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Cognitive Deficits After Most Severe COVID Cases Associated With 9-Point IQ Drop
A new study from the United Kingdom provides greater clarity on how SARS-CoV-2 infection can affect cognition and memory, including novel data on how long brain fog may last after the illness resolves and which cognitive functions are most vulnerable.
In a large community sample, researchers found that on average, people who had recovered from COVID-19 showed small cognitive deficits equivalent to a 3-point loss in IQ for up to 1 year or more after recovering from the acute illness compared with peers who never had COVID-19.
However, people who had more severe cases, requiring treatment in a hospital intensive care unit, had cognitive deficits equivalent to a 9-point drop in IQ.
“People with ongoing persistent symptoms, indicative of long COVID, had larger cognitive deficits than people whose symptoms had resolved,” first author Adam Hampshire, PhD, with Imperial College London, London, England, told this news organization.
The largest deficits among cognitive tasks were in memory, reasoning, and executive function, he added.
“That is, people who had had COVID-19 were both slower and less accurate when performing tasks that measure those abilities,” Dr. Hampshire said. “The group with the largest cognitive deficits were patients who had been in intensive care for COVID-19.”
The study was published online in The New England Journal of Medicine.
Lingering Brain Fog
Cognitive symptoms after SARS-CoV-2 infection are well recognized, but whether objectively measurable cognitive deficits exist and how long they persist remains unclear.
To investigate, researchers invited 800,000 adults from the REACT study of SARS-CoV-2 transmission in England to complete an online assessment for cognitive function with eight domains.
Altogether, 141,583 participants started the cognitive battery by completing at least one task, and 112,964 completed all eight tasks.
The researchers estimated global cognitive scores among participants who had been previously infected with SARS-CoV-2 with symptoms that persisted for at least 12 weeks, whether or not resolved, and among uninfected participants.
Compared with uninfected adults, those who had COVID-19 that resolved had a small cognitive deficit, corresponding to a 3-point loss in IQ, the researchers found.
Adults with unresolved persistent COVID-19 symptoms had the equivalent of a 6-point loss in IQ, and those who had been admitted to the intensive care unit had the equivalent of a 9-point loss in IQ, in line with previous findings of cognitive deficits in patients hospitalized in a critical care unit, the researchers report.
Larger cognitive deficits were evident in adults infected early in the pandemic by the original SARS-CoV-2 virus or the B.1.1.7 variant, whereas peers infected later in the pandemic (eg., in the Omicron period), showed smaller cognitive deficits. This finding is in line with other studies suggesting that the association between COVID-19–associated cognitive deficits attenuated as the pandemic progressed, the researchers noted.
They also found that people who had COVID-19 after receiving two or more vaccinations showed better cognitive performance compared with those who had not been vaccinated.
The memory, reasoning, and executive function tasks were among the most sensitive to COVID-19–related cognitive differences and performance on these tasks differed according to illness duration and hospitalization.
Dr. Hampshire said that more research is needed to determine whether the cognitive deficits resolve with time.
“The implications of longer-term persistence of cognitive deficits and their clinical relevance remain unclear and warrant ongoing surveillance,” he said.
Larger Cognitive Deficits Likely?
These results are “a concern and the broader implications require evaluation,” wrote Ziyad Al-Aly, MD, with Washington University School of Medicine in St. Louis, Missouri, and Clifford Rosen, MD, with Tufts University School of Medicine in Boston, Massachusetts, in an accompanying editorial.
In their view, several outstanding questions remain, including what the potential functional implications of a 3-point loss in IQ may be and whether COVID-19–related cognitive deficits predispose to a higher risk for dementia later in life.
“A deeper understanding of the biology of cognitive dysfunction after SARS-CoV-2 infection and how best to prevent and treat it are critical for addressing the needs of affected persons and preserving the cognitive health of populations,” Drs. Al-Aly and Rosen concluded.
Commenting on the study for this news organization, Jacqueline Becker, PhD, clinical neuropsychologist and assistant professor of medicine, Icahn School of Medicine at Mount Sinai, New York City, noted that “one important caveat” is that the study used an online assessment tool for cognitive function and therefore the findings should be taken with “a grain of salt.”
“That said, this is a large sample, and the findings are generally consistent with what we’ve seen in terms of cognitive deficits post-COVID,” Dr. Becker said.
It’s likely that this study “underestimates” the degree of cognitive deficits that would be seen on validated neuropsychological tests, she added.
In a recent study, Dr. Becker and her colleagues investigated rates of cognitive impairment in 740 COVID-19 patients who recovered and were treated in outpatient, emergency department, or inpatient hospital settings.
Using validated neuropsychological measures, they found a relatively high frequency of cognitive impairment several months after patients contracted COVID-19. Impairments in executive functioning, processing speed, category fluency, memory encoding, and recall were predominant among hospitalized patients.
Dr. Becker noted that in her experience, cognition typically will improve in some patients 12-18 months post COVID.
Support for the study was provided by the National Institute for Health and Care Research and UK Research and Innovation and by the Department of Health and Social Care in England and the Huo Family Foundation. Disclosures for authors and editorial writers are available at NEJM.org. Dr. Becker has no relevant disclosures.
A version of this article appeared on Medscape.com.
A new study from the United Kingdom provides greater clarity on how SARS-CoV-2 infection can affect cognition and memory, including novel data on how long brain fog may last after the illness resolves and which cognitive functions are most vulnerable.
In a large community sample, researchers found that on average, people who had recovered from COVID-19 showed small cognitive deficits equivalent to a 3-point loss in IQ for up to 1 year or more after recovering from the acute illness compared with peers who never had COVID-19.
However, people who had more severe cases, requiring treatment in a hospital intensive care unit, had cognitive deficits equivalent to a 9-point drop in IQ.
“People with ongoing persistent symptoms, indicative of long COVID, had larger cognitive deficits than people whose symptoms had resolved,” first author Adam Hampshire, PhD, with Imperial College London, London, England, told this news organization.
The largest deficits among cognitive tasks were in memory, reasoning, and executive function, he added.
“That is, people who had had COVID-19 were both slower and less accurate when performing tasks that measure those abilities,” Dr. Hampshire said. “The group with the largest cognitive deficits were patients who had been in intensive care for COVID-19.”
The study was published online in The New England Journal of Medicine.
Lingering Brain Fog
Cognitive symptoms after SARS-CoV-2 infection are well recognized, but whether objectively measurable cognitive deficits exist and how long they persist remains unclear.
To investigate, researchers invited 800,000 adults from the REACT study of SARS-CoV-2 transmission in England to complete an online assessment for cognitive function with eight domains.
Altogether, 141,583 participants started the cognitive battery by completing at least one task, and 112,964 completed all eight tasks.
The researchers estimated global cognitive scores among participants who had been previously infected with SARS-CoV-2 with symptoms that persisted for at least 12 weeks, whether or not resolved, and among uninfected participants.
Compared with uninfected adults, those who had COVID-19 that resolved had a small cognitive deficit, corresponding to a 3-point loss in IQ, the researchers found.
Adults with unresolved persistent COVID-19 symptoms had the equivalent of a 6-point loss in IQ, and those who had been admitted to the intensive care unit had the equivalent of a 9-point loss in IQ, in line with previous findings of cognitive deficits in patients hospitalized in a critical care unit, the researchers report.
Larger cognitive deficits were evident in adults infected early in the pandemic by the original SARS-CoV-2 virus or the B.1.1.7 variant, whereas peers infected later in the pandemic (eg., in the Omicron period), showed smaller cognitive deficits. This finding is in line with other studies suggesting that the association between COVID-19–associated cognitive deficits attenuated as the pandemic progressed, the researchers noted.
They also found that people who had COVID-19 after receiving two or more vaccinations showed better cognitive performance compared with those who had not been vaccinated.
The memory, reasoning, and executive function tasks were among the most sensitive to COVID-19–related cognitive differences and performance on these tasks differed according to illness duration and hospitalization.
Dr. Hampshire said that more research is needed to determine whether the cognitive deficits resolve with time.
“The implications of longer-term persistence of cognitive deficits and their clinical relevance remain unclear and warrant ongoing surveillance,” he said.
Larger Cognitive Deficits Likely?
These results are “a concern and the broader implications require evaluation,” wrote Ziyad Al-Aly, MD, with Washington University School of Medicine in St. Louis, Missouri, and Clifford Rosen, MD, with Tufts University School of Medicine in Boston, Massachusetts, in an accompanying editorial.
In their view, several outstanding questions remain, including what the potential functional implications of a 3-point loss in IQ may be and whether COVID-19–related cognitive deficits predispose to a higher risk for dementia later in life.
“A deeper understanding of the biology of cognitive dysfunction after SARS-CoV-2 infection and how best to prevent and treat it are critical for addressing the needs of affected persons and preserving the cognitive health of populations,” Drs. Al-Aly and Rosen concluded.
Commenting on the study for this news organization, Jacqueline Becker, PhD, clinical neuropsychologist and assistant professor of medicine, Icahn School of Medicine at Mount Sinai, New York City, noted that “one important caveat” is that the study used an online assessment tool for cognitive function and therefore the findings should be taken with “a grain of salt.”
“That said, this is a large sample, and the findings are generally consistent with what we’ve seen in terms of cognitive deficits post-COVID,” Dr. Becker said.
It’s likely that this study “underestimates” the degree of cognitive deficits that would be seen on validated neuropsychological tests, she added.
In a recent study, Dr. Becker and her colleagues investigated rates of cognitive impairment in 740 COVID-19 patients who recovered and were treated in outpatient, emergency department, or inpatient hospital settings.
Using validated neuropsychological measures, they found a relatively high frequency of cognitive impairment several months after patients contracted COVID-19. Impairments in executive functioning, processing speed, category fluency, memory encoding, and recall were predominant among hospitalized patients.
Dr. Becker noted that in her experience, cognition typically will improve in some patients 12-18 months post COVID.
Support for the study was provided by the National Institute for Health and Care Research and UK Research and Innovation and by the Department of Health and Social Care in England and the Huo Family Foundation. Disclosures for authors and editorial writers are available at NEJM.org. Dr. Becker has no relevant disclosures.
A version of this article appeared on Medscape.com.
A new study from the United Kingdom provides greater clarity on how SARS-CoV-2 infection can affect cognition and memory, including novel data on how long brain fog may last after the illness resolves and which cognitive functions are most vulnerable.
In a large community sample, researchers found that on average, people who had recovered from COVID-19 showed small cognitive deficits equivalent to a 3-point loss in IQ for up to 1 year or more after recovering from the acute illness compared with peers who never had COVID-19.
However, people who had more severe cases, requiring treatment in a hospital intensive care unit, had cognitive deficits equivalent to a 9-point drop in IQ.
“People with ongoing persistent symptoms, indicative of long COVID, had larger cognitive deficits than people whose symptoms had resolved,” first author Adam Hampshire, PhD, with Imperial College London, London, England, told this news organization.
The largest deficits among cognitive tasks were in memory, reasoning, and executive function, he added.
“That is, people who had had COVID-19 were both slower and less accurate when performing tasks that measure those abilities,” Dr. Hampshire said. “The group with the largest cognitive deficits were patients who had been in intensive care for COVID-19.”
The study was published online in The New England Journal of Medicine.
Lingering Brain Fog
Cognitive symptoms after SARS-CoV-2 infection are well recognized, but whether objectively measurable cognitive deficits exist and how long they persist remains unclear.
To investigate, researchers invited 800,000 adults from the REACT study of SARS-CoV-2 transmission in England to complete an online assessment for cognitive function with eight domains.
Altogether, 141,583 participants started the cognitive battery by completing at least one task, and 112,964 completed all eight tasks.
The researchers estimated global cognitive scores among participants who had been previously infected with SARS-CoV-2 with symptoms that persisted for at least 12 weeks, whether or not resolved, and among uninfected participants.
Compared with uninfected adults, those who had COVID-19 that resolved had a small cognitive deficit, corresponding to a 3-point loss in IQ, the researchers found.
Adults with unresolved persistent COVID-19 symptoms had the equivalent of a 6-point loss in IQ, and those who had been admitted to the intensive care unit had the equivalent of a 9-point loss in IQ, in line with previous findings of cognitive deficits in patients hospitalized in a critical care unit, the researchers report.
Larger cognitive deficits were evident in adults infected early in the pandemic by the original SARS-CoV-2 virus or the B.1.1.7 variant, whereas peers infected later in the pandemic (eg., in the Omicron period), showed smaller cognitive deficits. This finding is in line with other studies suggesting that the association between COVID-19–associated cognitive deficits attenuated as the pandemic progressed, the researchers noted.
They also found that people who had COVID-19 after receiving two or more vaccinations showed better cognitive performance compared with those who had not been vaccinated.
The memory, reasoning, and executive function tasks were among the most sensitive to COVID-19–related cognitive differences and performance on these tasks differed according to illness duration and hospitalization.
Dr. Hampshire said that more research is needed to determine whether the cognitive deficits resolve with time.
“The implications of longer-term persistence of cognitive deficits and their clinical relevance remain unclear and warrant ongoing surveillance,” he said.
Larger Cognitive Deficits Likely?
These results are “a concern and the broader implications require evaluation,” wrote Ziyad Al-Aly, MD, with Washington University School of Medicine in St. Louis, Missouri, and Clifford Rosen, MD, with Tufts University School of Medicine in Boston, Massachusetts, in an accompanying editorial.
In their view, several outstanding questions remain, including what the potential functional implications of a 3-point loss in IQ may be and whether COVID-19–related cognitive deficits predispose to a higher risk for dementia later in life.
“A deeper understanding of the biology of cognitive dysfunction after SARS-CoV-2 infection and how best to prevent and treat it are critical for addressing the needs of affected persons and preserving the cognitive health of populations,” Drs. Al-Aly and Rosen concluded.
Commenting on the study for this news organization, Jacqueline Becker, PhD, clinical neuropsychologist and assistant professor of medicine, Icahn School of Medicine at Mount Sinai, New York City, noted that “one important caveat” is that the study used an online assessment tool for cognitive function and therefore the findings should be taken with “a grain of salt.”
“That said, this is a large sample, and the findings are generally consistent with what we’ve seen in terms of cognitive deficits post-COVID,” Dr. Becker said.
It’s likely that this study “underestimates” the degree of cognitive deficits that would be seen on validated neuropsychological tests, she added.
In a recent study, Dr. Becker and her colleagues investigated rates of cognitive impairment in 740 COVID-19 patients who recovered and were treated in outpatient, emergency department, or inpatient hospital settings.
Using validated neuropsychological measures, they found a relatively high frequency of cognitive impairment several months after patients contracted COVID-19. Impairments in executive functioning, processing speed, category fluency, memory encoding, and recall were predominant among hospitalized patients.
Dr. Becker noted that in her experience, cognition typically will improve in some patients 12-18 months post COVID.
Support for the study was provided by the National Institute for Health and Care Research and UK Research and Innovation and by the Department of Health and Social Care in England and the Huo Family Foundation. Disclosures for authors and editorial writers are available at NEJM.org. Dr. Becker has no relevant disclosures.
A version of this article appeared on Medscape.com.
Medtronic’s Duet EDMS Catheter Tubing Under Class I Recall
If this happens, potential harm to patients may include infections, cerebrospinal fluid (CSF) leakage, overdrainage of CSF, and abnormality of the ventricles. Uncontrolled overdrainage of CSF could lead to neurological injury or death if the disconnection is undetected.
The Food and Drug Administration has identified this as a Class I recall — the most serious type — due to the risk for serious injury or death. To date, there have been 26 reported injuries and no deaths related to this issue.
The recall includes 45,176 devices distributed in the United States between May 3, 2021, and January 9, 2024, with model numbers 46913, 46914, 46915, 46916, and 46917.
The Duet EDMS is used for temporary CSF drainage or sampling in patients who have surgery for open descending thoracic aortic aneurysm (TAA) or descending thoraco-abdominal aortic aneurysm (TAAA) or patients who have TAA/TAAA repair surgery and develop symptoms such as paraplegia.
Medtronic has sent an urgent medical device recall letter to all affected customers asking them to identify, quarantine, and return any unused recalled products.
Customers are also advised to check all Duet EDMS components for damage and ensure that all connections are secure and leak-free.
If a patient is currently connected to an impacted Duet EDMS and a leak or disconnection is detected, the device should be changed to a new alternative device utilizing a sterile technique.
It is not recommended that a Duet system device that is connected to a patient and working as intended be removed or replaced.
Customers in the United States with questions about this recall should contact Medtronic at 1-800-874-5797.
A version of this article appeared on Medscape.com.
If this happens, potential harm to patients may include infections, cerebrospinal fluid (CSF) leakage, overdrainage of CSF, and abnormality of the ventricles. Uncontrolled overdrainage of CSF could lead to neurological injury or death if the disconnection is undetected.
The Food and Drug Administration has identified this as a Class I recall — the most serious type — due to the risk for serious injury or death. To date, there have been 26 reported injuries and no deaths related to this issue.
The recall includes 45,176 devices distributed in the United States between May 3, 2021, and January 9, 2024, with model numbers 46913, 46914, 46915, 46916, and 46917.
The Duet EDMS is used for temporary CSF drainage or sampling in patients who have surgery for open descending thoracic aortic aneurysm (TAA) or descending thoraco-abdominal aortic aneurysm (TAAA) or patients who have TAA/TAAA repair surgery and develop symptoms such as paraplegia.
Medtronic has sent an urgent medical device recall letter to all affected customers asking them to identify, quarantine, and return any unused recalled products.
Customers are also advised to check all Duet EDMS components for damage and ensure that all connections are secure and leak-free.
If a patient is currently connected to an impacted Duet EDMS and a leak or disconnection is detected, the device should be changed to a new alternative device utilizing a sterile technique.
It is not recommended that a Duet system device that is connected to a patient and working as intended be removed or replaced.
Customers in the United States with questions about this recall should contact Medtronic at 1-800-874-5797.
A version of this article appeared on Medscape.com.
If this happens, potential harm to patients may include infections, cerebrospinal fluid (CSF) leakage, overdrainage of CSF, and abnormality of the ventricles. Uncontrolled overdrainage of CSF could lead to neurological injury or death if the disconnection is undetected.
The Food and Drug Administration has identified this as a Class I recall — the most serious type — due to the risk for serious injury or death. To date, there have been 26 reported injuries and no deaths related to this issue.
The recall includes 45,176 devices distributed in the United States between May 3, 2021, and January 9, 2024, with model numbers 46913, 46914, 46915, 46916, and 46917.
The Duet EDMS is used for temporary CSF drainage or sampling in patients who have surgery for open descending thoracic aortic aneurysm (TAA) or descending thoraco-abdominal aortic aneurysm (TAAA) or patients who have TAA/TAAA repair surgery and develop symptoms such as paraplegia.
Medtronic has sent an urgent medical device recall letter to all affected customers asking them to identify, quarantine, and return any unused recalled products.
Customers are also advised to check all Duet EDMS components for damage and ensure that all connections are secure and leak-free.
If a patient is currently connected to an impacted Duet EDMS and a leak or disconnection is detected, the device should be changed to a new alternative device utilizing a sterile technique.
It is not recommended that a Duet system device that is connected to a patient and working as intended be removed or replaced.
Customers in the United States with questions about this recall should contact Medtronic at 1-800-874-5797.
A version of this article appeared on Medscape.com.
Alzheimer’s Research Has an Integrity Problem, Claim Investigators
The book is yet to be closed, for instance, on whether a 2006 paper by Sylvain Lesne positing amyloid as a major cause of Alzheimer’s was based on fraudulent data. Suspicions about the paper were first raised in late 2021 by Matthew Schrag, MD, PhD, an assistant professor of neurology at Vanderbilt University Medical Center, Nashville, Tennessee.
Dr. Schrag also queried the work of a City University of New York (CUNY) researcher who proposed PT-125 (now simufilam) as a potential anti-amyloid for Alzheimer’s disease. Even though CUNY recently found “egregious” and potentially deliberate misconduct by that researcher, Cassava Sciences is continuing phase 3 trials of simufilam.
Now questions are being raised about work from the lab of Berislav V. Zlokovic, PhD, a prominent neuroscientist at the University of Southern California (USC), Los Angeles, California, and also about studies conducted under the aegis of Domenico Pratico, MD, the director of the Alzheimer’s Center at Temple University in Philadelphia, Pennsylvania.
Alzheimer’s has been a notoriously hard puzzle to solve. Despite decades of research, there are still no effective therapies and disparate theories about potential causes.
Dr. Schrag said he wouldn’t “attribute all the ills in this field” to misconduct, but it “is absolutely a part of the equation.” Some of the papers flagged for integrity issues “have been hugely influential,” he said in an interview. “Some of the labs that we’re talking about have really shaped how we’ve thought about this disease,” he said. “It’s hard to un-ring the bell.”
The fallout from fraud has a wide impact. Taxpayer dollars are wasted in the creation of the fraud and in attempts to replicate the failed experiment. Grad students — the workhorses of labs — waste time trying to repeat studies or may be bullied or intimidated into misconduct, said Elisabeth Bik, PhD, a former Stanford microbiologist who is now a full-time fraud investigator.
And there’s potential harm to patients. “There’s a lot of false hope being given to these people and their families,” Dr. Bik said in an interview.
Alzheimer’s Tempts With Big Rewards
There are big rewards for those who publish important papers on Alzheimer’s: More grants, publication in higher-impact journals, larger labs, and potentially, personal enrichment from commercialization of therapies.
“I can see that people are driven to cut corners or even to make up results, or even anything in between, to reach that goal,” said Dr. Bik.
It’s unclear whether misconduct and fraud are on the rise or just being detected more frequently.
“It’s very hard to say,” said Mike Rossner, PhD, president of Image Data Integrity. Institutions hire Dr. Rossner to help ferret out research integrity issues. He told this news organization that it’s likely detection is on the rise, given the increasing number of sleuths like Dr. Bik.
In 2002, Dr. Rossner began to screen all images submitted to the Journal of Clinical Biology in response to the new phenomenon of digital images and the advent of PhotoShop. “Very early on, we started to see problems in digital images that we would not have seen on a glossy printout,” Dr. Rossner said of his time as managing editor of the journal.
From 2002 to 2014, at least 25% of papers had an image that violated guidelines that prohibited the removal of spots or other blemishes (called “beautification”) with PhotoShop, which did not necessarily indicate fraud. They withdrew acceptance for 1% of papers because of image manipulations that affected data interpretation.
Dr. Bik noted that even if there is not a greater percentage of fraudulent papers in Alzheimer’s, “it would still be in absolute numbers a lot of papers that could be fraudulent,” given that Alzheimer’s research is well-funded with federal agencies alone providing $3.7 billion a year.
Images Key to Spotting Issues
Investigative sleuths often use the online forum PubPeer to initially raise questions about papers. The format gives the original authors a chance to comment on or defend their work. While some critiques are about data, most hone in on alleged duplications or manipulations of images, primarily by Western Blots.
The images are key, because “the images are the data,” said Dr. Rossner. “The words are the author’s interpretation of what they see in the images,” he said.
It’s also easier to spot a problem in an image. The raw data or an investigator’s notebooks aren’t needed, and there are artificial intelligence-driven software programs such as Proofig and Image Twin that help investigators spot duplicated images or cases in which an image might have been flipped or otherwise manipulated to make results look better.
Science recently announced that it would be using Proofig to screen images in all papers submitted to its six journals.
Using a screening tool is better than nothing, said Dr. Rossner who still relies on visual inspection, employing contrast or other features in PhotoShop to spot inconsistencies or duplications. But “none of those companies have disclosed how effective they are relative to visual screening, and that to me is very problematic,” he said.
“The tools are not going to catch everything,” said Dr. Bik.
Dr. Schrag agreed. “One of the things that we’re worried about is that a lot of the journals will simply adopt these tools as a screener and assume that that’s going to de-risk their publication portfolio,” he said, noting the high rate of misses.
Artificial Intelligence a Growing Concern
Artificial intelligence (AI) may also accelerate the amount of fraud and add to the difficulty of ferreting it out, said the investigators.
“I’m very worried about AI,” said Dr. Bik. Although AI-generated images and content may be rudimentary today, “next year it’s going to be much better,” she said. Going forward, it may be hard to distinguish between a real dataset and one that has been generated by AI, she said.
“The more closely AI can mimic authentic content, the more difficult it will be for publications to detect intentionally fraudulent submissions,” wrote Dror Kolodkin-Gal, PhD, the founder of Proofig, in an article for the Council of Science Editors.
Dr. Kolodkin-Gal said that AI may be especially prone to misuse by paper mills. Those operations submit fake or shoddy manuscripts to a journal on behalf of researchers seeking publication who pay the mills a fee. The Committee on Publication Ethics reported in 2022 that 2%-46% of papers submitted to journals may be from paper mills.
While it’s unclear whether AI is having any impact now, Dr. Rossner said, “I think I can be pretty confident in saying it is going to be a growing problem” as the tools become more sophisticated.
He sees parallels with the rise of PhotoShop and cites data from the National Institute of Health’s Office of Research Integrity (ORI) showing that in 1990, when PhotoShop was still new, 2% of cases referred to ORI involved image manipulation. By 2007, 70% of cases had image manipulation issues.
Journals, Institutions Need to Step Up More
Fraud may continue apace in part because investigations drag on for years, and in many cases, with a lack of consequences for the perpetrators, said the investigators. And, they say, journals and institutions haven’t devoted enough resources to prevent or investigate misconduct.
“A lot of editors did not even want to investigate because they just didn’t want to believe that there could be fraud in science,” said Dr. Bik of her experiences. “I hope that by now most journals at least should have realized that some proportion of the manuscripts that get sent to their journals is going to be fraud,” she said.
“The bulk of the journals seem like they don’t want to be bothered by this,” agreed Dr. Schrag, adding that “some have gone to great lengths to try to discourage people from bringing forward complaints.”
A big issue is that journals “don’t answer to any higher authority,” said Dr. Schrag. He believes that journals that repeatedly refuse to address integrity issues should be barred from publishing research produced with funds from the National Institutes of Health.
All the investigators said institutions and journals should hire forensic investigators. Relying on unpaid peer reviewers or editors to root out fraud is unrealistic, they said.
“You want to have specialized people with experience and be paid to do that as a full-time job,” said Dr. Bik, who is funded by speaking engagements and receives about $2300 a month through donations to her Patreon account.
Once a potential integrity issue is flagged, there is “an incredible conflict of interest in how these investigations are run,” said Dr. Schrag. “Institutions are asked to investigate their own faculty; they’re asked to investigate themselves.” That “creates the disincentive to move expeditiously,” said Dr. Schrag.
With the space of time, people who have committed fraud can throw out notebooks, delete data from servers, or even PhotoShop original photos so they match the manipulated ones that were submitted, Dr. Bik said.
Institutions could show they are serious about fraud by offering a “central, systematic universal screening of all image data going out of their institutions before submission to a journal,” said Dr. Rossner. But he knows only of a handful that do so. “I think research integrity offices have historically been very reactive, and they need to pivot and become proactive,” said Dr. Rossner.
Dr. Schrag wants to see stronger values within the research enterprise. “You have to build a culture where it’s absolutely anathema at a core level to violate these standards of research integrity,” he said. “We have this notion that we can push the process along faster and get to a grant and get to a paper and get to some short-term goal,” he said. “But the long-term goal in most of these cases is to cure a disease or to understand some biological mysteries. There’s no shortcut to getting there,” said Dr. Schrag.
There have been some high-profile consequences for research integrity failures, such as the 2023 resignation of Stanford University President Marc Tessier-Lavigne in the wake of findings that members of his lab — but not Tessier-Lavigne — engaged in data manipulation.
The process is often opaque, with investigations done in secrecy. “Consequences are not usually revealed, either,” said Dr. Rossner.
Dr. Schrag acknowledges it’s a tough balancing act for institutions to root out bad actors while also ensuring there’s no harm to those who may simply have operated in error.
“But it doesn’t serve anyone’s interest including the people who are accused, in dragging these things out for 5, 6, 8, or 10 years,” he said.
Lesne and Cassava: The Long and Winding Road
The investigations into the Lesne papers and the work underpinning Cassava Sciences’ therapy point to the difficulty of policing integrity and the potential fallout.
Lesne’s signature paper published in Nature in 2006 has been cited some 2300 times and is the fourth most-accessed article of 81,612 articles of a similar age in all journals tracked by Altimetrics.
Dr. Schrag, Dr. Bik, and others wrote to multiple journals asking them to investigate some 25 papers related to simufilam, including a 2012 Journal of Clinical Investigation article by Hoau-Yan Wang, PhD, the CUNY scientist whose work on simufilam has been questioned.
JCI Editor Elizabeth McNally pushed back stating in an editorial in 2022 that they, as whistleblowers, had potential conflicts and that they could be assisting short sellers who were seeking to profit by depressing Cassava’s stock price. Indeed, Dr. Schrag was initially hired by a law firm that was representing short sellers. Ms. McNally said that JCI would start requiring disclosures by whistleblowers.
Dr. Bik urged CUNY to investigate Dr. Wang in 2021 but was rebuffed. Then, in November 2023, a copy of CUNY’s final report on the Wang inquiry was leaked to Science. The university reported that Dr. Wang did not provide any original data or notebooks and that it found “long-standing and egregious misconduct in data management and record keeping by Dr. Wang,” wrote Dr. Bik in a blog post summarizing the investigation.
As of late 2023, 42 papers by Dr. Wang have earned PubPeer posts, seven have been retracted, and five have been marked with an Expression of Concern, wrote Dr. Bik.
Some have called for Cassava to stop its phase 3 studies of simufilam, but the company is proceeding, announcing in November 2023 that they have completed enrollment.
Misconduct Queries Underway at USC and Temple
Meanwhile, Dr. Schrag and Dr. Bik continue sleuthing. They are among a small group of whistleblowers who have filed a complaint with NIH about irregularities in the Zlokovic lab at USC. They allege that images were manipulated in dozens of papers, including some that inform the development of a stroke drug in phase 2 trials.
The inquiry goes well beyond stroke, said Dr. Schrag. Dr. Zlokovic “is one of the most influential scientists on Alzheimer’s scientists in the country,” Dr. Schrag said. The USC scientist is a leader on blood-brain barrier research.
USC is investigating “at some level,” he said. In a statement to this news organization, USC said that it “takes any allegations about research integrity very seriously.” The statement added, “Consistent with federal regulations and USC policies, this review must be kept confidential. As a result, we are unable to provide any further information.”
Mu Yang, PhD, assistant professor of neurobiology at Columbia University Medical Center in New York City, is also working on the Zlokovic investigation.
She calls herself an “accidental sleuth” who fell into the hobby after a graduate student asked her to help replicate a study by Temple University, Philadelphia, Pennsylvania, researcher Dominco Pratico, MD, of Alzheimer’s-like phenotype mice in the Morris Water Maze test. Dr. Yang, who runs the “behavior core” at Columbia — teaching and advising on how to run assays and collect and report data — could see right away that the Pratico data were “too perfect.”
She enlisted maze inventor Richard Morris to join her in a letter of concern to the journals that published Dr. Pratico’s work, all under the aegis of Springer Nature.
The publisher’s integrity team has since retracted four Pratico papers. Three were because of image abnormalities pointed out by Dr. Bik, who worked with Dr. Yang. One was because of “self-plagiarism.”
“The official retraction notes didn’t mention anything about data abnormality being a concern,” said Dr. Yang who says that questionable data is harder to prove than an image duplication or manipulation. And the papers remain available, although dozens of Practico papers have been flagged on PubPeer.
To Dr. Yang, images are the canary in the coalmine. “People don’t just fake western blots but then give real behavior data or give you fake behavior data but give you the most authentic Western Blots,” she said.
Dr. Pratico has now sued a graduate student who was a coauthor on the papers, according to the Philadelphia Inquirer.
The NIH’s ORI has requested that Temple University conduct an investigation, Dr. Yang said.
In a statement to this news organization, Temple said it “does not comment on internal investigations or personnel issues,” but that “allegations of research misconduct are reviewed and investigated centrally through Temple’s Office of the Vice President for Research in accordance with university policy and applicable federal regulations.”
A version of this article appeared on Medscape.com.
The book is yet to be closed, for instance, on whether a 2006 paper by Sylvain Lesne positing amyloid as a major cause of Alzheimer’s was based on fraudulent data. Suspicions about the paper were first raised in late 2021 by Matthew Schrag, MD, PhD, an assistant professor of neurology at Vanderbilt University Medical Center, Nashville, Tennessee.
Dr. Schrag also queried the work of a City University of New York (CUNY) researcher who proposed PT-125 (now simufilam) as a potential anti-amyloid for Alzheimer’s disease. Even though CUNY recently found “egregious” and potentially deliberate misconduct by that researcher, Cassava Sciences is continuing phase 3 trials of simufilam.
Now questions are being raised about work from the lab of Berislav V. Zlokovic, PhD, a prominent neuroscientist at the University of Southern California (USC), Los Angeles, California, and also about studies conducted under the aegis of Domenico Pratico, MD, the director of the Alzheimer’s Center at Temple University in Philadelphia, Pennsylvania.
Alzheimer’s has been a notoriously hard puzzle to solve. Despite decades of research, there are still no effective therapies and disparate theories about potential causes.
Dr. Schrag said he wouldn’t “attribute all the ills in this field” to misconduct, but it “is absolutely a part of the equation.” Some of the papers flagged for integrity issues “have been hugely influential,” he said in an interview. “Some of the labs that we’re talking about have really shaped how we’ve thought about this disease,” he said. “It’s hard to un-ring the bell.”
The fallout from fraud has a wide impact. Taxpayer dollars are wasted in the creation of the fraud and in attempts to replicate the failed experiment. Grad students — the workhorses of labs — waste time trying to repeat studies or may be bullied or intimidated into misconduct, said Elisabeth Bik, PhD, a former Stanford microbiologist who is now a full-time fraud investigator.
And there’s potential harm to patients. “There’s a lot of false hope being given to these people and their families,” Dr. Bik said in an interview.
Alzheimer’s Tempts With Big Rewards
There are big rewards for those who publish important papers on Alzheimer’s: More grants, publication in higher-impact journals, larger labs, and potentially, personal enrichment from commercialization of therapies.
“I can see that people are driven to cut corners or even to make up results, or even anything in between, to reach that goal,” said Dr. Bik.
It’s unclear whether misconduct and fraud are on the rise or just being detected more frequently.
“It’s very hard to say,” said Mike Rossner, PhD, president of Image Data Integrity. Institutions hire Dr. Rossner to help ferret out research integrity issues. He told this news organization that it’s likely detection is on the rise, given the increasing number of sleuths like Dr. Bik.
In 2002, Dr. Rossner began to screen all images submitted to the Journal of Clinical Biology in response to the new phenomenon of digital images and the advent of PhotoShop. “Very early on, we started to see problems in digital images that we would not have seen on a glossy printout,” Dr. Rossner said of his time as managing editor of the journal.
From 2002 to 2014, at least 25% of papers had an image that violated guidelines that prohibited the removal of spots or other blemishes (called “beautification”) with PhotoShop, which did not necessarily indicate fraud. They withdrew acceptance for 1% of papers because of image manipulations that affected data interpretation.
Dr. Bik noted that even if there is not a greater percentage of fraudulent papers in Alzheimer’s, “it would still be in absolute numbers a lot of papers that could be fraudulent,” given that Alzheimer’s research is well-funded with federal agencies alone providing $3.7 billion a year.
Images Key to Spotting Issues
Investigative sleuths often use the online forum PubPeer to initially raise questions about papers. The format gives the original authors a chance to comment on or defend their work. While some critiques are about data, most hone in on alleged duplications or manipulations of images, primarily by Western Blots.
The images are key, because “the images are the data,” said Dr. Rossner. “The words are the author’s interpretation of what they see in the images,” he said.
It’s also easier to spot a problem in an image. The raw data or an investigator’s notebooks aren’t needed, and there are artificial intelligence-driven software programs such as Proofig and Image Twin that help investigators spot duplicated images or cases in which an image might have been flipped or otherwise manipulated to make results look better.
Science recently announced that it would be using Proofig to screen images in all papers submitted to its six journals.
Using a screening tool is better than nothing, said Dr. Rossner who still relies on visual inspection, employing contrast or other features in PhotoShop to spot inconsistencies or duplications. But “none of those companies have disclosed how effective they are relative to visual screening, and that to me is very problematic,” he said.
“The tools are not going to catch everything,” said Dr. Bik.
Dr. Schrag agreed. “One of the things that we’re worried about is that a lot of the journals will simply adopt these tools as a screener and assume that that’s going to de-risk their publication portfolio,” he said, noting the high rate of misses.
Artificial Intelligence a Growing Concern
Artificial intelligence (AI) may also accelerate the amount of fraud and add to the difficulty of ferreting it out, said the investigators.
“I’m very worried about AI,” said Dr. Bik. Although AI-generated images and content may be rudimentary today, “next year it’s going to be much better,” she said. Going forward, it may be hard to distinguish between a real dataset and one that has been generated by AI, she said.
“The more closely AI can mimic authentic content, the more difficult it will be for publications to detect intentionally fraudulent submissions,” wrote Dror Kolodkin-Gal, PhD, the founder of Proofig, in an article for the Council of Science Editors.
Dr. Kolodkin-Gal said that AI may be especially prone to misuse by paper mills. Those operations submit fake or shoddy manuscripts to a journal on behalf of researchers seeking publication who pay the mills a fee. The Committee on Publication Ethics reported in 2022 that 2%-46% of papers submitted to journals may be from paper mills.
While it’s unclear whether AI is having any impact now, Dr. Rossner said, “I think I can be pretty confident in saying it is going to be a growing problem” as the tools become more sophisticated.
He sees parallels with the rise of PhotoShop and cites data from the National Institute of Health’s Office of Research Integrity (ORI) showing that in 1990, when PhotoShop was still new, 2% of cases referred to ORI involved image manipulation. By 2007, 70% of cases had image manipulation issues.
Journals, Institutions Need to Step Up More
Fraud may continue apace in part because investigations drag on for years, and in many cases, with a lack of consequences for the perpetrators, said the investigators. And, they say, journals and institutions haven’t devoted enough resources to prevent or investigate misconduct.
“A lot of editors did not even want to investigate because they just didn’t want to believe that there could be fraud in science,” said Dr. Bik of her experiences. “I hope that by now most journals at least should have realized that some proportion of the manuscripts that get sent to their journals is going to be fraud,” she said.
“The bulk of the journals seem like they don’t want to be bothered by this,” agreed Dr. Schrag, adding that “some have gone to great lengths to try to discourage people from bringing forward complaints.”
A big issue is that journals “don’t answer to any higher authority,” said Dr. Schrag. He believes that journals that repeatedly refuse to address integrity issues should be barred from publishing research produced with funds from the National Institutes of Health.
All the investigators said institutions and journals should hire forensic investigators. Relying on unpaid peer reviewers or editors to root out fraud is unrealistic, they said.
“You want to have specialized people with experience and be paid to do that as a full-time job,” said Dr. Bik, who is funded by speaking engagements and receives about $2300 a month through donations to her Patreon account.
Once a potential integrity issue is flagged, there is “an incredible conflict of interest in how these investigations are run,” said Dr. Schrag. “Institutions are asked to investigate their own faculty; they’re asked to investigate themselves.” That “creates the disincentive to move expeditiously,” said Dr. Schrag.
With the space of time, people who have committed fraud can throw out notebooks, delete data from servers, or even PhotoShop original photos so they match the manipulated ones that were submitted, Dr. Bik said.
Institutions could show they are serious about fraud by offering a “central, systematic universal screening of all image data going out of their institutions before submission to a journal,” said Dr. Rossner. But he knows only of a handful that do so. “I think research integrity offices have historically been very reactive, and they need to pivot and become proactive,” said Dr. Rossner.
Dr. Schrag wants to see stronger values within the research enterprise. “You have to build a culture where it’s absolutely anathema at a core level to violate these standards of research integrity,” he said. “We have this notion that we can push the process along faster and get to a grant and get to a paper and get to some short-term goal,” he said. “But the long-term goal in most of these cases is to cure a disease or to understand some biological mysteries. There’s no shortcut to getting there,” said Dr. Schrag.
There have been some high-profile consequences for research integrity failures, such as the 2023 resignation of Stanford University President Marc Tessier-Lavigne in the wake of findings that members of his lab — but not Tessier-Lavigne — engaged in data manipulation.
The process is often opaque, with investigations done in secrecy. “Consequences are not usually revealed, either,” said Dr. Rossner.
Dr. Schrag acknowledges it’s a tough balancing act for institutions to root out bad actors while also ensuring there’s no harm to those who may simply have operated in error.
“But it doesn’t serve anyone’s interest including the people who are accused, in dragging these things out for 5, 6, 8, or 10 years,” he said.
Lesne and Cassava: The Long and Winding Road
The investigations into the Lesne papers and the work underpinning Cassava Sciences’ therapy point to the difficulty of policing integrity and the potential fallout.
Lesne’s signature paper published in Nature in 2006 has been cited some 2300 times and is the fourth most-accessed article of 81,612 articles of a similar age in all journals tracked by Altimetrics.
Dr. Schrag, Dr. Bik, and others wrote to multiple journals asking them to investigate some 25 papers related to simufilam, including a 2012 Journal of Clinical Investigation article by Hoau-Yan Wang, PhD, the CUNY scientist whose work on simufilam has been questioned.
JCI Editor Elizabeth McNally pushed back stating in an editorial in 2022 that they, as whistleblowers, had potential conflicts and that they could be assisting short sellers who were seeking to profit by depressing Cassava’s stock price. Indeed, Dr. Schrag was initially hired by a law firm that was representing short sellers. Ms. McNally said that JCI would start requiring disclosures by whistleblowers.
Dr. Bik urged CUNY to investigate Dr. Wang in 2021 but was rebuffed. Then, in November 2023, a copy of CUNY’s final report on the Wang inquiry was leaked to Science. The university reported that Dr. Wang did not provide any original data or notebooks and that it found “long-standing and egregious misconduct in data management and record keeping by Dr. Wang,” wrote Dr. Bik in a blog post summarizing the investigation.
As of late 2023, 42 papers by Dr. Wang have earned PubPeer posts, seven have been retracted, and five have been marked with an Expression of Concern, wrote Dr. Bik.
Some have called for Cassava to stop its phase 3 studies of simufilam, but the company is proceeding, announcing in November 2023 that they have completed enrollment.
Misconduct Queries Underway at USC and Temple
Meanwhile, Dr. Schrag and Dr. Bik continue sleuthing. They are among a small group of whistleblowers who have filed a complaint with NIH about irregularities in the Zlokovic lab at USC. They allege that images were manipulated in dozens of papers, including some that inform the development of a stroke drug in phase 2 trials.
The inquiry goes well beyond stroke, said Dr. Schrag. Dr. Zlokovic “is one of the most influential scientists on Alzheimer’s scientists in the country,” Dr. Schrag said. The USC scientist is a leader on blood-brain barrier research.
USC is investigating “at some level,” he said. In a statement to this news organization, USC said that it “takes any allegations about research integrity very seriously.” The statement added, “Consistent with federal regulations and USC policies, this review must be kept confidential. As a result, we are unable to provide any further information.”
Mu Yang, PhD, assistant professor of neurobiology at Columbia University Medical Center in New York City, is also working on the Zlokovic investigation.
She calls herself an “accidental sleuth” who fell into the hobby after a graduate student asked her to help replicate a study by Temple University, Philadelphia, Pennsylvania, researcher Dominco Pratico, MD, of Alzheimer’s-like phenotype mice in the Morris Water Maze test. Dr. Yang, who runs the “behavior core” at Columbia — teaching and advising on how to run assays and collect and report data — could see right away that the Pratico data were “too perfect.”
She enlisted maze inventor Richard Morris to join her in a letter of concern to the journals that published Dr. Pratico’s work, all under the aegis of Springer Nature.
The publisher’s integrity team has since retracted four Pratico papers. Three were because of image abnormalities pointed out by Dr. Bik, who worked with Dr. Yang. One was because of “self-plagiarism.”
“The official retraction notes didn’t mention anything about data abnormality being a concern,” said Dr. Yang who says that questionable data is harder to prove than an image duplication or manipulation. And the papers remain available, although dozens of Practico papers have been flagged on PubPeer.
To Dr. Yang, images are the canary in the coalmine. “People don’t just fake western blots but then give real behavior data or give you fake behavior data but give you the most authentic Western Blots,” she said.
Dr. Pratico has now sued a graduate student who was a coauthor on the papers, according to the Philadelphia Inquirer.
The NIH’s ORI has requested that Temple University conduct an investigation, Dr. Yang said.
In a statement to this news organization, Temple said it “does not comment on internal investigations or personnel issues,” but that “allegations of research misconduct are reviewed and investigated centrally through Temple’s Office of the Vice President for Research in accordance with university policy and applicable federal regulations.”
A version of this article appeared on Medscape.com.
The book is yet to be closed, for instance, on whether a 2006 paper by Sylvain Lesne positing amyloid as a major cause of Alzheimer’s was based on fraudulent data. Suspicions about the paper were first raised in late 2021 by Matthew Schrag, MD, PhD, an assistant professor of neurology at Vanderbilt University Medical Center, Nashville, Tennessee.
Dr. Schrag also queried the work of a City University of New York (CUNY) researcher who proposed PT-125 (now simufilam) as a potential anti-amyloid for Alzheimer’s disease. Even though CUNY recently found “egregious” and potentially deliberate misconduct by that researcher, Cassava Sciences is continuing phase 3 trials of simufilam.
Now questions are being raised about work from the lab of Berislav V. Zlokovic, PhD, a prominent neuroscientist at the University of Southern California (USC), Los Angeles, California, and also about studies conducted under the aegis of Domenico Pratico, MD, the director of the Alzheimer’s Center at Temple University in Philadelphia, Pennsylvania.
Alzheimer’s has been a notoriously hard puzzle to solve. Despite decades of research, there are still no effective therapies and disparate theories about potential causes.
Dr. Schrag said he wouldn’t “attribute all the ills in this field” to misconduct, but it “is absolutely a part of the equation.” Some of the papers flagged for integrity issues “have been hugely influential,” he said in an interview. “Some of the labs that we’re talking about have really shaped how we’ve thought about this disease,” he said. “It’s hard to un-ring the bell.”
The fallout from fraud has a wide impact. Taxpayer dollars are wasted in the creation of the fraud and in attempts to replicate the failed experiment. Grad students — the workhorses of labs — waste time trying to repeat studies or may be bullied or intimidated into misconduct, said Elisabeth Bik, PhD, a former Stanford microbiologist who is now a full-time fraud investigator.
And there’s potential harm to patients. “There’s a lot of false hope being given to these people and their families,” Dr. Bik said in an interview.
Alzheimer’s Tempts With Big Rewards
There are big rewards for those who publish important papers on Alzheimer’s: More grants, publication in higher-impact journals, larger labs, and potentially, personal enrichment from commercialization of therapies.
“I can see that people are driven to cut corners or even to make up results, or even anything in between, to reach that goal,” said Dr. Bik.
It’s unclear whether misconduct and fraud are on the rise or just being detected more frequently.
“It’s very hard to say,” said Mike Rossner, PhD, president of Image Data Integrity. Institutions hire Dr. Rossner to help ferret out research integrity issues. He told this news organization that it’s likely detection is on the rise, given the increasing number of sleuths like Dr. Bik.
In 2002, Dr. Rossner began to screen all images submitted to the Journal of Clinical Biology in response to the new phenomenon of digital images and the advent of PhotoShop. “Very early on, we started to see problems in digital images that we would not have seen on a glossy printout,” Dr. Rossner said of his time as managing editor of the journal.
From 2002 to 2014, at least 25% of papers had an image that violated guidelines that prohibited the removal of spots or other blemishes (called “beautification”) with PhotoShop, which did not necessarily indicate fraud. They withdrew acceptance for 1% of papers because of image manipulations that affected data interpretation.
Dr. Bik noted that even if there is not a greater percentage of fraudulent papers in Alzheimer’s, “it would still be in absolute numbers a lot of papers that could be fraudulent,” given that Alzheimer’s research is well-funded with federal agencies alone providing $3.7 billion a year.
Images Key to Spotting Issues
Investigative sleuths often use the online forum PubPeer to initially raise questions about papers. The format gives the original authors a chance to comment on or defend their work. While some critiques are about data, most hone in on alleged duplications or manipulations of images, primarily by Western Blots.
The images are key, because “the images are the data,” said Dr. Rossner. “The words are the author’s interpretation of what they see in the images,” he said.
It’s also easier to spot a problem in an image. The raw data or an investigator’s notebooks aren’t needed, and there are artificial intelligence-driven software programs such as Proofig and Image Twin that help investigators spot duplicated images or cases in which an image might have been flipped or otherwise manipulated to make results look better.
Science recently announced that it would be using Proofig to screen images in all papers submitted to its six journals.
Using a screening tool is better than nothing, said Dr. Rossner who still relies on visual inspection, employing contrast or other features in PhotoShop to spot inconsistencies or duplications. But “none of those companies have disclosed how effective they are relative to visual screening, and that to me is very problematic,” he said.
“The tools are not going to catch everything,” said Dr. Bik.
Dr. Schrag agreed. “One of the things that we’re worried about is that a lot of the journals will simply adopt these tools as a screener and assume that that’s going to de-risk their publication portfolio,” he said, noting the high rate of misses.
Artificial Intelligence a Growing Concern
Artificial intelligence (AI) may also accelerate the amount of fraud and add to the difficulty of ferreting it out, said the investigators.
“I’m very worried about AI,” said Dr. Bik. Although AI-generated images and content may be rudimentary today, “next year it’s going to be much better,” she said. Going forward, it may be hard to distinguish between a real dataset and one that has been generated by AI, she said.
“The more closely AI can mimic authentic content, the more difficult it will be for publications to detect intentionally fraudulent submissions,” wrote Dror Kolodkin-Gal, PhD, the founder of Proofig, in an article for the Council of Science Editors.
Dr. Kolodkin-Gal said that AI may be especially prone to misuse by paper mills. Those operations submit fake or shoddy manuscripts to a journal on behalf of researchers seeking publication who pay the mills a fee. The Committee on Publication Ethics reported in 2022 that 2%-46% of papers submitted to journals may be from paper mills.
While it’s unclear whether AI is having any impact now, Dr. Rossner said, “I think I can be pretty confident in saying it is going to be a growing problem” as the tools become more sophisticated.
He sees parallels with the rise of PhotoShop and cites data from the National Institute of Health’s Office of Research Integrity (ORI) showing that in 1990, when PhotoShop was still new, 2% of cases referred to ORI involved image manipulation. By 2007, 70% of cases had image manipulation issues.
Journals, Institutions Need to Step Up More
Fraud may continue apace in part because investigations drag on for years, and in many cases, with a lack of consequences for the perpetrators, said the investigators. And, they say, journals and institutions haven’t devoted enough resources to prevent or investigate misconduct.
“A lot of editors did not even want to investigate because they just didn’t want to believe that there could be fraud in science,” said Dr. Bik of her experiences. “I hope that by now most journals at least should have realized that some proportion of the manuscripts that get sent to their journals is going to be fraud,” she said.
“The bulk of the journals seem like they don’t want to be bothered by this,” agreed Dr. Schrag, adding that “some have gone to great lengths to try to discourage people from bringing forward complaints.”
A big issue is that journals “don’t answer to any higher authority,” said Dr. Schrag. He believes that journals that repeatedly refuse to address integrity issues should be barred from publishing research produced with funds from the National Institutes of Health.
All the investigators said institutions and journals should hire forensic investigators. Relying on unpaid peer reviewers or editors to root out fraud is unrealistic, they said.
“You want to have specialized people with experience and be paid to do that as a full-time job,” said Dr. Bik, who is funded by speaking engagements and receives about $2300 a month through donations to her Patreon account.
Once a potential integrity issue is flagged, there is “an incredible conflict of interest in how these investigations are run,” said Dr. Schrag. “Institutions are asked to investigate their own faculty; they’re asked to investigate themselves.” That “creates the disincentive to move expeditiously,” said Dr. Schrag.
With the space of time, people who have committed fraud can throw out notebooks, delete data from servers, or even PhotoShop original photos so they match the manipulated ones that were submitted, Dr. Bik said.
Institutions could show they are serious about fraud by offering a “central, systematic universal screening of all image data going out of their institutions before submission to a journal,” said Dr. Rossner. But he knows only of a handful that do so. “I think research integrity offices have historically been very reactive, and they need to pivot and become proactive,” said Dr. Rossner.
Dr. Schrag wants to see stronger values within the research enterprise. “You have to build a culture where it’s absolutely anathema at a core level to violate these standards of research integrity,” he said. “We have this notion that we can push the process along faster and get to a grant and get to a paper and get to some short-term goal,” he said. “But the long-term goal in most of these cases is to cure a disease or to understand some biological mysteries. There’s no shortcut to getting there,” said Dr. Schrag.
There have been some high-profile consequences for research integrity failures, such as the 2023 resignation of Stanford University President Marc Tessier-Lavigne in the wake of findings that members of his lab — but not Tessier-Lavigne — engaged in data manipulation.
The process is often opaque, with investigations done in secrecy. “Consequences are not usually revealed, either,” said Dr. Rossner.
Dr. Schrag acknowledges it’s a tough balancing act for institutions to root out bad actors while also ensuring there’s no harm to those who may simply have operated in error.
“But it doesn’t serve anyone’s interest including the people who are accused, in dragging these things out for 5, 6, 8, or 10 years,” he said.
Lesne and Cassava: The Long and Winding Road
The investigations into the Lesne papers and the work underpinning Cassava Sciences’ therapy point to the difficulty of policing integrity and the potential fallout.
Lesne’s signature paper published in Nature in 2006 has been cited some 2300 times and is the fourth most-accessed article of 81,612 articles of a similar age in all journals tracked by Altimetrics.
Dr. Schrag, Dr. Bik, and others wrote to multiple journals asking them to investigate some 25 papers related to simufilam, including a 2012 Journal of Clinical Investigation article by Hoau-Yan Wang, PhD, the CUNY scientist whose work on simufilam has been questioned.
JCI Editor Elizabeth McNally pushed back stating in an editorial in 2022 that they, as whistleblowers, had potential conflicts and that they could be assisting short sellers who were seeking to profit by depressing Cassava’s stock price. Indeed, Dr. Schrag was initially hired by a law firm that was representing short sellers. Ms. McNally said that JCI would start requiring disclosures by whistleblowers.
Dr. Bik urged CUNY to investigate Dr. Wang in 2021 but was rebuffed. Then, in November 2023, a copy of CUNY’s final report on the Wang inquiry was leaked to Science. The university reported that Dr. Wang did not provide any original data or notebooks and that it found “long-standing and egregious misconduct in data management and record keeping by Dr. Wang,” wrote Dr. Bik in a blog post summarizing the investigation.
As of late 2023, 42 papers by Dr. Wang have earned PubPeer posts, seven have been retracted, and five have been marked with an Expression of Concern, wrote Dr. Bik.
Some have called for Cassava to stop its phase 3 studies of simufilam, but the company is proceeding, announcing in November 2023 that they have completed enrollment.
Misconduct Queries Underway at USC and Temple
Meanwhile, Dr. Schrag and Dr. Bik continue sleuthing. They are among a small group of whistleblowers who have filed a complaint with NIH about irregularities in the Zlokovic lab at USC. They allege that images were manipulated in dozens of papers, including some that inform the development of a stroke drug in phase 2 trials.
The inquiry goes well beyond stroke, said Dr. Schrag. Dr. Zlokovic “is one of the most influential scientists on Alzheimer’s scientists in the country,” Dr. Schrag said. The USC scientist is a leader on blood-brain barrier research.
USC is investigating “at some level,” he said. In a statement to this news organization, USC said that it “takes any allegations about research integrity very seriously.” The statement added, “Consistent with federal regulations and USC policies, this review must be kept confidential. As a result, we are unable to provide any further information.”
Mu Yang, PhD, assistant professor of neurobiology at Columbia University Medical Center in New York City, is also working on the Zlokovic investigation.
She calls herself an “accidental sleuth” who fell into the hobby after a graduate student asked her to help replicate a study by Temple University, Philadelphia, Pennsylvania, researcher Dominco Pratico, MD, of Alzheimer’s-like phenotype mice in the Morris Water Maze test. Dr. Yang, who runs the “behavior core” at Columbia — teaching and advising on how to run assays and collect and report data — could see right away that the Pratico data were “too perfect.”
She enlisted maze inventor Richard Morris to join her in a letter of concern to the journals that published Dr. Pratico’s work, all under the aegis of Springer Nature.
The publisher’s integrity team has since retracted four Pratico papers. Three were because of image abnormalities pointed out by Dr. Bik, who worked with Dr. Yang. One was because of “self-plagiarism.”
“The official retraction notes didn’t mention anything about data abnormality being a concern,” said Dr. Yang who says that questionable data is harder to prove than an image duplication or manipulation. And the papers remain available, although dozens of Practico papers have been flagged on PubPeer.
To Dr. Yang, images are the canary in the coalmine. “People don’t just fake western blots but then give real behavior data or give you fake behavior data but give you the most authentic Western Blots,” she said.
Dr. Pratico has now sued a graduate student who was a coauthor on the papers, according to the Philadelphia Inquirer.
The NIH’s ORI has requested that Temple University conduct an investigation, Dr. Yang said.
In a statement to this news organization, Temple said it “does not comment on internal investigations or personnel issues,” but that “allegations of research misconduct are reviewed and investigated centrally through Temple’s Office of the Vice President for Research in accordance with university policy and applicable federal regulations.”
A version of this article appeared on Medscape.com.
Service Dogs Lead to Fewer Seizures in Treatment-Resistant Epilepsy
, a new study showed.
Investigators speculate that the dogs may ease participants’ stress, leading to a decrease in seizure frequency, although they note this relationship warrants more study.
“Despite the development of numerous antiseizure medications over the past 15 years, up to 30% of people with epilepsy experience persistent seizures,” study author Valérie van Hezik-Wester, MSc, of Erasmus University Rotterdam, Rotterdam, the Netherlands, said in a press release.
The unpredictable nature of seizures is one of the most disabling aspects of epilepsy, Ms. Hezik-Wester added. Seizure dogs are trained to recognize seizures and respond when they occur.
“The tasks that these dogs perform, along with their companionship, may reduce seizure-related anxiety, also potentially reducing seizures caused by stress, the most common trigger for seizures,” she said.
The findings were published online in Neurology.
Improve Quality of Life
The study included 25 individuals with medically refractory epilepsy who had an average of two or more seizures per week, with seizure characteristics associated with a high risk for injuries or dysfunction. They also had to be able to care for a service dog.
All were observed under usual care, which included antiseizure medications, neurostimulation devices, and other supportive therapies. Participants could then choose to work with a service dog that had completed socialization and obedience training or be assigned a puppy they would train at home.
The median follow-up was 19 months with usual care and 12 months with the intervention. Participants recorded seizure activity in diaries and completed surveys on seizure severity, quality of life, and well-being every 3 months. Daily seizure counts were converted to obtain cumulative seizure frequencies over 28-day periods.
Of the 25 original participants, six discontinued trial participation before the end of follow-up, four of whom left the study due to difficulty with dog care and training.
Participants receiving usual care reported an average of 115 seizures per 28-day period, while those with trained service dogs recorded 73 seizures in the same period, or a 37% difference between groups.
Researchers found that participants had an average of 31% fewer seizures during the past 3 months when they had seizure dogs, with seven participants achieving a 50%-100% reduction in seizures.
The number of seizure-free days increased from an average of 11 days per 28-day period before receiving a service dog to 15 days after working with a dog.
Scores on the EQ-5D-5L, which measures perceived health problems, decreased on average by 2.5% per consecutive 28-day period with the intervention, reflecting an increase in generic health-related quality of life (0.975; 95% CI, 0.954-0.997).
“These findings show that seizure dogs can help people with epilepsy,” said Ms. van Hezik-Wester. “However, we also found that this partnership with seizure dogs might not be the right fit for everyone, as some people discontinued their participation in this program. More research is needed to better understand which people can benefit from working with seizure dogs.”
Enhanced Quality of Life
In an accompanying editorial, Amir Mbonde, MB, and Amy Crepeau, MD, of Mayo Clinic in Phoenix, Arizona, noted the findings add to a growing body of work on the effectiveness of service dogs in reducing seizure frequency.
“In addition to improved seizure control, the EPISODE study demonstrated the benefit of seizure dogs in enhancing the quality of life for patients, a crucial component of comprehensive epilepsy care,” they wrote.
In prior studies, seizure dogs have identified an odor that a person emits before a seizure in up to 97% of people, they noted, adding that this ability “offers immense clinical benefits to people with epilepsy, enhancing their independence, social engagement, employment opportunities, self-confidence, and thus quality of life.”
Study limitations include its small sample size and high attrition rate.
The study was funded by the Netherlands Organization for Health Research and Development and Innovatiefonds Zorgverzekeraars.
A version of this article appeared on Medscape.com.
, a new study showed.
Investigators speculate that the dogs may ease participants’ stress, leading to a decrease in seizure frequency, although they note this relationship warrants more study.
“Despite the development of numerous antiseizure medications over the past 15 years, up to 30% of people with epilepsy experience persistent seizures,” study author Valérie van Hezik-Wester, MSc, of Erasmus University Rotterdam, Rotterdam, the Netherlands, said in a press release.
The unpredictable nature of seizures is one of the most disabling aspects of epilepsy, Ms. Hezik-Wester added. Seizure dogs are trained to recognize seizures and respond when they occur.
“The tasks that these dogs perform, along with their companionship, may reduce seizure-related anxiety, also potentially reducing seizures caused by stress, the most common trigger for seizures,” she said.
The findings were published online in Neurology.
Improve Quality of Life
The study included 25 individuals with medically refractory epilepsy who had an average of two or more seizures per week, with seizure characteristics associated with a high risk for injuries or dysfunction. They also had to be able to care for a service dog.
All were observed under usual care, which included antiseizure medications, neurostimulation devices, and other supportive therapies. Participants could then choose to work with a service dog that had completed socialization and obedience training or be assigned a puppy they would train at home.
The median follow-up was 19 months with usual care and 12 months with the intervention. Participants recorded seizure activity in diaries and completed surveys on seizure severity, quality of life, and well-being every 3 months. Daily seizure counts were converted to obtain cumulative seizure frequencies over 28-day periods.
Of the 25 original participants, six discontinued trial participation before the end of follow-up, four of whom left the study due to difficulty with dog care and training.
Participants receiving usual care reported an average of 115 seizures per 28-day period, while those with trained service dogs recorded 73 seizures in the same period, or a 37% difference between groups.
Researchers found that participants had an average of 31% fewer seizures during the past 3 months when they had seizure dogs, with seven participants achieving a 50%-100% reduction in seizures.
The number of seizure-free days increased from an average of 11 days per 28-day period before receiving a service dog to 15 days after working with a dog.
Scores on the EQ-5D-5L, which measures perceived health problems, decreased on average by 2.5% per consecutive 28-day period with the intervention, reflecting an increase in generic health-related quality of life (0.975; 95% CI, 0.954-0.997).
“These findings show that seizure dogs can help people with epilepsy,” said Ms. van Hezik-Wester. “However, we also found that this partnership with seizure dogs might not be the right fit for everyone, as some people discontinued their participation in this program. More research is needed to better understand which people can benefit from working with seizure dogs.”
Enhanced Quality of Life
In an accompanying editorial, Amir Mbonde, MB, and Amy Crepeau, MD, of Mayo Clinic in Phoenix, Arizona, noted the findings add to a growing body of work on the effectiveness of service dogs in reducing seizure frequency.
“In addition to improved seizure control, the EPISODE study demonstrated the benefit of seizure dogs in enhancing the quality of life for patients, a crucial component of comprehensive epilepsy care,” they wrote.
In prior studies, seizure dogs have identified an odor that a person emits before a seizure in up to 97% of people, they noted, adding that this ability “offers immense clinical benefits to people with epilepsy, enhancing their independence, social engagement, employment opportunities, self-confidence, and thus quality of life.”
Study limitations include its small sample size and high attrition rate.
The study was funded by the Netherlands Organization for Health Research and Development and Innovatiefonds Zorgverzekeraars.
A version of this article appeared on Medscape.com.
, a new study showed.
Investigators speculate that the dogs may ease participants’ stress, leading to a decrease in seizure frequency, although they note this relationship warrants more study.
“Despite the development of numerous antiseizure medications over the past 15 years, up to 30% of people with epilepsy experience persistent seizures,” study author Valérie van Hezik-Wester, MSc, of Erasmus University Rotterdam, Rotterdam, the Netherlands, said in a press release.
The unpredictable nature of seizures is one of the most disabling aspects of epilepsy, Ms. Hezik-Wester added. Seizure dogs are trained to recognize seizures and respond when they occur.
“The tasks that these dogs perform, along with their companionship, may reduce seizure-related anxiety, also potentially reducing seizures caused by stress, the most common trigger for seizures,” she said.
The findings were published online in Neurology.
Improve Quality of Life
The study included 25 individuals with medically refractory epilepsy who had an average of two or more seizures per week, with seizure characteristics associated with a high risk for injuries or dysfunction. They also had to be able to care for a service dog.
All were observed under usual care, which included antiseizure medications, neurostimulation devices, and other supportive therapies. Participants could then choose to work with a service dog that had completed socialization and obedience training or be assigned a puppy they would train at home.
The median follow-up was 19 months with usual care and 12 months with the intervention. Participants recorded seizure activity in diaries and completed surveys on seizure severity, quality of life, and well-being every 3 months. Daily seizure counts were converted to obtain cumulative seizure frequencies over 28-day periods.
Of the 25 original participants, six discontinued trial participation before the end of follow-up, four of whom left the study due to difficulty with dog care and training.
Participants receiving usual care reported an average of 115 seizures per 28-day period, while those with trained service dogs recorded 73 seizures in the same period, or a 37% difference between groups.
Researchers found that participants had an average of 31% fewer seizures during the past 3 months when they had seizure dogs, with seven participants achieving a 50%-100% reduction in seizures.
The number of seizure-free days increased from an average of 11 days per 28-day period before receiving a service dog to 15 days after working with a dog.
Scores on the EQ-5D-5L, which measures perceived health problems, decreased on average by 2.5% per consecutive 28-day period with the intervention, reflecting an increase in generic health-related quality of life (0.975; 95% CI, 0.954-0.997).
“These findings show that seizure dogs can help people with epilepsy,” said Ms. van Hezik-Wester. “However, we also found that this partnership with seizure dogs might not be the right fit for everyone, as some people discontinued their participation in this program. More research is needed to better understand which people can benefit from working with seizure dogs.”
Enhanced Quality of Life
In an accompanying editorial, Amir Mbonde, MB, and Amy Crepeau, MD, of Mayo Clinic in Phoenix, Arizona, noted the findings add to a growing body of work on the effectiveness of service dogs in reducing seizure frequency.
“In addition to improved seizure control, the EPISODE study demonstrated the benefit of seizure dogs in enhancing the quality of life for patients, a crucial component of comprehensive epilepsy care,” they wrote.
In prior studies, seizure dogs have identified an odor that a person emits before a seizure in up to 97% of people, they noted, adding that this ability “offers immense clinical benefits to people with epilepsy, enhancing their independence, social engagement, employment opportunities, self-confidence, and thus quality of life.”
Study limitations include its small sample size and high attrition rate.
The study was funded by the Netherlands Organization for Health Research and Development and Innovatiefonds Zorgverzekeraars.
A version of this article appeared on Medscape.com.
FROM NEUROLOGY
New Data Support Viagra for Alzheimer’s Prevention
The large real-world analysis of patient data from two databases showed a 30%-54% reduced prevalence in Alzheimer’s disease among patients who took sildenafil (Viagra) than those who did not, after adjusting for potential confounding factors.
This observation was further supported by mechanistic studies showing decreased neurotoxic protein levels in brain cells exposed to the phosphodiesterase type 5 inhibitor (PDE5i).
“Our findings provide further weight to repurposing this existing FDA-approved drug as a novel treatment for Alzheimer’s, which is in great need of new therapies,” Feixiong Cheng, PhD, director of the Cleveland Clinic Genome Center, who led the research, said in a news release.
“We used artificial intelligence to integrate data across multiple domains which all indicated sildenafil’s potential against this devastating neurological disease,” Dr. Cheng noted.
The study was published online in the Journal of Alzheimer’s Disease.
Neuroprotective?
Using real-world patient data from the MarketScan Medicare Supplemental database (2012-2017) and the Clinformatics database (2007-2020), the researchers conducted propensity score-stratified analyses after adjusting for gender, age, race, and comorbidities.
They searched for all individuals with pharmacy claims for sildenafil or four comparator drugs — bumetanide, furosemide, spironolactone, and nifedipine. Results showed that sildenafil use was associated with reduced likelihood of Alzheimer’s disease relative to the control drugs.
For example, sildenafil use was associated with a 54% reduced incidence of Alzheimer’s disease in MarketScan (hazard ratio [HR], 0.46; 95% CI, 0.32-0.66) and a 30% reduced prevalence of Alzheimer’s disease in Clinformatics (HR, 0.70; 95% CI, 0.49-1.00) compared with spironolactone.
The findings support a study published earlier this year that found a potential protective effect of PDE5i treatment on Alzheimer’s disease risk.
However, this research and the current study are contradicted by another paper published in Brain Communications in late 2022 which showed no such link between ED meds and reduced Alzheimer’s disease risk.
The investigators also found that sildenafil reduces tau hyperphosphorylation (pTau181 and pTau205) in a dose-dependent manner in both familial and sporadic Alzheimer’s disease patient induced pluripotent stem cell (iPSC)-derived neurons.
They further demonstrated through RNA-sequencing data analysis that sildenafil specifically targets Alzheimer’s disease related genes and pathobiological pathways, mechanistically supporting the beneficial effect of sildenafil in Alzheimer’s disease.
“We believe our findings provide the evidence needed for clinical trials to further examine the potential effectiveness of sildenafil in patients with Alzheimer’s disease,” Dr. Cheng said.
The study was primarily supported by the National Institute on Aging (NIA) and the National Institute of Neurological Disorders and Stroke (NINDS). Dr. Cheng had no relevant disclosures.
A version of this article appeared on Medscape.com.
The large real-world analysis of patient data from two databases showed a 30%-54% reduced prevalence in Alzheimer’s disease among patients who took sildenafil (Viagra) than those who did not, after adjusting for potential confounding factors.
This observation was further supported by mechanistic studies showing decreased neurotoxic protein levels in brain cells exposed to the phosphodiesterase type 5 inhibitor (PDE5i).
“Our findings provide further weight to repurposing this existing FDA-approved drug as a novel treatment for Alzheimer’s, which is in great need of new therapies,” Feixiong Cheng, PhD, director of the Cleveland Clinic Genome Center, who led the research, said in a news release.
“We used artificial intelligence to integrate data across multiple domains which all indicated sildenafil’s potential against this devastating neurological disease,” Dr. Cheng noted.
The study was published online in the Journal of Alzheimer’s Disease.
Neuroprotective?
Using real-world patient data from the MarketScan Medicare Supplemental database (2012-2017) and the Clinformatics database (2007-2020), the researchers conducted propensity score-stratified analyses after adjusting for gender, age, race, and comorbidities.
They searched for all individuals with pharmacy claims for sildenafil or four comparator drugs — bumetanide, furosemide, spironolactone, and nifedipine. Results showed that sildenafil use was associated with reduced likelihood of Alzheimer’s disease relative to the control drugs.
For example, sildenafil use was associated with a 54% reduced incidence of Alzheimer’s disease in MarketScan (hazard ratio [HR], 0.46; 95% CI, 0.32-0.66) and a 30% reduced prevalence of Alzheimer’s disease in Clinformatics (HR, 0.70; 95% CI, 0.49-1.00) compared with spironolactone.
The findings support a study published earlier this year that found a potential protective effect of PDE5i treatment on Alzheimer’s disease risk.
However, this research and the current study are contradicted by another paper published in Brain Communications in late 2022 which showed no such link between ED meds and reduced Alzheimer’s disease risk.
The investigators also found that sildenafil reduces tau hyperphosphorylation (pTau181 and pTau205) in a dose-dependent manner in both familial and sporadic Alzheimer’s disease patient induced pluripotent stem cell (iPSC)-derived neurons.
They further demonstrated through RNA-sequencing data analysis that sildenafil specifically targets Alzheimer’s disease related genes and pathobiological pathways, mechanistically supporting the beneficial effect of sildenafil in Alzheimer’s disease.
“We believe our findings provide the evidence needed for clinical trials to further examine the potential effectiveness of sildenafil in patients with Alzheimer’s disease,” Dr. Cheng said.
The study was primarily supported by the National Institute on Aging (NIA) and the National Institute of Neurological Disorders and Stroke (NINDS). Dr. Cheng had no relevant disclosures.
A version of this article appeared on Medscape.com.
The large real-world analysis of patient data from two databases showed a 30%-54% reduced prevalence in Alzheimer’s disease among patients who took sildenafil (Viagra) than those who did not, after adjusting for potential confounding factors.
This observation was further supported by mechanistic studies showing decreased neurotoxic protein levels in brain cells exposed to the phosphodiesterase type 5 inhibitor (PDE5i).
“Our findings provide further weight to repurposing this existing FDA-approved drug as a novel treatment for Alzheimer’s, which is in great need of new therapies,” Feixiong Cheng, PhD, director of the Cleveland Clinic Genome Center, who led the research, said in a news release.
“We used artificial intelligence to integrate data across multiple domains which all indicated sildenafil’s potential against this devastating neurological disease,” Dr. Cheng noted.
The study was published online in the Journal of Alzheimer’s Disease.
Neuroprotective?
Using real-world patient data from the MarketScan Medicare Supplemental database (2012-2017) and the Clinformatics database (2007-2020), the researchers conducted propensity score-stratified analyses after adjusting for gender, age, race, and comorbidities.
They searched for all individuals with pharmacy claims for sildenafil or four comparator drugs — bumetanide, furosemide, spironolactone, and nifedipine. Results showed that sildenafil use was associated with reduced likelihood of Alzheimer’s disease relative to the control drugs.
For example, sildenafil use was associated with a 54% reduced incidence of Alzheimer’s disease in MarketScan (hazard ratio [HR], 0.46; 95% CI, 0.32-0.66) and a 30% reduced prevalence of Alzheimer’s disease in Clinformatics (HR, 0.70; 95% CI, 0.49-1.00) compared with spironolactone.
The findings support a study published earlier this year that found a potential protective effect of PDE5i treatment on Alzheimer’s disease risk.
However, this research and the current study are contradicted by another paper published in Brain Communications in late 2022 which showed no such link between ED meds and reduced Alzheimer’s disease risk.
The investigators also found that sildenafil reduces tau hyperphosphorylation (pTau181 and pTau205) in a dose-dependent manner in both familial and sporadic Alzheimer’s disease patient induced pluripotent stem cell (iPSC)-derived neurons.
They further demonstrated through RNA-sequencing data analysis that sildenafil specifically targets Alzheimer’s disease related genes and pathobiological pathways, mechanistically supporting the beneficial effect of sildenafil in Alzheimer’s disease.
“We believe our findings provide the evidence needed for clinical trials to further examine the potential effectiveness of sildenafil in patients with Alzheimer’s disease,” Dr. Cheng said.
The study was primarily supported by the National Institute on Aging (NIA) and the National Institute of Neurological Disorders and Stroke (NINDS). Dr. Cheng had no relevant disclosures.
A version of this article appeared on Medscape.com.
FROM THE JOURNAL OF ALZHEIMER’S RESEARCH
Air Pollution Tied to Greater Amyloid Burden in the Brain
TOPLINE:
, a new postmortem study showed.
METHODOLOGY:
- Investigators examined the brain tissue of 224 people living in the Atlanta area who agreed to donate their brains after death (average age of death, 76 years) for the presence of amyloid plaques and tau tangles.
- They also studied the amount of fine particulate matter < 2.5 microns (PM2.5) from traffic-related air pollution at participants’ home addresses at 1, 3, and 5 years before death.
- The presence of the APOE e4 gene was examined for evidence of any effect on the relationship between air pollution and evidence of Alzheimer’s disease (AD).
TAKEAWAY:
The average level of exposure in the year before death was 1.32 µg/m3 and 1.35 µg/m3 in the 3 years before death.
People with 1 µg/m3 higher PM2.5 exposure in the year before death were nearly twice as likely to have higher levels of plaques (odds ratio [OR], 1.92; 95% CI, 1.12-3.30), while those with higher exposure in the 3 years before death were 87% more likely to have higher levels of plaques (OR, 1.87; 95% CI, 1.01-3.17).
A little more than half (56%) of the sample were positive for the APOE e4 genotype, but the strongest association between pollution and neuropathology markers was for noncarriers of the genotype, although this relationship did not reach statistical significance.
IN PRACTICE:
“More research is needed to establish causality for the association between PM2.5 and AD, including epidemiologic and mechanistic studies. Future studies should also investigate the association between PM2.5 and other dementia-related pathologies, including cerebrovascular pathology,” the study authors wrote.
SOURCE:
Anke Hüls, PhD, of Emory University in Atlanta, led the study, which was published online on February 21, 2024, in Neurology.
LIMITATIONS:
The sample was not population-based but a convenience sample composed mostly of highly educated White participants.
DISCLOSURES:
The study was funded by the National Institute of Environmental Health Sciences, the Goizueta Alzheimer’s Disease Research Center, the National Institute on Aging, and the National Institutes of Health. There were no relevant disclosures.
A version of this article appeared on Medscape.com.
TOPLINE:
, a new postmortem study showed.
METHODOLOGY:
- Investigators examined the brain tissue of 224 people living in the Atlanta area who agreed to donate their brains after death (average age of death, 76 years) for the presence of amyloid plaques and tau tangles.
- They also studied the amount of fine particulate matter < 2.5 microns (PM2.5) from traffic-related air pollution at participants’ home addresses at 1, 3, and 5 years before death.
- The presence of the APOE e4 gene was examined for evidence of any effect on the relationship between air pollution and evidence of Alzheimer’s disease (AD).
TAKEAWAY:
The average level of exposure in the year before death was 1.32 µg/m3 and 1.35 µg/m3 in the 3 years before death.
People with 1 µg/m3 higher PM2.5 exposure in the year before death were nearly twice as likely to have higher levels of plaques (odds ratio [OR], 1.92; 95% CI, 1.12-3.30), while those with higher exposure in the 3 years before death were 87% more likely to have higher levels of plaques (OR, 1.87; 95% CI, 1.01-3.17).
A little more than half (56%) of the sample were positive for the APOE e4 genotype, but the strongest association between pollution and neuropathology markers was for noncarriers of the genotype, although this relationship did not reach statistical significance.
IN PRACTICE:
“More research is needed to establish causality for the association between PM2.5 and AD, including epidemiologic and mechanistic studies. Future studies should also investigate the association between PM2.5 and other dementia-related pathologies, including cerebrovascular pathology,” the study authors wrote.
SOURCE:
Anke Hüls, PhD, of Emory University in Atlanta, led the study, which was published online on February 21, 2024, in Neurology.
LIMITATIONS:
The sample was not population-based but a convenience sample composed mostly of highly educated White participants.
DISCLOSURES:
The study was funded by the National Institute of Environmental Health Sciences, the Goizueta Alzheimer’s Disease Research Center, the National Institute on Aging, and the National Institutes of Health. There were no relevant disclosures.
A version of this article appeared on Medscape.com.
TOPLINE:
, a new postmortem study showed.
METHODOLOGY:
- Investigators examined the brain tissue of 224 people living in the Atlanta area who agreed to donate their brains after death (average age of death, 76 years) for the presence of amyloid plaques and tau tangles.
- They also studied the amount of fine particulate matter < 2.5 microns (PM2.5) from traffic-related air pollution at participants’ home addresses at 1, 3, and 5 years before death.
- The presence of the APOE e4 gene was examined for evidence of any effect on the relationship between air pollution and evidence of Alzheimer’s disease (AD).
TAKEAWAY:
The average level of exposure in the year before death was 1.32 µg/m3 and 1.35 µg/m3 in the 3 years before death.
People with 1 µg/m3 higher PM2.5 exposure in the year before death were nearly twice as likely to have higher levels of plaques (odds ratio [OR], 1.92; 95% CI, 1.12-3.30), while those with higher exposure in the 3 years before death were 87% more likely to have higher levels of plaques (OR, 1.87; 95% CI, 1.01-3.17).
A little more than half (56%) of the sample were positive for the APOE e4 genotype, but the strongest association between pollution and neuropathology markers was for noncarriers of the genotype, although this relationship did not reach statistical significance.
IN PRACTICE:
“More research is needed to establish causality for the association between PM2.5 and AD, including epidemiologic and mechanistic studies. Future studies should also investigate the association between PM2.5 and other dementia-related pathologies, including cerebrovascular pathology,” the study authors wrote.
SOURCE:
Anke Hüls, PhD, of Emory University in Atlanta, led the study, which was published online on February 21, 2024, in Neurology.
LIMITATIONS:
The sample was not population-based but a convenience sample composed mostly of highly educated White participants.
DISCLOSURES:
The study was funded by the National Institute of Environmental Health Sciences, the Goizueta Alzheimer’s Disease Research Center, the National Institute on Aging, and the National Institutes of Health. There were no relevant disclosures.
A version of this article appeared on Medscape.com.
A New Biomarker of Brain Injury?
Posttraumatic headache (PTH) is associated with an increase in iron accumulation in certain brain regions , notably those involved in the pain network, early research shows.
The findings come on the heels of previous research showing patients with iron accumulation in certain brain regions don’t respond as well to treatment, study investigator, Simona Nikolova, PhD, assistant professor of neurology, Mayo Clinic, Phoenix, Arizona, told this news organization.
“This is really important, and doctors need to be aware of it. If you have a patient who is not responding to treatment, then you know what to look at,” she said.
The findings (Abstract #3379) will be presented on April 15 at the American Academy of Neurology (AAN) 2024 Annual Meeting.
Dose Effect
The study included 60 people with acute PTH due to mTBI. Most were White, and almost half had sustained a concussion due to a fall, with about 30% injured in a vehicle accident and a smaller number injured during a fight.
The mean number of lifetime mTBIs was 2.4, although participants had sustained as many as five or six and as few as one. The mean time from the most recent mTBI was 25 days, and the mean score on the Sport Concussion Assessment Tool (SCAT), which measures postconcussion symptom severity, was 29.
Most in the mTBI group (43) had migraine or probable migraine, and 14 had tension-type headaches. Mean headache frequency was 81%.
Researchers matched these patients with 60 controls without concussion or headache. Because iron accumulation is age-related, they tried to eliminate this covariant by pairing each participant with mTBI with an age- and sex-matched control.
All participants underwent a type of brain MRI known as T2* weighted sequence that can identify brain iron accumulation, a marker of neural injury.
Investigators found that the PTH group had significantly higher levels of iron accumulation in several areas of the brain, most of which are part of a “pain network” that includes about 63 areas of the brain, Dr. Nikolova said.
The study wasn’t designed to determine how much more iron accumulation mTBI patients had vs controls.
“We can’t say it was twice as much or three times as much; we can only say it was significant. Measuring concentrations in PTH patients and comparing that with controls is something we haven’t don’t yet,” said Dr. Nikolova.
Areas of the brain with increased iron accumulation, included the periaqueductal gray (PAG), anterior cingulated cortex, and supramarginal gyrus.
Research suggests patients with migraine who have elevated levels of iron in the PAG have a poorer response to botulinum toxin treatment. An earlier study by the same team showed a poorer response to the calcitonin gene-related peptide inhibitor erenumab in migraine patients with elevated iron in the PAG.
Researchers discovered that those with more lifetime TBIs had higher iron accumulation in the right gyrus rectus and right putamen vs those with fewer injuries and that headache frequency was associated with iron accumulation in the posterior corona radiata, bilateral temporal, right frontal, bilateral supplemental motor area, left fusiform, right hippocampus, sagittal striatum, and left cerebellum.
Surprising Result
The investigators also found a link between time since the most recent mTBI and iron accumulation in the bilateral temporal, right hippocampus, posterior and superior corona radiata, bilateral thalamus, right precuneus and cuneus, right lingual, and right cerebellum.
“The more time that passed since the concussion occurred, the more likely that people had higher iron levels,” said Dr. Nikolova.
It’s perhaps to be expected that the length of time since injury is linked to iron accumulation in the brain as iron accumulates over time. But even those whose injury was relatively recent had higher amounts of iron, which Dr. Nikolova said was “surprising.”
“We thought iron accumulates over time so we were thinking maybe we should be doing a longitudinal study to see what happens, but we see definite iron accumulation due to injury shortly after the injury,” she said.
There was no association between iron accumulation and symptom severity as measured by SCAT scores.
Questions Remain
It’s unclear why iron accumulates after an injury or what the ramifications are of this accumulation, Dr. Nikolova noted.
The imaging used in the study doesn’t distinguish between “bound” iron found after a hemorrhage and “free” iron in the brain. The free iron type has been shown to be increased after TBI and is “the stuff you should be afraid of,” Dr. Nikolova said.
Iron’s role in the metabolic process is important, but must be closely regulated, she said. Even a small accumulation can lead to oxidative stress.
Researchers are investigating whether the findings would be similar in mTBI but no headache and want to increase the number of study participants. A larger, more diverse sample would allow them to probe other questions, including whether iron accumulation is different in men and women. More data could also eventually lead to iron accumulation becoming a biomarker for concussion and PTH, Dr. Nikolova said.
“If you know a certain person has that biomarker, you might be able to administer a drug or some therapeutic procedure to prevent that iron from continuing to accumulate in the brain.”
Chelation drugs and other therapies may clear iron from the body but not necessarily from the brain.
Commenting on the study for this news organization, Frank Conidi, MD, director, Florida Center for Headache and Sports Neurology, Port St. Lucie , said that the study supports the hypothesis that concussion “is not a benign process for the brain, and the cumulative effect of repetitive head injury can result in permanent brain injury.”
He said that he found the accumulation of iron in cortical structures particularly interesting. This, he said, differs from most current research that suggests head trauma mainly results in damage to white matter tracts.
He prefers the term “concussion” over “mild traumatic brain injury” which was used in the study. “Recent guidelines, including some that I’ve been involved with, have defined mild traumatic brain injury as a more permanent process,” he said.
The study was supported by the US Department of Defense and National Institutes of Health. No relevant conflicts of interest were disclosed.
A version of this article appeared on Medscape.com.
Posttraumatic headache (PTH) is associated with an increase in iron accumulation in certain brain regions , notably those involved in the pain network, early research shows.
The findings come on the heels of previous research showing patients with iron accumulation in certain brain regions don’t respond as well to treatment, study investigator, Simona Nikolova, PhD, assistant professor of neurology, Mayo Clinic, Phoenix, Arizona, told this news organization.
“This is really important, and doctors need to be aware of it. If you have a patient who is not responding to treatment, then you know what to look at,” she said.
The findings (Abstract #3379) will be presented on April 15 at the American Academy of Neurology (AAN) 2024 Annual Meeting.
Dose Effect
The study included 60 people with acute PTH due to mTBI. Most were White, and almost half had sustained a concussion due to a fall, with about 30% injured in a vehicle accident and a smaller number injured during a fight.
The mean number of lifetime mTBIs was 2.4, although participants had sustained as many as five or six and as few as one. The mean time from the most recent mTBI was 25 days, and the mean score on the Sport Concussion Assessment Tool (SCAT), which measures postconcussion symptom severity, was 29.
Most in the mTBI group (43) had migraine or probable migraine, and 14 had tension-type headaches. Mean headache frequency was 81%.
Researchers matched these patients with 60 controls without concussion or headache. Because iron accumulation is age-related, they tried to eliminate this covariant by pairing each participant with mTBI with an age- and sex-matched control.
All participants underwent a type of brain MRI known as T2* weighted sequence that can identify brain iron accumulation, a marker of neural injury.
Investigators found that the PTH group had significantly higher levels of iron accumulation in several areas of the brain, most of which are part of a “pain network” that includes about 63 areas of the brain, Dr. Nikolova said.
The study wasn’t designed to determine how much more iron accumulation mTBI patients had vs controls.
“We can’t say it was twice as much or three times as much; we can only say it was significant. Measuring concentrations in PTH patients and comparing that with controls is something we haven’t don’t yet,” said Dr. Nikolova.
Areas of the brain with increased iron accumulation, included the periaqueductal gray (PAG), anterior cingulated cortex, and supramarginal gyrus.
Research suggests patients with migraine who have elevated levels of iron in the PAG have a poorer response to botulinum toxin treatment. An earlier study by the same team showed a poorer response to the calcitonin gene-related peptide inhibitor erenumab in migraine patients with elevated iron in the PAG.
Researchers discovered that those with more lifetime TBIs had higher iron accumulation in the right gyrus rectus and right putamen vs those with fewer injuries and that headache frequency was associated with iron accumulation in the posterior corona radiata, bilateral temporal, right frontal, bilateral supplemental motor area, left fusiform, right hippocampus, sagittal striatum, and left cerebellum.
Surprising Result
The investigators also found a link between time since the most recent mTBI and iron accumulation in the bilateral temporal, right hippocampus, posterior and superior corona radiata, bilateral thalamus, right precuneus and cuneus, right lingual, and right cerebellum.
“The more time that passed since the concussion occurred, the more likely that people had higher iron levels,” said Dr. Nikolova.
It’s perhaps to be expected that the length of time since injury is linked to iron accumulation in the brain as iron accumulates over time. But even those whose injury was relatively recent had higher amounts of iron, which Dr. Nikolova said was “surprising.”
“We thought iron accumulates over time so we were thinking maybe we should be doing a longitudinal study to see what happens, but we see definite iron accumulation due to injury shortly after the injury,” she said.
There was no association between iron accumulation and symptom severity as measured by SCAT scores.
Questions Remain
It’s unclear why iron accumulates after an injury or what the ramifications are of this accumulation, Dr. Nikolova noted.
The imaging used in the study doesn’t distinguish between “bound” iron found after a hemorrhage and “free” iron in the brain. The free iron type has been shown to be increased after TBI and is “the stuff you should be afraid of,” Dr. Nikolova said.
Iron’s role in the metabolic process is important, but must be closely regulated, she said. Even a small accumulation can lead to oxidative stress.
Researchers are investigating whether the findings would be similar in mTBI but no headache and want to increase the number of study participants. A larger, more diverse sample would allow them to probe other questions, including whether iron accumulation is different in men and women. More data could also eventually lead to iron accumulation becoming a biomarker for concussion and PTH, Dr. Nikolova said.
“If you know a certain person has that biomarker, you might be able to administer a drug or some therapeutic procedure to prevent that iron from continuing to accumulate in the brain.”
Chelation drugs and other therapies may clear iron from the body but not necessarily from the brain.
Commenting on the study for this news organization, Frank Conidi, MD, director, Florida Center for Headache and Sports Neurology, Port St. Lucie , said that the study supports the hypothesis that concussion “is not a benign process for the brain, and the cumulative effect of repetitive head injury can result in permanent brain injury.”
He said that he found the accumulation of iron in cortical structures particularly interesting. This, he said, differs from most current research that suggests head trauma mainly results in damage to white matter tracts.
He prefers the term “concussion” over “mild traumatic brain injury” which was used in the study. “Recent guidelines, including some that I’ve been involved with, have defined mild traumatic brain injury as a more permanent process,” he said.
The study was supported by the US Department of Defense and National Institutes of Health. No relevant conflicts of interest were disclosed.
A version of this article appeared on Medscape.com.
Posttraumatic headache (PTH) is associated with an increase in iron accumulation in certain brain regions , notably those involved in the pain network, early research shows.
The findings come on the heels of previous research showing patients with iron accumulation in certain brain regions don’t respond as well to treatment, study investigator, Simona Nikolova, PhD, assistant professor of neurology, Mayo Clinic, Phoenix, Arizona, told this news organization.
“This is really important, and doctors need to be aware of it. If you have a patient who is not responding to treatment, then you know what to look at,” she said.
The findings (Abstract #3379) will be presented on April 15 at the American Academy of Neurology (AAN) 2024 Annual Meeting.
Dose Effect
The study included 60 people with acute PTH due to mTBI. Most were White, and almost half had sustained a concussion due to a fall, with about 30% injured in a vehicle accident and a smaller number injured during a fight.
The mean number of lifetime mTBIs was 2.4, although participants had sustained as many as five or six and as few as one. The mean time from the most recent mTBI was 25 days, and the mean score on the Sport Concussion Assessment Tool (SCAT), which measures postconcussion symptom severity, was 29.
Most in the mTBI group (43) had migraine or probable migraine, and 14 had tension-type headaches. Mean headache frequency was 81%.
Researchers matched these patients with 60 controls without concussion or headache. Because iron accumulation is age-related, they tried to eliminate this covariant by pairing each participant with mTBI with an age- and sex-matched control.
All participants underwent a type of brain MRI known as T2* weighted sequence that can identify brain iron accumulation, a marker of neural injury.
Investigators found that the PTH group had significantly higher levels of iron accumulation in several areas of the brain, most of which are part of a “pain network” that includes about 63 areas of the brain, Dr. Nikolova said.
The study wasn’t designed to determine how much more iron accumulation mTBI patients had vs controls.
“We can’t say it was twice as much or three times as much; we can only say it was significant. Measuring concentrations in PTH patients and comparing that with controls is something we haven’t don’t yet,” said Dr. Nikolova.
Areas of the brain with increased iron accumulation, included the periaqueductal gray (PAG), anterior cingulated cortex, and supramarginal gyrus.
Research suggests patients with migraine who have elevated levels of iron in the PAG have a poorer response to botulinum toxin treatment. An earlier study by the same team showed a poorer response to the calcitonin gene-related peptide inhibitor erenumab in migraine patients with elevated iron in the PAG.
Researchers discovered that those with more lifetime TBIs had higher iron accumulation in the right gyrus rectus and right putamen vs those with fewer injuries and that headache frequency was associated with iron accumulation in the posterior corona radiata, bilateral temporal, right frontal, bilateral supplemental motor area, left fusiform, right hippocampus, sagittal striatum, and left cerebellum.
Surprising Result
The investigators also found a link between time since the most recent mTBI and iron accumulation in the bilateral temporal, right hippocampus, posterior and superior corona radiata, bilateral thalamus, right precuneus and cuneus, right lingual, and right cerebellum.
“The more time that passed since the concussion occurred, the more likely that people had higher iron levels,” said Dr. Nikolova.
It’s perhaps to be expected that the length of time since injury is linked to iron accumulation in the brain as iron accumulates over time. But even those whose injury was relatively recent had higher amounts of iron, which Dr. Nikolova said was “surprising.”
“We thought iron accumulates over time so we were thinking maybe we should be doing a longitudinal study to see what happens, but we see definite iron accumulation due to injury shortly after the injury,” she said.
There was no association between iron accumulation and symptom severity as measured by SCAT scores.
Questions Remain
It’s unclear why iron accumulates after an injury or what the ramifications are of this accumulation, Dr. Nikolova noted.
The imaging used in the study doesn’t distinguish between “bound” iron found after a hemorrhage and “free” iron in the brain. The free iron type has been shown to be increased after TBI and is “the stuff you should be afraid of,” Dr. Nikolova said.
Iron’s role in the metabolic process is important, but must be closely regulated, she said. Even a small accumulation can lead to oxidative stress.
Researchers are investigating whether the findings would be similar in mTBI but no headache and want to increase the number of study participants. A larger, more diverse sample would allow them to probe other questions, including whether iron accumulation is different in men and women. More data could also eventually lead to iron accumulation becoming a biomarker for concussion and PTH, Dr. Nikolova said.
“If you know a certain person has that biomarker, you might be able to administer a drug or some therapeutic procedure to prevent that iron from continuing to accumulate in the brain.”
Chelation drugs and other therapies may clear iron from the body but not necessarily from the brain.
Commenting on the study for this news organization, Frank Conidi, MD, director, Florida Center for Headache and Sports Neurology, Port St. Lucie , said that the study supports the hypothesis that concussion “is not a benign process for the brain, and the cumulative effect of repetitive head injury can result in permanent brain injury.”
He said that he found the accumulation of iron in cortical structures particularly interesting. This, he said, differs from most current research that suggests head trauma mainly results in damage to white matter tracts.
He prefers the term “concussion” over “mild traumatic brain injury” which was used in the study. “Recent guidelines, including some that I’ve been involved with, have defined mild traumatic brain injury as a more permanent process,” he said.
The study was supported by the US Department of Defense and National Institutes of Health. No relevant conflicts of interest were disclosed.
A version of this article appeared on Medscape.com.
Promising New Wearable Could Retrain the Brain After Stroke
A new and deceptively simple advance in chronic stroke treatment could be a vibrating glove.
Researchers at Stanford University and Georgia Tech have developed a wearable device that straps around the wrist and hand, delivering subtle vibrations (akin to a vibrating cellphone) that may relieve spasticity as well as or better than the standard Botox injections.
“The vibro-tactile stimulation can be used at home, and we’re hoping it can be relatively low cost,” said senior study author Allison Okamura, PhD, a mechanical engineer at Stanford University, Stanford, California.
For now, the device is available only to clinical trial patients. But the researchers hope to get the glove into — or rather onto — more patients’ hands within a few years. A recent grant from the National Science Foundation’s Convergence Accelerator program could help pave the way to a commercial product. The team also hopes to expand access in the meantime through larger clinical trials with patients in additional locations.
The work builds on accumulating research exploring vibration and other stimulation therapies as treatments for neurological conditions. Other vibrating gloves have helped reduce involuntary movement for patients with Parkinson’s. And the University of Kansas Medical Center, Kansas City, will soon trial the Food and Drug Administration–approved vagal nerve stimulator, an implantable device intended to treat motor function in stroke survivors. Dr. Okamura noted that devices use “different types of vibration patterns and intensities,” depending on the disease state they target.
Spasticity often develops or worsens months after a stroke. By then, patients may have run out of insurance coverage for rehabilitation. And the effectiveness of Botox injections can “wear out over time,” Dr. Okamura said.
In a clinical trial, patients wore the device for 3 hours a day for 8 weeks, while doing their usual activities. The researchers continued testing their spasticity for 2 more weeks.
How Vibro-Tactile Stimulation May Rewire the Brain
The device originated at Georgia Tech, where Dr. Okamura’s postdoctoral research fellow Caitlyn Seim, PhD, was using vibro-tactile stimulation (VTS) to teach people skills, such as playing the piano, using touch-feedback training. The team decided to target spasticity, which VTS had helped in previousstudies of in-clinic (non-wearable) devices.
How does the device work? The researchers point to neuroplasticity, the ability of neurons to create new synapses or strengthen existing ones in the brain.
“The stimulation is sending additional sensory signals to the brain, which helps the brain interpret and reconnect any lost circuits,” Dr. Okamura said.
Spasticity is driven by “an imbalance in the excitatory drive to the muscles,” she continued. This can lead to worsening contractions, until a hand closes into a fist or a foot curls up. (The team has also done preliminary research on a similar device for foot spasticity, which they hope to continue developing.) Previous studies by Okamura and others suggest that vibration stimulation may prevent these contractions, both in the short and long term.
“Immediately, we do see some softening of the muscles,” Dr. Okamura said. “But in our longer-term study, where we compared to Botox, I also think that the vibration may be retraining the brain to send inhibitory signals. And that can restore balance that’s lost due to the damaged neural circuits from a stroke.”
When the team did a separate study comparing the effects of muscle and skin stimulation, they hypothesized that the vibration could be having a biomechanical effect on the muscle. Instead, they found that stimulating the skin had a greater impact — a “somewhat unexpected” result, Dr. Okamura said. That led them to the brain.
“Stimulating the skin is really about creating sensory signals that get sent to the brain,” Dr. Okamura said, “which is why we think it’s actually a brain-retraining effect and not a direct biomechanical effect.”
What’s Next?
The researchers are seeking funding for longer-term clinical studies to find out if effects persist beyond 2 weeks. They also want to explore how long and often patients should wear the glove for best results.
The researchers also want to study how movement might enhance the effects of the device.
“One of the treatments for spasticity — medications aside, this vibration machine aside — is more exercise, more passive range of motion,” said Oluwole O. Awosika, MD, associate professor at the University of Cincinnati College of Medicine, who was not involved in the study. “It would have been nice to have a control group that didn’t get any of this stimulation or that was only encouraged to do 3 hours of movement a day. What would the difference be?”
Dr. Awosika also wondered how easy it would be for stroke patients without in-home assistance to use the device. “Sometimes wearing these devices requires someone to put it on,” he said.
Of course, if all goes well, patients wouldn’t have to deal with that forever. “The dream would be that you reach true rehabilitation, which is no longer needing the device,” Dr. Okamura said.
A version of this article appeared on Medscape.com.
A new and deceptively simple advance in chronic stroke treatment could be a vibrating glove.
Researchers at Stanford University and Georgia Tech have developed a wearable device that straps around the wrist and hand, delivering subtle vibrations (akin to a vibrating cellphone) that may relieve spasticity as well as or better than the standard Botox injections.
“The vibro-tactile stimulation can be used at home, and we’re hoping it can be relatively low cost,” said senior study author Allison Okamura, PhD, a mechanical engineer at Stanford University, Stanford, California.
For now, the device is available only to clinical trial patients. But the researchers hope to get the glove into — or rather onto — more patients’ hands within a few years. A recent grant from the National Science Foundation’s Convergence Accelerator program could help pave the way to a commercial product. The team also hopes to expand access in the meantime through larger clinical trials with patients in additional locations.
The work builds on accumulating research exploring vibration and other stimulation therapies as treatments for neurological conditions. Other vibrating gloves have helped reduce involuntary movement for patients with Parkinson’s. And the University of Kansas Medical Center, Kansas City, will soon trial the Food and Drug Administration–approved vagal nerve stimulator, an implantable device intended to treat motor function in stroke survivors. Dr. Okamura noted that devices use “different types of vibration patterns and intensities,” depending on the disease state they target.
Spasticity often develops or worsens months after a stroke. By then, patients may have run out of insurance coverage for rehabilitation. And the effectiveness of Botox injections can “wear out over time,” Dr. Okamura said.
In a clinical trial, patients wore the device for 3 hours a day for 8 weeks, while doing their usual activities. The researchers continued testing their spasticity for 2 more weeks.
How Vibro-Tactile Stimulation May Rewire the Brain
The device originated at Georgia Tech, where Dr. Okamura’s postdoctoral research fellow Caitlyn Seim, PhD, was using vibro-tactile stimulation (VTS) to teach people skills, such as playing the piano, using touch-feedback training. The team decided to target spasticity, which VTS had helped in previousstudies of in-clinic (non-wearable) devices.
How does the device work? The researchers point to neuroplasticity, the ability of neurons to create new synapses or strengthen existing ones in the brain.
“The stimulation is sending additional sensory signals to the brain, which helps the brain interpret and reconnect any lost circuits,” Dr. Okamura said.
Spasticity is driven by “an imbalance in the excitatory drive to the muscles,” she continued. This can lead to worsening contractions, until a hand closes into a fist or a foot curls up. (The team has also done preliminary research on a similar device for foot spasticity, which they hope to continue developing.) Previous studies by Okamura and others suggest that vibration stimulation may prevent these contractions, both in the short and long term.
“Immediately, we do see some softening of the muscles,” Dr. Okamura said. “But in our longer-term study, where we compared to Botox, I also think that the vibration may be retraining the brain to send inhibitory signals. And that can restore balance that’s lost due to the damaged neural circuits from a stroke.”
When the team did a separate study comparing the effects of muscle and skin stimulation, they hypothesized that the vibration could be having a biomechanical effect on the muscle. Instead, they found that stimulating the skin had a greater impact — a “somewhat unexpected” result, Dr. Okamura said. That led them to the brain.
“Stimulating the skin is really about creating sensory signals that get sent to the brain,” Dr. Okamura said, “which is why we think it’s actually a brain-retraining effect and not a direct biomechanical effect.”
What’s Next?
The researchers are seeking funding for longer-term clinical studies to find out if effects persist beyond 2 weeks. They also want to explore how long and often patients should wear the glove for best results.
The researchers also want to study how movement might enhance the effects of the device.
“One of the treatments for spasticity — medications aside, this vibration machine aside — is more exercise, more passive range of motion,” said Oluwole O. Awosika, MD, associate professor at the University of Cincinnati College of Medicine, who was not involved in the study. “It would have been nice to have a control group that didn’t get any of this stimulation or that was only encouraged to do 3 hours of movement a day. What would the difference be?”
Dr. Awosika also wondered how easy it would be for stroke patients without in-home assistance to use the device. “Sometimes wearing these devices requires someone to put it on,” he said.
Of course, if all goes well, patients wouldn’t have to deal with that forever. “The dream would be that you reach true rehabilitation, which is no longer needing the device,” Dr. Okamura said.
A version of this article appeared on Medscape.com.
A new and deceptively simple advance in chronic stroke treatment could be a vibrating glove.
Researchers at Stanford University and Georgia Tech have developed a wearable device that straps around the wrist and hand, delivering subtle vibrations (akin to a vibrating cellphone) that may relieve spasticity as well as or better than the standard Botox injections.
“The vibro-tactile stimulation can be used at home, and we’re hoping it can be relatively low cost,” said senior study author Allison Okamura, PhD, a mechanical engineer at Stanford University, Stanford, California.
For now, the device is available only to clinical trial patients. But the researchers hope to get the glove into — or rather onto — more patients’ hands within a few years. A recent grant from the National Science Foundation’s Convergence Accelerator program could help pave the way to a commercial product. The team also hopes to expand access in the meantime through larger clinical trials with patients in additional locations.
The work builds on accumulating research exploring vibration and other stimulation therapies as treatments for neurological conditions. Other vibrating gloves have helped reduce involuntary movement for patients with Parkinson’s. And the University of Kansas Medical Center, Kansas City, will soon trial the Food and Drug Administration–approved vagal nerve stimulator, an implantable device intended to treat motor function in stroke survivors. Dr. Okamura noted that devices use “different types of vibration patterns and intensities,” depending on the disease state they target.
Spasticity often develops or worsens months after a stroke. By then, patients may have run out of insurance coverage for rehabilitation. And the effectiveness of Botox injections can “wear out over time,” Dr. Okamura said.
In a clinical trial, patients wore the device for 3 hours a day for 8 weeks, while doing their usual activities. The researchers continued testing their spasticity for 2 more weeks.
How Vibro-Tactile Stimulation May Rewire the Brain
The device originated at Georgia Tech, where Dr. Okamura’s postdoctoral research fellow Caitlyn Seim, PhD, was using vibro-tactile stimulation (VTS) to teach people skills, such as playing the piano, using touch-feedback training. The team decided to target spasticity, which VTS had helped in previousstudies of in-clinic (non-wearable) devices.
How does the device work? The researchers point to neuroplasticity, the ability of neurons to create new synapses or strengthen existing ones in the brain.
“The stimulation is sending additional sensory signals to the brain, which helps the brain interpret and reconnect any lost circuits,” Dr. Okamura said.
Spasticity is driven by “an imbalance in the excitatory drive to the muscles,” she continued. This can lead to worsening contractions, until a hand closes into a fist or a foot curls up. (The team has also done preliminary research on a similar device for foot spasticity, which they hope to continue developing.) Previous studies by Okamura and others suggest that vibration stimulation may prevent these contractions, both in the short and long term.
“Immediately, we do see some softening of the muscles,” Dr. Okamura said. “But in our longer-term study, where we compared to Botox, I also think that the vibration may be retraining the brain to send inhibitory signals. And that can restore balance that’s lost due to the damaged neural circuits from a stroke.”
When the team did a separate study comparing the effects of muscle and skin stimulation, they hypothesized that the vibration could be having a biomechanical effect on the muscle. Instead, they found that stimulating the skin had a greater impact — a “somewhat unexpected” result, Dr. Okamura said. That led them to the brain.
“Stimulating the skin is really about creating sensory signals that get sent to the brain,” Dr. Okamura said, “which is why we think it’s actually a brain-retraining effect and not a direct biomechanical effect.”
What’s Next?
The researchers are seeking funding for longer-term clinical studies to find out if effects persist beyond 2 weeks. They also want to explore how long and often patients should wear the glove for best results.
The researchers also want to study how movement might enhance the effects of the device.
“One of the treatments for spasticity — medications aside, this vibration machine aside — is more exercise, more passive range of motion,” said Oluwole O. Awosika, MD, associate professor at the University of Cincinnati College of Medicine, who was not involved in the study. “It would have been nice to have a control group that didn’t get any of this stimulation or that was only encouraged to do 3 hours of movement a day. What would the difference be?”
Dr. Awosika also wondered how easy it would be for stroke patients without in-home assistance to use the device. “Sometimes wearing these devices requires someone to put it on,” he said.
Of course, if all goes well, patients wouldn’t have to deal with that forever. “The dream would be that you reach true rehabilitation, which is no longer needing the device,” Dr. Okamura said.
A version of this article appeared on Medscape.com.
‘Remarkable’ Study Tracks Timeline of Biomarker Changes 20 Years Before Alzheimer’s disease
, something that hasn’t previously been extensively investigated in longitudinal studies.
By analyzing cerebral spinal fluid (CSF), as well as cognitive and brain imaging assessments conducted every few years for two decades, researchers were able to plot the course of changing levels of amyloid-beta 42 (Abeta42), phosphorylated tau 181 (p-tau181), and neurofilament light chain (NfL) in adults with Alzheimer’s disease and mark when those levels began to deviate from those of adults without Alzheimer’s disease.
Levels of Abeta42 in CSF and the ratio of Abeta42 to Abeta40 in people who developed Alzheimer’s disease diverged from those of peers who remained cognitively normal at 18 years and 14 years, respectively, before clinical signs of disease appeared.
The level of p-tau181 in CSF increased 11 years before disease onset, and NfL levels, a measure of neurodegeneration, increased 9 years before diagnosis.
These changes were followed by hippocampal atrophy and cognitive decline a few years later.
The results also show “an apparent accelerated change in concentrations of CSF biomarkers followed by a slowing of this change up to the time of diagnosis,” report the authors, led by Jianping Jia, MD, PhD, with the Innovation Center for Neurological Disorders, Xuanwu Hospital, Capital Medical University, Beijing, China.
The study was published online in The New England Journal of Medicine.
Time Course of Biomarker Changes
Dr. Jia and colleagues conducted a nested case-control study within the China Cognition and Aging Study (COAST). They matched 648 adults who developed Alzheimer’s disease to 648 who remained cognitively normal. CSF, cognitive, and brain imaging assessments were performed every 2-3 years for a median of about 20 years.
Within both groups, men slightly outnumbered women. At baseline, CSF biomarker levels, cognitive scores, and hippocampal volumes were similar in the two groups. Adults who developed Alzheimer’s disease were more likely than their matched controls to be carriers of the APOE epsilon-4 allele (37% vs 20%).
In terms of CSF Abeta42, the level of this biomarker in those who developed Alzheimer’s disease diverged from the level in controls an estimated 18 years before clinical diagnosis. At that time, the level was lower by a mean 59.13 pg/mL in the Alzheimer’s disease group.
A difference in the ratio of CSF Abeta42 to Abeta40 between the two groups appeared an estimated 14 years before the diagnosis of Alzheimer’s disease (difference in mean values, −0.01 pg/mL).
Differences between the two groups in CSF p-tau181 and total tau concentrations were apparent roughly 11 and 10 years before diagnosis, respectively. At those times, the mean differences in p-tau181 and total tau concentrations were 7.10 pg/mL and 87.10 pg/mL, respectively.
In terms of NfL, a difference between the groups was observed 9 years before diagnosis, with its trajectory progressively deviating from the concentrations observed in cognitively normal groups at that time, to a final mean difference in NfL of 228.29 pg/mL.
Bilateral hippocampal volume decreased with age in both groups. However, the decrease began to differ between the two groups 8 years before Alzheimer’s disease diagnosis, at which time volume was lower by 358.94 mm3 in the Alzheimer’s disease group compared with the control group.
Average Clinical Dementia Rating–Sum of Boxes (CDR-SB) scores in the Alzheimer’s disease group began to worsen compared with the control group at about 6 years before diagnosis.
As Alzheimer’s disease progressed, changes in CSF biomarkers increased before reaching a plateau.
Important Contribution
In a linked editorial, Richard Mayeux, MD, Department of Neurology, Columbia University, New York, said the importance of this work “cannot be overstated. Knowledge of the timing of these physiological events is critical to provide clinicians with useful starting points for prevention and therapeutic strategies.”
Dr. Mayeux said this “remarkable” longitudinal study spanning 2 decades “not only confirms the hypotheses of previous investigators but extends and validates the sequence of changes” in sporadic Alzheimer’s disease.
Dr. Mayeux acknowledged that one might consider the finding in this study to be limited owing to the inclusion of only individuals of Han Chinese ancestry.
However, longitudinal studies of plasma biomarkers in individuals of Asian, European, African, and Hispanic ancestry have shown similar trends in biomarker changes preceding the onset of Alzheimer’s disease, he noted.
“Ethnic variation in these biomarkers is known, but that fact does not lessen the effect of the results reported. It merely highlights that similar studies must continue and must be inclusive of other groups,” Dr. Mayeux concluded.
The study had no commercial funding. Disclosures for authors and editorialist are available at NEJM.org.
A version of this article appeared on Medscape.com.
, something that hasn’t previously been extensively investigated in longitudinal studies.
By analyzing cerebral spinal fluid (CSF), as well as cognitive and brain imaging assessments conducted every few years for two decades, researchers were able to plot the course of changing levels of amyloid-beta 42 (Abeta42), phosphorylated tau 181 (p-tau181), and neurofilament light chain (NfL) in adults with Alzheimer’s disease and mark when those levels began to deviate from those of adults without Alzheimer’s disease.
Levels of Abeta42 in CSF and the ratio of Abeta42 to Abeta40 in people who developed Alzheimer’s disease diverged from those of peers who remained cognitively normal at 18 years and 14 years, respectively, before clinical signs of disease appeared.
The level of p-tau181 in CSF increased 11 years before disease onset, and NfL levels, a measure of neurodegeneration, increased 9 years before diagnosis.
These changes were followed by hippocampal atrophy and cognitive decline a few years later.
The results also show “an apparent accelerated change in concentrations of CSF biomarkers followed by a slowing of this change up to the time of diagnosis,” report the authors, led by Jianping Jia, MD, PhD, with the Innovation Center for Neurological Disorders, Xuanwu Hospital, Capital Medical University, Beijing, China.
The study was published online in The New England Journal of Medicine.
Time Course of Biomarker Changes
Dr. Jia and colleagues conducted a nested case-control study within the China Cognition and Aging Study (COAST). They matched 648 adults who developed Alzheimer’s disease to 648 who remained cognitively normal. CSF, cognitive, and brain imaging assessments were performed every 2-3 years for a median of about 20 years.
Within both groups, men slightly outnumbered women. At baseline, CSF biomarker levels, cognitive scores, and hippocampal volumes were similar in the two groups. Adults who developed Alzheimer’s disease were more likely than their matched controls to be carriers of the APOE epsilon-4 allele (37% vs 20%).
In terms of CSF Abeta42, the level of this biomarker in those who developed Alzheimer’s disease diverged from the level in controls an estimated 18 years before clinical diagnosis. At that time, the level was lower by a mean 59.13 pg/mL in the Alzheimer’s disease group.
A difference in the ratio of CSF Abeta42 to Abeta40 between the two groups appeared an estimated 14 years before the diagnosis of Alzheimer’s disease (difference in mean values, −0.01 pg/mL).
Differences between the two groups in CSF p-tau181 and total tau concentrations were apparent roughly 11 and 10 years before diagnosis, respectively. At those times, the mean differences in p-tau181 and total tau concentrations were 7.10 pg/mL and 87.10 pg/mL, respectively.
In terms of NfL, a difference between the groups was observed 9 years before diagnosis, with its trajectory progressively deviating from the concentrations observed in cognitively normal groups at that time, to a final mean difference in NfL of 228.29 pg/mL.
Bilateral hippocampal volume decreased with age in both groups. However, the decrease began to differ between the two groups 8 years before Alzheimer’s disease diagnosis, at which time volume was lower by 358.94 mm3 in the Alzheimer’s disease group compared with the control group.
Average Clinical Dementia Rating–Sum of Boxes (CDR-SB) scores in the Alzheimer’s disease group began to worsen compared with the control group at about 6 years before diagnosis.
As Alzheimer’s disease progressed, changes in CSF biomarkers increased before reaching a plateau.
Important Contribution
In a linked editorial, Richard Mayeux, MD, Department of Neurology, Columbia University, New York, said the importance of this work “cannot be overstated. Knowledge of the timing of these physiological events is critical to provide clinicians with useful starting points for prevention and therapeutic strategies.”
Dr. Mayeux said this “remarkable” longitudinal study spanning 2 decades “not only confirms the hypotheses of previous investigators but extends and validates the sequence of changes” in sporadic Alzheimer’s disease.
Dr. Mayeux acknowledged that one might consider the finding in this study to be limited owing to the inclusion of only individuals of Han Chinese ancestry.
However, longitudinal studies of plasma biomarkers in individuals of Asian, European, African, and Hispanic ancestry have shown similar trends in biomarker changes preceding the onset of Alzheimer’s disease, he noted.
“Ethnic variation in these biomarkers is known, but that fact does not lessen the effect of the results reported. It merely highlights that similar studies must continue and must be inclusive of other groups,” Dr. Mayeux concluded.
The study had no commercial funding. Disclosures for authors and editorialist are available at NEJM.org.
A version of this article appeared on Medscape.com.
, something that hasn’t previously been extensively investigated in longitudinal studies.
By analyzing cerebral spinal fluid (CSF), as well as cognitive and brain imaging assessments conducted every few years for two decades, researchers were able to plot the course of changing levels of amyloid-beta 42 (Abeta42), phosphorylated tau 181 (p-tau181), and neurofilament light chain (NfL) in adults with Alzheimer’s disease and mark when those levels began to deviate from those of adults without Alzheimer’s disease.
Levels of Abeta42 in CSF and the ratio of Abeta42 to Abeta40 in people who developed Alzheimer’s disease diverged from those of peers who remained cognitively normal at 18 years and 14 years, respectively, before clinical signs of disease appeared.
The level of p-tau181 in CSF increased 11 years before disease onset, and NfL levels, a measure of neurodegeneration, increased 9 years before diagnosis.
These changes were followed by hippocampal atrophy and cognitive decline a few years later.
The results also show “an apparent accelerated change in concentrations of CSF biomarkers followed by a slowing of this change up to the time of diagnosis,” report the authors, led by Jianping Jia, MD, PhD, with the Innovation Center for Neurological Disorders, Xuanwu Hospital, Capital Medical University, Beijing, China.
The study was published online in The New England Journal of Medicine.
Time Course of Biomarker Changes
Dr. Jia and colleagues conducted a nested case-control study within the China Cognition and Aging Study (COAST). They matched 648 adults who developed Alzheimer’s disease to 648 who remained cognitively normal. CSF, cognitive, and brain imaging assessments were performed every 2-3 years for a median of about 20 years.
Within both groups, men slightly outnumbered women. At baseline, CSF biomarker levels, cognitive scores, and hippocampal volumes were similar in the two groups. Adults who developed Alzheimer’s disease were more likely than their matched controls to be carriers of the APOE epsilon-4 allele (37% vs 20%).
In terms of CSF Abeta42, the level of this biomarker in those who developed Alzheimer’s disease diverged from the level in controls an estimated 18 years before clinical diagnosis. At that time, the level was lower by a mean 59.13 pg/mL in the Alzheimer’s disease group.
A difference in the ratio of CSF Abeta42 to Abeta40 between the two groups appeared an estimated 14 years before the diagnosis of Alzheimer’s disease (difference in mean values, −0.01 pg/mL).
Differences between the two groups in CSF p-tau181 and total tau concentrations were apparent roughly 11 and 10 years before diagnosis, respectively. At those times, the mean differences in p-tau181 and total tau concentrations were 7.10 pg/mL and 87.10 pg/mL, respectively.
In terms of NfL, a difference between the groups was observed 9 years before diagnosis, with its trajectory progressively deviating from the concentrations observed in cognitively normal groups at that time, to a final mean difference in NfL of 228.29 pg/mL.
Bilateral hippocampal volume decreased with age in both groups. However, the decrease began to differ between the two groups 8 years before Alzheimer’s disease diagnosis, at which time volume was lower by 358.94 mm3 in the Alzheimer’s disease group compared with the control group.
Average Clinical Dementia Rating–Sum of Boxes (CDR-SB) scores in the Alzheimer’s disease group began to worsen compared with the control group at about 6 years before diagnosis.
As Alzheimer’s disease progressed, changes in CSF biomarkers increased before reaching a plateau.
Important Contribution
In a linked editorial, Richard Mayeux, MD, Department of Neurology, Columbia University, New York, said the importance of this work “cannot be overstated. Knowledge of the timing of these physiological events is critical to provide clinicians with useful starting points for prevention and therapeutic strategies.”
Dr. Mayeux said this “remarkable” longitudinal study spanning 2 decades “not only confirms the hypotheses of previous investigators but extends and validates the sequence of changes” in sporadic Alzheimer’s disease.
Dr. Mayeux acknowledged that one might consider the finding in this study to be limited owing to the inclusion of only individuals of Han Chinese ancestry.
However, longitudinal studies of plasma biomarkers in individuals of Asian, European, African, and Hispanic ancestry have shown similar trends in biomarker changes preceding the onset of Alzheimer’s disease, he noted.
“Ethnic variation in these biomarkers is known, but that fact does not lessen the effect of the results reported. It merely highlights that similar studies must continue and must be inclusive of other groups,” Dr. Mayeux concluded.
The study had no commercial funding. Disclosures for authors and editorialist are available at NEJM.org.
A version of this article appeared on Medscape.com.
FROM THE NEW ENGLAND JOURNAL OF MEDICINE
5 Interesting Neurology Studies
This transcript has been edited for clarity.
Dear colleagues, I’m Christoph Diener from the medical faculty of University Duisburg-Essen in Germany. Today I would like to tell you about five interesting studies that were published in January 2024.
Long COVID
I would like to start with long COVID. There is an ongoing discussion about whether this condition — which means symptoms like dizziness, vertigo, fatigue, headache, and cognitive impairment that persist for more than 6 months — is either a consequence of the infection, functional symptoms, psychosomatic disease, or a depression.
There is an important paper that came out in Science. The group investigated 39 controls and 113 patients who had COVID-19. At 6 months, 40 of them had long COVID. The researchers repeatedly measured more than 6500 proteins in serum. The patients with long COVID had a significant increase in complement activation, which persisted even beyond 6 months. These patients also showed increased tissue lesion markers in the blood and activation of the endothelium.
Also, they had increased platelet activation and autoantibodies with increased anti-cytomegalovirus and anti-Epstein-Barr virus immunoglobulins. These are very strong indicators that COVID-19 leads to long-term changes in our immune system, and different activations of complement factors could explain the variety of symptoms that these patients display. Whether this has consequences for treatment is unclear at the moment.
Parkinson’s Classification
Let me come to another issue, which is the future treatment of Parkinson’s disease, covered in a paper in The Lancet Neurology. I think you are all aware that once patients display symptoms like rigidity, bradykinesia, or tremor, it’s most probably too late for neuroprotective therapy because 70% of the dopaminergic neurons are already dead.
The authors propose a new biological diagnosis of the disease in the preclinical state. This early preclinical diagnosis has three components. One is to show the presence of synuclein either in skin biopsy or in serum. The second is proof of neurodegeneration either by MRI or by PET imaging. The third involves genetic markers.
On top of this, we know that we have preclinical manifestations of Parkinson’s disease, like REM sleep disorders, autonomic disturbances, and cognitive impairment. With this new classification, we should be able to identify the preclinical phase of Parkinson’s disease and include these patients in future trials for neuroprotection.
Niemann-Pick Disease
My third study, in The New England Journal of Medicine, deals with Niemann-Pick disease type C (Trial of N-Acetyl-l-Leucine in Niemann–Pick Disease Type C. This is a rare autosomal recessive disorder that involves impaired lysosomal storage. This disease, which manifests usually in childhood, goes along with systemic, psychiatric, and neurologic abnormalities, and in particular, ataxia. Until now, there has been only one therapy, with miglustat. which has many side effects.
The group of authors found a new therapeutic approach with N-acetyl-L-leucine, which primarily increases mitochondrial energy production. This was a small, placebo-controlled, crossover trial with 2 x 12 weeks of treatment. This new compound showed efficacy and was very well tolerated. This shows that we definitely need long-term studies with this new, well-tolerated drug in this rare disease.
Anticoagulation in Subclinical AF
My fourth study comes from the stroke-prevention field, published in The New England Journal of Medicine. I think you are aware of subclinical atrail fibrillation. These are high-frequency episodes in ECG, usually identified by pacemakers or ECG monitoring systems. The international ARTESIA study included more than 4000 patients randomized either to apixaban 5 mg twice daily or aspirin 81 mg.
After 3.5 years, the investigators showed a small but significant decrease in the rate of stroke, with a relative risk reduction of 37%, but also, unfortunately, a significantly increased risk for major bleeding with apixaban. This means that we need a careful discussion with the patient, the family, and the GP to decide whether these patients should be anticoagulated or not.
Migraine and Depression
My final study, published in the European Journal of Neurology, deals with the comorbidity of depression and migraine. This study in the Netherlands included 108 patients treated with erenumab and 90 with fremanezumab; 68 were controls.
They used two depression scales. They showed that treatment with the monoclonal antibodies improved at least one of the two depression scales. I think this is an important study because it indicates that you can improve comorbid depression in people with severe migraine, even if this study did not show a correlation between the reduction in monthly migraine days and the improvement of depression.
What we learned for clinical practice is that we have to identify depression in people with migraine and we have to deal with it. Whether it’s with the treatment of monoclonal antibodies or antidepressant therapy doesn’t really matter.
Dear colleagues, we had interesting studies this month. I think the most spectacular one was published in Science on long COVID. Thank you very much for listening and watching. I’m Christoph Diener from University Duisburg-Essen.
Dr. Diener is Professor, Department of Neurology, Stroke Center-Headache Center, University Duisburg-Essen, Essen, Germany. He disclosed ties with Abbott; Addex Pharma; Alder; Allergan; Almirall; Amgen; Autonomic Technology; AstraZeneca; Bayer Vital; Berlin Chemie; Bristol-Myers Squibb; Boehringer Ingelheim; Chordate; CoAxia; Corimmun; Covidien; Coherex; CoLucid; Daiichi-Sankyo; D-Pharml Electrocore; Fresenius; GlaxoSmithKline; Grunenthal; Janssen-Cilag; Labrys Biologics Lilly; La Roche; 3M Medica; MSD; Medtronic; Menarini; MindFrame; Minster; Neuroscore; Neurobiological Technologies; Novartis; Novo-Nordisk; Johnson & Johnson; Knoll; Paion; Parke-Davis; Pierre Fabre; Pfizer Inc; Schaper and Brummer; sanofi-aventis; Schering-Plough; Servier; Solvay; Syngis; St. Jude; Talecris; Thrombogenics; WebMD Global; Weber and Weber; Wyeth; and Yamanouchi.
A version of this article appeared on Medscape.com.
This transcript has been edited for clarity.
Dear colleagues, I’m Christoph Diener from the medical faculty of University Duisburg-Essen in Germany. Today I would like to tell you about five interesting studies that were published in January 2024.
Long COVID
I would like to start with long COVID. There is an ongoing discussion about whether this condition — which means symptoms like dizziness, vertigo, fatigue, headache, and cognitive impairment that persist for more than 6 months — is either a consequence of the infection, functional symptoms, psychosomatic disease, or a depression.
There is an important paper that came out in Science. The group investigated 39 controls and 113 patients who had COVID-19. At 6 months, 40 of them had long COVID. The researchers repeatedly measured more than 6500 proteins in serum. The patients with long COVID had a significant increase in complement activation, which persisted even beyond 6 months. These patients also showed increased tissue lesion markers in the blood and activation of the endothelium.
Also, they had increased platelet activation and autoantibodies with increased anti-cytomegalovirus and anti-Epstein-Barr virus immunoglobulins. These are very strong indicators that COVID-19 leads to long-term changes in our immune system, and different activations of complement factors could explain the variety of symptoms that these patients display. Whether this has consequences for treatment is unclear at the moment.
Parkinson’s Classification
Let me come to another issue, which is the future treatment of Parkinson’s disease, covered in a paper in The Lancet Neurology. I think you are all aware that once patients display symptoms like rigidity, bradykinesia, or tremor, it’s most probably too late for neuroprotective therapy because 70% of the dopaminergic neurons are already dead.
The authors propose a new biological diagnosis of the disease in the preclinical state. This early preclinical diagnosis has three components. One is to show the presence of synuclein either in skin biopsy or in serum. The second is proof of neurodegeneration either by MRI or by PET imaging. The third involves genetic markers.
On top of this, we know that we have preclinical manifestations of Parkinson’s disease, like REM sleep disorders, autonomic disturbances, and cognitive impairment. With this new classification, we should be able to identify the preclinical phase of Parkinson’s disease and include these patients in future trials for neuroprotection.
Niemann-Pick Disease
My third study, in The New England Journal of Medicine, deals with Niemann-Pick disease type C (Trial of N-Acetyl-l-Leucine in Niemann–Pick Disease Type C. This is a rare autosomal recessive disorder that involves impaired lysosomal storage. This disease, which manifests usually in childhood, goes along with systemic, psychiatric, and neurologic abnormalities, and in particular, ataxia. Until now, there has been only one therapy, with miglustat. which has many side effects.
The group of authors found a new therapeutic approach with N-acetyl-L-leucine, which primarily increases mitochondrial energy production. This was a small, placebo-controlled, crossover trial with 2 x 12 weeks of treatment. This new compound showed efficacy and was very well tolerated. This shows that we definitely need long-term studies with this new, well-tolerated drug in this rare disease.
Anticoagulation in Subclinical AF
My fourth study comes from the stroke-prevention field, published in The New England Journal of Medicine. I think you are aware of subclinical atrail fibrillation. These are high-frequency episodes in ECG, usually identified by pacemakers or ECG monitoring systems. The international ARTESIA study included more than 4000 patients randomized either to apixaban 5 mg twice daily or aspirin 81 mg.
After 3.5 years, the investigators showed a small but significant decrease in the rate of stroke, with a relative risk reduction of 37%, but also, unfortunately, a significantly increased risk for major bleeding with apixaban. This means that we need a careful discussion with the patient, the family, and the GP to decide whether these patients should be anticoagulated or not.
Migraine and Depression
My final study, published in the European Journal of Neurology, deals with the comorbidity of depression and migraine. This study in the Netherlands included 108 patients treated with erenumab and 90 with fremanezumab; 68 were controls.
They used two depression scales. They showed that treatment with the monoclonal antibodies improved at least one of the two depression scales. I think this is an important study because it indicates that you can improve comorbid depression in people with severe migraine, even if this study did not show a correlation between the reduction in monthly migraine days and the improvement of depression.
What we learned for clinical practice is that we have to identify depression in people with migraine and we have to deal with it. Whether it’s with the treatment of monoclonal antibodies or antidepressant therapy doesn’t really matter.
Dear colleagues, we had interesting studies this month. I think the most spectacular one was published in Science on long COVID. Thank you very much for listening and watching. I’m Christoph Diener from University Duisburg-Essen.
Dr. Diener is Professor, Department of Neurology, Stroke Center-Headache Center, University Duisburg-Essen, Essen, Germany. He disclosed ties with Abbott; Addex Pharma; Alder; Allergan; Almirall; Amgen; Autonomic Technology; AstraZeneca; Bayer Vital; Berlin Chemie; Bristol-Myers Squibb; Boehringer Ingelheim; Chordate; CoAxia; Corimmun; Covidien; Coherex; CoLucid; Daiichi-Sankyo; D-Pharml Electrocore; Fresenius; GlaxoSmithKline; Grunenthal; Janssen-Cilag; Labrys Biologics Lilly; La Roche; 3M Medica; MSD; Medtronic; Menarini; MindFrame; Minster; Neuroscore; Neurobiological Technologies; Novartis; Novo-Nordisk; Johnson & Johnson; Knoll; Paion; Parke-Davis; Pierre Fabre; Pfizer Inc; Schaper and Brummer; sanofi-aventis; Schering-Plough; Servier; Solvay; Syngis; St. Jude; Talecris; Thrombogenics; WebMD Global; Weber and Weber; Wyeth; and Yamanouchi.
A version of this article appeared on Medscape.com.
This transcript has been edited for clarity.
Dear colleagues, I’m Christoph Diener from the medical faculty of University Duisburg-Essen in Germany. Today I would like to tell you about five interesting studies that were published in January 2024.
Long COVID
I would like to start with long COVID. There is an ongoing discussion about whether this condition — which means symptoms like dizziness, vertigo, fatigue, headache, and cognitive impairment that persist for more than 6 months — is either a consequence of the infection, functional symptoms, psychosomatic disease, or a depression.
There is an important paper that came out in Science. The group investigated 39 controls and 113 patients who had COVID-19. At 6 months, 40 of them had long COVID. The researchers repeatedly measured more than 6500 proteins in serum. The patients with long COVID had a significant increase in complement activation, which persisted even beyond 6 months. These patients also showed increased tissue lesion markers in the blood and activation of the endothelium.
Also, they had increased platelet activation and autoantibodies with increased anti-cytomegalovirus and anti-Epstein-Barr virus immunoglobulins. These are very strong indicators that COVID-19 leads to long-term changes in our immune system, and different activations of complement factors could explain the variety of symptoms that these patients display. Whether this has consequences for treatment is unclear at the moment.
Parkinson’s Classification
Let me come to another issue, which is the future treatment of Parkinson’s disease, covered in a paper in The Lancet Neurology. I think you are all aware that once patients display symptoms like rigidity, bradykinesia, or tremor, it’s most probably too late for neuroprotective therapy because 70% of the dopaminergic neurons are already dead.
The authors propose a new biological diagnosis of the disease in the preclinical state. This early preclinical diagnosis has three components. One is to show the presence of synuclein either in skin biopsy or in serum. The second is proof of neurodegeneration either by MRI or by PET imaging. The third involves genetic markers.
On top of this, we know that we have preclinical manifestations of Parkinson’s disease, like REM sleep disorders, autonomic disturbances, and cognitive impairment. With this new classification, we should be able to identify the preclinical phase of Parkinson’s disease and include these patients in future trials for neuroprotection.
Niemann-Pick Disease
My third study, in The New England Journal of Medicine, deals with Niemann-Pick disease type C (Trial of N-Acetyl-l-Leucine in Niemann–Pick Disease Type C. This is a rare autosomal recessive disorder that involves impaired lysosomal storage. This disease, which manifests usually in childhood, goes along with systemic, psychiatric, and neurologic abnormalities, and in particular, ataxia. Until now, there has been only one therapy, with miglustat. which has many side effects.
The group of authors found a new therapeutic approach with N-acetyl-L-leucine, which primarily increases mitochondrial energy production. This was a small, placebo-controlled, crossover trial with 2 x 12 weeks of treatment. This new compound showed efficacy and was very well tolerated. This shows that we definitely need long-term studies with this new, well-tolerated drug in this rare disease.
Anticoagulation in Subclinical AF
My fourth study comes from the stroke-prevention field, published in The New England Journal of Medicine. I think you are aware of subclinical atrail fibrillation. These are high-frequency episodes in ECG, usually identified by pacemakers or ECG monitoring systems. The international ARTESIA study included more than 4000 patients randomized either to apixaban 5 mg twice daily or aspirin 81 mg.
After 3.5 years, the investigators showed a small but significant decrease in the rate of stroke, with a relative risk reduction of 37%, but also, unfortunately, a significantly increased risk for major bleeding with apixaban. This means that we need a careful discussion with the patient, the family, and the GP to decide whether these patients should be anticoagulated or not.
Migraine and Depression
My final study, published in the European Journal of Neurology, deals with the comorbidity of depression and migraine. This study in the Netherlands included 108 patients treated with erenumab and 90 with fremanezumab; 68 were controls.
They used two depression scales. They showed that treatment with the monoclonal antibodies improved at least one of the two depression scales. I think this is an important study because it indicates that you can improve comorbid depression in people with severe migraine, even if this study did not show a correlation between the reduction in monthly migraine days and the improvement of depression.
What we learned for clinical practice is that we have to identify depression in people with migraine and we have to deal with it. Whether it’s with the treatment of monoclonal antibodies or antidepressant therapy doesn’t really matter.
Dear colleagues, we had interesting studies this month. I think the most spectacular one was published in Science on long COVID. Thank you very much for listening and watching. I’m Christoph Diener from University Duisburg-Essen.
Dr. Diener is Professor, Department of Neurology, Stroke Center-Headache Center, University Duisburg-Essen, Essen, Germany. He disclosed ties with Abbott; Addex Pharma; Alder; Allergan; Almirall; Amgen; Autonomic Technology; AstraZeneca; Bayer Vital; Berlin Chemie; Bristol-Myers Squibb; Boehringer Ingelheim; Chordate; CoAxia; Corimmun; Covidien; Coherex; CoLucid; Daiichi-Sankyo; D-Pharml Electrocore; Fresenius; GlaxoSmithKline; Grunenthal; Janssen-Cilag; Labrys Biologics Lilly; La Roche; 3M Medica; MSD; Medtronic; Menarini; MindFrame; Minster; Neuroscore; Neurobiological Technologies; Novartis; Novo-Nordisk; Johnson & Johnson; Knoll; Paion; Parke-Davis; Pierre Fabre; Pfizer Inc; Schaper and Brummer; sanofi-aventis; Schering-Plough; Servier; Solvay; Syngis; St. Jude; Talecris; Thrombogenics; WebMD Global; Weber and Weber; Wyeth; and Yamanouchi.
A version of this article appeared on Medscape.com.