, MD, senior consultant in hematology/oncology at the AIM Center for Personalized Medicine, Westchester, New York, and lead author of the 2020 update of the broader “consensus-2” criteria, said in an interview, “we now know MCAS exists, and it’s prevalent, even though, for understandable and forgivable reasons, we’ve been missing it all along. ... If you see a patient who has this chronic, multisystem unwellness with general themes of inflammation plus or minus allergic issues and you can’t find some other rational explanation that better accounts for what’s going on ... then it’s reasonable to think to include MCAS in the differential diagnosis. If the patient happens not to fit the diagnostic criteria being advanced by one group, that doesn’t necessarily rule out the possibility that this is still going on.”

Afrin, along with his coauthors, faulted the narrower “consensus-1” definition for lacking data to support the “20% + 2” criteria for requiring the difficult determination of a patient’s “baseline” and for requiring evidence of response to treatment prior to making the diagnosis. Not all patients will respond to a given histamine blocker, he noted. 

But Lawrence B. Schwartz, MD, PhD, an author on both the Valent and AAAAI criteria, disagreed, noting that the narrower criteria “appear to have a high degree of specificity and sensitivity when the reaction is systemic and involves hypotension. Less severe clinical events, particularly involving the gastrointestinal or central nervous systems, do not have precise clinical or biomarker criteria for identifying mast cell involvement.” 

Added Schwartz, who is professor of medicine and chair of the Division of Rheumatology, Allergy, and Immunology and program director of Allergy and Immunology, Virginia Commonwealth University (VCU), Richmond, “when mast cell activation events occur only in the skin, we refer to it as chronic urticaria and in the airways or conjunctiva of allergic individuals as allergic asthma, rhinitis, and/or conjunctivitis. The absence of specific criteria for mast cell activation in the GI [gastrointestinal] tract or CNS [central nervous system] neither rules in mast cell involvement nor does it rule out mast cell involvement. Thus, more research is needed to find better diagnostic criteria.”

Schwartz also pointed to a recent paper reporting the use of artificial intelligence models to “quantify diagnostic precision and specificity” of “alternative” MCAS definitions. The conclusion was a “lack of specificity is pronounced in relation to multiple control criteria, raising the concern that alternative criteria could disproportionately contribute to MCAS overdiagnosis, to the exclusion of more appropriate diagnoses.”

During the meeting, Afrin acknowledged that the broader view risks overdiagnosis of MCAS. However, he also referenced Occam’s razor, the principle that the simplest explanation is probably the best one. “Which scenario is more likely? Multiple diagnoses and problems that are all independent of each other vs one diagnosis that’s biologically capable of causing most or all of the findings, ie, the simplest solution even if it’s not the most immediately obvious solution?”

He said in an interview: “Do we have any proof that MCAS is what’s underlying hypermobile Ehlers-Danlos or POTS or chronic fatigue? No, we don’t have any proof, not because anybody has done studies that have shown there to be no connection but simply because we’re so early in our awareness that the disease even exists that the necessary studies haven’t even been done yet.”

At the meeting, Afrin introduced proposals to turn the “Masterminds” group into a formal professional society and to launch a journal. He also gave an update on progress in developing a symptom assessment tool both for clinical use and to enable clinical trials of new drugs to target mast cells or their mediators. The plan is to field test the tool in 2025 and publish those results in 2026. 

Grach, Afrin, and Chang had no disclosures. Schwartz discovered tryptase and invented the Thermo Fisher tryptase assay, for which his institution (VCU) receives royalties that are shared with him. He also invented monoclonal antibodies used for detecting mast cells or basophils, for which VCU receives royalties from several companies, including Millipore, Santa Cruz, BioLegend, and Hycult Biotech, that are also shared with him. He is a paid consultant for Blueprint Medicines, Celldex Therapeutics, Invea, Third Harmonic Bio, HYCOR Biomedical, Jasper, TerSera Therapeutics, and GLG. He also serves on an AstraZeneca data safety monitoring board for a clinical trial involving benralizumab treatment of hypereosinophilic syndrome and receives royalties from UpToDate (biomarkers for anaphylaxis) and Goldman-Cecil Medicine (anaphylaxis).

A version of this article first appeared on Medscape.com.

Depending on one’s perspective, “mast cell activation syndrome (MCAS)” is either a relatively rare, narrowly defined severe allergic condition or a vastly underrecognized underlying cause of multiple chronic inflammatory conditions that affect roughly 17% of the entire population. 

Inappropriate activation of mast cells — now termed mast cell activation disease (MCAD) — has long been known to underlie allergic symptoms and inflammation, and far less commonly, neoplasias such as mastocytosis. The concept of chronic, persistent MCAS associated with aberrant growth and dystrophism is more recent, emerging only in the last couple of decades as a separate entity under the MCAD heading. 

Observational studies and clinical experience have linked signs and symptoms of MCAS with other inflammatory chronic conditions such as hypermobile Ehlers-Danlos Syndrome (EDS), postural orthostatic tachycardia syndrome (POTS), myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS), and recently, long COVID. However, those conditions themselves are diagnostically challenging, and as yet there is no proof of causation.

The idea that MCAS is the entity — or at least, a key one — at the center of “a confoundingly, extraordinarily heterogeneous chronic multisystem polymorbidity” was the theme of a recent 4-day meeting of a professional group informally dubbed “Masterminds.” Since their first meeting in 2018, the group has grown from about 35 to nearly 650 multidisciplinary professionals. 

Stephanie L. Grach, MD, assistant professor of medicine at the Mayo Clinic, Rochester, Minnesota, gave an introductory talk about the importance of changing “the medical paradigm around complex chronic illness.” Much of the rest of the meeting was devoted to sharing approaches for managing MCAS comorbidities, including dysautonomia, hypermobility, and associated craniocervical dysfunction, and various other multi-system conditions characterized by chronic pain and/or fatigue. Several talks covered the use of agents that block mast cell activity as potential treatment. 

In an interview, Grach said “the meeting was an exciting example of how not only research, but also medicine, is moving forward, and it’s really cool to see that people are independently coming to very similar conclusions about shared pathologies, and because of that, the importance of overlap amongst complex medical conditions that historically have really been poorly addressed.”

She added, “mast cell activation, or mast cell hyperactivity, is one part of the greater picture. What’s important about the mast cell component is that of the multiple different targetable pathologies, it’s one that currently has potential available therapies that can be explored, some of them relatively easily.”

But Christopher Chang, MD, PhD, chief of the Pediatric Allergy and Immunology program, Joe DiMaggio Children’s Hospital, Hollywood, Florida, sees it differently. In an interview, he noted that the reason for disagreement over what constitutes MCAS is that “it doesn’t have a lot of objective findings that we can identify. ... We know that mast cells are important immune cells, just like all immune cells are important. It seems like whenever someone has unexplained symptoms, people try to blame it on mast cells. But it’s very hard to prove that.” 
 

Two Definitions Characterize the Illness Differently

One proposed “consensus” MCAS definition was first published in 2011 by a group led by hematologist Peter Valent, MD, of the Medical University of Vienna in Austria. It has been revised since, and similar versions adopted by medical societies, including the American Academy of Allergy, Asthma & Immunology (AAAAI). The most recent versions propose three core MCAS criteria: 

• Typical clinical signs of severe, recurrent (episodic) systemic (at least two organ systems) MCA are present (often in the form of anaphylaxis).
• The involvement of mast cells (MCs) is documented by biochemical studies, preferably an increase in serum tryptase levels from the individual’s baseline to plus 20% + 2 ng/mL.
• Response of symptoms to therapy with MC-stabilizing agents, drugs directed against MC mediator production, or drugs blocking mediator release or effects of MC-derived mediators.

The following year, a separate publication authored by Gerhard J. Molderings, MD, University of Bonn in Germany, and colleagues proposed a much broader MCAS definition. Also revised since, the latest “consensus-2” was published in 2020. This definition consists of one major criterion: “A constellation of clinical complaints attributable to pathologically increased MC activity, ie, MC mediator release syndrome.” This “constellation” involves conditions of nearly every organ system that, taken together, are estimated to affect up to 17% of the entire population. These are just a few examples: 

• Constitutional: Chronic fatigue, flushing, or sweats
• Dermatologic: Rashes or lesions
• Ophthalmologic: dry eyes
• Oral: Burning or itching in mouth
• Pulmonary: Airway inflammation at any/all levels
• Cardiovascular: Blood pressure lability or codiagnosis of POTS is common
• Gastrointestinal: Reflux, dysphagia, or malabsorption
• Genitourinary: Endometriosis, dysmenorrhea, or dyspareunia
• Musculoskeletal/connective tissue: Fibromyalgia or diagnosis of hypermobile EDS is common
• Neurologic: Headaches or sensory neuropathies
• Psychiatric: Depression or anxiety
• Endocrinologic: Thyroid disease or dyslipidemia
• Hematologic: Polycythemia or anemia (after ruling out other causes)

The diagnosis is made by fulfilling that major criterion, plus at least one objective assessment of pathologically increased release of MC mediators, including infiltrates, abnormal MC morphology, or MC genetic changes shown to increase MC activity. Other alternatives include evidence of above-normal levels of MC mediators, including tryptase, histamine or its metabolites, heparin, or chromatin A, in whole blood, serum, plasma, or urine. Symptomatic response to MC activation inhibitors can also be used but isn’t required as it is in the other definition. 
 

Underdiagnosis vs Overdiagnosis

Lawrence B. Afrin, MD, senior consultant in hematology/oncology at the AIM Center for Personalized Medicine, Westchester, New York, and lead author of the 2020 update of the broader “consensus-2” criteria, said in an interview, “we now know MCAS exists, and it’s prevalent, even though, for understandable and forgivable reasons, we’ve been missing it all along. ... If you see a patient who has this chronic, multisystem unwellness with general themes of inflammation plus or minus allergic issues and you can’t find some other rational explanation that better accounts for what’s going on ... then it’s reasonable to think to include MCAS in the differential diagnosis. If the patient happens not to fit the diagnostic criteria being advanced by one group, that doesn’t necessarily rule out the possibility that this is still going on.”

Afrin, along with his coauthors, faulted the narrower “consensus-1” definition for lacking data to support the “20% + 2” criteria for requiring the difficult determination of a patient’s “baseline” and for requiring evidence of response to treatment prior to making the diagnosis. Not all patients will respond to a given histamine blocker, he noted. 

But Lawrence B. Schwartz, MD, PhD, an author on both the Valent and AAAAI criteria, disagreed, noting that the narrower criteria “appear to have a high degree of specificity and sensitivity when the reaction is systemic and involves hypotension. Less severe clinical events, particularly involving the gastrointestinal or central nervous systems, do not have precise clinical or biomarker criteria for identifying mast cell involvement.” 

Added Schwartz, who is professor of medicine and chair of the Division of Rheumatology, Allergy, and Immunology and program director of Allergy and Immunology, Virginia Commonwealth University (VCU), Richmond, “when mast cell activation events occur only in the skin, we refer to it as chronic urticaria and in the airways or conjunctiva of allergic individuals as allergic asthma, rhinitis, and/or conjunctivitis. The absence of specific criteria for mast cell activation in the GI [gastrointestinal] tract or CNS [central nervous system] neither rules in mast cell involvement nor does it rule out mast cell involvement. Thus, more research is needed to find better diagnostic criteria.”

Schwartz also pointed to a recent paper reporting the use of artificial intelligence models to “quantify diagnostic precision and specificity” of “alternative” MCAS definitions. The conclusion was a “lack of specificity is pronounced in relation to multiple control criteria, raising the concern that alternative criteria could disproportionately contribute to MCAS overdiagnosis, to the exclusion of more appropriate diagnoses.”

During the meeting, Afrin acknowledged that the broader view risks overdiagnosis of MCAS. However, he also referenced Occam’s razor, the principle that the simplest explanation is probably the best one. “Which scenario is more likely? Multiple diagnoses and problems that are all independent of each other vs one diagnosis that’s biologically capable of causing most or all of the findings, ie, the simplest solution even if it’s not the most immediately obvious solution?”

He said in an interview: “Do we have any proof that MCAS is what’s underlying hypermobile Ehlers-Danlos or POTS or chronic fatigue? No, we don’t have any proof, not because anybody has done studies that have shown there to be no connection but simply because we’re so early in our awareness that the disease even exists that the necessary studies haven’t even been done yet.”

At the meeting, Afrin introduced proposals to turn the “Masterminds” group into a formal professional society and to launch a journal. He also gave an update on progress in developing a symptom assessment tool both for clinical use and to enable clinical trials of new drugs to target mast cells or their mediators. The plan is to field test the tool in 2025 and publish those results in 2026. 

Grach, Afrin, and Chang had no disclosures. Schwartz discovered tryptase and invented the Thermo Fisher tryptase assay, for which his institution (VCU) receives royalties that are shared with him. He also invented monoclonal antibodies used for detecting mast cells or basophils, for which VCU receives royalties from several companies, including Millipore, Santa Cruz, BioLegend, and Hycult Biotech, that are also shared with him. He is a paid consultant for Blueprint Medicines, Celldex Therapeutics, Invea, Third Harmonic Bio, HYCOR Biomedical, Jasper, TerSera Therapeutics, and GLG. He also serves on an AstraZeneca data safety monitoring board for a clinical trial involving benralizumab treatment of hypereosinophilic syndrome and receives royalties from UpToDate (biomarkers for anaphylaxis) and Goldman-Cecil Medicine (anaphylaxis).

A version of this article first appeared on Medscape.com.

TOPLINE:

Metformin use in adults with type 2 diabetes (T2D) is associated with a slightly lower incidence of long COVID and death within 180 days after SARS-CoV-2 infection.

METHODOLOGY:

• Previous studies have shown that metformin use before and during SARS-CoV-2 infection reduces severe COVID-19 and postacute sequelae of SARS-CoV-2 (PASC), also referred to as long COVID, in adults.
• A retrospective cohort analysis was conducted to evaluate the association between metformin use before and during SARS-CoV-2 infection and the subsequent incidence of PASC.
• Researchers used data from the National COVID Cohort Collaborative (N3C) and National Patient-Centered Clinical Research Network (PCORnet) electronic health record (EHR) databases to identify adults (age, ≥ 21 years) with T2D prescribed a diabetes medication within the past 12 months.
• Participants were categorized into those using metformin (metformin group) and those using other noninsulin diabetes medications such as sulfonylureas, dipeptidyl peptidase-4 inhibitors, or thiazolidinediones (the comparator group); those who used glucagon-like peptide 1 receptor agonists or sodium-glucose cotransporter-2 inhibitors were excluded.
• The primary outcome was the incidence of PASC or death within 180 days after SARS-CoV-2 infection, defined using International Classification of Diseases U09.9 diagnosis code and/or computable phenotype defined by a predicted probability of > 75% for PASC using a machine learning model trained on patients diagnosed using U09.9 (PASC computable phenotype).

TAKEAWAY:

• Researchers identified 51,385 and 37,947 participants from the N3C and PCORnet datasets, respectively.
• Metformin use was associated with a 21% lower risk for death or PASC using the U09.9 diagnosis code (P < .001) and a 15% lower risk using the PASC computable phenotype (P < .001) in the N3C dataset than non-metformin use.
• In the PCORnet dataset, the risk for death or PASC was 13% lower using the U09.9 diagnosis code (P = .08) with metformin use vs non-metformin use, whereas the risk did not differ significantly between the groups when using the PASC computable phenotype (P = .58).
• The incidence of PASC using the U09.9 diagnosis code for the metformin and comparator groups was similar between the two datasets (1.6% and 2.0% in N3C and 2.2 and 2.6% in PCORnet, respectively).
• However, when using the computable phenotype, the incidence rates of PASC for the metformin and comparator groups were 4.8% and 5.2% in N3C and 25.2% and 24.2% in PCORnet, respectively.

IN PRACTICE:

“The incidence of PASC was lower when defined by [International Classification of Diseases] code, compared with a computable phenotype in both databases,” the authors wrote. “This may reflect the challenges of clinical care for adults needing chronic medication management and the likelihood of those adults receiving a formal PASC diagnosis.” 

SOURCE:

The study was led by Steven G. Johnson, PhD, Institute for Health Informatics, University of Minnesota, Minneapolis. It was published online in Diabetes Care.

LIMITATIONS:

The use of EHR data had several limitations, including the inability to examine a dose-dependent relationship and the lack of information on whether medications were taken before, during, or after the acute infection. The outcome definition involved the need for a medical encounter and, thus, may not capture data on all patients experiencing symptoms of PASC. The analysis focused on the prevalent use of chronic medications, limiting the assessment of initiating metformin in those diagnosed with COVID-19.

DISCLOSURES:

The study was supported by the National Institutes of Health Agreement as part of the RECOVER research program. One author reported receiving salary support from the Center for Pharmacoepidemiology and owning stock options in various pharmaceutical and biopharmaceutical companies. Another author reported receiving grant support and consulting contracts, being involved in expert witness engagement, and owning stock options in various pharmaceutical, biopharmaceutical, diabetes management, and medical device companies.

This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication. A version of this article first appeared on Medscape.com.

TOPLINE:

Metformin use in adults with type 2 diabetes (T2D) is associated with a slightly lower incidence of long COVID and death within 180 days after SARS-CoV-2 infection.

METHODOLOGY:

• Previous studies have shown that metformin use before and during SARS-CoV-2 infection reduces severe COVID-19 and postacute sequelae of SARS-CoV-2 (PASC), also referred to as long COVID, in adults.
• A retrospective cohort analysis was conducted to evaluate the association between metformin use before and during SARS-CoV-2 infection and the subsequent incidence of PASC.
• Researchers used data from the National COVID Cohort Collaborative (N3C) and National Patient-Centered Clinical Research Network (PCORnet) electronic health record (EHR) databases to identify adults (age, ≥ 21 years) with T2D prescribed a diabetes medication within the past 12 months.
• Participants were categorized into those using metformin (metformin group) and those using other noninsulin diabetes medications such as sulfonylureas, dipeptidyl peptidase-4 inhibitors, or thiazolidinediones (the comparator group); those who used glucagon-like peptide 1 receptor agonists or sodium-glucose cotransporter-2 inhibitors were excluded.
• The primary outcome was the incidence of PASC or death within 180 days after SARS-CoV-2 infection, defined using International Classification of Diseases U09.9 diagnosis code and/or computable phenotype defined by a predicted probability of > 75% for PASC using a machine learning model trained on patients diagnosed using U09.9 (PASC computable phenotype).

TAKEAWAY:

• Researchers identified 51,385 and 37,947 participants from the N3C and PCORnet datasets, respectively.
• Metformin use was associated with a 21% lower risk for death or PASC using the U09.9 diagnosis code (P < .001) and a 15% lower risk using the PASC computable phenotype (P < .001) in the N3C dataset than non-metformin use.
• In the PCORnet dataset, the risk for death or PASC was 13% lower using the U09.9 diagnosis code (P = .08) with metformin use vs non-metformin use, whereas the risk did not differ significantly between the groups when using the PASC computable phenotype (P = .58).
• The incidence of PASC using the U09.9 diagnosis code for the metformin and comparator groups was similar between the two datasets (1.6% and 2.0% in N3C and 2.2 and 2.6% in PCORnet, respectively).
• However, when using the computable phenotype, the incidence rates of PASC for the metformin and comparator groups were 4.8% and 5.2% in N3C and 25.2% and 24.2% in PCORnet, respectively.

IN PRACTICE:

“The incidence of PASC was lower when defined by [International Classification of Diseases] code, compared with a computable phenotype in both databases,” the authors wrote. “This may reflect the challenges of clinical care for adults needing chronic medication management and the likelihood of those adults receiving a formal PASC diagnosis.” 

SOURCE:

The study was led by Steven G. Johnson, PhD, Institute for Health Informatics, University of Minnesota, Minneapolis. It was published online in Diabetes Care.

LIMITATIONS:

The use of EHR data had several limitations, including the inability to examine a dose-dependent relationship and the lack of information on whether medications were taken before, during, or after the acute infection. The outcome definition involved the need for a medical encounter and, thus, may not capture data on all patients experiencing symptoms of PASC. The analysis focused on the prevalent use of chronic medications, limiting the assessment of initiating metformin in those diagnosed with COVID-19.

DISCLOSURES:

The study was supported by the National Institutes of Health Agreement as part of the RECOVER research program. One author reported receiving salary support from the Center for Pharmacoepidemiology and owning stock options in various pharmaceutical and biopharmaceutical companies. Another author reported receiving grant support and consulting contracts, being involved in expert witness engagement, and owning stock options in various pharmaceutical, biopharmaceutical, diabetes management, and medical device companies.

This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication. A version of this article first appeared on Medscape.com.

TOPLINE:

Metformin use in adults with type 2 diabetes (T2D) is associated with a slightly lower incidence of long COVID and death within 180 days after SARS-CoV-2 infection.

METHODOLOGY:

• Previous studies have shown that metformin use before and during SARS-CoV-2 infection reduces severe COVID-19 and postacute sequelae of SARS-CoV-2 (PASC), also referred to as long COVID, in adults.
• A retrospective cohort analysis was conducted to evaluate the association between metformin use before and during SARS-CoV-2 infection and the subsequent incidence of PASC.
• Researchers used data from the National COVID Cohort Collaborative (N3C) and National Patient-Centered Clinical Research Network (PCORnet) electronic health record (EHR) databases to identify adults (age, ≥ 21 years) with T2D prescribed a diabetes medication within the past 12 months.
• Participants were categorized into those using metformin (metformin group) and those using other noninsulin diabetes medications such as sulfonylureas, dipeptidyl peptidase-4 inhibitors, or thiazolidinediones (the comparator group); those who used glucagon-like peptide 1 receptor agonists or sodium-glucose cotransporter-2 inhibitors were excluded.
• The primary outcome was the incidence of PASC or death within 180 days after SARS-CoV-2 infection, defined using International Classification of Diseases U09.9 diagnosis code and/or computable phenotype defined by a predicted probability of > 75% for PASC using a machine learning model trained on patients diagnosed using U09.9 (PASC computable phenotype).

TAKEAWAY:

• Researchers identified 51,385 and 37,947 participants from the N3C and PCORnet datasets, respectively.
• Metformin use was associated with a 21% lower risk for death or PASC using the U09.9 diagnosis code (P < .001) and a 15% lower risk using the PASC computable phenotype (P < .001) in the N3C dataset than non-metformin use.
• In the PCORnet dataset, the risk for death or PASC was 13% lower using the U09.9 diagnosis code (P = .08) with metformin use vs non-metformin use, whereas the risk did not differ significantly between the groups when using the PASC computable phenotype (P = .58).
• The incidence of PASC using the U09.9 diagnosis code for the metformin and comparator groups was similar between the two datasets (1.6% and 2.0% in N3C and 2.2 and 2.6% in PCORnet, respectively).
• However, when using the computable phenotype, the incidence rates of PASC for the metformin and comparator groups were 4.8% and 5.2% in N3C and 25.2% and 24.2% in PCORnet, respectively.

IN PRACTICE:

“The incidence of PASC was lower when defined by [International Classification of Diseases] code, compared with a computable phenotype in both databases,” the authors wrote. “This may reflect the challenges of clinical care for adults needing chronic medication management and the likelihood of those adults receiving a formal PASC diagnosis.” 

SOURCE:

The study was led by Steven G. Johnson, PhD, Institute for Health Informatics, University of Minnesota, Minneapolis. It was published online in Diabetes Care.

LIMITATIONS:

The use of EHR data had several limitations, including the inability to examine a dose-dependent relationship and the lack of information on whether medications were taken before, during, or after the acute infection. The outcome definition involved the need for a medical encounter and, thus, may not capture data on all patients experiencing symptoms of PASC. The analysis focused on the prevalent use of chronic medications, limiting the assessment of initiating metformin in those diagnosed with COVID-19.

DISCLOSURES:

The study was supported by the National Institutes of Health Agreement as part of the RECOVER research program. One author reported receiving salary support from the Center for Pharmacoepidemiology and owning stock options in various pharmaceutical and biopharmaceutical companies. Another author reported receiving grant support and consulting contracts, being involved in expert witness engagement, and owning stock options in various pharmaceutical, biopharmaceutical, diabetes management, and medical device companies.

This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication. A version of this article first appeared on Medscape.com.

I suspect that many of you have seen or read about a recent study regarding the “long COVID” enigma. The investigators surveyed the records of more than 4000 pediatric patients who had been infected and nearly 1400 who had not. The researchers then developed models in which 14 symptoms were more common in previous SARS-CoV2–infected individuals in all age groups, compared with the uninfected. There were four additional symptoms in children only and three additional symptoms in the adolescents.

Using these data, the investigators created research indices that “correlated with poor overall health and quality of life” and emphasized “neurocognitive, pain, and gastrointestinal symptoms in school-age children” and a “change or loss in smell or taste, pain, and fatigue/malaise-related symptoms in adolescents.”

So now thanks to these investigators we have research indices for characterizing PASC (post-acute sequelae of SARS-CoV-2, aka. long COVID). What should we to do with them? I’m not sure these results move us any further if our goal is finding something to help patients who believe, or have been told, that they have long COVID.

Even to a non-statistician like myself there appear to be some problems with this study. In an editorial accompanying this study, Suchitra Rao, MBBS, MSCS in the Department of Pediatrics, University of Colorado School of Medicine, Aurora, noted the study has the potential for ascertainment bias. For example, the researchers’ subject recruitment procedure resulted in a higher “proportion of neurocognitive/behavioral manifestations” may have skewed the results.

Also, some of the patient evaluations were not done at a consistent interval after the initial infection, which could result in recall bias. And, more importantly, because there were no baseline measurements to determine preinfection status, the investigators had no way of determining to what degree the patients’ underlying conditions may have reflected the quality of life scores.

Although I wouldn’t consider it a bias, I wonder if the investigators have a preconceived vision of what long COVID is going to look like once it is better understood. The fact that they undertook this project suggests that they believe the truth about the phenomenon will be discoverable using data based on collections of vague symptoms.

Or, do the researchers share my vision of long COVID that if it exists it will be something akin to the burst of Parkinson’s disease seen decades later in survivors of the 1918-1920 flu pandemic. Or, maybe it is something like post-polio syndrome, in which survivors in childhood develop atrophy and muscle weakness as they age. Do the researchers believe that COVID survivors are harboring some remnant of SARS-CoV-2 or its genome inside their bodies ticking like a time bomb ready to surface in the future? Think shingles.

I suspect that there are some folks who may or not share my ticking time bomb vision, but who, like me, wonder if there is really such a thing as long COVID – at least one in the form characterized by the work of these investigators. Unfortunately, the $1 billion the National Institutes of Health has invested in the Researching COVID to Enhance Recovery (RECOVER) initiative is not going to discover delayed sequelae until time is ready to tell us. What researchers are looking at now is a collection of patients, some who were not well to begin with but now describe a collection of vague symptoms, some of which are unique to COVID, but most are not. The loss of taste and smell being the one notable and important exception.

It is easy to understand why patients and their physicians would like to have a diagnosis like “long COVID” to at least validate their symptoms that up until now have eluded explanation or remedy. Not surprisingly, they may feel that, if researchers can’t find a cure, let’s at least have something we can lay the blame on.

A major flaw in this current attempt to characterize long COVID is the lack of a true control group. Yes, the subjects the researchers labeled as “uninfected” lived contemporaneously with the patients unfortunate enough to have acquired the virus. However, this illness was mysterious from its first appearance, continued to be more frightening as we struggled to learn more about it, and was clumsily managed in a way that turned our way of life upside down. This was particularly true for school-age children. It unmasked previously unsuspected underlying conditions and quickly acquired a poorly documented reputation for having a “long” variety.

Of course the “uninfected” also lived through these same tumultuous times. But knowing that you harbored, and may still harbor, this mysterious invader moves the infected and their families into a whole new level of concern and anxiety the rest of us who were more fortunate don’t share.

We must not ignore the fact that patients and their caregivers may receive some comfort when they have something to blame for their symptoms. However, we must shift our focus away from blame hunting, which up to this point has been fruitless. Instead, we must invest our energies into helping those struggling with long COVID find a manageable pathway toward improvement. Each patient should be treated as an individual and not part of a group with similar symptoms cobbled together with data acquired under a cloud of bias.

Dr. Wilkoff practiced primary care pediatrics in Brunswick, Maine, for nearly 40 years. He has authored several books on behavioral pediatrics, including “How to Say No to Your Toddler.” Other than a Littman stethoscope he accepted as a first-year medical student in 1966, Dr. Wilkoff reports having nothing to disclose. Email him at [email protected].

I suspect that many of you have seen or read about a recent study regarding the “long COVID” enigma. The investigators surveyed the records of more than 4000 pediatric patients who had been infected and nearly 1400 who had not. The researchers then developed models in which 14 symptoms were more common in previous SARS-CoV2–infected individuals in all age groups, compared with the uninfected. There were four additional symptoms in children only and three additional symptoms in the adolescents.

Using these data, the investigators created research indices that “correlated with poor overall health and quality of life” and emphasized “neurocognitive, pain, and gastrointestinal symptoms in school-age children” and a “change or loss in smell or taste, pain, and fatigue/malaise-related symptoms in adolescents.”

So now thanks to these investigators we have research indices for characterizing PASC (post-acute sequelae of SARS-CoV-2, aka. long COVID). What should we to do with them? I’m not sure these results move us any further if our goal is finding something to help patients who believe, or have been told, that they have long COVID.

Even to a non-statistician like myself there appear to be some problems with this study. In an editorial accompanying this study, Suchitra Rao, MBBS, MSCS in the Department of Pediatrics, University of Colorado School of Medicine, Aurora, noted the study has the potential for ascertainment bias. For example, the researchers’ subject recruitment procedure resulted in a higher “proportion of neurocognitive/behavioral manifestations” may have skewed the results.

Also, some of the patient evaluations were not done at a consistent interval after the initial infection, which could result in recall bias. And, more importantly, because there were no baseline measurements to determine preinfection status, the investigators had no way of determining to what degree the patients’ underlying conditions may have reflected the quality of life scores.

Although I wouldn’t consider it a bias, I wonder if the investigators have a preconceived vision of what long COVID is going to look like once it is better understood. The fact that they undertook this project suggests that they believe the truth about the phenomenon will be discoverable using data based on collections of vague symptoms.

Or, do the researchers share my vision of long COVID that if it exists it will be something akin to the burst of Parkinson’s disease seen decades later in survivors of the 1918-1920 flu pandemic. Or, maybe it is something like post-polio syndrome, in which survivors in childhood develop atrophy and muscle weakness as they age. Do the researchers believe that COVID survivors are harboring some remnant of SARS-CoV-2 or its genome inside their bodies ticking like a time bomb ready to surface in the future? Think shingles.

I suspect that there are some folks who may or not share my ticking time bomb vision, but who, like me, wonder if there is really such a thing as long COVID – at least one in the form characterized by the work of these investigators. Unfortunately, the $1 billion the National Institutes of Health has invested in the Researching COVID to Enhance Recovery (RECOVER) initiative is not going to discover delayed sequelae until time is ready to tell us. What researchers are looking at now is a collection of patients, some who were not well to begin with but now describe a collection of vague symptoms, some of which are unique to COVID, but most are not. The loss of taste and smell being the one notable and important exception.

It is easy to understand why patients and their physicians would like to have a diagnosis like “long COVID” to at least validate their symptoms that up until now have eluded explanation or remedy. Not surprisingly, they may feel that, if researchers can’t find a cure, let’s at least have something we can lay the blame on.

A major flaw in this current attempt to characterize long COVID is the lack of a true control group. Yes, the subjects the researchers labeled as “uninfected” lived contemporaneously with the patients unfortunate enough to have acquired the virus. However, this illness was mysterious from its first appearance, continued to be more frightening as we struggled to learn more about it, and was clumsily managed in a way that turned our way of life upside down. This was particularly true for school-age children. It unmasked previously unsuspected underlying conditions and quickly acquired a poorly documented reputation for having a “long” variety.

Of course the “uninfected” also lived through these same tumultuous times. But knowing that you harbored, and may still harbor, this mysterious invader moves the infected and their families into a whole new level of concern and anxiety the rest of us who were more fortunate don’t share.

We must not ignore the fact that patients and their caregivers may receive some comfort when they have something to blame for their symptoms. However, we must shift our focus away from blame hunting, which up to this point has been fruitless. Instead, we must invest our energies into helping those struggling with long COVID find a manageable pathway toward improvement. Each patient should be treated as an individual and not part of a group with similar symptoms cobbled together with data acquired under a cloud of bias.

Dr. Wilkoff practiced primary care pediatrics in Brunswick, Maine, for nearly 40 years. He has authored several books on behavioral pediatrics, including “How to Say No to Your Toddler.” Other than a Littman stethoscope he accepted as a first-year medical student in 1966, Dr. Wilkoff reports having nothing to disclose. Email him at [email protected].

I suspect that many of you have seen or read about a recent study regarding the “long COVID” enigma. The investigators surveyed the records of more than 4000 pediatric patients who had been infected and nearly 1400 who had not. The researchers then developed models in which 14 symptoms were more common in previous SARS-CoV2–infected individuals in all age groups, compared with the uninfected. There were four additional symptoms in children only and three additional symptoms in the adolescents.

Using these data, the investigators created research indices that “correlated with poor overall health and quality of life” and emphasized “neurocognitive, pain, and gastrointestinal symptoms in school-age children” and a “change or loss in smell or taste, pain, and fatigue/malaise-related symptoms in adolescents.”

So now thanks to these investigators we have research indices for characterizing PASC (post-acute sequelae of SARS-CoV-2, aka. long COVID). What should we to do with them? I’m not sure these results move us any further if our goal is finding something to help patients who believe, or have been told, that they have long COVID.

Even to a non-statistician like myself there appear to be some problems with this study. In an editorial accompanying this study, Suchitra Rao, MBBS, MSCS in the Department of Pediatrics, University of Colorado School of Medicine, Aurora, noted the study has the potential for ascertainment bias. For example, the researchers’ subject recruitment procedure resulted in a higher “proportion of neurocognitive/behavioral manifestations” may have skewed the results.

Also, some of the patient evaluations were not done at a consistent interval after the initial infection, which could result in recall bias. And, more importantly, because there were no baseline measurements to determine preinfection status, the investigators had no way of determining to what degree the patients’ underlying conditions may have reflected the quality of life scores.

Although I wouldn’t consider it a bias, I wonder if the investigators have a preconceived vision of what long COVID is going to look like once it is better understood. The fact that they undertook this project suggests that they believe the truth about the phenomenon will be discoverable using data based on collections of vague symptoms.

Or, do the researchers share my vision of long COVID that if it exists it will be something akin to the burst of Parkinson’s disease seen decades later in survivors of the 1918-1920 flu pandemic. Or, maybe it is something like post-polio syndrome, in which survivors in childhood develop atrophy and muscle weakness as they age. Do the researchers believe that COVID survivors are harboring some remnant of SARS-CoV-2 or its genome inside their bodies ticking like a time bomb ready to surface in the future? Think shingles.

I suspect that there are some folks who may or not share my ticking time bomb vision, but who, like me, wonder if there is really such a thing as long COVID – at least one in the form characterized by the work of these investigators. Unfortunately, the $1 billion the National Institutes of Health has invested in the Researching COVID to Enhance Recovery (RECOVER) initiative is not going to discover delayed sequelae until time is ready to tell us. What researchers are looking at now is a collection of patients, some who were not well to begin with but now describe a collection of vague symptoms, some of which are unique to COVID, but most are not. The loss of taste and smell being the one notable and important exception.

It is easy to understand why patients and their physicians would like to have a diagnosis like “long COVID” to at least validate their symptoms that up until now have eluded explanation or remedy. Not surprisingly, they may feel that, if researchers can’t find a cure, let’s at least have something we can lay the blame on.

A major flaw in this current attempt to characterize long COVID is the lack of a true control group. Yes, the subjects the researchers labeled as “uninfected” lived contemporaneously with the patients unfortunate enough to have acquired the virus. However, this illness was mysterious from its first appearance, continued to be more frightening as we struggled to learn more about it, and was clumsily managed in a way that turned our way of life upside down. This was particularly true for school-age children. It unmasked previously unsuspected underlying conditions and quickly acquired a poorly documented reputation for having a “long” variety.

Of course the “uninfected” also lived through these same tumultuous times. But knowing that you harbored, and may still harbor, this mysterious invader moves the infected and their families into a whole new level of concern and anxiety the rest of us who were more fortunate don’t share.

We must not ignore the fact that patients and their caregivers may receive some comfort when they have something to blame for their symptoms. However, we must shift our focus away from blame hunting, which up to this point has been fruitless. Instead, we must invest our energies into helping those struggling with long COVID find a manageable pathway toward improvement. Each patient should be treated as an individual and not part of a group with similar symptoms cobbled together with data acquired under a cloud of bias.

Dr. Wilkoff practiced primary care pediatrics in Brunswick, Maine, for nearly 40 years. He has authored several books on behavioral pediatrics, including “How to Say No to Your Toddler.” Other than a Littman stethoscope he accepted as a first-year medical student in 1966, Dr. Wilkoff reports having nothing to disclose. Email him at [email protected].

New research adds to a growing body of evidence suggesting that COVID-19 infection can be hard on mental health. 

The UK study of more than 18 million adults showed an elevated rate of mental illness, including depression and serious mental illness, for up to a year following a bout of COVID-19, particularly in those with severe COVID who had not been vaccinated. 

Importantly, vaccination appeared to mitigate the adverse effects of COVID-19 on mental health, the investigators found. 

“Our results highlight the importance COVID-19 vaccination in the general population and particularly among those with mental illnesses, who may be at higher risk of both SARS-CoV-2 infection and adverse outcomes following COVID-19,” first author Venexia Walker, PhD, with University of Bristol, United Kingdom, said in a news release. 

The study was published online on August 21 in JAMA Psychiatry.
 

Novel Data

“Before this study, a number of papers had looked at associations of COVID diagnosis with mental ill health, and broadly speaking, they had reported associations of different magnitudes,” study author Jonathan A. C. Sterne, PhD, with University of Bristol, noted in a journal podcast. 

“Some studies were restricted to patients who were hospitalized with COVID-19 and some not and the duration of follow-up varied. And importantly, the nature of COVID-19 changed profoundly as vaccination became available and there was little data on the impact of vaccination on associations of COVID-19 with subsequent mental ill health,” Dr. Sterne said. 

The UK study was conducted in three cohorts — a cohort of about 18.6 million people who were diagnosed with COVID-19 before a vaccine was available, a cohort of about 14 million adults who were vaccinated, and a cohort of about 3.2 million people who were unvaccinated.

The researchers compared rates of various mental illnesses after COVID-19 with rates before or without COVID-19 and by vaccination status.

Across all cohorts, rates of most mental illnesses examined were “markedly elevated” during the first month following a COVID-19 diagnosis compared with rates before or without COVID-19.

For example, the adjusted hazard ratios for depression (the most common illness) and serious mental illness in the month after COVID-19 were 1.93 and 1.49, respectively, in the prevaccination cohort and 1.79 and 1.45, respectively, in the unvaccinated cohort compared with 1.16 and 0.91 in the vaccinated cohort.

This elevation in the rate of mental illnesses was mainly seen after severe COVID-19 that led to hospitalization and remained higher for up to a year following severe COVID-19 in unvaccinated adults.

For severe COVID-19 with hospitalization, the adjusted hazard ratio for depression in the month following admission was 16.3 in the prevaccine cohort, 15.6 in the unvaccinated cohort, and 12.9 in the vaccinated cohort.

The adjusted hazard ratios for serious mental illness in the month after COVID hospitalization was 9.71 in the prevaccine cohort, 8.75 with no vaccination, and 6.52 with vaccination. 

“Incidences of other mental illnesses were broadly similar to those of depression and serious mental illness, both overall and for COVID-19 with and without hospitalization,” the authors report in their paper.

Consistent with prior research, subgroup analyzes found the association of COVID-19 and mental illness was stronger among older adults and men, with no marked differences by ethnic group.

“We should be concerned about continuing consequences in people who experienced severe COVID-19 early in the pandemic, and they may include a continuing higher incidence of mental ill health, such as depression and serious mental illness,” Dr. Sterne said in the podcast. 

In terms of ongoing booster vaccinations, “people who are advised that they are under vaccinated or recommended for further COVID-19 vaccination, should take those invitations seriously, because by preventing severe COVID-19, which is what vaccination does, you can prevent consequences such as mental illness,” Dr. Sterne added. 

The study was supported by the COVID-19 Longitudinal Health and Wellbeing National Core Study, which is funded by the Medical Research Council and National Institute for Health and Care Research. The authors had no relevant conflicts of interest.
 

A version of this article first appeared on Medscape.com.

New research adds to a growing body of evidence suggesting that COVID-19 infection can be hard on mental health. 

The UK study of more than 18 million adults showed an elevated rate of mental illness, including depression and serious mental illness, for up to a year following a bout of COVID-19, particularly in those with severe COVID who had not been vaccinated. 

Importantly, vaccination appeared to mitigate the adverse effects of COVID-19 on mental health, the investigators found. 

“Our results highlight the importance COVID-19 vaccination in the general population and particularly among those with mental illnesses, who may be at higher risk of both SARS-CoV-2 infection and adverse outcomes following COVID-19,” first author Venexia Walker, PhD, with University of Bristol, United Kingdom, said in a news release. 

The study was published online on August 21 in JAMA Psychiatry.
 

Novel Data

“Before this study, a number of papers had looked at associations of COVID diagnosis with mental ill health, and broadly speaking, they had reported associations of different magnitudes,” study author Jonathan A. C. Sterne, PhD, with University of Bristol, noted in a journal podcast. 

“Some studies were restricted to patients who were hospitalized with COVID-19 and some not and the duration of follow-up varied. And importantly, the nature of COVID-19 changed profoundly as vaccination became available and there was little data on the impact of vaccination on associations of COVID-19 with subsequent mental ill health,” Dr. Sterne said. 

The UK study was conducted in three cohorts — a cohort of about 18.6 million people who were diagnosed with COVID-19 before a vaccine was available, a cohort of about 14 million adults who were vaccinated, and a cohort of about 3.2 million people who were unvaccinated.

The researchers compared rates of various mental illnesses after COVID-19 with rates before or without COVID-19 and by vaccination status.

Across all cohorts, rates of most mental illnesses examined were “markedly elevated” during the first month following a COVID-19 diagnosis compared with rates before or without COVID-19.

For example, the adjusted hazard ratios for depression (the most common illness) and serious mental illness in the month after COVID-19 were 1.93 and 1.49, respectively, in the prevaccination cohort and 1.79 and 1.45, respectively, in the unvaccinated cohort compared with 1.16 and 0.91 in the vaccinated cohort.

This elevation in the rate of mental illnesses was mainly seen after severe COVID-19 that led to hospitalization and remained higher for up to a year following severe COVID-19 in unvaccinated adults.

For severe COVID-19 with hospitalization, the adjusted hazard ratio for depression in the month following admission was 16.3 in the prevaccine cohort, 15.6 in the unvaccinated cohort, and 12.9 in the vaccinated cohort.

The adjusted hazard ratios for serious mental illness in the month after COVID hospitalization was 9.71 in the prevaccine cohort, 8.75 with no vaccination, and 6.52 with vaccination. 

“Incidences of other mental illnesses were broadly similar to those of depression and serious mental illness, both overall and for COVID-19 with and without hospitalization,” the authors report in their paper.

Consistent with prior research, subgroup analyzes found the association of COVID-19 and mental illness was stronger among older adults and men, with no marked differences by ethnic group.

“We should be concerned about continuing consequences in people who experienced severe COVID-19 early in the pandemic, and they may include a continuing higher incidence of mental ill health, such as depression and serious mental illness,” Dr. Sterne said in the podcast. 

In terms of ongoing booster vaccinations, “people who are advised that they are under vaccinated or recommended for further COVID-19 vaccination, should take those invitations seriously, because by preventing severe COVID-19, which is what vaccination does, you can prevent consequences such as mental illness,” Dr. Sterne added. 

The study was supported by the COVID-19 Longitudinal Health and Wellbeing National Core Study, which is funded by the Medical Research Council and National Institute for Health and Care Research. The authors had no relevant conflicts of interest.
 

A version of this article first appeared on Medscape.com.

New research adds to a growing body of evidence suggesting that COVID-19 infection can be hard on mental health. 

The UK study of more than 18 million adults showed an elevated rate of mental illness, including depression and serious mental illness, for up to a year following a bout of COVID-19, particularly in those with severe COVID who had not been vaccinated. 

Importantly, vaccination appeared to mitigate the adverse effects of COVID-19 on mental health, the investigators found. 

“Our results highlight the importance COVID-19 vaccination in the general population and particularly among those with mental illnesses, who may be at higher risk of both SARS-CoV-2 infection and adverse outcomes following COVID-19,” first author Venexia Walker, PhD, with University of Bristol, United Kingdom, said in a news release. 

The study was published online on August 21 in JAMA Psychiatry.
 

Novel Data

“Before this study, a number of papers had looked at associations of COVID diagnosis with mental ill health, and broadly speaking, they had reported associations of different magnitudes,” study author Jonathan A. C. Sterne, PhD, with University of Bristol, noted in a journal podcast. 

“Some studies were restricted to patients who were hospitalized with COVID-19 and some not and the duration of follow-up varied. And importantly, the nature of COVID-19 changed profoundly as vaccination became available and there was little data on the impact of vaccination on associations of COVID-19 with subsequent mental ill health,” Dr. Sterne said. 

The UK study was conducted in three cohorts — a cohort of about 18.6 million people who were diagnosed with COVID-19 before a vaccine was available, a cohort of about 14 million adults who were vaccinated, and a cohort of about 3.2 million people who were unvaccinated.

The researchers compared rates of various mental illnesses after COVID-19 with rates before or without COVID-19 and by vaccination status.

Across all cohorts, rates of most mental illnesses examined were “markedly elevated” during the first month following a COVID-19 diagnosis compared with rates before or without COVID-19.

For example, the adjusted hazard ratios for depression (the most common illness) and serious mental illness in the month after COVID-19 were 1.93 and 1.49, respectively, in the prevaccination cohort and 1.79 and 1.45, respectively, in the unvaccinated cohort compared with 1.16 and 0.91 in the vaccinated cohort.

This elevation in the rate of mental illnesses was mainly seen after severe COVID-19 that led to hospitalization and remained higher for up to a year following severe COVID-19 in unvaccinated adults.

For severe COVID-19 with hospitalization, the adjusted hazard ratio for depression in the month following admission was 16.3 in the prevaccine cohort, 15.6 in the unvaccinated cohort, and 12.9 in the vaccinated cohort.

The adjusted hazard ratios for serious mental illness in the month after COVID hospitalization was 9.71 in the prevaccine cohort, 8.75 with no vaccination, and 6.52 with vaccination. 

“Incidences of other mental illnesses were broadly similar to those of depression and serious mental illness, both overall and for COVID-19 with and without hospitalization,” the authors report in their paper.

Consistent with prior research, subgroup analyzes found the association of COVID-19 and mental illness was stronger among older adults and men, with no marked differences by ethnic group.

“We should be concerned about continuing consequences in people who experienced severe COVID-19 early in the pandemic, and they may include a continuing higher incidence of mental ill health, such as depression and serious mental illness,” Dr. Sterne said in the podcast. 

In terms of ongoing booster vaccinations, “people who are advised that they are under vaccinated or recommended for further COVID-19 vaccination, should take those invitations seriously, because by preventing severe COVID-19, which is what vaccination does, you can prevent consequences such as mental illness,” Dr. Sterne added. 

The study was supported by the COVID-19 Longitudinal Health and Wellbeing National Core Study, which is funded by the Medical Research Council and National Institute for Health and Care Research. The authors had no relevant conflicts of interest.
 

A version of this article first appeared on Medscape.com.

Paxlovid, an antiviral approved in 2023 to treat acute infections of COVID-19, is showing great potential as a new treatment for long COVID and may be the most promising experimental therapy now being studied for treating the condition.

New research offers strong evidence that Paxlovid provides significant benefits for COVID-19 patients who are at high risk for severe or prolonged disease, particularly older adults and those who are immunocompromised, said Lisa Sanders, MD, medical director of Yale’s Long COVID Multidisciplinary Care Center, New Haven, Connecticut. 

“We all know that long COVID is a disease smorgasbord of illnesses that have been somehow triggered by COVID. So, the question is, are there some types of these disorders that can respond to Paxlovid?” Dr. Sanders said. 

Some patients have also benefited from supplements such as N-acetyl cysteine (NAC), as well as vitamins B, C, D and alpha lipoic acid, in which the risks are low and there are potential benefits, Dr. Sanders said.

As researchers continue to study new treatments for long COVID, for which there are no standard approved therapies, Dr. Sanders suggested doctors might turn to Paxlovid and other promising therapeutics that have shown benefits in preliminary study findings.

A study published in 2023 by JAMA Internal Medicine reviewed the charts of nearly 300,000 veterans with severe acute COVID infections. The study found that Paxlovid treatment reduced the likelihood of developing long COVID. But a more recent study at Stanford University, Palo Alto, California — the STOP-PASC trial— did not find Paxlovid improved symptoms when given to 155 patients who had already recovered from acute infection. Participants with long COVID symptoms — and who had on average recovered from acute infection around 16 months earlier — were given a 15-day course of Paxlovid. Common symptoms like fog, fatigue, and cardiovascular or gastrointestinal symptoms did not improve.

However, long COVID likely has multiple drivers. Viral persistence may still be at play for a subset of patients. This means that, despite the fact that patients recover from acute infection, hidden reservoirs of SARS-CoV-2 are still present in the body, possibly bringing on long COVID symptoms. Which means Paxlovid may help some long COVID patients but not others, Dr. Sanders explained. That’s why research needs to continue to identify the best cases for Paxlovid’s use and to identify other treatments for those who do not benefit from Paxlovid.

The PAX LC trial at Yale suggests there may not be a one-size-fits-all treatment for the condition, but a range of factors that may determine the best therapy for individual patients. Led by Yale School of Medicine’s Harlan Krumholz, MD, and Akiko Iwasaki, PhD, the study tested the effects of Paxlovid overall and was designed to determine who is most likely to benefit from antiviral treatment and gain further understanding of the immune response in long COVID. Results should be reported soon. 

“This acknowledges one line of thinking that long COVID is caused by viral persistence,” Dr. Sanders said. “Do these people have hidden reservoirs of the virus? The question is, are there people who seem to respond [to Paxlovid]? And if so, what characterizes these people?”
 

Low-Risk, High-Reward Supplements

Some of Dr. Sanders’ colleagues at Yale are focusing on long COVID’s neurological symptoms and neuropathogenesis. There’s evidence showing these symptoms — notably brain fog — can be treated with supplements. 

In 2022, a Yale study by Arman Fesharaki-Zadeh, MD, PhD, found promise in treating brain fog through a combination supplement of NAC and guanfacine — the latter developed by Yale neuroscientist, Amy Arnsten, PhD. 

The two published their study in Neuroimmunology Reports in November 2023. NAC is available over the counter and patients can get a prescription for guanfacine off label from their physician. Guanfacine is approved to treat high blood pressure by decreasing heart rate and relaxing blood vessels. But it’s also been shown to treat attention-deficit/hyperactivity disorder (ADHD) and other cognitive issues. 

Though NAC can treat respiratory problems, it’s also commonly used to treat postconcussion symptoms. Dr. Fesharaki-Zadeh found that it helps treat brain fog, increases energy, and improves memory. When paired with guanfacine, substantial benefits were reported, such as better multitasking abilities and markedly improved organizational skills. 

Dr. Sanders is now using NAC and guanfacine for patients in her clinic. 
 

‘Mitochondrial Enhancement’ Through Vitamins

Dr. Sanders has also used a combination of alpha lipoic acid and vitamin C, and a combo of B vitamins that make up what’s called a “mitochondrial enhancement regimen.”

To treat a very common symptom like fatigue, Dr. Sanders prefers supplement combinations over other drugs like Modafinil or Adderall. 

Modafinil is a central nervous system stimulant used to reduce extreme sleepiness caused by narcolepsy or other sleep disorders. Adderall is an amphetamine also used to treat narcolepsy as well as ADHD. Both work on your sleep and alertness, but long COVID affects the whole body, causing a physical fatigue similar to postexertional malaise (PEM) that isn’t remedied by those kinds of drugs, as studies suggest what’s involved in PEM is mitochondria, Dr. Sanders said. 

PEM is a worsening of symptoms that occurs after minimal physical or mental exertion. These are activities that should be well tolerated, but PEM causes extreme fatigue and flu-like symptoms. It’s become a hallmark symptom of long COVID after having already been a key diagnostic factor in myalgic encephalomyelitis/chronic fatigue syndrome.

As Dr. Sanders noted in her long COVID blog, which tracks the latest research and treatment options for doctors who treat long COVID patients, previous studies have shown low vitamin D levels may not only increase the risk for severe COVID-19 but delay recovery from long COVID. Those without long COVID had higher levels of vitamin D, compared with long COVID patients. Vitamin D is known to boost the immune system.

Dr. Sanders found that those with vitamin D deficiencies are most likely to benefit from this approach. For people who don’t have sufficient sun exposure, which prompts the production of vitamin D, she says supplementation with 1000 IUs of vitamin D3 daily is enough for most adults.

Research is also currently being underway on the use of the diabetes drug metformin in people with acute COVID infections to determine if it may reduce the likelihood of developing long COVID. In a recent long COVID clinical trial, early outpatient COVID-19 treatment with metformin decreased the subsequent risk for long COVID by 41.3% during 10-month follow-up. 
 

Other New Treatments Under Study

Dr. Sanders believes the foundation for many of long COVID’s symptoms could be neurological. 

“I think that long COVID is probably a neurologic disorder,” Dr. Sanders said. 

Lindsey McAlpine, MD, director of the Yale Medicine NeuroCovid Clinic, is focusing on neuropsychiatric long COVID and the causes of neurologic post-acute sequelae of SARS-CoV-2 infection (neuro-PASC). Symptoms of neuro-PASC include cognitive impairment, headaches, and dizziness.

“Lindsey is trying to see which parts of the brain are involved and see if there are phenotypes of brain abnormalities that match up with clinical abnormalities,” Dr. Sanders said.

The National Institute of Neurological Disorders and Stroke recently awarded her a 5-year K23 grant to support her ongoing study, “Magnetic Resonance Imaging Biomarkers of Post-COVID-19 Cerebral Microvascular Dysfunction.”

Utilizing advanced MRI techniques to identify microvascular dysfunction biomarkers in the brain, Dr. McAlpine hopes to unearth and better understand the pathophysiology behind neurological issues post COVID.

Many of Dr. McAlpine’s patients with cognitive symptoms have responded well to NAC and guanfacine. 

Still, the hope is that her brain-imaging studies will bear fruit that leads to a better understanding of long COVID and new treatment methods.

A version of this article first appeared on Medscape.com.

Paxlovid, an antiviral approved in 2023 to treat acute infections of COVID-19, is showing great potential as a new treatment for long COVID and may be the most promising experimental therapy now being studied for treating the condition.

New research offers strong evidence that Paxlovid provides significant benefits for COVID-19 patients who are at high risk for severe or prolonged disease, particularly older adults and those who are immunocompromised, said Lisa Sanders, MD, medical director of Yale’s Long COVID Multidisciplinary Care Center, New Haven, Connecticut. 

“We all know that long COVID is a disease smorgasbord of illnesses that have been somehow triggered by COVID. So, the question is, are there some types of these disorders that can respond to Paxlovid?” Dr. Sanders said. 

Some patients have also benefited from supplements such as N-acetyl cysteine (NAC), as well as vitamins B, C, D and alpha lipoic acid, in which the risks are low and there are potential benefits, Dr. Sanders said.

As researchers continue to study new treatments for long COVID, for which there are no standard approved therapies, Dr. Sanders suggested doctors might turn to Paxlovid and other promising therapeutics that have shown benefits in preliminary study findings.

A study published in 2023 by JAMA Internal Medicine reviewed the charts of nearly 300,000 veterans with severe acute COVID infections. The study found that Paxlovid treatment reduced the likelihood of developing long COVID. But a more recent study at Stanford University, Palo Alto, California — the STOP-PASC trial— did not find Paxlovid improved symptoms when given to 155 patients who had already recovered from acute infection. Participants with long COVID symptoms — and who had on average recovered from acute infection around 16 months earlier — were given a 15-day course of Paxlovid. Common symptoms like fog, fatigue, and cardiovascular or gastrointestinal symptoms did not improve.

However, long COVID likely has multiple drivers. Viral persistence may still be at play for a subset of patients. This means that, despite the fact that patients recover from acute infection, hidden reservoirs of SARS-CoV-2 are still present in the body, possibly bringing on long COVID symptoms. Which means Paxlovid may help some long COVID patients but not others, Dr. Sanders explained. That’s why research needs to continue to identify the best cases for Paxlovid’s use and to identify other treatments for those who do not benefit from Paxlovid.

The PAX LC trial at Yale suggests there may not be a one-size-fits-all treatment for the condition, but a range of factors that may determine the best therapy for individual patients. Led by Yale School of Medicine’s Harlan Krumholz, MD, and Akiko Iwasaki, PhD, the study tested the effects of Paxlovid overall and was designed to determine who is most likely to benefit from antiviral treatment and gain further understanding of the immune response in long COVID. Results should be reported soon. 

“This acknowledges one line of thinking that long COVID is caused by viral persistence,” Dr. Sanders said. “Do these people have hidden reservoirs of the virus? The question is, are there people who seem to respond [to Paxlovid]? And if so, what characterizes these people?”
 

Low-Risk, High-Reward Supplements

Some of Dr. Sanders’ colleagues at Yale are focusing on long COVID’s neurological symptoms and neuropathogenesis. There’s evidence showing these symptoms — notably brain fog — can be treated with supplements. 

In 2022, a Yale study by Arman Fesharaki-Zadeh, MD, PhD, found promise in treating brain fog through a combination supplement of NAC and guanfacine — the latter developed by Yale neuroscientist, Amy Arnsten, PhD. 

The two published their study in Neuroimmunology Reports in November 2023. NAC is available over the counter and patients can get a prescription for guanfacine off label from their physician. Guanfacine is approved to treat high blood pressure by decreasing heart rate and relaxing blood vessels. But it’s also been shown to treat attention-deficit/hyperactivity disorder (ADHD) and other cognitive issues. 

Though NAC can treat respiratory problems, it’s also commonly used to treat postconcussion symptoms. Dr. Fesharaki-Zadeh found that it helps treat brain fog, increases energy, and improves memory. When paired with guanfacine, substantial benefits were reported, such as better multitasking abilities and markedly improved organizational skills. 

Dr. Sanders is now using NAC and guanfacine for patients in her clinic. 
 

‘Mitochondrial Enhancement’ Through Vitamins

Dr. Sanders has also used a combination of alpha lipoic acid and vitamin C, and a combo of B vitamins that make up what’s called a “mitochondrial enhancement regimen.”

To treat a very common symptom like fatigue, Dr. Sanders prefers supplement combinations over other drugs like Modafinil or Adderall. 

Modafinil is a central nervous system stimulant used to reduce extreme sleepiness caused by narcolepsy or other sleep disorders. Adderall is an amphetamine also used to treat narcolepsy as well as ADHD. Both work on your sleep and alertness, but long COVID affects the whole body, causing a physical fatigue similar to postexertional malaise (PEM) that isn’t remedied by those kinds of drugs, as studies suggest what’s involved in PEM is mitochondria, Dr. Sanders said. 

PEM is a worsening of symptoms that occurs after minimal physical or mental exertion. These are activities that should be well tolerated, but PEM causes extreme fatigue and flu-like symptoms. It’s become a hallmark symptom of long COVID after having already been a key diagnostic factor in myalgic encephalomyelitis/chronic fatigue syndrome.

As Dr. Sanders noted in her long COVID blog, which tracks the latest research and treatment options for doctors who treat long COVID patients, previous studies have shown low vitamin D levels may not only increase the risk for severe COVID-19 but delay recovery from long COVID. Those without long COVID had higher levels of vitamin D, compared with long COVID patients. Vitamin D is known to boost the immune system.

Dr. Sanders found that those with vitamin D deficiencies are most likely to benefit from this approach. For people who don’t have sufficient sun exposure, which prompts the production of vitamin D, she says supplementation with 1000 IUs of vitamin D3 daily is enough for most adults.

Research is also currently being underway on the use of the diabetes drug metformin in people with acute COVID infections to determine if it may reduce the likelihood of developing long COVID. In a recent long COVID clinical trial, early outpatient COVID-19 treatment with metformin decreased the subsequent risk for long COVID by 41.3% during 10-month follow-up. 
 

Other New Treatments Under Study

Dr. Sanders believes the foundation for many of long COVID’s symptoms could be neurological. 

“I think that long COVID is probably a neurologic disorder,” Dr. Sanders said. 

Lindsey McAlpine, MD, director of the Yale Medicine NeuroCovid Clinic, is focusing on neuropsychiatric long COVID and the causes of neurologic post-acute sequelae of SARS-CoV-2 infection (neuro-PASC). Symptoms of neuro-PASC include cognitive impairment, headaches, and dizziness.

“Lindsey is trying to see which parts of the brain are involved and see if there are phenotypes of brain abnormalities that match up with clinical abnormalities,” Dr. Sanders said.

The National Institute of Neurological Disorders and Stroke recently awarded her a 5-year K23 grant to support her ongoing study, “Magnetic Resonance Imaging Biomarkers of Post-COVID-19 Cerebral Microvascular Dysfunction.”

Utilizing advanced MRI techniques to identify microvascular dysfunction biomarkers in the brain, Dr. McAlpine hopes to unearth and better understand the pathophysiology behind neurological issues post COVID.

Many of Dr. McAlpine’s patients with cognitive symptoms have responded well to NAC and guanfacine. 

Still, the hope is that her brain-imaging studies will bear fruit that leads to a better understanding of long COVID and new treatment methods.

A version of this article first appeared on Medscape.com.

Paxlovid, an antiviral approved in 2023 to treat acute infections of COVID-19, is showing great potential as a new treatment for long COVID and may be the most promising experimental therapy now being studied for treating the condition.

New research offers strong evidence that Paxlovid provides significant benefits for COVID-19 patients who are at high risk for severe or prolonged disease, particularly older adults and those who are immunocompromised, said Lisa Sanders, MD, medical director of Yale’s Long COVID Multidisciplinary Care Center, New Haven, Connecticut. 

“We all know that long COVID is a disease smorgasbord of illnesses that have been somehow triggered by COVID. So, the question is, are there some types of these disorders that can respond to Paxlovid?” Dr. Sanders said. 

Some patients have also benefited from supplements such as N-acetyl cysteine (NAC), as well as vitamins B, C, D and alpha lipoic acid, in which the risks are low and there are potential benefits, Dr. Sanders said.

As researchers continue to study new treatments for long COVID, for which there are no standard approved therapies, Dr. Sanders suggested doctors might turn to Paxlovid and other promising therapeutics that have shown benefits in preliminary study findings.

A study published in 2023 by JAMA Internal Medicine reviewed the charts of nearly 300,000 veterans with severe acute COVID infections. The study found that Paxlovid treatment reduced the likelihood of developing long COVID. But a more recent study at Stanford University, Palo Alto, California — the STOP-PASC trial— did not find Paxlovid improved symptoms when given to 155 patients who had already recovered from acute infection. Participants with long COVID symptoms — and who had on average recovered from acute infection around 16 months earlier — were given a 15-day course of Paxlovid. Common symptoms like fog, fatigue, and cardiovascular or gastrointestinal symptoms did not improve.

However, long COVID likely has multiple drivers. Viral persistence may still be at play for a subset of patients. This means that, despite the fact that patients recover from acute infection, hidden reservoirs of SARS-CoV-2 are still present in the body, possibly bringing on long COVID symptoms. Which means Paxlovid may help some long COVID patients but not others, Dr. Sanders explained. That’s why research needs to continue to identify the best cases for Paxlovid’s use and to identify other treatments for those who do not benefit from Paxlovid.

The PAX LC trial at Yale suggests there may not be a one-size-fits-all treatment for the condition, but a range of factors that may determine the best therapy for individual patients. Led by Yale School of Medicine’s Harlan Krumholz, MD, and Akiko Iwasaki, PhD, the study tested the effects of Paxlovid overall and was designed to determine who is most likely to benefit from antiviral treatment and gain further understanding of the immune response in long COVID. Results should be reported soon. 

“This acknowledges one line of thinking that long COVID is caused by viral persistence,” Dr. Sanders said. “Do these people have hidden reservoirs of the virus? The question is, are there people who seem to respond [to Paxlovid]? And if so, what characterizes these people?”
 

Low-Risk, High-Reward Supplements

Some of Dr. Sanders’ colleagues at Yale are focusing on long COVID’s neurological symptoms and neuropathogenesis. There’s evidence showing these symptoms — notably brain fog — can be treated with supplements. 

In 2022, a Yale study by Arman Fesharaki-Zadeh, MD, PhD, found promise in treating brain fog through a combination supplement of NAC and guanfacine — the latter developed by Yale neuroscientist, Amy Arnsten, PhD. 

The two published their study in Neuroimmunology Reports in November 2023. NAC is available over the counter and patients can get a prescription for guanfacine off label from their physician. Guanfacine is approved to treat high blood pressure by decreasing heart rate and relaxing blood vessels. But it’s also been shown to treat attention-deficit/hyperactivity disorder (ADHD) and other cognitive issues. 

Though NAC can treat respiratory problems, it’s also commonly used to treat postconcussion symptoms. Dr. Fesharaki-Zadeh found that it helps treat brain fog, increases energy, and improves memory. When paired with guanfacine, substantial benefits were reported, such as better multitasking abilities and markedly improved organizational skills. 

Dr. Sanders is now using NAC and guanfacine for patients in her clinic. 
 

‘Mitochondrial Enhancement’ Through Vitamins

Dr. Sanders has also used a combination of alpha lipoic acid and vitamin C, and a combo of B vitamins that make up what’s called a “mitochondrial enhancement regimen.”

To treat a very common symptom like fatigue, Dr. Sanders prefers supplement combinations over other drugs like Modafinil or Adderall. 

Modafinil is a central nervous system stimulant used to reduce extreme sleepiness caused by narcolepsy or other sleep disorders. Adderall is an amphetamine also used to treat narcolepsy as well as ADHD. Both work on your sleep and alertness, but long COVID affects the whole body, causing a physical fatigue similar to postexertional malaise (PEM) that isn’t remedied by those kinds of drugs, as studies suggest what’s involved in PEM is mitochondria, Dr. Sanders said. 

PEM is a worsening of symptoms that occurs after minimal physical or mental exertion. These are activities that should be well tolerated, but PEM causes extreme fatigue and flu-like symptoms. It’s become a hallmark symptom of long COVID after having already been a key diagnostic factor in myalgic encephalomyelitis/chronic fatigue syndrome.

As Dr. Sanders noted in her long COVID blog, which tracks the latest research and treatment options for doctors who treat long COVID patients, previous studies have shown low vitamin D levels may not only increase the risk for severe COVID-19 but delay recovery from long COVID. Those without long COVID had higher levels of vitamin D, compared with long COVID patients. Vitamin D is known to boost the immune system.

Dr. Sanders found that those with vitamin D deficiencies are most likely to benefit from this approach. For people who don’t have sufficient sun exposure, which prompts the production of vitamin D, she says supplementation with 1000 IUs of vitamin D3 daily is enough for most adults.

Research is also currently being underway on the use of the diabetes drug metformin in people with acute COVID infections to determine if it may reduce the likelihood of developing long COVID. In a recent long COVID clinical trial, early outpatient COVID-19 treatment with metformin decreased the subsequent risk for long COVID by 41.3% during 10-month follow-up. 
 

Other New Treatments Under Study

Dr. Sanders believes the foundation for many of long COVID’s symptoms could be neurological. 

“I think that long COVID is probably a neurologic disorder,” Dr. Sanders said. 

Lindsey McAlpine, MD, director of the Yale Medicine NeuroCovid Clinic, is focusing on neuropsychiatric long COVID and the causes of neurologic post-acute sequelae of SARS-CoV-2 infection (neuro-PASC). Symptoms of neuro-PASC include cognitive impairment, headaches, and dizziness.

“Lindsey is trying to see which parts of the brain are involved and see if there are phenotypes of brain abnormalities that match up with clinical abnormalities,” Dr. Sanders said.

The National Institute of Neurological Disorders and Stroke recently awarded her a 5-year K23 grant to support her ongoing study, “Magnetic Resonance Imaging Biomarkers of Post-COVID-19 Cerebral Microvascular Dysfunction.”

Utilizing advanced MRI techniques to identify microvascular dysfunction biomarkers in the brain, Dr. McAlpine hopes to unearth and better understand the pathophysiology behind neurological issues post COVID.

Many of Dr. McAlpine’s patients with cognitive symptoms have responded well to NAC and guanfacine. 

Still, the hope is that her brain-imaging studies will bear fruit that leads to a better understanding of long COVID and new treatment methods.

A version of this article first appeared on Medscape.com.

Individuals with preexisting sleep disturbances including obstructive sleep apnea (OSA), insomnia, and abnormal sleep duration showed significantly increased vulnerability to COVID-19, as well as an increased risk for hospitalization, mortality, and long COVID, according to new data from more than 8 million individuals.

Sleep disturbances, though common in the general population, are generally overlooked as a risk factor for COVID-19, wrote Jiawei Zhou, MD, of The First Hospital of China Medical University, Shenyang, China, and colleagues. Most previous research has focused on the impact of COVID-19 on sleep disturbances, not the impact of sleep disturbances on COVID-19, and most studies on the latter topic have focused only on OSA, the researchers wrote.

In a meta-analysis published in eClinicalMedicine, part of The Lancet Discovery Science, the researchers identified 48 observational studies published between October 27, 2023, and May 8, 2024, that involved COVID-19 and sleep disturbances including OSA, insomnia, abnormal sleep duration, and night shift work, among others. The study population included 8,664,026 adults.

The primary outcomes were COVID-19 susceptibility, hospitalization, mortality, and long COVID. Overall, the presence of preexisting sleep disturbances was associated with a significantly increased risk for each of these outcomes, with odds ratios (ORs) of 1.12, 1.25, 1.45, and 1.36, respectively.

In subgroup analyses, the association between preexisting sleep disturbances and greater susceptibility and hospitalization was higher in younger adults (younger than 60 years) than in older adults (aged 60 years and older), but the risk for death was lower in younger adults with sleep disturbances than in older adults with sleep disturbances (OR, 1.22 vs OR, 2.07, respectively). Men with sleep disturbances had a higher risk for COVID-19 mortality than women with sleep disturbances.

Preexisting sleep disturbances overall were significantly associated with long COVID and more so in a subgroup analysis of patients whose definition of long COVID was symptoms lasting 3 or more months vs those lasting 1 month (P = .029).

When the researchers broke down associations with COVID-19 outcomes and specific sleep disturbances, they found significant associations between OSA and all four primary outcomes. Abnormal sleep duration was associated with an increased risk for COVID-19 susceptibility, hospitalization, and long COVID. Night shift work was associated with an increased risk for COVID-19 susceptibility and hospitalization, and insomnia was associated with an increased risk for long COVID.

Although the exact mechanism behind the associations between preexisting sleep disturbances and COVID-19 outcomes is uncertain, persistent sleep deprivation could set the stage in various ways, including the promotion of elevated C-reactive protein and interleukin-6 levels, the researchers wrote.

“Overall, the compromised innate and adaptive immune functions combined with a persistent inflammatory state may explain the higher risk of susceptibility, severity, and longer recovery time observed in patients with sleep disturbances. Fortunately, early intervention for sleep disturbances could attenuate the adverse effects of COVID-19,” they noted in their discussion.

The findings were limited by several factors including the observational nature of the studies and the heterogeneity of outcomes, the researchers wrote. Looking ahead, randomized, controlled trials are needed to examine the effect of interventions for sleep disturbances in the prevention and course of COVID-19, they said.

However, the study is the first known to examine multiple types of sleep disturbances and their possible influences on the full clinical course of COVID-19 and support the need for early evaluation and intervention for individuals with sleep disturbances to reduce short-term and long-term effects of the disease, the researchers concluded.
 

Findings Reflect the Need to Address Sleep Issues Early

Although the results of the current study were not surprising, “it is always worth doing meta-analyses to see if there is a potential signal in the published data to suggest a need for a new study,” Arun Chatterjee, MD, professor of pulmonary, critical care, allergy, and immunologic diseases at Wake Forest University, Winston-Salem, North Carolina, said in an interview.

“Lack of sleep, whether acute active deprivation (zero sleep for one night) or subacute/chronic sleep debt, such as only 5 hours per night, has been demonstrated to affect lymphocyte proliferation, reduce immune globulin levels, increase inflammatory markers, shorten telomeres, and affect the immune system in various ways,” said Dr. Chatterjee, who was not involved in the meta-analysis.

The clinical takeaway from the current meta-analysis is that adequate sleep is important for various reasons, Dr. Chatterjee said. “Sleep disruption affects health across a spectrum of systems; adding an annual sleep wellness and screening event to healthcare visits is probably worth the investment,” he noted.

Much more is needed in the way of additional research, Dr. Chatterjee told this news organization. Notably, studies are needed to examine what sleep disruption does to immune status, as well as all other physiologic and mental health systems, he said.

The study was supported by the National Natural Science Foundation of China and the Key Laboratory of Respiratory Diseases of Liaoning Province. The researchers had no financial conflicts to disclose. Chatterjee had no financial conflicts to disclose.
 

A version of this article appeared on Medscape.com.

Individuals with preexisting sleep disturbances including obstructive sleep apnea (OSA), insomnia, and abnormal sleep duration showed significantly increased vulnerability to COVID-19, as well as an increased risk for hospitalization, mortality, and long COVID, according to new data from more than 8 million individuals.

Sleep disturbances, though common in the general population, are generally overlooked as a risk factor for COVID-19, wrote Jiawei Zhou, MD, of The First Hospital of China Medical University, Shenyang, China, and colleagues. Most previous research has focused on the impact of COVID-19 on sleep disturbances, not the impact of sleep disturbances on COVID-19, and most studies on the latter topic have focused only on OSA, the researchers wrote.

In a meta-analysis published in eClinicalMedicine, part of The Lancet Discovery Science, the researchers identified 48 observational studies published between October 27, 2023, and May 8, 2024, that involved COVID-19 and sleep disturbances including OSA, insomnia, abnormal sleep duration, and night shift work, among others. The study population included 8,664,026 adults.

The primary outcomes were COVID-19 susceptibility, hospitalization, mortality, and long COVID. Overall, the presence of preexisting sleep disturbances was associated with a significantly increased risk for each of these outcomes, with odds ratios (ORs) of 1.12, 1.25, 1.45, and 1.36, respectively.

In subgroup analyses, the association between preexisting sleep disturbances and greater susceptibility and hospitalization was higher in younger adults (younger than 60 years) than in older adults (aged 60 years and older), but the risk for death was lower in younger adults with sleep disturbances than in older adults with sleep disturbances (OR, 1.22 vs OR, 2.07, respectively). Men with sleep disturbances had a higher risk for COVID-19 mortality than women with sleep disturbances.

Preexisting sleep disturbances overall were significantly associated with long COVID and more so in a subgroup analysis of patients whose definition of long COVID was symptoms lasting 3 or more months vs those lasting 1 month (P = .029).

When the researchers broke down associations with COVID-19 outcomes and specific sleep disturbances, they found significant associations between OSA and all four primary outcomes. Abnormal sleep duration was associated with an increased risk for COVID-19 susceptibility, hospitalization, and long COVID. Night shift work was associated with an increased risk for COVID-19 susceptibility and hospitalization, and insomnia was associated with an increased risk for long COVID.

Although the exact mechanism behind the associations between preexisting sleep disturbances and COVID-19 outcomes is uncertain, persistent sleep deprivation could set the stage in various ways, including the promotion of elevated C-reactive protein and interleukin-6 levels, the researchers wrote.

“Overall, the compromised innate and adaptive immune functions combined with a persistent inflammatory state may explain the higher risk of susceptibility, severity, and longer recovery time observed in patients with sleep disturbances. Fortunately, early intervention for sleep disturbances could attenuate the adverse effects of COVID-19,” they noted in their discussion.

The findings were limited by several factors including the observational nature of the studies and the heterogeneity of outcomes, the researchers wrote. Looking ahead, randomized, controlled trials are needed to examine the effect of interventions for sleep disturbances in the prevention and course of COVID-19, they said.

However, the study is the first known to examine multiple types of sleep disturbances and their possible influences on the full clinical course of COVID-19 and support the need for early evaluation and intervention for individuals with sleep disturbances to reduce short-term and long-term effects of the disease, the researchers concluded.
 

Findings Reflect the Need to Address Sleep Issues Early

Although the results of the current study were not surprising, “it is always worth doing meta-analyses to see if there is a potential signal in the published data to suggest a need for a new study,” Arun Chatterjee, MD, professor of pulmonary, critical care, allergy, and immunologic diseases at Wake Forest University, Winston-Salem, North Carolina, said in an interview.

“Lack of sleep, whether acute active deprivation (zero sleep for one night) or subacute/chronic sleep debt, such as only 5 hours per night, has been demonstrated to affect lymphocyte proliferation, reduce immune globulin levels, increase inflammatory markers, shorten telomeres, and affect the immune system in various ways,” said Dr. Chatterjee, who was not involved in the meta-analysis.

The clinical takeaway from the current meta-analysis is that adequate sleep is important for various reasons, Dr. Chatterjee said. “Sleep disruption affects health across a spectrum of systems; adding an annual sleep wellness and screening event to healthcare visits is probably worth the investment,” he noted.

Much more is needed in the way of additional research, Dr. Chatterjee told this news organization. Notably, studies are needed to examine what sleep disruption does to immune status, as well as all other physiologic and mental health systems, he said.

The study was supported by the National Natural Science Foundation of China and the Key Laboratory of Respiratory Diseases of Liaoning Province. The researchers had no financial conflicts to disclose. Chatterjee had no financial conflicts to disclose.
 

A version of this article appeared on Medscape.com.

Individuals with preexisting sleep disturbances including obstructive sleep apnea (OSA), insomnia, and abnormal sleep duration showed significantly increased vulnerability to COVID-19, as well as an increased risk for hospitalization, mortality, and long COVID, according to new data from more than 8 million individuals.

Sleep disturbances, though common in the general population, are generally overlooked as a risk factor for COVID-19, wrote Jiawei Zhou, MD, of The First Hospital of China Medical University, Shenyang, China, and colleagues. Most previous research has focused on the impact of COVID-19 on sleep disturbances, not the impact of sleep disturbances on COVID-19, and most studies on the latter topic have focused only on OSA, the researchers wrote.

In a meta-analysis published in eClinicalMedicine, part of The Lancet Discovery Science, the researchers identified 48 observational studies published between October 27, 2023, and May 8, 2024, that involved COVID-19 and sleep disturbances including OSA, insomnia, abnormal sleep duration, and night shift work, among others. The study population included 8,664,026 adults.

The primary outcomes were COVID-19 susceptibility, hospitalization, mortality, and long COVID. Overall, the presence of preexisting sleep disturbances was associated with a significantly increased risk for each of these outcomes, with odds ratios (ORs) of 1.12, 1.25, 1.45, and 1.36, respectively.

In subgroup analyses, the association between preexisting sleep disturbances and greater susceptibility and hospitalization was higher in younger adults (younger than 60 years) than in older adults (aged 60 years and older), but the risk for death was lower in younger adults with sleep disturbances than in older adults with sleep disturbances (OR, 1.22 vs OR, 2.07, respectively). Men with sleep disturbances had a higher risk for COVID-19 mortality than women with sleep disturbances.

Preexisting sleep disturbances overall were significantly associated with long COVID and more so in a subgroup analysis of patients whose definition of long COVID was symptoms lasting 3 or more months vs those lasting 1 month (P = .029).

When the researchers broke down associations with COVID-19 outcomes and specific sleep disturbances, they found significant associations between OSA and all four primary outcomes. Abnormal sleep duration was associated with an increased risk for COVID-19 susceptibility, hospitalization, and long COVID. Night shift work was associated with an increased risk for COVID-19 susceptibility and hospitalization, and insomnia was associated with an increased risk for long COVID.

Although the exact mechanism behind the associations between preexisting sleep disturbances and COVID-19 outcomes is uncertain, persistent sleep deprivation could set the stage in various ways, including the promotion of elevated C-reactive protein and interleukin-6 levels, the researchers wrote.

“Overall, the compromised innate and adaptive immune functions combined with a persistent inflammatory state may explain the higher risk of susceptibility, severity, and longer recovery time observed in patients with sleep disturbances. Fortunately, early intervention for sleep disturbances could attenuate the adverse effects of COVID-19,” they noted in their discussion.

The findings were limited by several factors including the observational nature of the studies and the heterogeneity of outcomes, the researchers wrote. Looking ahead, randomized, controlled trials are needed to examine the effect of interventions for sleep disturbances in the prevention and course of COVID-19, they said.

However, the study is the first known to examine multiple types of sleep disturbances and their possible influences on the full clinical course of COVID-19 and support the need for early evaluation and intervention for individuals with sleep disturbances to reduce short-term and long-term effects of the disease, the researchers concluded.
 

Findings Reflect the Need to Address Sleep Issues Early

Although the results of the current study were not surprising, “it is always worth doing meta-analyses to see if there is a potential signal in the published data to suggest a need for a new study,” Arun Chatterjee, MD, professor of pulmonary, critical care, allergy, and immunologic diseases at Wake Forest University, Winston-Salem, North Carolina, said in an interview.

“Lack of sleep, whether acute active deprivation (zero sleep for one night) or subacute/chronic sleep debt, such as only 5 hours per night, has been demonstrated to affect lymphocyte proliferation, reduce immune globulin levels, increase inflammatory markers, shorten telomeres, and affect the immune system in various ways,” said Dr. Chatterjee, who was not involved in the meta-analysis.

The clinical takeaway from the current meta-analysis is that adequate sleep is important for various reasons, Dr. Chatterjee said. “Sleep disruption affects health across a spectrum of systems; adding an annual sleep wellness and screening event to healthcare visits is probably worth the investment,” he noted.

Much more is needed in the way of additional research, Dr. Chatterjee told this news organization. Notably, studies are needed to examine what sleep disruption does to immune status, as well as all other physiologic and mental health systems, he said.

The study was supported by the National Natural Science Foundation of China and the Key Laboratory of Respiratory Diseases of Liaoning Province. The researchers had no financial conflicts to disclose. Chatterjee had no financial conflicts to disclose.
 

A version of this article appeared on Medscape.com.

Neurologic symptoms of long COVID are vast, common, hard to treat, disabling, and can mimic dozens of other syndromes, with some symptoms as serious as those seen in myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) and postural orthostatic tachycardia syndrome (POTS).

Now, recent evidence has suggested long COVID is primarily an autonomic nervous system disorder.

Patients with long COVID increasingly complain of extreme fatigue, brain fog, cognitive issues, dizziness, irregular heart rhythms, and high or low blood pressure, all features seen with dysautonomia — dysregulation of the autonomic nervous system.

Their lives may never be the same.

Lindsay S. McAlpine, MD, a specialist in the neurologic sequelae of COVID-19 at the Yale School of Medicine and director of the Yale NeuroCOVID Clinic, New Haven, Connecticut, treats patients who struggle with neurologic symptoms even after disease recovery.

“Some people have the brain fog and the shortness of breath; some have the palpitations and the headaches ... it’s kind of a mix and match,” she said.

Dr. McAlpine’s research has been slowly building up into what could bring about a significant breakthrough in treating some of the most misunderstood and difficult-to-treat symptoms of long COVID.
 

The Effect of Vascular Inflammation on Long COVID

The National Institute of Neurological Disorders and Stroke recently awarded her a 5-year K23 grant to support her ongoing study, “Magnetic Resonance Imaging Biomarkers of Post-COVID-19 Cerebral Microvascular Dysfunction.”

Using advanced MRI techniques to identify microvascular dysfunction biomarkers in the brain, McAlpine hopes to unearth and better understand the pathophysiology behind neurologic issues post-COVID.

Dr. McAlpine said, “What we’re seeing is that there’s a unique signature of vascular inflammation in long COVID that is distinct from acute COVID. And it has to do with endothelial apathy and platelet dysfunction.”

She’s also looking into whether microvascular dysfunction could increase one’s risk for small vessel disease. Her research is quantitatively building an overall pathophysiology piece by piece.

“We’re quantifying cognitive dysfunction and using objective testing ... a very rigorous 3-hour protocol to really identify the patterns of weakness until we find deficits in memory working and declarative memory, deficits in executive functioning, and others. Those are the three pieces that I’m trying to piece together: The MRI, the blood work, and the cognitive testing,” she said.

Ultimately, Dr. McAlpine believes long COVID will eventually be classified as a peripheral autonomic disorder. The damage being wrought to the whole body also damages the brain’s vasculature, and Dr. McAlpine’s MRI techniques probe at this connection.

“Some of my MRI techniques are dependent on the very subtle changes in blood flow to different regions in response to demand. Brain fog has been a key symptom of POTS and ME/CFS. And it’s now a key symptom of long COVID ... what I’m looking at in some of my studies is how and in which parts of the brain are affected by this,” she said.

Dr. McAlpine’s interest in COVID’s effect on our nervous system goes back all the way to the first wave of patients with COVID, where she noticed an unusually high incidence of ischemic stroke.

“We recognized that COVID really has a huge impact on the vessels ... there’s quite a bit of vascular inflammation. In terms of neurology, we were seeing quite a bit of ischemic stroke, which is unusual,” she said.

Patients don’t normally present with stroke while infected with a virus. Seeking answers, she conducted a stroke study in patients with acute COVID and found profound endotheliopathy — damage to key cells in the lining of blood vessels — leading to a cascade of dysfunction and clotting.
 

A Constellation of Neuropsychiatric Symptoms

In early June, Dr. McAlpine gave a presentation of her research at the Demystifying Long COVID North American Conference 2024 in Boston. She’s been hard at work in extrapolating the causes of neuropsychiatric long COVID, a tangled web of symptoms seen in patients with long COVID that range from cognitive dysfunction to headaches, neuropathy, mental health, and the aforementioned dysautonomia.

Amid the sea of neurologic long COVID symptoms, she said “symptoms that are mixing and matching are very similar. So, I wanted to specifically look at a symptom that I could definitely isolate to the brain, and that is brain fog and cognitive dysfunction and impairment.”

In September 2021, the journal Translational Psychiatry published a study titled “Neuropsychiatric manifestations of COVID-19, potential neurotropic mechanisms, and therapeutic interventions.”

Going back all the way to the first cases of COVID in March 2020, the initial symptoms most patients complained of during an acute viral infection were around the respiratory system. Yet delirium, confusion, and neurocognitive disorders were also reported, puzzling experts and inciting a well-founded fear among many.

Even worse, after recovery, these neuropsychiatric symptoms persisted. The study found that coronavirus was able to invade the central nervous system through blood vessels and neuronal retrograde pathways, leading to brain injury and dysfunction of the cardiorespiratory center in the brainstem.

The study concluded by reporting that neuroimaging and neurochemical evidence indicated neuroimmune dysfunction and brain injury in severe patients with COVID-19. Suggested treatments included immunosuppressive therapies, vaccines to target the coronavirus’ spike protein, and pharmacological agents to improve endothelial integrity.

But there was still much that was unknown, and the study’s authors stressed the need for multidisciplinary research going forward.
 

How Immune Dysfunction Plays a Role

Similarly, Dr. McAlpine and her research team are still trying to sift their way through this opaque web to see why long COVID can cause autoimmune flare-ups.

In a study published in April, Dr. McAlpine and others found that small fiber neuropathy (SFN) after COVID is autoimmune-mediated and a dysfunction of the immune system.

Notably, they found that SFN could be a key pathologic finding in long COVID. SFN before the pandemic had been linked to ME/CFS and POTS, and the basic hypothesis revolved around an inflammatory immune response during a viral illness that may lead to immune dysregulation (dysimmunity) and damage to small fiber nerves.

But much still remains to be answered.

“We’ve seen quite a bit of that, but we still haven’t figured it out,” Dr. McAlpine said. “My big question is, how is this autonomic dysfunction related to the immune dysfunction, and how is that related to the vascular inflammation? There’s quite a bit of overlap in individuals with autoimmune disease and those who go on to develop this long COVID,” she added.

Still, a large portion of patients with long COVID don’t show autoimmune dysfunction, and those patients lack common biomarkers for an autoimmune condition.

“When we look at the spinal fluid in those individuals [with multiple sclerosis or a neuroinfectious disease], there’s inflammation going on ... the white blood cell count is elevated, the protein is elevated, the antibodies, the bands are elevated. I’ve been seeing long COVID patients now for 4 years, and their presentation is so distinctly different compared to my individuals that I see my patients with MS, or a neuroinfectious disease,” she said.

The mechanisms behind how all of this is interlaced remain unclear, and there may not be a one-size-fits-all treatment or definite pathogenesis for everyone.

“It’s that intersection of the immune system and the vessel wall ... Next is to figure out what do we treat, what are the targets, all of that, but there’s so many different presentations, and everybody has kind of a unique case,” she said.
 

How Physician Can Treat Common Symptoms Now

Though a cure for symptoms still eludes the scientific community, recent evidence has suggested that a combination of N-acetyl cysteine (NAC) and guanfacine has been successful in easing neurologic symptoms.

In November 2023, Arman Fesharaki-Zadeh, MD, PhD, a Yale Medicine behavioral neurologist and neuropsychiatrist, published a small study in Neuroimmunology Reports with his colleague, Yale neuroscientist Amy Arnsten, PhD. The two researchers showed how among 12 patients given 600 mg NAC daily, along with 1 mg guanfacine (increased to 2 mg after a month if well-tolerated), eight demonstrated improved cognitive abilities.

In patients who stayed on guanfacine + NAC, improved working memory, concentration, and executive functions were seen.

Also, they resumed their normal work schedule. Interruption and inability to work has been a significant factor in the lower quality-of-life long COVID patients experience.

Placebo-controlled trials will be needed going forward, but their small study has established safety and could open up a larger study in the future. For the moment, NAC can be gotten over the counter, and patients could get a prescription off-label from their doctor.

Dr. McAlpine has seen this combination work well for her own patients at Yale’s NeuroCOVID clinic.

Additionally, lifestyle practices such as quitting tobacco, increased exercise, exercising the mind, lowering alcohol intake, and even vitamin D supplementation (1000-2000 IU daily) could prove beneficial in tamping down persistent brain fog.

Vitamin D supports brain and nerve function through its reduction of brain aging biomarkers, regulating genes important for brain function, activating and deactivating enzymes important for neurotransmitter synthesis, and supporting neuronal growth and survival.

A version of this article first appeared on Medscape.com.

Neurologic symptoms of long COVID are vast, common, hard to treat, disabling, and can mimic dozens of other syndromes, with some symptoms as serious as those seen in myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) and postural orthostatic tachycardia syndrome (POTS).

Now, recent evidence has suggested long COVID is primarily an autonomic nervous system disorder.

Patients with long COVID increasingly complain of extreme fatigue, brain fog, cognitive issues, dizziness, irregular heart rhythms, and high or low blood pressure, all features seen with dysautonomia — dysregulation of the autonomic nervous system.

Their lives may never be the same.

Lindsay S. McAlpine, MD, a specialist in the neurologic sequelae of COVID-19 at the Yale School of Medicine and director of the Yale NeuroCOVID Clinic, New Haven, Connecticut, treats patients who struggle with neurologic symptoms even after disease recovery.

“Some people have the brain fog and the shortness of breath; some have the palpitations and the headaches ... it’s kind of a mix and match,” she said.

Dr. McAlpine’s research has been slowly building up into what could bring about a significant breakthrough in treating some of the most misunderstood and difficult-to-treat symptoms of long COVID.
 

The Effect of Vascular Inflammation on Long COVID

The National Institute of Neurological Disorders and Stroke recently awarded her a 5-year K23 grant to support her ongoing study, “Magnetic Resonance Imaging Biomarkers of Post-COVID-19 Cerebral Microvascular Dysfunction.”

Using advanced MRI techniques to identify microvascular dysfunction biomarkers in the brain, McAlpine hopes to unearth and better understand the pathophysiology behind neurologic issues post-COVID.

Dr. McAlpine said, “What we’re seeing is that there’s a unique signature of vascular inflammation in long COVID that is distinct from acute COVID. And it has to do with endothelial apathy and platelet dysfunction.”

She’s also looking into whether microvascular dysfunction could increase one’s risk for small vessel disease. Her research is quantitatively building an overall pathophysiology piece by piece.

“We’re quantifying cognitive dysfunction and using objective testing ... a very rigorous 3-hour protocol to really identify the patterns of weakness until we find deficits in memory working and declarative memory, deficits in executive functioning, and others. Those are the three pieces that I’m trying to piece together: The MRI, the blood work, and the cognitive testing,” she said.

Ultimately, Dr. McAlpine believes long COVID will eventually be classified as a peripheral autonomic disorder. The damage being wrought to the whole body also damages the brain’s vasculature, and Dr. McAlpine’s MRI techniques probe at this connection.

“Some of my MRI techniques are dependent on the very subtle changes in blood flow to different regions in response to demand. Brain fog has been a key symptom of POTS and ME/CFS. And it’s now a key symptom of long COVID ... what I’m looking at in some of my studies is how and in which parts of the brain are affected by this,” she said.

Dr. McAlpine’s interest in COVID’s effect on our nervous system goes back all the way to the first wave of patients with COVID, where she noticed an unusually high incidence of ischemic stroke.

“We recognized that COVID really has a huge impact on the vessels ... there’s quite a bit of vascular inflammation. In terms of neurology, we were seeing quite a bit of ischemic stroke, which is unusual,” she said.

Patients don’t normally present with stroke while infected with a virus. Seeking answers, she conducted a stroke study in patients with acute COVID and found profound endotheliopathy — damage to key cells in the lining of blood vessels — leading to a cascade of dysfunction and clotting.
 

A Constellation of Neuropsychiatric Symptoms

In early June, Dr. McAlpine gave a presentation of her research at the Demystifying Long COVID North American Conference 2024 in Boston. She’s been hard at work in extrapolating the causes of neuropsychiatric long COVID, a tangled web of symptoms seen in patients with long COVID that range from cognitive dysfunction to headaches, neuropathy, mental health, and the aforementioned dysautonomia.

Amid the sea of neurologic long COVID symptoms, she said “symptoms that are mixing and matching are very similar. So, I wanted to specifically look at a symptom that I could definitely isolate to the brain, and that is brain fog and cognitive dysfunction and impairment.”

In September 2021, the journal Translational Psychiatry published a study titled “Neuropsychiatric manifestations of COVID-19, potential neurotropic mechanisms, and therapeutic interventions.”

Going back all the way to the first cases of COVID in March 2020, the initial symptoms most patients complained of during an acute viral infection were around the respiratory system. Yet delirium, confusion, and neurocognitive disorders were also reported, puzzling experts and inciting a well-founded fear among many.

Even worse, after recovery, these neuropsychiatric symptoms persisted. The study found that coronavirus was able to invade the central nervous system through blood vessels and neuronal retrograde pathways, leading to brain injury and dysfunction of the cardiorespiratory center in the brainstem.

The study concluded by reporting that neuroimaging and neurochemical evidence indicated neuroimmune dysfunction and brain injury in severe patients with COVID-19. Suggested treatments included immunosuppressive therapies, vaccines to target the coronavirus’ spike protein, and pharmacological agents to improve endothelial integrity.

But there was still much that was unknown, and the study’s authors stressed the need for multidisciplinary research going forward.
 

How Immune Dysfunction Plays a Role

Similarly, Dr. McAlpine and her research team are still trying to sift their way through this opaque web to see why long COVID can cause autoimmune flare-ups.

In a study published in April, Dr. McAlpine and others found that small fiber neuropathy (SFN) after COVID is autoimmune-mediated and a dysfunction of the immune system.

Notably, they found that SFN could be a key pathologic finding in long COVID. SFN before the pandemic had been linked to ME/CFS and POTS, and the basic hypothesis revolved around an inflammatory immune response during a viral illness that may lead to immune dysregulation (dysimmunity) and damage to small fiber nerves.

But much still remains to be answered.

“We’ve seen quite a bit of that, but we still haven’t figured it out,” Dr. McAlpine said. “My big question is, how is this autonomic dysfunction related to the immune dysfunction, and how is that related to the vascular inflammation? There’s quite a bit of overlap in individuals with autoimmune disease and those who go on to develop this long COVID,” she added.

Still, a large portion of patients with long COVID don’t show autoimmune dysfunction, and those patients lack common biomarkers for an autoimmune condition.

“When we look at the spinal fluid in those individuals [with multiple sclerosis or a neuroinfectious disease], there’s inflammation going on ... the white blood cell count is elevated, the protein is elevated, the antibodies, the bands are elevated. I’ve been seeing long COVID patients now for 4 years, and their presentation is so distinctly different compared to my individuals that I see my patients with MS, or a neuroinfectious disease,” she said.

The mechanisms behind how all of this is interlaced remain unclear, and there may not be a one-size-fits-all treatment or definite pathogenesis for everyone.

“It’s that intersection of the immune system and the vessel wall ... Next is to figure out what do we treat, what are the targets, all of that, but there’s so many different presentations, and everybody has kind of a unique case,” she said.
 

How Physician Can Treat Common Symptoms Now

Though a cure for symptoms still eludes the scientific community, recent evidence has suggested that a combination of N-acetyl cysteine (NAC) and guanfacine has been successful in easing neurologic symptoms.

In November 2023, Arman Fesharaki-Zadeh, MD, PhD, a Yale Medicine behavioral neurologist and neuropsychiatrist, published a small study in Neuroimmunology Reports with his colleague, Yale neuroscientist Amy Arnsten, PhD. The two researchers showed how among 12 patients given 600 mg NAC daily, along with 1 mg guanfacine (increased to 2 mg after a month if well-tolerated), eight demonstrated improved cognitive abilities.

In patients who stayed on guanfacine + NAC, improved working memory, concentration, and executive functions were seen.

Also, they resumed their normal work schedule. Interruption and inability to work has been a significant factor in the lower quality-of-life long COVID patients experience.

Placebo-controlled trials will be needed going forward, but their small study has established safety and could open up a larger study in the future. For the moment, NAC can be gotten over the counter, and patients could get a prescription off-label from their doctor.

Dr. McAlpine has seen this combination work well for her own patients at Yale’s NeuroCOVID clinic.

Additionally, lifestyle practices such as quitting tobacco, increased exercise, exercising the mind, lowering alcohol intake, and even vitamin D supplementation (1000-2000 IU daily) could prove beneficial in tamping down persistent brain fog.

Vitamin D supports brain and nerve function through its reduction of brain aging biomarkers, regulating genes important for brain function, activating and deactivating enzymes important for neurotransmitter synthesis, and supporting neuronal growth and survival.

A version of this article first appeared on Medscape.com.

Neurologic symptoms of long COVID are vast, common, hard to treat, disabling, and can mimic dozens of other syndromes, with some symptoms as serious as those seen in myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) and postural orthostatic tachycardia syndrome (POTS).

Now, recent evidence has suggested long COVID is primarily an autonomic nervous system disorder.

Patients with long COVID increasingly complain of extreme fatigue, brain fog, cognitive issues, dizziness, irregular heart rhythms, and high or low blood pressure, all features seen with dysautonomia — dysregulation of the autonomic nervous system.

Their lives may never be the same.

Lindsay S. McAlpine, MD, a specialist in the neurologic sequelae of COVID-19 at the Yale School of Medicine and director of the Yale NeuroCOVID Clinic, New Haven, Connecticut, treats patients who struggle with neurologic symptoms even after disease recovery.

“Some people have the brain fog and the shortness of breath; some have the palpitations and the headaches ... it’s kind of a mix and match,” she said.

Dr. McAlpine’s research has been slowly building up into what could bring about a significant breakthrough in treating some of the most misunderstood and difficult-to-treat symptoms of long COVID.
 

The Effect of Vascular Inflammation on Long COVID

The National Institute of Neurological Disorders and Stroke recently awarded her a 5-year K23 grant to support her ongoing study, “Magnetic Resonance Imaging Biomarkers of Post-COVID-19 Cerebral Microvascular Dysfunction.”

Using advanced MRI techniques to identify microvascular dysfunction biomarkers in the brain, McAlpine hopes to unearth and better understand the pathophysiology behind neurologic issues post-COVID.

Dr. McAlpine said, “What we’re seeing is that there’s a unique signature of vascular inflammation in long COVID that is distinct from acute COVID. And it has to do with endothelial apathy and platelet dysfunction.”

She’s also looking into whether microvascular dysfunction could increase one’s risk for small vessel disease. Her research is quantitatively building an overall pathophysiology piece by piece.

“We’re quantifying cognitive dysfunction and using objective testing ... a very rigorous 3-hour protocol to really identify the patterns of weakness until we find deficits in memory working and declarative memory, deficits in executive functioning, and others. Those are the three pieces that I’m trying to piece together: The MRI, the blood work, and the cognitive testing,” she said.

Ultimately, Dr. McAlpine believes long COVID will eventually be classified as a peripheral autonomic disorder. The damage being wrought to the whole body also damages the brain’s vasculature, and Dr. McAlpine’s MRI techniques probe at this connection.

“Some of my MRI techniques are dependent on the very subtle changes in blood flow to different regions in response to demand. Brain fog has been a key symptom of POTS and ME/CFS. And it’s now a key symptom of long COVID ... what I’m looking at in some of my studies is how and in which parts of the brain are affected by this,” she said.

Dr. McAlpine’s interest in COVID’s effect on our nervous system goes back all the way to the first wave of patients with COVID, where she noticed an unusually high incidence of ischemic stroke.

“We recognized that COVID really has a huge impact on the vessels ... there’s quite a bit of vascular inflammation. In terms of neurology, we were seeing quite a bit of ischemic stroke, which is unusual,” she said.

Patients don’t normally present with stroke while infected with a virus. Seeking answers, she conducted a stroke study in patients with acute COVID and found profound endotheliopathy — damage to key cells in the lining of blood vessels — leading to a cascade of dysfunction and clotting.
 

A Constellation of Neuropsychiatric Symptoms

In early June, Dr. McAlpine gave a presentation of her research at the Demystifying Long COVID North American Conference 2024 in Boston. She’s been hard at work in extrapolating the causes of neuropsychiatric long COVID, a tangled web of symptoms seen in patients with long COVID that range from cognitive dysfunction to headaches, neuropathy, mental health, and the aforementioned dysautonomia.

Amid the sea of neurologic long COVID symptoms, she said “symptoms that are mixing and matching are very similar. So, I wanted to specifically look at a symptom that I could definitely isolate to the brain, and that is brain fog and cognitive dysfunction and impairment.”

In September 2021, the journal Translational Psychiatry published a study titled “Neuropsychiatric manifestations of COVID-19, potential neurotropic mechanisms, and therapeutic interventions.”

Going back all the way to the first cases of COVID in March 2020, the initial symptoms most patients complained of during an acute viral infection were around the respiratory system. Yet delirium, confusion, and neurocognitive disorders were also reported, puzzling experts and inciting a well-founded fear among many.

Even worse, after recovery, these neuropsychiatric symptoms persisted. The study found that coronavirus was able to invade the central nervous system through blood vessels and neuronal retrograde pathways, leading to brain injury and dysfunction of the cardiorespiratory center in the brainstem.

The study concluded by reporting that neuroimaging and neurochemical evidence indicated neuroimmune dysfunction and brain injury in severe patients with COVID-19. Suggested treatments included immunosuppressive therapies, vaccines to target the coronavirus’ spike protein, and pharmacological agents to improve endothelial integrity.

But there was still much that was unknown, and the study’s authors stressed the need for multidisciplinary research going forward.
 

How Immune Dysfunction Plays a Role

Similarly, Dr. McAlpine and her research team are still trying to sift their way through this opaque web to see why long COVID can cause autoimmune flare-ups.

In a study published in April, Dr. McAlpine and others found that small fiber neuropathy (SFN) after COVID is autoimmune-mediated and a dysfunction of the immune system.

Notably, they found that SFN could be a key pathologic finding in long COVID. SFN before the pandemic had been linked to ME/CFS and POTS, and the basic hypothesis revolved around an inflammatory immune response during a viral illness that may lead to immune dysregulation (dysimmunity) and damage to small fiber nerves.

But much still remains to be answered.

“We’ve seen quite a bit of that, but we still haven’t figured it out,” Dr. McAlpine said. “My big question is, how is this autonomic dysfunction related to the immune dysfunction, and how is that related to the vascular inflammation? There’s quite a bit of overlap in individuals with autoimmune disease and those who go on to develop this long COVID,” she added.

Still, a large portion of patients with long COVID don’t show autoimmune dysfunction, and those patients lack common biomarkers for an autoimmune condition.

“When we look at the spinal fluid in those individuals [with multiple sclerosis or a neuroinfectious disease], there’s inflammation going on ... the white blood cell count is elevated, the protein is elevated, the antibodies, the bands are elevated. I’ve been seeing long COVID patients now for 4 years, and their presentation is so distinctly different compared to my individuals that I see my patients with MS, or a neuroinfectious disease,” she said.

The mechanisms behind how all of this is interlaced remain unclear, and there may not be a one-size-fits-all treatment or definite pathogenesis for everyone.

“It’s that intersection of the immune system and the vessel wall ... Next is to figure out what do we treat, what are the targets, all of that, but there’s so many different presentations, and everybody has kind of a unique case,” she said.
 

How Physician Can Treat Common Symptoms Now

Though a cure for symptoms still eludes the scientific community, recent evidence has suggested that a combination of N-acetyl cysteine (NAC) and guanfacine has been successful in easing neurologic symptoms.

In November 2023, Arman Fesharaki-Zadeh, MD, PhD, a Yale Medicine behavioral neurologist and neuropsychiatrist, published a small study in Neuroimmunology Reports with his colleague, Yale neuroscientist Amy Arnsten, PhD. The two researchers showed how among 12 patients given 600 mg NAC daily, along with 1 mg guanfacine (increased to 2 mg after a month if well-tolerated), eight demonstrated improved cognitive abilities.

In patients who stayed on guanfacine + NAC, improved working memory, concentration, and executive functions were seen.

Also, they resumed their normal work schedule. Interruption and inability to work has been a significant factor in the lower quality-of-life long COVID patients experience.

Placebo-controlled trials will be needed going forward, but their small study has established safety and could open up a larger study in the future. For the moment, NAC can be gotten over the counter, and patients could get a prescription off-label from their doctor.

Dr. McAlpine has seen this combination work well for her own patients at Yale’s NeuroCOVID clinic.

Additionally, lifestyle practices such as quitting tobacco, increased exercise, exercising the mind, lowering alcohol intake, and even vitamin D supplementation (1000-2000 IU daily) could prove beneficial in tamping down persistent brain fog.

Vitamin D supports brain and nerve function through its reduction of brain aging biomarkers, regulating genes important for brain function, activating and deactivating enzymes important for neurotransmitter synthesis, and supporting neuronal growth and survival.

A version of this article first appeared on Medscape.com.