Neurology

Several maternal chronic conditions increase the risk of giving birth to a child with cerebral palsy, based on data from more than 1.3 million Norwegian children.

Mothers with autoimmune disorders, such as diabetes and lupus, had the greatest risks, reported lead author Marianne S. Strøm, MD, of the University of Bergen (Norway) and colleagues.

“The etiologies of cerebral palsy are complex, and only a few prenatal risk factors have been identified,” the investigators wrote in Pediatrics. “Among these possible risk factors are maternal chronic conditions, although studies are typically underpowered and limited to one or two conditions.”

According to Dr. Strøm and colleagues, several components of maternal chronic conditions have been linked with cerebral palsy, including placental abnormalities, altered thrombotic state, and inflammation. Furthermore, mothers with chronic conditions are more likely to give birth prematurely and have children with congenital malformations, both of which have also been associated with cerebral palsy.

To date, however, “there has been no systematic description of maternal chronic conditions and risk of cerebral palsy in offspring,” the investigators noted.

The present, prospective cohort study aimed to meet this need with a population of 1,360,149 children born in Norway from 1990 to 2012, among whom 3,575 had cerebral palsy. Case data were extracted from the Norwegian Patient Registry and the National Insurance Scheme. Information about maternal chronic conditions was extracted from the Medical Birth Registry of Norway and the Norwegian Patient Registry, with the latter also providing information about paternal chronic conditions.

Using log binomial regression models, the investigators determined relative risks of having children with cerebral palsy among parents with chronic conditions versus parents from the general population. This revealed that chronic conditions in fathers had no correlation with cerebral palsy. In contrast, mothers with chronic conditions had a 30% increased risk (relative risk, 1.3; 95% confidence interval, 1.2-1.5), which could be further stratified by number of chronic conditions; mothers with one chronic condition, for instance, had a 20% increased risk (RR, 1.2; 95% CI, 1.1-1.4), while those with two chronic conditions had a 60% increased risk (RR, 1.6; 95% CI, 1.1-2.2), and those with more than two chronic conditions had triple the risk (RR, 3.1; 95% CI, 1.4-6.8)

“The lack of associations between the father’s chronic illness and cerebral palsy risk supports the interpretation that cerebral palsy risk in offspring is the direct result of the mother’s condition and not genetic predisposition or unmeasured situational factors,” the investigators wrote.

Maternal autoimmune conditions were particularly relevant, as they were associated with a 40% increased risk of cerebral palsy (RR, 1.4; 95% CI, 1.1-1.7), a rate that climbed dramatically, to 270%, among mothers with more than one autoimmune condition (RR, 2.7; 95% CI, 1.1-6.6).

“The role of autoimmune diseases in cerebral palsy risk (and maternal inflammation specifically) deserves closer attention,” the investigators wrote. “Using studies with larger sample sizes and a more clinical focus, including measures of placental structure and perinatal blood assays, researchers may be able to explore these possible connections between maternal autoimmune diseases and fetal neurodevelopment.”

Specifically, cerebral palsy in offspring was most strongly associated with maternal Crohn’s disease (RR, 2.1; 95% CI, 1.0-4.1), type 1 diabetes (RR, 2.2; 95% CI, 1.4-3.4), lupus erythematosus (RR, 2.7; 95% CI, 0.9-8.3), and type 2 diabetes (RR, 3.2; 95% CI, 1.8-5.4). Associations were also found for migraine (RR, 1.6; 95% CI, 1.2-2.2), multiple sclerosis (RR, 1.8; 95% CI, 0.8-4.4), and rheumatoid arthritis (RR, 2.0; 95% CI, 1.3-2.9). Several “weaker and less convincing associations” were detected for ulcerative colitis, thyroid disorder, epilepsy, asthma, anemia, and hypertension. Adjusting for parental education level, age, smoking status, and single-mother status did not significantly alter findings. Poisson and logistic regression models generated similar results.

In an accompanying editorial, Sandra Julsen Hollung, PhD, of the Cerebral Palsy Registry of Norway, Vestfold Hospital Trust, Tønsberg, and colleagues, advised that clinicians maintain perspective when discussing these findings with the general public.

“As the authors state, the absolute risk of cerebral palsy associated with at least one chronic maternal condition is low,” wrote Dr. Hollung and colleagues. “Among 1,000 pregnant women with any chronic and/or autoimmune disorder, more than 990 will deliver an infant who will not be diagnosed with cerebral palsy.”

They went on to emphasize that the study findings should not be viewed as firm evidence of causal relationships.

“Thus, the study cannot give clues to any specific preventive treatment,” wrote Dr. Hollung and colleagues. “However, if these disorders are part of a causal pathway, optimal treatment might reduce the risk of cerebral palsy.”

Although Dr. Hollung and colleagues advised that such efforts “would hardly affect the birth prevalence of cerebral palsy,” they also cited the Royal College of Obstetricians and Gynaecologists in the United Kingdom, noting that “each baby counts.”

Emeritus Professor Alastair MacLennan, AO, MB ChB, FRCOG, FRANZCOG, head of the Australian Collaborative Cerebral Palsy Research Group at the University of Adelaide (Australia) suggested that the findings may guide future research.

“An increasing proportion of cerebral palsy cases are being diagnosed by genome sequencing and other genetic techniques to have causative genetic variations,” Dr. MacLennan said. “The possibility of epigenetic interactions are also likely and are still to be investigated. Maternal disorders such as diabetes, lupus, or Crohn’s disease are possible epigenetic factors and this study helps to target these in future genetic and environmental studies of cerebral palsy causation. The days of attributing cerebral palsy to ‘birth asphyxia’ are over.”

The study was supported by the National Institutes of Health and the Western Norwegian Regional Health Authorities. The investigators reported no conflicts of interest.

Several maternal chronic conditions increase the risk of giving birth to a child with cerebral palsy, based on data from more than 1.3 million Norwegian children.

Mothers with autoimmune disorders, such as diabetes and lupus, had the greatest risks, reported lead author Marianne S. Strøm, MD, of the University of Bergen (Norway) and colleagues.

“The etiologies of cerebral palsy are complex, and only a few prenatal risk factors have been identified,” the investigators wrote in Pediatrics. “Among these possible risk factors are maternal chronic conditions, although studies are typically underpowered and limited to one or two conditions.”

According to Dr. Strøm and colleagues, several components of maternal chronic conditions have been linked with cerebral palsy, including placental abnormalities, altered thrombotic state, and inflammation. Furthermore, mothers with chronic conditions are more likely to give birth prematurely and have children with congenital malformations, both of which have also been associated with cerebral palsy.

To date, however, “there has been no systematic description of maternal chronic conditions and risk of cerebral palsy in offspring,” the investigators noted.

The present, prospective cohort study aimed to meet this need with a population of 1,360,149 children born in Norway from 1990 to 2012, among whom 3,575 had cerebral palsy. Case data were extracted from the Norwegian Patient Registry and the National Insurance Scheme. Information about maternal chronic conditions was extracted from the Medical Birth Registry of Norway and the Norwegian Patient Registry, with the latter also providing information about paternal chronic conditions.

Using log binomial regression models, the investigators determined relative risks of having children with cerebral palsy among parents with chronic conditions versus parents from the general population. This revealed that chronic conditions in fathers had no correlation with cerebral palsy. In contrast, mothers with chronic conditions had a 30% increased risk (relative risk, 1.3; 95% confidence interval, 1.2-1.5), which could be further stratified by number of chronic conditions; mothers with one chronic condition, for instance, had a 20% increased risk (RR, 1.2; 95% CI, 1.1-1.4), while those with two chronic conditions had a 60% increased risk (RR, 1.6; 95% CI, 1.1-2.2), and those with more than two chronic conditions had triple the risk (RR, 3.1; 95% CI, 1.4-6.8)

“The lack of associations between the father’s chronic illness and cerebral palsy risk supports the interpretation that cerebral palsy risk in offspring is the direct result of the mother’s condition and not genetic predisposition or unmeasured situational factors,” the investigators wrote.

Maternal autoimmune conditions were particularly relevant, as they were associated with a 40% increased risk of cerebral palsy (RR, 1.4; 95% CI, 1.1-1.7), a rate that climbed dramatically, to 270%, among mothers with more than one autoimmune condition (RR, 2.7; 95% CI, 1.1-6.6).

“The role of autoimmune diseases in cerebral palsy risk (and maternal inflammation specifically) deserves closer attention,” the investigators wrote. “Using studies with larger sample sizes and a more clinical focus, including measures of placental structure and perinatal blood assays, researchers may be able to explore these possible connections between maternal autoimmune diseases and fetal neurodevelopment.”

Specifically, cerebral palsy in offspring was most strongly associated with maternal Crohn’s disease (RR, 2.1; 95% CI, 1.0-4.1), type 1 diabetes (RR, 2.2; 95% CI, 1.4-3.4), lupus erythematosus (RR, 2.7; 95% CI, 0.9-8.3), and type 2 diabetes (RR, 3.2; 95% CI, 1.8-5.4). Associations were also found for migraine (RR, 1.6; 95% CI, 1.2-2.2), multiple sclerosis (RR, 1.8; 95% CI, 0.8-4.4), and rheumatoid arthritis (RR, 2.0; 95% CI, 1.3-2.9). Several “weaker and less convincing associations” were detected for ulcerative colitis, thyroid disorder, epilepsy, asthma, anemia, and hypertension. Adjusting for parental education level, age, smoking status, and single-mother status did not significantly alter findings. Poisson and logistic regression models generated similar results.

In an accompanying editorial, Sandra Julsen Hollung, PhD, of the Cerebral Palsy Registry of Norway, Vestfold Hospital Trust, Tønsberg, and colleagues, advised that clinicians maintain perspective when discussing these findings with the general public.

“As the authors state, the absolute risk of cerebral palsy associated with at least one chronic maternal condition is low,” wrote Dr. Hollung and colleagues. “Among 1,000 pregnant women with any chronic and/or autoimmune disorder, more than 990 will deliver an infant who will not be diagnosed with cerebral palsy.”

They went on to emphasize that the study findings should not be viewed as firm evidence of causal relationships.

“Thus, the study cannot give clues to any specific preventive treatment,” wrote Dr. Hollung and colleagues. “However, if these disorders are part of a causal pathway, optimal treatment might reduce the risk of cerebral palsy.”

Although Dr. Hollung and colleagues advised that such efforts “would hardly affect the birth prevalence of cerebral palsy,” they also cited the Royal College of Obstetricians and Gynaecologists in the United Kingdom, noting that “each baby counts.”

Emeritus Professor Alastair MacLennan, AO, MB ChB, FRCOG, FRANZCOG, head of the Australian Collaborative Cerebral Palsy Research Group at the University of Adelaide (Australia) suggested that the findings may guide future research.

“An increasing proportion of cerebral palsy cases are being diagnosed by genome sequencing and other genetic techniques to have causative genetic variations,” Dr. MacLennan said. “The possibility of epigenetic interactions are also likely and are still to be investigated. Maternal disorders such as diabetes, lupus, or Crohn’s disease are possible epigenetic factors and this study helps to target these in future genetic and environmental studies of cerebral palsy causation. The days of attributing cerebral palsy to ‘birth asphyxia’ are over.”

The study was supported by the National Institutes of Health and the Western Norwegian Regional Health Authorities. The investigators reported no conflicts of interest.

Several maternal chronic conditions increase the risk of giving birth to a child with cerebral palsy, based on data from more than 1.3 million Norwegian children.

Mothers with autoimmune disorders, such as diabetes and lupus, had the greatest risks, reported lead author Marianne S. Strøm, MD, of the University of Bergen (Norway) and colleagues.

“The etiologies of cerebral palsy are complex, and only a few prenatal risk factors have been identified,” the investigators wrote in Pediatrics. “Among these possible risk factors are maternal chronic conditions, although studies are typically underpowered and limited to one or two conditions.”

According to Dr. Strøm and colleagues, several components of maternal chronic conditions have been linked with cerebral palsy, including placental abnormalities, altered thrombotic state, and inflammation. Furthermore, mothers with chronic conditions are more likely to give birth prematurely and have children with congenital malformations, both of which have also been associated with cerebral palsy.

To date, however, “there has been no systematic description of maternal chronic conditions and risk of cerebral palsy in offspring,” the investigators noted.

The present, prospective cohort study aimed to meet this need with a population of 1,360,149 children born in Norway from 1990 to 2012, among whom 3,575 had cerebral palsy. Case data were extracted from the Norwegian Patient Registry and the National Insurance Scheme. Information about maternal chronic conditions was extracted from the Medical Birth Registry of Norway and the Norwegian Patient Registry, with the latter also providing information about paternal chronic conditions.

Using log binomial regression models, the investigators determined relative risks of having children with cerebral palsy among parents with chronic conditions versus parents from the general population. This revealed that chronic conditions in fathers had no correlation with cerebral palsy. In contrast, mothers with chronic conditions had a 30% increased risk (relative risk, 1.3; 95% confidence interval, 1.2-1.5), which could be further stratified by number of chronic conditions; mothers with one chronic condition, for instance, had a 20% increased risk (RR, 1.2; 95% CI, 1.1-1.4), while those with two chronic conditions had a 60% increased risk (RR, 1.6; 95% CI, 1.1-2.2), and those with more than two chronic conditions had triple the risk (RR, 3.1; 95% CI, 1.4-6.8)

“The lack of associations between the father’s chronic illness and cerebral palsy risk supports the interpretation that cerebral palsy risk in offspring is the direct result of the mother’s condition and not genetic predisposition or unmeasured situational factors,” the investigators wrote.

Maternal autoimmune conditions were particularly relevant, as they were associated with a 40% increased risk of cerebral palsy (RR, 1.4; 95% CI, 1.1-1.7), a rate that climbed dramatically, to 270%, among mothers with more than one autoimmune condition (RR, 2.7; 95% CI, 1.1-6.6).

“The role of autoimmune diseases in cerebral palsy risk (and maternal inflammation specifically) deserves closer attention,” the investigators wrote. “Using studies with larger sample sizes and a more clinical focus, including measures of placental structure and perinatal blood assays, researchers may be able to explore these possible connections between maternal autoimmune diseases and fetal neurodevelopment.”

Specifically, cerebral palsy in offspring was most strongly associated with maternal Crohn’s disease (RR, 2.1; 95% CI, 1.0-4.1), type 1 diabetes (RR, 2.2; 95% CI, 1.4-3.4), lupus erythematosus (RR, 2.7; 95% CI, 0.9-8.3), and type 2 diabetes (RR, 3.2; 95% CI, 1.8-5.4). Associations were also found for migraine (RR, 1.6; 95% CI, 1.2-2.2), multiple sclerosis (RR, 1.8; 95% CI, 0.8-4.4), and rheumatoid arthritis (RR, 2.0; 95% CI, 1.3-2.9). Several “weaker and less convincing associations” were detected for ulcerative colitis, thyroid disorder, epilepsy, asthma, anemia, and hypertension. Adjusting for parental education level, age, smoking status, and single-mother status did not significantly alter findings. Poisson and logistic regression models generated similar results.

In an accompanying editorial, Sandra Julsen Hollung, PhD, of the Cerebral Palsy Registry of Norway, Vestfold Hospital Trust, Tønsberg, and colleagues, advised that clinicians maintain perspective when discussing these findings with the general public.

“As the authors state, the absolute risk of cerebral palsy associated with at least one chronic maternal condition is low,” wrote Dr. Hollung and colleagues. “Among 1,000 pregnant women with any chronic and/or autoimmune disorder, more than 990 will deliver an infant who will not be diagnosed with cerebral palsy.”

They went on to emphasize that the study findings should not be viewed as firm evidence of causal relationships.

“Thus, the study cannot give clues to any specific preventive treatment,” wrote Dr. Hollung and colleagues. “However, if these disorders are part of a causal pathway, optimal treatment might reduce the risk of cerebral palsy.”

Although Dr. Hollung and colleagues advised that such efforts “would hardly affect the birth prevalence of cerebral palsy,” they also cited the Royal College of Obstetricians and Gynaecologists in the United Kingdom, noting that “each baby counts.”

Emeritus Professor Alastair MacLennan, AO, MB ChB, FRCOG, FRANZCOG, head of the Australian Collaborative Cerebral Palsy Research Group at the University of Adelaide (Australia) suggested that the findings may guide future research.

“An increasing proportion of cerebral palsy cases are being diagnosed by genome sequencing and other genetic techniques to have causative genetic variations,” Dr. MacLennan said. “The possibility of epigenetic interactions are also likely and are still to be investigated. Maternal disorders such as diabetes, lupus, or Crohn’s disease are possible epigenetic factors and this study helps to target these in future genetic and environmental studies of cerebral palsy causation. The days of attributing cerebral palsy to ‘birth asphyxia’ are over.”

The study was supported by the National Institutes of Health and the Western Norwegian Regional Health Authorities. The investigators reported no conflicts of interest.

Elevations in serum neurofilament light chain levels in people with multiple sclerosis (MS) are significantly linked to worse neurologic function, clinical disability, and lower brain volumes, according to new findings from a large, diverse population of patients with MS. “This is one of the largest studies to evaluate serum neurofilament light chain levels in people with MS,” said lead author Elias S. Sotirchos, MD, an assistant professor of neurology at Johns Hopkins University, Baltimore.

“An important strength of this cohort is that it is a real-world cohort of patients followed in U.S. and European MS centers,” he said. “The study captures the diversity of the MS population, including demographics, comorbidities, lifestyle factors, and clinical characteristics that may otherwise not be captured in a clinical trial population.”

The research was presented at the meeting held by the Americas Committee for Treatment and Research in Multiple Sclerosis.
 

Scrutinizing serum neurofilament light chain levels in a real-world cohort

Neurofilaments – neuron-specific proteins that release in response to neuroaxonal injury – have been observed to be elevated in a variety of neurologic disorders, and with a need for biomarkers in MS, there is high interest of their role in the disease. But studies involving real-world, heterogeneous MS populations are lacking, the researchers noted.

To take a broader look at the issue, Dr. Sotirchos and colleagues conducted a cross-sectional evaluation of 6,968 people with MS in the Multiple Sclerosis Partners Advancing Technology and Health Solutions (MS PATHS), a large network of MS centers in the United States and Europe.

Participants’ baseline serum neurofilament light chain levels were compared with those of 201 healthy controls in the cohort using a novel, high-throughput immunoassay (Siemens Healthineers).

Of those with MS, 1,202 (17.2%) showed elevated serum neurofilament light chain levels, above the age-specific 97.5th percentile derived from the healthy controls.

A look at key factors associated with elevations showed significant links to having progressive MS (odds ratio, 1.63), non-White race (OR, 1.43), type 2 diabetes (OR, 1.89), and smoking (current vs. never smoker; OR, 1.49).

Associations with age and symptom duration were somewhat complex, but overall, younger patients and those with shorter disease duration had the highest frequency of elevated serum neurofilament light chain levels.

Interestingly, those with a higher body mass index (BMI) showed a reduced odds of having elevated serum neurofilament light chain levels (OR, 0.83 per 5 kg/m² increase in BMI).

Evaluation of neuroperformance measures – including walking speed, manual dexterity and processing speed, and MRI data – showed that those with elevated serum neurofilament light chain levels had worse neurologic function, lower brain parenchymal fraction, lower thalamic volume, and higher T2 lesion volume (P < .001 for all).

Dr. Sotirchos noted that the higher rates of elevations in younger people, also observed in previous clinical trials, may reflect higher early-stage disease activity. “Generally, people who are younger and earlier in the course of disease tend to have more inflammatory disease activity in MS, and that could be what we’re capturing here, but we need to better understand the pathologic correlates of elevated serum neurofilament light chain levels.”

The lower levels of neurofilament light chain with higher BMI, also recently reported in another study, likewise need further investigation, including in healthy controls, Dr. Sotirchos added. “Having lower serum neurofilament light chain levels with increasing BMI could have to do with effects of blood volume and how the serum neurofilament light chain levels is distributed in the body,” he explained.

The findings suggest that interpretation of serum neurofilament light chain levels without accounting for BMI could result in false-negative or false-positive results, Dr. Sotirchos noted. “It will be important to further evaluate this observation in control populations and account for BMI in neurofilament light chain reference ranges.”

Dr. Sotirchos added that the 17% rate of elevated serum neurofilament light chain levels seen in people with MS in the study is likely an underestimate.

“This is a cross-sectional study and represents one sample per patient, so it is a snapshot in time,” he said. “With the nature of MS, we know that people’s levels fluctuate over time.” In addition, most patients were on disease-modifying therapy for MS, so serum neurofilament light chain elevations could have been suppressed.
 

Applying the findings to individual patients

Commenting on the findings, Jennifer Graves, MD, PhD, director of the neuroimmunology research program at the University of California, San Diego, said the study is an important addition to the ongoing evidence on serum neurofilament light chain in MS.

“The current presented research importantly addresses the gaps we have in understanding how best to apply serum filament light chain levels to individual patients and not just using them to assess group level means of outcome measures,” she said.

“The MS PATHS collaborative is looking at multiple factors (in addition to MS activity) that drive serum neurofilament light chain levels so meaningful and practical cutoffs for what’s abnormal can be created,” said Dr. Graves, who also directs the Rady Children’s Pediatric MS Clinic in San Diego.

Dr. Graves noted that the findings on BMI were unexpected. “Elevated BMI has been shown to be associated with greater brain atrophy and greater relapses and disability in MS participants, so to have an opposite effect with serum neurofilament light chain is interesting.

“My thoughts would be that obesity is somehow affecting measurable blood levels of this marker. I think it less likely BMI has a protective effect against neurodegeneration given the observations with other MS outcome measures,” she added. 
 

Future research

In terms of future directions, Dr. Sotirchos noted that the researchers are following the group longitudinally to further assess changes in neurofilament light chain over time, and will be looking at associations with longitudinal, clinical, and radiologic outcomes.

The current research, meanwhile, offers important insights in terms of developing precision reference ranges, he noted.

“It appears that reference ranges may need to account for sex, race, BMI, and comorbid/lifestyle factors,” Dr. Sotirchos said, “in order to potentially improve the performance of serum neurofilament light chain as a biomarker in MS and other neurological diseases.”

The study received funding from Biogen and the MS PATHS network receives funding from Biogen. Dr. Sotirchos has served on scientific advisory boards for Alexion, Viela Bio, and Genentech, and has received speaker honoraria from Viela Bio and Biogen. Dr. Graves has disclosed no relevant financial relationships.

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

Elevations in serum neurofilament light chain levels in people with multiple sclerosis (MS) are significantly linked to worse neurologic function, clinical disability, and lower brain volumes, according to new findings from a large, diverse population of patients with MS. “This is one of the largest studies to evaluate serum neurofilament light chain levels in people with MS,” said lead author Elias S. Sotirchos, MD, an assistant professor of neurology at Johns Hopkins University, Baltimore.

“An important strength of this cohort is that it is a real-world cohort of patients followed in U.S. and European MS centers,” he said. “The study captures the diversity of the MS population, including demographics, comorbidities, lifestyle factors, and clinical characteristics that may otherwise not be captured in a clinical trial population.”

The research was presented at the meeting held by the Americas Committee for Treatment and Research in Multiple Sclerosis.
 

Scrutinizing serum neurofilament light chain levels in a real-world cohort

Neurofilaments – neuron-specific proteins that release in response to neuroaxonal injury – have been observed to be elevated in a variety of neurologic disorders, and with a need for biomarkers in MS, there is high interest of their role in the disease. But studies involving real-world, heterogeneous MS populations are lacking, the researchers noted.

To take a broader look at the issue, Dr. Sotirchos and colleagues conducted a cross-sectional evaluation of 6,968 people with MS in the Multiple Sclerosis Partners Advancing Technology and Health Solutions (MS PATHS), a large network of MS centers in the United States and Europe.

Participants’ baseline serum neurofilament light chain levels were compared with those of 201 healthy controls in the cohort using a novel, high-throughput immunoassay (Siemens Healthineers).

Of those with MS, 1,202 (17.2%) showed elevated serum neurofilament light chain levels, above the age-specific 97.5th percentile derived from the healthy controls.

A look at key factors associated with elevations showed significant links to having progressive MS (odds ratio, 1.63), non-White race (OR, 1.43), type 2 diabetes (OR, 1.89), and smoking (current vs. never smoker; OR, 1.49).

Associations with age and symptom duration were somewhat complex, but overall, younger patients and those with shorter disease duration had the highest frequency of elevated serum neurofilament light chain levels.

Interestingly, those with a higher body mass index (BMI) showed a reduced odds of having elevated serum neurofilament light chain levels (OR, 0.83 per 5 kg/m² increase in BMI).

Evaluation of neuroperformance measures – including walking speed, manual dexterity and processing speed, and MRI data – showed that those with elevated serum neurofilament light chain levels had worse neurologic function, lower brain parenchymal fraction, lower thalamic volume, and higher T2 lesion volume (P < .001 for all).

Dr. Sotirchos noted that the higher rates of elevations in younger people, also observed in previous clinical trials, may reflect higher early-stage disease activity. “Generally, people who are younger and earlier in the course of disease tend to have more inflammatory disease activity in MS, and that could be what we’re capturing here, but we need to better understand the pathologic correlates of elevated serum neurofilament light chain levels.”

The lower levels of neurofilament light chain with higher BMI, also recently reported in another study, likewise need further investigation, including in healthy controls, Dr. Sotirchos added. “Having lower serum neurofilament light chain levels with increasing BMI could have to do with effects of blood volume and how the serum neurofilament light chain levels is distributed in the body,” he explained.

The findings suggest that interpretation of serum neurofilament light chain levels without accounting for BMI could result in false-negative or false-positive results, Dr. Sotirchos noted. “It will be important to further evaluate this observation in control populations and account for BMI in neurofilament light chain reference ranges.”

Dr. Sotirchos added that the 17% rate of elevated serum neurofilament light chain levels seen in people with MS in the study is likely an underestimate.

“This is a cross-sectional study and represents one sample per patient, so it is a snapshot in time,” he said. “With the nature of MS, we know that people’s levels fluctuate over time.” In addition, most patients were on disease-modifying therapy for MS, so serum neurofilament light chain elevations could have been suppressed.
 

Applying the findings to individual patients

Commenting on the findings, Jennifer Graves, MD, PhD, director of the neuroimmunology research program at the University of California, San Diego, said the study is an important addition to the ongoing evidence on serum neurofilament light chain in MS.

“The current presented research importantly addresses the gaps we have in understanding how best to apply serum filament light chain levels to individual patients and not just using them to assess group level means of outcome measures,” she said.

“The MS PATHS collaborative is looking at multiple factors (in addition to MS activity) that drive serum neurofilament light chain levels so meaningful and practical cutoffs for what’s abnormal can be created,” said Dr. Graves, who also directs the Rady Children’s Pediatric MS Clinic in San Diego.

Dr. Graves noted that the findings on BMI were unexpected. “Elevated BMI has been shown to be associated with greater brain atrophy and greater relapses and disability in MS participants, so to have an opposite effect with serum neurofilament light chain is interesting.

“My thoughts would be that obesity is somehow affecting measurable blood levels of this marker. I think it less likely BMI has a protective effect against neurodegeneration given the observations with other MS outcome measures,” she added. 
 

Future research

In terms of future directions, Dr. Sotirchos noted that the researchers are following the group longitudinally to further assess changes in neurofilament light chain over time, and will be looking at associations with longitudinal, clinical, and radiologic outcomes.

The current research, meanwhile, offers important insights in terms of developing precision reference ranges, he noted.

“It appears that reference ranges may need to account for sex, race, BMI, and comorbid/lifestyle factors,” Dr. Sotirchos said, “in order to potentially improve the performance of serum neurofilament light chain as a biomarker in MS and other neurological diseases.”

The study received funding from Biogen and the MS PATHS network receives funding from Biogen. Dr. Sotirchos has served on scientific advisory boards for Alexion, Viela Bio, and Genentech, and has received speaker honoraria from Viela Bio and Biogen. Dr. Graves has disclosed no relevant financial relationships.

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

Elevations in serum neurofilament light chain levels in people with multiple sclerosis (MS) are significantly linked to worse neurologic function, clinical disability, and lower brain volumes, according to new findings from a large, diverse population of patients with MS. “This is one of the largest studies to evaluate serum neurofilament light chain levels in people with MS,” said lead author Elias S. Sotirchos, MD, an assistant professor of neurology at Johns Hopkins University, Baltimore.

“An important strength of this cohort is that it is a real-world cohort of patients followed in U.S. and European MS centers,” he said. “The study captures the diversity of the MS population, including demographics, comorbidities, lifestyle factors, and clinical characteristics that may otherwise not be captured in a clinical trial population.”

The research was presented at the meeting held by the Americas Committee for Treatment and Research in Multiple Sclerosis.
 

Scrutinizing serum neurofilament light chain levels in a real-world cohort

Neurofilaments – neuron-specific proteins that release in response to neuroaxonal injury – have been observed to be elevated in a variety of neurologic disorders, and with a need for biomarkers in MS, there is high interest of their role in the disease. But studies involving real-world, heterogeneous MS populations are lacking, the researchers noted.

To take a broader look at the issue, Dr. Sotirchos and colleagues conducted a cross-sectional evaluation of 6,968 people with MS in the Multiple Sclerosis Partners Advancing Technology and Health Solutions (MS PATHS), a large network of MS centers in the United States and Europe.

Participants’ baseline serum neurofilament light chain levels were compared with those of 201 healthy controls in the cohort using a novel, high-throughput immunoassay (Siemens Healthineers).

Of those with MS, 1,202 (17.2%) showed elevated serum neurofilament light chain levels, above the age-specific 97.5th percentile derived from the healthy controls.

A look at key factors associated with elevations showed significant links to having progressive MS (odds ratio, 1.63), non-White race (OR, 1.43), type 2 diabetes (OR, 1.89), and smoking (current vs. never smoker; OR, 1.49).

Associations with age and symptom duration were somewhat complex, but overall, younger patients and those with shorter disease duration had the highest frequency of elevated serum neurofilament light chain levels.

Interestingly, those with a higher body mass index (BMI) showed a reduced odds of having elevated serum neurofilament light chain levels (OR, 0.83 per 5 kg/m² increase in BMI).

Evaluation of neuroperformance measures – including walking speed, manual dexterity and processing speed, and MRI data – showed that those with elevated serum neurofilament light chain levels had worse neurologic function, lower brain parenchymal fraction, lower thalamic volume, and higher T2 lesion volume (P < .001 for all).

Dr. Sotirchos noted that the higher rates of elevations in younger people, also observed in previous clinical trials, may reflect higher early-stage disease activity. “Generally, people who are younger and earlier in the course of disease tend to have more inflammatory disease activity in MS, and that could be what we’re capturing here, but we need to better understand the pathologic correlates of elevated serum neurofilament light chain levels.”

The lower levels of neurofilament light chain with higher BMI, also recently reported in another study, likewise need further investigation, including in healthy controls, Dr. Sotirchos added. “Having lower serum neurofilament light chain levels with increasing BMI could have to do with effects of blood volume and how the serum neurofilament light chain levels is distributed in the body,” he explained.

The findings suggest that interpretation of serum neurofilament light chain levels without accounting for BMI could result in false-negative or false-positive results, Dr. Sotirchos noted. “It will be important to further evaluate this observation in control populations and account for BMI in neurofilament light chain reference ranges.”

Dr. Sotirchos added that the 17% rate of elevated serum neurofilament light chain levels seen in people with MS in the study is likely an underestimate.

“This is a cross-sectional study and represents one sample per patient, so it is a snapshot in time,” he said. “With the nature of MS, we know that people’s levels fluctuate over time.” In addition, most patients were on disease-modifying therapy for MS, so serum neurofilament light chain elevations could have been suppressed.
 

Applying the findings to individual patients

Commenting on the findings, Jennifer Graves, MD, PhD, director of the neuroimmunology research program at the University of California, San Diego, said the study is an important addition to the ongoing evidence on serum neurofilament light chain in MS.

“The current presented research importantly addresses the gaps we have in understanding how best to apply serum filament light chain levels to individual patients and not just using them to assess group level means of outcome measures,” she said.

“The MS PATHS collaborative is looking at multiple factors (in addition to MS activity) that drive serum neurofilament light chain levels so meaningful and practical cutoffs for what’s abnormal can be created,” said Dr. Graves, who also directs the Rady Children’s Pediatric MS Clinic in San Diego.

Dr. Graves noted that the findings on BMI were unexpected. “Elevated BMI has been shown to be associated with greater brain atrophy and greater relapses and disability in MS participants, so to have an opposite effect with serum neurofilament light chain is interesting.

“My thoughts would be that obesity is somehow affecting measurable blood levels of this marker. I think it less likely BMI has a protective effect against neurodegeneration given the observations with other MS outcome measures,” she added. 
 

Future research

In terms of future directions, Dr. Sotirchos noted that the researchers are following the group longitudinally to further assess changes in neurofilament light chain over time, and will be looking at associations with longitudinal, clinical, and radiologic outcomes.

The current research, meanwhile, offers important insights in terms of developing precision reference ranges, he noted.

“It appears that reference ranges may need to account for sex, race, BMI, and comorbid/lifestyle factors,” Dr. Sotirchos said, “in order to potentially improve the performance of serum neurofilament light chain as a biomarker in MS and other neurological diseases.”

The study received funding from Biogen and the MS PATHS network receives funding from Biogen. Dr. Sotirchos has served on scientific advisory boards for Alexion, Viela Bio, and Genentech, and has received speaker honoraria from Viela Bio and Biogen. Dr. Graves has disclosed no relevant financial relationships.

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

Vitamin D deficiency detected at the time of multiple sclerosis (MS) diagnosis is associated with cognitive impairment and may also impact disability, according to new research that adds to the known adverse relationship between low vitamin D and MS.

“We confirmed that low vitamin D may affect not only early disability but also cognition in newly MS diagnosed patients,” said lead author Eleonora Virgilio, MD, of the MS Center, neurology unit, at the University of Eastern Piedmont, Novara, Italy.

“The possible effects of vitamin D on both cognition (in particular, information processing speed) and early disability in newly diagnosed MS patients needs to be further investigated because this association might represent a marker of future disability, supporting the need for prompt supplementation,” she said.

The findings were presented at the meeting held by the Americas Committee for Treatment and Research in Multiple Sclerosis.
 

Low vitamin D and MS

Previous studies have linked insufficient serum vitamin D with everything from the development of MS to activity and disease progression, but less has been reported on a specific link to the impairment of cognitive function, an important complication of MS.

“Cognitive impairment, and, in particular, slowed information processing speed, is very frequent in the MS population from the early stages of disease, and frequently underestimated,” Dr. Virgilio noted. “It has yet to be completely elucidated what the exact underlying mechanisms are.”

To evaluate the relationship, Dr. Virgilio and colleagues enrolled 60 patients in Italy with MS who were newly diagnosed and had serum vitamin D levels collected upon diagnosis. The participants were also tested at diagnosis with the Symbol Digit Modalities Test (SDMT) for information processing speed, which is a hallmark of the cognitive impairment that can occur in MS and is typically the first cognitive domain to show effects of the disease.

Among the patients, 40 were female and the mean age at diagnosis was 39.5 years; 90% had relapsing remitting MS at baseline and 10% had progressive MS. Their median Expanded Disability Status Scale score at diagnosis was 1.5.

At baseline, as many as 85% of the participants (51) had low serum vitamin D levels, defined as below 30 ng/mL, which Dr. Virgilio noted is consistent with other rates reported among people with MS in the Lombardy region of Italy, where the study was conducted.

The patients had a mean vitamin D level of 21.17 ng/mL (± 10.02), with 51.7% considered to have a deficiency (less than 20 ng/mL) and 33.3% with an insufficiency (20-30 ng/mL).

Of the patients, 16 (27%) had cognitive impairment, defined as a z score of 1.5 or less. Their mean raw SDMT score was 46.50 (± 14.73) and mean z score was –0.62 (± 1.29).

Importantly, those with cognitive impairment were significantly more likely to have severe hypovitaminosis D, compared with those with sufficient vitamin D levels, none of whom showed cognitive impairment (P = .02).

Furthermore, vitamin D levels positively correlated with SDMT raw values (P = .001) and z score (P = .008).

Over a mean follow-up of 2 years, a significant correlation was observed between serum vitamin D levels at diagnosis and early disability on the MS severity score (MSSS; P = .02) and a weak correlation with age-related MSSS (ARMSS; P = .08) at the last clinical follow-up.

Dr. Virgilio noted that factors including disease treatment effects or other factors could have played a role in the weaker results. “It is possible that the linear correlation we found was not as strong as expected [because of] an effect of treatment with disease-modifying therapies or vitamin D supplementation, or because of the short follow-up available at the moment for our population – only for a mean period of 2 years after MS diagnosis.”

The mechanisms for vitamin D deficiency in the MS population are likely multifactorial, with genetic as well as environmental links, she noted.

“The immunomodulatory effects of vitamin D are well known,” Dr. Virgilio said.

“Vitamin D was already linked to cognitive function in other neurodegenerative diseases, [including] Alzheimer’s disease, but more importantly, also in other autoimmune diseases, such as systemic lupus erythematosus,” she explained.
 

Vitamin D also linked to long-term cognitive function

The study adds to recent research showing longer-term effects of vitamin D deficiency and cognitive impairment in MS: In the longitudinal BENEFIT trial published in 2020, researchers following 278 patients with MS over the course of 11 years found that a 50 ng/L higher mean vitamin D level in the first 2 years of the study was associated with a 65% lower odds of a poor performance on Paced Auditory Serial Addition Test scores at the 11-year follow-up.

That study also looked at neurofilament light chain concentrations, which are associated with MS disease activity, and found they were 20% lower among those with higher vitamin D at baseline. Smokers also had lower cognitive scores.

“Lower vitamin D and smoking after clinical onset predicted worse long-term cognitive function and neuronal integrity in patients with MS,” the authors concluded.

The authors disclosed no relevant financial relationships.

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

Vitamin D deficiency detected at the time of multiple sclerosis (MS) diagnosis is associated with cognitive impairment and may also impact disability, according to new research that adds to the known adverse relationship between low vitamin D and MS.

“We confirmed that low vitamin D may affect not only early disability but also cognition in newly MS diagnosed patients,” said lead author Eleonora Virgilio, MD, of the MS Center, neurology unit, at the University of Eastern Piedmont, Novara, Italy.

“The possible effects of vitamin D on both cognition (in particular, information processing speed) and early disability in newly diagnosed MS patients needs to be further investigated because this association might represent a marker of future disability, supporting the need for prompt supplementation,” she said.

The findings were presented at the meeting held by the Americas Committee for Treatment and Research in Multiple Sclerosis.
 

Low vitamin D and MS

Previous studies have linked insufficient serum vitamin D with everything from the development of MS to activity and disease progression, but less has been reported on a specific link to the impairment of cognitive function, an important complication of MS.

“Cognitive impairment, and, in particular, slowed information processing speed, is very frequent in the MS population from the early stages of disease, and frequently underestimated,” Dr. Virgilio noted. “It has yet to be completely elucidated what the exact underlying mechanisms are.”

To evaluate the relationship, Dr. Virgilio and colleagues enrolled 60 patients in Italy with MS who were newly diagnosed and had serum vitamin D levels collected upon diagnosis. The participants were also tested at diagnosis with the Symbol Digit Modalities Test (SDMT) for information processing speed, which is a hallmark of the cognitive impairment that can occur in MS and is typically the first cognitive domain to show effects of the disease.

Among the patients, 40 were female and the mean age at diagnosis was 39.5 years; 90% had relapsing remitting MS at baseline and 10% had progressive MS. Their median Expanded Disability Status Scale score at diagnosis was 1.5.

At baseline, as many as 85% of the participants (51) had low serum vitamin D levels, defined as below 30 ng/mL, which Dr. Virgilio noted is consistent with other rates reported among people with MS in the Lombardy region of Italy, where the study was conducted.

The patients had a mean vitamin D level of 21.17 ng/mL (± 10.02), with 51.7% considered to have a deficiency (less than 20 ng/mL) and 33.3% with an insufficiency (20-30 ng/mL).

Of the patients, 16 (27%) had cognitive impairment, defined as a z score of 1.5 or less. Their mean raw SDMT score was 46.50 (± 14.73) and mean z score was –0.62 (± 1.29).

Importantly, those with cognitive impairment were significantly more likely to have severe hypovitaminosis D, compared with those with sufficient vitamin D levels, none of whom showed cognitive impairment (P = .02).

Furthermore, vitamin D levels positively correlated with SDMT raw values (P = .001) and z score (P = .008).

Over a mean follow-up of 2 years, a significant correlation was observed between serum vitamin D levels at diagnosis and early disability on the MS severity score (MSSS; P = .02) and a weak correlation with age-related MSSS (ARMSS; P = .08) at the last clinical follow-up.

Dr. Virgilio noted that factors including disease treatment effects or other factors could have played a role in the weaker results. “It is possible that the linear correlation we found was not as strong as expected [because of] an effect of treatment with disease-modifying therapies or vitamin D supplementation, or because of the short follow-up available at the moment for our population – only for a mean period of 2 years after MS diagnosis.”

The mechanisms for vitamin D deficiency in the MS population are likely multifactorial, with genetic as well as environmental links, she noted.

“The immunomodulatory effects of vitamin D are well known,” Dr. Virgilio said.

“Vitamin D was already linked to cognitive function in other neurodegenerative diseases, [including] Alzheimer’s disease, but more importantly, also in other autoimmune diseases, such as systemic lupus erythematosus,” she explained.
 

Vitamin D also linked to long-term cognitive function

The study adds to recent research showing longer-term effects of vitamin D deficiency and cognitive impairment in MS: In the longitudinal BENEFIT trial published in 2020, researchers following 278 patients with MS over the course of 11 years found that a 50 ng/L higher mean vitamin D level in the first 2 years of the study was associated with a 65% lower odds of a poor performance on Paced Auditory Serial Addition Test scores at the 11-year follow-up.

That study also looked at neurofilament light chain concentrations, which are associated with MS disease activity, and found they were 20% lower among those with higher vitamin D at baseline. Smokers also had lower cognitive scores.

“Lower vitamin D and smoking after clinical onset predicted worse long-term cognitive function and neuronal integrity in patients with MS,” the authors concluded.

The authors disclosed no relevant financial relationships.

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

Vitamin D deficiency detected at the time of multiple sclerosis (MS) diagnosis is associated with cognitive impairment and may also impact disability, according to new research that adds to the known adverse relationship between low vitamin D and MS.

“We confirmed that low vitamin D may affect not only early disability but also cognition in newly MS diagnosed patients,” said lead author Eleonora Virgilio, MD, of the MS Center, neurology unit, at the University of Eastern Piedmont, Novara, Italy.

“The possible effects of vitamin D on both cognition (in particular, information processing speed) and early disability in newly diagnosed MS patients needs to be further investigated because this association might represent a marker of future disability, supporting the need for prompt supplementation,” she said.

The findings were presented at the meeting held by the Americas Committee for Treatment and Research in Multiple Sclerosis.
 

Low vitamin D and MS

Previous studies have linked insufficient serum vitamin D with everything from the development of MS to activity and disease progression, but less has been reported on a specific link to the impairment of cognitive function, an important complication of MS.

“Cognitive impairment, and, in particular, slowed information processing speed, is very frequent in the MS population from the early stages of disease, and frequently underestimated,” Dr. Virgilio noted. “It has yet to be completely elucidated what the exact underlying mechanisms are.”

To evaluate the relationship, Dr. Virgilio and colleagues enrolled 60 patients in Italy with MS who were newly diagnosed and had serum vitamin D levels collected upon diagnosis. The participants were also tested at diagnosis with the Symbol Digit Modalities Test (SDMT) for information processing speed, which is a hallmark of the cognitive impairment that can occur in MS and is typically the first cognitive domain to show effects of the disease.

Among the patients, 40 were female and the mean age at diagnosis was 39.5 years; 90% had relapsing remitting MS at baseline and 10% had progressive MS. Their median Expanded Disability Status Scale score at diagnosis was 1.5.

At baseline, as many as 85% of the participants (51) had low serum vitamin D levels, defined as below 30 ng/mL, which Dr. Virgilio noted is consistent with other rates reported among people with MS in the Lombardy region of Italy, where the study was conducted.

The patients had a mean vitamin D level of 21.17 ng/mL (± 10.02), with 51.7% considered to have a deficiency (less than 20 ng/mL) and 33.3% with an insufficiency (20-30 ng/mL).

Of the patients, 16 (27%) had cognitive impairment, defined as a z score of 1.5 or less. Their mean raw SDMT score was 46.50 (± 14.73) and mean z score was –0.62 (± 1.29).

Importantly, those with cognitive impairment were significantly more likely to have severe hypovitaminosis D, compared with those with sufficient vitamin D levels, none of whom showed cognitive impairment (P = .02).

Furthermore, vitamin D levels positively correlated with SDMT raw values (P = .001) and z score (P = .008).

Over a mean follow-up of 2 years, a significant correlation was observed between serum vitamin D levels at diagnosis and early disability on the MS severity score (MSSS; P = .02) and a weak correlation with age-related MSSS (ARMSS; P = .08) at the last clinical follow-up.

Dr. Virgilio noted that factors including disease treatment effects or other factors could have played a role in the weaker results. “It is possible that the linear correlation we found was not as strong as expected [because of] an effect of treatment with disease-modifying therapies or vitamin D supplementation, or because of the short follow-up available at the moment for our population – only for a mean period of 2 years after MS diagnosis.”

The mechanisms for vitamin D deficiency in the MS population are likely multifactorial, with genetic as well as environmental links, she noted.

“The immunomodulatory effects of vitamin D are well known,” Dr. Virgilio said.

“Vitamin D was already linked to cognitive function in other neurodegenerative diseases, [including] Alzheimer’s disease, but more importantly, also in other autoimmune diseases, such as systemic lupus erythematosus,” she explained.
 

Vitamin D also linked to long-term cognitive function

The study adds to recent research showing longer-term effects of vitamin D deficiency and cognitive impairment in MS: In the longitudinal BENEFIT trial published in 2020, researchers following 278 patients with MS over the course of 11 years found that a 50 ng/L higher mean vitamin D level in the first 2 years of the study was associated with a 65% lower odds of a poor performance on Paced Auditory Serial Addition Test scores at the 11-year follow-up.

That study also looked at neurofilament light chain concentrations, which are associated with MS disease activity, and found they were 20% lower among those with higher vitamin D at baseline. Smokers also had lower cognitive scores.

“Lower vitamin D and smoking after clinical onset predicted worse long-term cognitive function and neuronal integrity in patients with MS,” the authors concluded.

The authors disclosed no relevant financial relationships.

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

With chronic pain common among people with multiple sclerosis (MS), approximately 20% of patients report opioid use - despite warnings that the drugs are generally not recommended for the management of chronic pain and ongoing concerns of addiction, new research shows.

“This high level of opioid use supports that better pain management treatment options, including nonpharmacological options, are needed for people with MS and pain,” wrote the authors of the study, which was presented at ACTRIMS Forum 2021, held by the Americas Committee for Treatment and Research in Multiple Sclerosis.

Previous research has shown that more than 50% of people with MS report chronic pain that is serious enough to interfere with daily activities, employment, and quality of life. Many with MS report that pain is one of their worst symptoms, the authors noted.

With surprisingly few studies evaluating opioid use in the MS population, Cinda L. Hugos, PT, associate professor of neurology with the VA Portland Health Care System and the department of neurology, Oregon Health and Science University, Portland, and colleagues investigated the issue in a sample of patients participating in a U.S. multisite MS fatigue management trial conducted between 2013 and 2014.

Of the 281 participants with MS in the study, 58 patients (20.6%) reported using prescription opioids. Among them, most – 44 (76%) – reported regular daily use, 10 (17%) reported using the drugs only as needed, 3 (5%) reported only short-term use, including after recent injury or dental surgery, and 1 provided incomplete information.

Those who reported opioid use had significantly worse fatigue scores on the Modified Fatigue Impact Scale (P = .015) and worse pain scores (P < .0001).

There were no significant differences in terms of age (mean age, 53 years), gender (69% were female), or race (in both groups, about 76% were White). No significant differences were seen in disability or depression scores in the opioid users versus nonusers.

“In this sample of people with multiple sclerosis who self-reported fatigue and volunteered to join an MS fatigue management research study, more than one in five reported using prescription opioids and nearly one in six used opioids daily,” the authors wrote. “Opioid users had more pain and fatigue than nonusers.”

Commenting on the study, Jeffrey Cohen, MD, president of ACTRIMS, said that the findings are consistent with his observations that “in the general population, opioids often are used to treat chronic pain in people with MS.”

But they’re not getting the drugs from his clinic. “We do not prescribe opioids in our clinic, referring such patients to a chronic pain program,” Dr. Cohen said. “However, there clearly is need for better treatment options.”

A previous study on opioid use by people with MS, published in 2015, found even higher rates – 42% reported having ever used opioids, and 38% reported currently using opioids.

Although reports of opioid use by patients with MS have been lacking, more has been published on the emerging use of cannabis-related products. One recent study showed that nearly half of people with MS reported using a cannabis-based therapy for nerve-based pain and sleep disturbances.

Although cannabis is considered safer than opioids, the authors noted that it has its own significant drawback – a “paucity of provider guidance.”

“The range of perceived benefits and potential differential effects of THC and cannabinoid highlight the need for personalized, evidence-based guidelines regarding cannabinoid use,” they wrote.
 

Stretching program for spasticity shows benefits

With spasticity representing a key contributor to MS pain and affecting more than 80% of people with MS, Ms. Hugos and colleagues are developing an alternative to medication – a nonpharmacologic stretching regimen called Spasticity: Take Control” (STC).

Based on evidence-based strategies for the treatment of spasticity in MS, the program involves exercises with daily routines of 15-20 minutes over 6 months.

In a pilot study of 66 patients, also presented at the ACTRIMS meeting, the investigators reported that the program showed significant reductions in pain severity and interference, measured with the Brief Pain Inventory–Short Form, compared with a control consisting of range of motion instruction over 6 months.

The study also offered insights on the specific areas of pain. Among those who reported chronic pain (42% in the STC group and 63.3% in the range-of-motion group), the pain was most frequently reported in the lower back (74.3%), legs (68.6%), or lower back and legs (88.6%).

Ms. Hugos noted that the findings suggest a potentially important nonpharmacologic alternative to spasticity-related pain in MS.

“Stretching is the cornerstone treatment for spasticity from all causes, but there is very little information on stretching exercises in MS or any other conditions,” Ms. Hugos said. “[Our] pilot study is the first and only study using a standardized, daily stretching exercise program to treat MS spasticity,” she said.

“A fully powered study is needed to better understand the impact of different types of exercise on pain severity and interference in multiple sclerosis,” she noted.

Ms. Hugos has received consulting fees from Greenwich Biosciences, Evidera, and Techspert.io. Dr. Cohen has received personal compensation for consulting for Adamas, Atara, Bristol-Myers Squibb, Convelo, MedDay, and Mylan.

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

With chronic pain common among people with multiple sclerosis (MS), approximately 20% of patients report opioid use - despite warnings that the drugs are generally not recommended for the management of chronic pain and ongoing concerns of addiction, new research shows.

“This high level of opioid use supports that better pain management treatment options, including nonpharmacological options, are needed for people with MS and pain,” wrote the authors of the study, which was presented at ACTRIMS Forum 2021, held by the Americas Committee for Treatment and Research in Multiple Sclerosis.

Previous research has shown that more than 50% of people with MS report chronic pain that is serious enough to interfere with daily activities, employment, and quality of life. Many with MS report that pain is one of their worst symptoms, the authors noted.

With surprisingly few studies evaluating opioid use in the MS population, Cinda L. Hugos, PT, associate professor of neurology with the VA Portland Health Care System and the department of neurology, Oregon Health and Science University, Portland, and colleagues investigated the issue in a sample of patients participating in a U.S. multisite MS fatigue management trial conducted between 2013 and 2014.

Of the 281 participants with MS in the study, 58 patients (20.6%) reported using prescription opioids. Among them, most – 44 (76%) – reported regular daily use, 10 (17%) reported using the drugs only as needed, 3 (5%) reported only short-term use, including after recent injury or dental surgery, and 1 provided incomplete information.

Those who reported opioid use had significantly worse fatigue scores on the Modified Fatigue Impact Scale (P = .015) and worse pain scores (P < .0001).

There were no significant differences in terms of age (mean age, 53 years), gender (69% were female), or race (in both groups, about 76% were White). No significant differences were seen in disability or depression scores in the opioid users versus nonusers.

“In this sample of people with multiple sclerosis who self-reported fatigue and volunteered to join an MS fatigue management research study, more than one in five reported using prescription opioids and nearly one in six used opioids daily,” the authors wrote. “Opioid users had more pain and fatigue than nonusers.”

Commenting on the study, Jeffrey Cohen, MD, president of ACTRIMS, said that the findings are consistent with his observations that “in the general population, opioids often are used to treat chronic pain in people with MS.”

But they’re not getting the drugs from his clinic. “We do not prescribe opioids in our clinic, referring such patients to a chronic pain program,” Dr. Cohen said. “However, there clearly is need for better treatment options.”

A previous study on opioid use by people with MS, published in 2015, found even higher rates – 42% reported having ever used opioids, and 38% reported currently using opioids.

Although reports of opioid use by patients with MS have been lacking, more has been published on the emerging use of cannabis-related products. One recent study showed that nearly half of people with MS reported using a cannabis-based therapy for nerve-based pain and sleep disturbances.

Although cannabis is considered safer than opioids, the authors noted that it has its own significant drawback – a “paucity of provider guidance.”

“The range of perceived benefits and potential differential effects of THC and cannabinoid highlight the need for personalized, evidence-based guidelines regarding cannabinoid use,” they wrote.
 

Stretching program for spasticity shows benefits

With spasticity representing a key contributor to MS pain and affecting more than 80% of people with MS, Ms. Hugos and colleagues are developing an alternative to medication – a nonpharmacologic stretching regimen called Spasticity: Take Control” (STC).

Based on evidence-based strategies for the treatment of spasticity in MS, the program involves exercises with daily routines of 15-20 minutes over 6 months.

In a pilot study of 66 patients, also presented at the ACTRIMS meeting, the investigators reported that the program showed significant reductions in pain severity and interference, measured with the Brief Pain Inventory–Short Form, compared with a control consisting of range of motion instruction over 6 months.

The study also offered insights on the specific areas of pain. Among those who reported chronic pain (42% in the STC group and 63.3% in the range-of-motion group), the pain was most frequently reported in the lower back (74.3%), legs (68.6%), or lower back and legs (88.6%).

Ms. Hugos noted that the findings suggest a potentially important nonpharmacologic alternative to spasticity-related pain in MS.

“Stretching is the cornerstone treatment for spasticity from all causes, but there is very little information on stretching exercises in MS or any other conditions,” Ms. Hugos said. “[Our] pilot study is the first and only study using a standardized, daily stretching exercise program to treat MS spasticity,” she said.

“A fully powered study is needed to better understand the impact of different types of exercise on pain severity and interference in multiple sclerosis,” she noted.

Ms. Hugos has received consulting fees from Greenwich Biosciences, Evidera, and Techspert.io. Dr. Cohen has received personal compensation for consulting for Adamas, Atara, Bristol-Myers Squibb, Convelo, MedDay, and Mylan.

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

With chronic pain common among people with multiple sclerosis (MS), approximately 20% of patients report opioid use - despite warnings that the drugs are generally not recommended for the management of chronic pain and ongoing concerns of addiction, new research shows.

“This high level of opioid use supports that better pain management treatment options, including nonpharmacological options, are needed for people with MS and pain,” wrote the authors of the study, which was presented at ACTRIMS Forum 2021, held by the Americas Committee for Treatment and Research in Multiple Sclerosis.

Previous research has shown that more than 50% of people with MS report chronic pain that is serious enough to interfere with daily activities, employment, and quality of life. Many with MS report that pain is one of their worst symptoms, the authors noted.

With surprisingly few studies evaluating opioid use in the MS population, Cinda L. Hugos, PT, associate professor of neurology with the VA Portland Health Care System and the department of neurology, Oregon Health and Science University, Portland, and colleagues investigated the issue in a sample of patients participating in a U.S. multisite MS fatigue management trial conducted between 2013 and 2014.

Of the 281 participants with MS in the study, 58 patients (20.6%) reported using prescription opioids. Among them, most – 44 (76%) – reported regular daily use, 10 (17%) reported using the drugs only as needed, 3 (5%) reported only short-term use, including after recent injury or dental surgery, and 1 provided incomplete information.

Those who reported opioid use had significantly worse fatigue scores on the Modified Fatigue Impact Scale (P = .015) and worse pain scores (P < .0001).

There were no significant differences in terms of age (mean age, 53 years), gender (69% were female), or race (in both groups, about 76% were White). No significant differences were seen in disability or depression scores in the opioid users versus nonusers.

“In this sample of people with multiple sclerosis who self-reported fatigue and volunteered to join an MS fatigue management research study, more than one in five reported using prescription opioids and nearly one in six used opioids daily,” the authors wrote. “Opioid users had more pain and fatigue than nonusers.”

Commenting on the study, Jeffrey Cohen, MD, president of ACTRIMS, said that the findings are consistent with his observations that “in the general population, opioids often are used to treat chronic pain in people with MS.”

But they’re not getting the drugs from his clinic. “We do not prescribe opioids in our clinic, referring such patients to a chronic pain program,” Dr. Cohen said. “However, there clearly is need for better treatment options.”

A previous study on opioid use by people with MS, published in 2015, found even higher rates – 42% reported having ever used opioids, and 38% reported currently using opioids.

Although reports of opioid use by patients with MS have been lacking, more has been published on the emerging use of cannabis-related products. One recent study showed that nearly half of people with MS reported using a cannabis-based therapy for nerve-based pain and sleep disturbances.

Although cannabis is considered safer than opioids, the authors noted that it has its own significant drawback – a “paucity of provider guidance.”

“The range of perceived benefits and potential differential effects of THC and cannabinoid highlight the need for personalized, evidence-based guidelines regarding cannabinoid use,” they wrote.
 

Stretching program for spasticity shows benefits

With spasticity representing a key contributor to MS pain and affecting more than 80% of people with MS, Ms. Hugos and colleagues are developing an alternative to medication – a nonpharmacologic stretching regimen called Spasticity: Take Control” (STC).

Based on evidence-based strategies for the treatment of spasticity in MS, the program involves exercises with daily routines of 15-20 minutes over 6 months.

In a pilot study of 66 patients, also presented at the ACTRIMS meeting, the investigators reported that the program showed significant reductions in pain severity and interference, measured with the Brief Pain Inventory–Short Form, compared with a control consisting of range of motion instruction over 6 months.

The study also offered insights on the specific areas of pain. Among those who reported chronic pain (42% in the STC group and 63.3% in the range-of-motion group), the pain was most frequently reported in the lower back (74.3%), legs (68.6%), or lower back and legs (88.6%).

Ms. Hugos noted that the findings suggest a potentially important nonpharmacologic alternative to spasticity-related pain in MS.

“Stretching is the cornerstone treatment for spasticity from all causes, but there is very little information on stretching exercises in MS or any other conditions,” Ms. Hugos said. “[Our] pilot study is the first and only study using a standardized, daily stretching exercise program to treat MS spasticity,” she said.

“A fully powered study is needed to better understand the impact of different types of exercise on pain severity and interference in multiple sclerosis,” she noted.

Ms. Hugos has received consulting fees from Greenwich Biosciences, Evidera, and Techspert.io. Dr. Cohen has received personal compensation for consulting for Adamas, Atara, Bristol-Myers Squibb, Convelo, MedDay, and Mylan.

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

Stroke, dementias, and migraine cause the most disability among neurological disorders in the United States, according to new findings derived from the 2017 Global Burden of Disease study. 

The authors of the analysis, led by Valery Feigin, MD, PhD, of New Zealand’s National Institute for Stroke and Applied Neurosciences, and published in the February 2021 issue of JAMA Neurology, looked at prevalence, incidence, mortality, and disability-adjusted life years for 14 neurological disorders across 50 states between 1990 and 2017. The diseases included in the analysis were stroke, Alzheimer’s disease and other dementias, Parkinson’s disease, epilepsy, multiple sclerosis, motor neuron disease, headaches, traumatic brain injury, spinal cord injuries, brain and other nervous system cancers, meningitis, encephalitis, and tetanus.
 

Tracking the burden of neurologic diseases

Dr. Feigin and colleagues estimated that a full 60% of the U.S. population lives with one or more of these disorders, a figure much greater than previous estimates for neurological disease burden nationwide. Tension-type headache and migraine were the most prevalent in the analysis by Dr. Feigin and colleagues. During the study period, they found, prevalence, incidence, and disability burden of nearly all the included disorders increased, with the exception of brain and spinal cord injuries, meningitis, and encephalitis.

The researchers attributed most of the rise in noncommunicable neurological diseases to population aging. An age-standardized analysis found trends for stroke and Alzheimer’s disease and other dementias to be declining or flat. Age-standardized stroke incidence dropped by 16% from 1990 to 2017, while stroke mortality declined by nearly a third, and stroke disability by a quarter. Age-standardized incidence of Alzheimer’s disease and other dementias dropped by 12%, and their prevalence by 13%, during the study period, though dementia mortality and disability were seen increasing.

The authors surmised that the age-standardized declines in stroke and dementias could reflect that “primary prevention of these disorders are beginning to show an influence.” With dementia, which is linked to cognitive reserve and education, “improving educational levels of cohort reaching the age groups at greatest risk of disease may also be contributing to a modest decline over time,” Dr. Feigin and his colleagues wrote.

Parkinson’s disease and multiple sclerosis, meanwhile, were both seen rising in incidence, prevalence, and disability adjusted life years (DALYs) even with age-standardized figures. The United States saw comparatively more disability in 2017 from dementias, Parkinson’s disease, epilepsy, multiple sclerosis, motor neuron disease, and headache disorders, which together comprised 6.7% of DALYs, compared with 4.4% globally; these also accounted for a higher share of mortality in the U.S. than worldwide. The authors attributed at least some of the difference to better case ascertainment in the U.S.
 

Regional variations

The researchers also reported variations in disease burden by state and region. While previous studies have identified a “stroke belt” concentrated in North Carolina, South Carolina, and Georgia, the new findings point to stroke disability highest in Alabama, Arkansas, and Mississippi, and mortality highest in Alabama, Mississippi, and South Carolina. The researchers noted increases in dementia mortality in these states, “likely attributable to the reciprocal association between stroke and dementia.”

Northern states saw higher burdens of multiple sclerosis compared with the rest of the country, while eastern states had higher rates of Parkinson’s disease.

Such regional and state-by state variations, Dr. Feigin and colleagues wrote in their analysis, “may be associated with differences in the case ascertainment, as well as access to health care; racial/ethnic, genetic, and socioeconomic diversity; quality and comprehensiveness of preventive strategies; and risk factor distribution.”

The researchers noted as a limitation of their study that the 14 diseases captured were not an exhaustive list of neurological conditions; chronic lower back pain, a condition included in a previous major study of the burden of neurological disease in the United States, was omitted, as were restless legs syndrome and peripheral neuropathy. The researchers cited changes to coding practice in the U.S. and accuracy of medical claims data as potential limitations of their analysis. The Global Burden of Disease study is funded by the Bill and Melinda Gates Foundation, and several of Dr. Feigin’s coauthors reported financial relationships with industry.
 

Time to adjust the stroke belt?

Amelia Boehme, PhD, a stroke epidemiologist at Columbia University Mailman School of Public Health in New York, said in an interview that the current study added to recent findings showing surprising local variability in stroke prevalence, incidence, and mortality. “What we had always conceptually thought of as the ‘stroke belt’ isn’t necessarily the case,” Dr. Boehme said, but is rather subject to local, county-by-county variations. “Looking at the data here in conjunction with what previous authors have found, it raises some questions as to whether or not state-level data is giving a completely accurate picture, and whether we need to start looking at the county level and adjust for populations and age.” Importantly, Dr. Boehme said, data collected in the Global Burden of Disease study tends to be exceptionally rigorous and systematic, adding weight to Dr. Feigin and colleagues’ suggestions that prevention efforts may be making a dent in stroke and dementia. 

“More data is always needed before we start to say we’re seeing things change,” Dr. Boehme noted. “But any glimmer of optimism is welcome, especially with regard to interventions that have been put in place, to allow us to build on those interventions.”

Dr. Boehme disclosed no financial conflicts of interest.

Stroke, dementias, and migraine cause the most disability among neurological disorders in the United States, according to new findings derived from the 2017 Global Burden of Disease study. 

The authors of the analysis, led by Valery Feigin, MD, PhD, of New Zealand’s National Institute for Stroke and Applied Neurosciences, and published in the February 2021 issue of JAMA Neurology, looked at prevalence, incidence, mortality, and disability-adjusted life years for 14 neurological disorders across 50 states between 1990 and 2017. The diseases included in the analysis were stroke, Alzheimer’s disease and other dementias, Parkinson’s disease, epilepsy, multiple sclerosis, motor neuron disease, headaches, traumatic brain injury, spinal cord injuries, brain and other nervous system cancers, meningitis, encephalitis, and tetanus.
 

Tracking the burden of neurologic diseases

Dr. Feigin and colleagues estimated that a full 60% of the U.S. population lives with one or more of these disorders, a figure much greater than previous estimates for neurological disease burden nationwide. Tension-type headache and migraine were the most prevalent in the analysis by Dr. Feigin and colleagues. During the study period, they found, prevalence, incidence, and disability burden of nearly all the included disorders increased, with the exception of brain and spinal cord injuries, meningitis, and encephalitis.

The researchers attributed most of the rise in noncommunicable neurological diseases to population aging. An age-standardized analysis found trends for stroke and Alzheimer’s disease and other dementias to be declining or flat. Age-standardized stroke incidence dropped by 16% from 1990 to 2017, while stroke mortality declined by nearly a third, and stroke disability by a quarter. Age-standardized incidence of Alzheimer’s disease and other dementias dropped by 12%, and their prevalence by 13%, during the study period, though dementia mortality and disability were seen increasing.

The authors surmised that the age-standardized declines in stroke and dementias could reflect that “primary prevention of these disorders are beginning to show an influence.” With dementia, which is linked to cognitive reserve and education, “improving educational levels of cohort reaching the age groups at greatest risk of disease may also be contributing to a modest decline over time,” Dr. Feigin and his colleagues wrote.

Parkinson’s disease and multiple sclerosis, meanwhile, were both seen rising in incidence, prevalence, and disability adjusted life years (DALYs) even with age-standardized figures. The United States saw comparatively more disability in 2017 from dementias, Parkinson’s disease, epilepsy, multiple sclerosis, motor neuron disease, and headache disorders, which together comprised 6.7% of DALYs, compared with 4.4% globally; these also accounted for a higher share of mortality in the U.S. than worldwide. The authors attributed at least some of the difference to better case ascertainment in the U.S.
 

Regional variations

The researchers also reported variations in disease burden by state and region. While previous studies have identified a “stroke belt” concentrated in North Carolina, South Carolina, and Georgia, the new findings point to stroke disability highest in Alabama, Arkansas, and Mississippi, and mortality highest in Alabama, Mississippi, and South Carolina. The researchers noted increases in dementia mortality in these states, “likely attributable to the reciprocal association between stroke and dementia.”

Northern states saw higher burdens of multiple sclerosis compared with the rest of the country, while eastern states had higher rates of Parkinson’s disease.

Such regional and state-by state variations, Dr. Feigin and colleagues wrote in their analysis, “may be associated with differences in the case ascertainment, as well as access to health care; racial/ethnic, genetic, and socioeconomic diversity; quality and comprehensiveness of preventive strategies; and risk factor distribution.”

The researchers noted as a limitation of their study that the 14 diseases captured were not an exhaustive list of neurological conditions; chronic lower back pain, a condition included in a previous major study of the burden of neurological disease in the United States, was omitted, as were restless legs syndrome and peripheral neuropathy. The researchers cited changes to coding practice in the U.S. and accuracy of medical claims data as potential limitations of their analysis. The Global Burden of Disease study is funded by the Bill and Melinda Gates Foundation, and several of Dr. Feigin’s coauthors reported financial relationships with industry.
 

Time to adjust the stroke belt?

Amelia Boehme, PhD, a stroke epidemiologist at Columbia University Mailman School of Public Health in New York, said in an interview that the current study added to recent findings showing surprising local variability in stroke prevalence, incidence, and mortality. “What we had always conceptually thought of as the ‘stroke belt’ isn’t necessarily the case,” Dr. Boehme said, but is rather subject to local, county-by-county variations. “Looking at the data here in conjunction with what previous authors have found, it raises some questions as to whether or not state-level data is giving a completely accurate picture, and whether we need to start looking at the county level and adjust for populations and age.” Importantly, Dr. Boehme said, data collected in the Global Burden of Disease study tends to be exceptionally rigorous and systematic, adding weight to Dr. Feigin and colleagues’ suggestions that prevention efforts may be making a dent in stroke and dementia. 

“More data is always needed before we start to say we’re seeing things change,” Dr. Boehme noted. “But any glimmer of optimism is welcome, especially with regard to interventions that have been put in place, to allow us to build on those interventions.”

Dr. Boehme disclosed no financial conflicts of interest.

Stroke, dementias, and migraine cause the most disability among neurological disorders in the United States, according to new findings derived from the 2017 Global Burden of Disease study. 

The authors of the analysis, led by Valery Feigin, MD, PhD, of New Zealand’s National Institute for Stroke and Applied Neurosciences, and published in the February 2021 issue of JAMA Neurology, looked at prevalence, incidence, mortality, and disability-adjusted life years for 14 neurological disorders across 50 states between 1990 and 2017. The diseases included in the analysis were stroke, Alzheimer’s disease and other dementias, Parkinson’s disease, epilepsy, multiple sclerosis, motor neuron disease, headaches, traumatic brain injury, spinal cord injuries, brain and other nervous system cancers, meningitis, encephalitis, and tetanus.
 

Tracking the burden of neurologic diseases

Dr. Feigin and colleagues estimated that a full 60% of the U.S. population lives with one or more of these disorders, a figure much greater than previous estimates for neurological disease burden nationwide. Tension-type headache and migraine were the most prevalent in the analysis by Dr. Feigin and colleagues. During the study period, they found, prevalence, incidence, and disability burden of nearly all the included disorders increased, with the exception of brain and spinal cord injuries, meningitis, and encephalitis.

The researchers attributed most of the rise in noncommunicable neurological diseases to population aging. An age-standardized analysis found trends for stroke and Alzheimer’s disease and other dementias to be declining or flat. Age-standardized stroke incidence dropped by 16% from 1990 to 2017, while stroke mortality declined by nearly a third, and stroke disability by a quarter. Age-standardized incidence of Alzheimer’s disease and other dementias dropped by 12%, and their prevalence by 13%, during the study period, though dementia mortality and disability were seen increasing.

The authors surmised that the age-standardized declines in stroke and dementias could reflect that “primary prevention of these disorders are beginning to show an influence.” With dementia, which is linked to cognitive reserve and education, “improving educational levels of cohort reaching the age groups at greatest risk of disease may also be contributing to a modest decline over time,” Dr. Feigin and his colleagues wrote.

Parkinson’s disease and multiple sclerosis, meanwhile, were both seen rising in incidence, prevalence, and disability adjusted life years (DALYs) even with age-standardized figures. The United States saw comparatively more disability in 2017 from dementias, Parkinson’s disease, epilepsy, multiple sclerosis, motor neuron disease, and headache disorders, which together comprised 6.7% of DALYs, compared with 4.4% globally; these also accounted for a higher share of mortality in the U.S. than worldwide. The authors attributed at least some of the difference to better case ascertainment in the U.S.
 

Regional variations

The researchers also reported variations in disease burden by state and region. While previous studies have identified a “stroke belt” concentrated in North Carolina, South Carolina, and Georgia, the new findings point to stroke disability highest in Alabama, Arkansas, and Mississippi, and mortality highest in Alabama, Mississippi, and South Carolina. The researchers noted increases in dementia mortality in these states, “likely attributable to the reciprocal association between stroke and dementia.”

Northern states saw higher burdens of multiple sclerosis compared with the rest of the country, while eastern states had higher rates of Parkinson’s disease.

Such regional and state-by state variations, Dr. Feigin and colleagues wrote in their analysis, “may be associated with differences in the case ascertainment, as well as access to health care; racial/ethnic, genetic, and socioeconomic diversity; quality and comprehensiveness of preventive strategies; and risk factor distribution.”

The researchers noted as a limitation of their study that the 14 diseases captured were not an exhaustive list of neurological conditions; chronic lower back pain, a condition included in a previous major study of the burden of neurological disease in the United States, was omitted, as were restless legs syndrome and peripheral neuropathy. The researchers cited changes to coding practice in the U.S. and accuracy of medical claims data as potential limitations of their analysis. The Global Burden of Disease study is funded by the Bill and Melinda Gates Foundation, and several of Dr. Feigin’s coauthors reported financial relationships with industry.
 

Time to adjust the stroke belt?

Amelia Boehme, PhD, a stroke epidemiologist at Columbia University Mailman School of Public Health in New York, said in an interview that the current study added to recent findings showing surprising local variability in stroke prevalence, incidence, and mortality. “What we had always conceptually thought of as the ‘stroke belt’ isn’t necessarily the case,” Dr. Boehme said, but is rather subject to local, county-by-county variations. “Looking at the data here in conjunction with what previous authors have found, it raises some questions as to whether or not state-level data is giving a completely accurate picture, and whether we need to start looking at the county level and adjust for populations and age.” Importantly, Dr. Boehme said, data collected in the Global Burden of Disease study tends to be exceptionally rigorous and systematic, adding weight to Dr. Feigin and colleagues’ suggestions that prevention efforts may be making a dent in stroke and dementia. 

“More data is always needed before we start to say we’re seeing things change,” Dr. Boehme noted. “But any glimmer of optimism is welcome, especially with regard to interventions that have been put in place, to allow us to build on those interventions.”

Dr. Boehme disclosed no financial conflicts of interest.

Restoring movement following a stroke can be challenging, but recent proof-of-concept research may offer an effective way to do just that. Researchers behind the ongoing Cortimo trial successfully performed a procedure on a patient 2 years removed from a stroke, in which microelectrode arrays were implanted into his brain to decode signals driving motor function. These signals then allowed him to operate a powered brace worn on his paralyzed arm.

This news organization spoke with the trial’s principal investigator, Mijail D. Serruya, MD, PhD, an assistant professor of neurology at Thomas Jefferson University Hospital, Philadelphia, about the trial’s initial findings, what this technology may ultimately look like, and the implications for stroke patients in knowing that restorative interventions may be on the horizon.
 

How did you first get involved with implanting electrodes to help stroke patients with recovery?

I was involved in the first human application of a microelectrode array in a young man who had quadriplegia because of a spinal cord injury. We showed that we could record signal directly from his motor cortex and use it to move a cursor on the screen, and open and close a prosthetic hand and arm.

I was naive and thought that this would soon be a widely available clinical medical device. Now it’s nearly 15 years later, and while it certainly has been safely used in multiple labs to record signals from people with spinal cord injury, amyotrophic lateral sclerosis (ALS), or locked-in syndrome from a brain stem stroke, it still requires a team of technicians and a percutaneous connector. It really has not gotten out of the university.

A few years ago I spoke with Robert Rosenwasser, MD, chairman of the department of neurosurgery at Thomas Jefferson, who runs a very busy stroke center and performed the surgery in this trial. We put our heads together and said: “Maybe the time is now to see whether we can move this technology to this much more prevalent condition of a hemispheric stroke.” And that’s what we did.
 

How did the idea of using computer brain electrode interfaces begin?

Around 20 years ago, if you had someone who had severe paralysis and you wanted to restore movement, the question was, where can you get a good control signal from? Obviously, if someone can talk, they can use a voice-actuated system with speech recognition and maybe you can track their eye gaze. But if they’re trying to move their limbs, you want a motor control signal.

In someone who has end-stage ALS or a brain stem stroke, you can’t even record residual muscle activity; you have almost nothing to work with. The only thing left is to try to record directly from the brain itself.

It’s important to clarify that brain-computer interfaces are not necessarily stimulating the brain to inject the signal. They’re just recording the endogenous activity that the brain makes. In comparison, a deep brain stimulator is usually not recording anything; it’s just delivering energy to the brain and hoping for the best.

But what we’re doing is asking, if the person is trying to move the paralyzed limb but can’t, can we get to the source of the signal and then do something with it?
 

What’s the process for measuring that in, for example, someone who has a localized lesion in the motor cortex?

The first step is a scan. People have been doing functional MRI on patients who have had a stroke as long as we’ve had fMRI. We know that people can actually activate on MRI areas of their brain around the stroke, but obviously not in the stroke because it’s been lesioned. However, we do know that the circuit adjacent to it and other regions do appear able to be modulated.

So by having a person either imagine trying to do what they want to do or doing what they can do, if they have some tiny residual movement, you can then identify a kind of hot spot on the fMRI where the brain gobbles up all the oxygen because it’s so active. Then that gives you an anatomical target for the surgeon to place the electrode arrays.
 

The Cortimo trial’s enticing findings

What are the most striking results that you’ve seen so far with the device?

The first thing is that we were able to get such recordings at all. We knew from fMRIs that there were fluctuations in oxygen changing when the person was trying to do something they couldn’t do. But nobody knew that you would see this whole population of individual neurons chattering away when you place these electrode arrays in the motor cortex right next to the stroke, and make sense of what we’re recording.

Obviously, that’s very encouraging and gives us hope that many months or years after a stroke, people’s brains are able to maintain this representation of all these different movements and plans. It’s almost like it’s trapped on the other side of the stroke and some of the signals can’t get out.

The other discovery we’re pleased with is that we can actually decode signals in real time and the person can use it to do something, such as trigger the brain to open and close the hand. That’s very different from all the prior research with brain array interfaces.

Furthermore, the gentleman who participated actually had strokes in other parts of his brain affecting his vision; he had homonymous hemianopia. That raised the question of what happens if you affect parts of the brain that have to do with attention and visual processing. Could a system like this work? And again, the answer appears to be yes.
 

What are the next steps for this technology before it can potentially become available in the clinic?

For this to work, the system clearly has to be fully implantable. What we used was percutaneous. The risk-benefit may be acceptable for someone who has quadriplegia because of, for example, spinal cord injury or end-stage ALS who may already have a tracheostomy and a percutaneous endoscopic gastrostomy. But for someone who is hemiparetic and ambulatory, that may not be acceptable. And a fully implantable system would also have much better patient compliance.

Also, when you’re recording from lots and lots of individual brain cells at many, many samples a second on many, many channels, it’s certainly an engineering challenge. It’s not just a single channel that you occasionally query; it’s hundreds of thousands of channels of this complicated data stream.

But these are solvable challenges. People have been making a lot of progress. It’s really a matter of funding and the engineering expertise, rather than some sort of fundamental scientific breakthrough.

With that said, I think it could be within the next 5-10 years that we could actually have a product that expands the toolbox of what can be done for patients who’ve had a stroke, if they’re motivated and there’s no real contraindication.
 

Creating a novel device

On that point, are you partnering with engineering and technology companies?

The hope is that we and other groups working on this can do for the interface sort of what Celera Genomics did for the Human Genome Project. By having enough interest and investment, you may be able to propel the field forward to widespread use rather than just a purely academic, lab-science type of project.

We are in discussion with different companies to see how we can move ahead with this, and we would be pleased to work with whomever is interested. It may be that different companies have different pieces of the puzzle – a better sensor or a better wireless transmitter.

The plan is to move as quickly as we can to a fully implantable system. And then the benchmark for any kind of clinical advancement is to do a prospective trial. With devices, if you can get a big enough effect size, then you sometimes don’t need quite as many patients to prove it. If paralysis is striking enough and you can reverse that, then you can convince the Food and Drug Administration of its safety and efficacy, and the various insurance companies, that it’s actually reasonable and necessary.
 

How long will an implantable device last?

That’s a key question and concern. If you have someone like our participant, who’s in his early 40s, will it keep working 10, 20, 30, 40 years? For the rest of his life? Deep brain stimulators and cochlear implants do function for those long durations, but their designs are quite different. There’s a macroelectrode that’s just delivering current, which is very different from listening in on this microscopic scale. There are different technical considerations.

One possible solution is to make the device out of living tissue, which is something I just wrote about with my colleague D. Kacy Cullen. Living electrodes and amplifiers may seem a bit like science fiction, but on the other hand, we have over a century of plastic surgeons, neurosurgeons, and orthopedic surgeons doing all kinds of complicated modifications of the body, moving nerves and vessels around. It makes you realize that, in a sense, they’ve already done living electrodes by doing a nerve transfer. So the question becomes whether we can refine that living electrode technology, which could then open up more possibilities.
 

Are there any final messages you’d like to share with clinician audience of this news organization?

Regardless of our specialty, we’re always telling our patients about the benefits of things like eating healthy, exercise, and sleep. Now we can point to the fact that, 2 years after stroke, all of these brain areas are still active, and devices that can potentially reverse and unparalyze your limbs may be available in the coming 5- or 10-plus years. That gives clinicians more justification to tell their patients to really stay on top of those things so that they can be in as optimal brain-mind health as possible to someday benefit from them.

Patients and their families need to be part of the conversation of where this is all going. That’s one thing that’s totally different for brain devices versus other devices, where a person’s psychological state doesn’t necessarily matter. But with a brain device, your mental state, psychosocial situation, exercise, sleep – the way you think about and approach it – actually changes to the structure of the brain pretty dramatically.

I don’t want to cause unreasonable hope that we’re going to snap our fingers and it’s going to be cured. But I do think it’s fair to raise a possibility as a way to say that keeping oneself really healthy is justified.

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

Restoring movement following a stroke can be challenging, but recent proof-of-concept research may offer an effective way to do just that. Researchers behind the ongoing Cortimo trial successfully performed a procedure on a patient 2 years removed from a stroke, in which microelectrode arrays were implanted into his brain to decode signals driving motor function. These signals then allowed him to operate a powered brace worn on his paralyzed arm.

This news organization spoke with the trial’s principal investigator, Mijail D. Serruya, MD, PhD, an assistant professor of neurology at Thomas Jefferson University Hospital, Philadelphia, about the trial’s initial findings, what this technology may ultimately look like, and the implications for stroke patients in knowing that restorative interventions may be on the horizon.
 

How did you first get involved with implanting electrodes to help stroke patients with recovery?

I was involved in the first human application of a microelectrode array in a young man who had quadriplegia because of a spinal cord injury. We showed that we could record signal directly from his motor cortex and use it to move a cursor on the screen, and open and close a prosthetic hand and arm.

I was naive and thought that this would soon be a widely available clinical medical device. Now it’s nearly 15 years later, and while it certainly has been safely used in multiple labs to record signals from people with spinal cord injury, amyotrophic lateral sclerosis (ALS), or locked-in syndrome from a brain stem stroke, it still requires a team of technicians and a percutaneous connector. It really has not gotten out of the university.

A few years ago I spoke with Robert Rosenwasser, MD, chairman of the department of neurosurgery at Thomas Jefferson, who runs a very busy stroke center and performed the surgery in this trial. We put our heads together and said: “Maybe the time is now to see whether we can move this technology to this much more prevalent condition of a hemispheric stroke.” And that’s what we did.
 

How did the idea of using computer brain electrode interfaces begin?

Around 20 years ago, if you had someone who had severe paralysis and you wanted to restore movement, the question was, where can you get a good control signal from? Obviously, if someone can talk, they can use a voice-actuated system with speech recognition and maybe you can track their eye gaze. But if they’re trying to move their limbs, you want a motor control signal.

In someone who has end-stage ALS or a brain stem stroke, you can’t even record residual muscle activity; you have almost nothing to work with. The only thing left is to try to record directly from the brain itself.

It’s important to clarify that brain-computer interfaces are not necessarily stimulating the brain to inject the signal. They’re just recording the endogenous activity that the brain makes. In comparison, a deep brain stimulator is usually not recording anything; it’s just delivering energy to the brain and hoping for the best.

But what we’re doing is asking, if the person is trying to move the paralyzed limb but can’t, can we get to the source of the signal and then do something with it?
 

What’s the process for measuring that in, for example, someone who has a localized lesion in the motor cortex?

The first step is a scan. People have been doing functional MRI on patients who have had a stroke as long as we’ve had fMRI. We know that people can actually activate on MRI areas of their brain around the stroke, but obviously not in the stroke because it’s been lesioned. However, we do know that the circuit adjacent to it and other regions do appear able to be modulated.

So by having a person either imagine trying to do what they want to do or doing what they can do, if they have some tiny residual movement, you can then identify a kind of hot spot on the fMRI where the brain gobbles up all the oxygen because it’s so active. Then that gives you an anatomical target for the surgeon to place the electrode arrays.
 

The Cortimo trial’s enticing findings

What are the most striking results that you’ve seen so far with the device?

The first thing is that we were able to get such recordings at all. We knew from fMRIs that there were fluctuations in oxygen changing when the person was trying to do something they couldn’t do. But nobody knew that you would see this whole population of individual neurons chattering away when you place these electrode arrays in the motor cortex right next to the stroke, and make sense of what we’re recording.

Obviously, that’s very encouraging and gives us hope that many months or years after a stroke, people’s brains are able to maintain this representation of all these different movements and plans. It’s almost like it’s trapped on the other side of the stroke and some of the signals can’t get out.

The other discovery we’re pleased with is that we can actually decode signals in real time and the person can use it to do something, such as trigger the brain to open and close the hand. That’s very different from all the prior research with brain array interfaces.

Furthermore, the gentleman who participated actually had strokes in other parts of his brain affecting his vision; he had homonymous hemianopia. That raised the question of what happens if you affect parts of the brain that have to do with attention and visual processing. Could a system like this work? And again, the answer appears to be yes.
 

What are the next steps for this technology before it can potentially become available in the clinic?

For this to work, the system clearly has to be fully implantable. What we used was percutaneous. The risk-benefit may be acceptable for someone who has quadriplegia because of, for example, spinal cord injury or end-stage ALS who may already have a tracheostomy and a percutaneous endoscopic gastrostomy. But for someone who is hemiparetic and ambulatory, that may not be acceptable. And a fully implantable system would also have much better patient compliance.

Also, when you’re recording from lots and lots of individual brain cells at many, many samples a second on many, many channels, it’s certainly an engineering challenge. It’s not just a single channel that you occasionally query; it’s hundreds of thousands of channels of this complicated data stream.

But these are solvable challenges. People have been making a lot of progress. It’s really a matter of funding and the engineering expertise, rather than some sort of fundamental scientific breakthrough.

With that said, I think it could be within the next 5-10 years that we could actually have a product that expands the toolbox of what can be done for patients who’ve had a stroke, if they’re motivated and there’s no real contraindication.
 

Creating a novel device

On that point, are you partnering with engineering and technology companies?

The hope is that we and other groups working on this can do for the interface sort of what Celera Genomics did for the Human Genome Project. By having enough interest and investment, you may be able to propel the field forward to widespread use rather than just a purely academic, lab-science type of project.

We are in discussion with different companies to see how we can move ahead with this, and we would be pleased to work with whomever is interested. It may be that different companies have different pieces of the puzzle – a better sensor or a better wireless transmitter.

The plan is to move as quickly as we can to a fully implantable system. And then the benchmark for any kind of clinical advancement is to do a prospective trial. With devices, if you can get a big enough effect size, then you sometimes don’t need quite as many patients to prove it. If paralysis is striking enough and you can reverse that, then you can convince the Food and Drug Administration of its safety and efficacy, and the various insurance companies, that it’s actually reasonable and necessary.
 

How long will an implantable device last?

That’s a key question and concern. If you have someone like our participant, who’s in his early 40s, will it keep working 10, 20, 30, 40 years? For the rest of his life? Deep brain stimulators and cochlear implants do function for those long durations, but their designs are quite different. There’s a macroelectrode that’s just delivering current, which is very different from listening in on this microscopic scale. There are different technical considerations.

One possible solution is to make the device out of living tissue, which is something I just wrote about with my colleague D. Kacy Cullen. Living electrodes and amplifiers may seem a bit like science fiction, but on the other hand, we have over a century of plastic surgeons, neurosurgeons, and orthopedic surgeons doing all kinds of complicated modifications of the body, moving nerves and vessels around. It makes you realize that, in a sense, they’ve already done living electrodes by doing a nerve transfer. So the question becomes whether we can refine that living electrode technology, which could then open up more possibilities.
 

Are there any final messages you’d like to share with clinician audience of this news organization?

Regardless of our specialty, we’re always telling our patients about the benefits of things like eating healthy, exercise, and sleep. Now we can point to the fact that, 2 years after stroke, all of these brain areas are still active, and devices that can potentially reverse and unparalyze your limbs may be available in the coming 5- or 10-plus years. That gives clinicians more justification to tell their patients to really stay on top of those things so that they can be in as optimal brain-mind health as possible to someday benefit from them.

Patients and their families need to be part of the conversation of where this is all going. That’s one thing that’s totally different for brain devices versus other devices, where a person’s psychological state doesn’t necessarily matter. But with a brain device, your mental state, psychosocial situation, exercise, sleep – the way you think about and approach it – actually changes to the structure of the brain pretty dramatically.

I don’t want to cause unreasonable hope that we’re going to snap our fingers and it’s going to be cured. But I do think it’s fair to raise a possibility as a way to say that keeping oneself really healthy is justified.

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

Restoring movement following a stroke can be challenging, but recent proof-of-concept research may offer an effective way to do just that. Researchers behind the ongoing Cortimo trial successfully performed a procedure on a patient 2 years removed from a stroke, in which microelectrode arrays were implanted into his brain to decode signals driving motor function. These signals then allowed him to operate a powered brace worn on his paralyzed arm.

This news organization spoke with the trial’s principal investigator, Mijail D. Serruya, MD, PhD, an assistant professor of neurology at Thomas Jefferson University Hospital, Philadelphia, about the trial’s initial findings, what this technology may ultimately look like, and the implications for stroke patients in knowing that restorative interventions may be on the horizon.
 

How did you first get involved with implanting electrodes to help stroke patients with recovery?

I was involved in the first human application of a microelectrode array in a young man who had quadriplegia because of a spinal cord injury. We showed that we could record signal directly from his motor cortex and use it to move a cursor on the screen, and open and close a prosthetic hand and arm.

I was naive and thought that this would soon be a widely available clinical medical device. Now it’s nearly 15 years later, and while it certainly has been safely used in multiple labs to record signals from people with spinal cord injury, amyotrophic lateral sclerosis (ALS), or locked-in syndrome from a brain stem stroke, it still requires a team of technicians and a percutaneous connector. It really has not gotten out of the university.

A few years ago I spoke with Robert Rosenwasser, MD, chairman of the department of neurosurgery at Thomas Jefferson, who runs a very busy stroke center and performed the surgery in this trial. We put our heads together and said: “Maybe the time is now to see whether we can move this technology to this much more prevalent condition of a hemispheric stroke.” And that’s what we did.
 

How did the idea of using computer brain electrode interfaces begin?

Around 20 years ago, if you had someone who had severe paralysis and you wanted to restore movement, the question was, where can you get a good control signal from? Obviously, if someone can talk, they can use a voice-actuated system with speech recognition and maybe you can track their eye gaze. But if they’re trying to move their limbs, you want a motor control signal.

In someone who has end-stage ALS or a brain stem stroke, you can’t even record residual muscle activity; you have almost nothing to work with. The only thing left is to try to record directly from the brain itself.

It’s important to clarify that brain-computer interfaces are not necessarily stimulating the brain to inject the signal. They’re just recording the endogenous activity that the brain makes. In comparison, a deep brain stimulator is usually not recording anything; it’s just delivering energy to the brain and hoping for the best.

But what we’re doing is asking, if the person is trying to move the paralyzed limb but can’t, can we get to the source of the signal and then do something with it?
 

What’s the process for measuring that in, for example, someone who has a localized lesion in the motor cortex?

The first step is a scan. People have been doing functional MRI on patients who have had a stroke as long as we’ve had fMRI. We know that people can actually activate on MRI areas of their brain around the stroke, but obviously not in the stroke because it’s been lesioned. However, we do know that the circuit adjacent to it and other regions do appear able to be modulated.

So by having a person either imagine trying to do what they want to do or doing what they can do, if they have some tiny residual movement, you can then identify a kind of hot spot on the fMRI where the brain gobbles up all the oxygen because it’s so active. Then that gives you an anatomical target for the surgeon to place the electrode arrays.
 

The Cortimo trial’s enticing findings

What are the most striking results that you’ve seen so far with the device?

The first thing is that we were able to get such recordings at all. We knew from fMRIs that there were fluctuations in oxygen changing when the person was trying to do something they couldn’t do. But nobody knew that you would see this whole population of individual neurons chattering away when you place these electrode arrays in the motor cortex right next to the stroke, and make sense of what we’re recording.

Obviously, that’s very encouraging and gives us hope that many months or years after a stroke, people’s brains are able to maintain this representation of all these different movements and plans. It’s almost like it’s trapped on the other side of the stroke and some of the signals can’t get out.

The other discovery we’re pleased with is that we can actually decode signals in real time and the person can use it to do something, such as trigger the brain to open and close the hand. That’s very different from all the prior research with brain array interfaces.

Furthermore, the gentleman who participated actually had strokes in other parts of his brain affecting his vision; he had homonymous hemianopia. That raised the question of what happens if you affect parts of the brain that have to do with attention and visual processing. Could a system like this work? And again, the answer appears to be yes.
 

What are the next steps for this technology before it can potentially become available in the clinic?

For this to work, the system clearly has to be fully implantable. What we used was percutaneous. The risk-benefit may be acceptable for someone who has quadriplegia because of, for example, spinal cord injury or end-stage ALS who may already have a tracheostomy and a percutaneous endoscopic gastrostomy. But for someone who is hemiparetic and ambulatory, that may not be acceptable. And a fully implantable system would also have much better patient compliance.

Also, when you’re recording from lots and lots of individual brain cells at many, many samples a second on many, many channels, it’s certainly an engineering challenge. It’s not just a single channel that you occasionally query; it’s hundreds of thousands of channels of this complicated data stream.

But these are solvable challenges. People have been making a lot of progress. It’s really a matter of funding and the engineering expertise, rather than some sort of fundamental scientific breakthrough.

With that said, I think it could be within the next 5-10 years that we could actually have a product that expands the toolbox of what can be done for patients who’ve had a stroke, if they’re motivated and there’s no real contraindication.
 

Creating a novel device

On that point, are you partnering with engineering and technology companies?

The hope is that we and other groups working on this can do for the interface sort of what Celera Genomics did for the Human Genome Project. By having enough interest and investment, you may be able to propel the field forward to widespread use rather than just a purely academic, lab-science type of project.

We are in discussion with different companies to see how we can move ahead with this, and we would be pleased to work with whomever is interested. It may be that different companies have different pieces of the puzzle – a better sensor or a better wireless transmitter.

The plan is to move as quickly as we can to a fully implantable system. And then the benchmark for any kind of clinical advancement is to do a prospective trial. With devices, if you can get a big enough effect size, then you sometimes don’t need quite as many patients to prove it. If paralysis is striking enough and you can reverse that, then you can convince the Food and Drug Administration of its safety and efficacy, and the various insurance companies, that it’s actually reasonable and necessary.
 

How long will an implantable device last?

That’s a key question and concern. If you have someone like our participant, who’s in his early 40s, will it keep working 10, 20, 30, 40 years? For the rest of his life? Deep brain stimulators and cochlear implants do function for those long durations, but their designs are quite different. There’s a macroelectrode that’s just delivering current, which is very different from listening in on this microscopic scale. There are different technical considerations.

One possible solution is to make the device out of living tissue, which is something I just wrote about with my colleague D. Kacy Cullen. Living electrodes and amplifiers may seem a bit like science fiction, but on the other hand, we have over a century of plastic surgeons, neurosurgeons, and orthopedic surgeons doing all kinds of complicated modifications of the body, moving nerves and vessels around. It makes you realize that, in a sense, they’ve already done living electrodes by doing a nerve transfer. So the question becomes whether we can refine that living electrode technology, which could then open up more possibilities.
 

Are there any final messages you’d like to share with clinician audience of this news organization?

Regardless of our specialty, we’re always telling our patients about the benefits of things like eating healthy, exercise, and sleep. Now we can point to the fact that, 2 years after stroke, all of these brain areas are still active, and devices that can potentially reverse and unparalyze your limbs may be available in the coming 5- or 10-plus years. That gives clinicians more justification to tell their patients to really stay on top of those things so that they can be in as optimal brain-mind health as possible to someday benefit from them.

Patients and their families need to be part of the conversation of where this is all going. That’s one thing that’s totally different for brain devices versus other devices, where a person’s psychological state doesn’t necessarily matter. But with a brain device, your mental state, psychosocial situation, exercise, sleep – the way you think about and approach it – actually changes to the structure of the brain pretty dramatically.

I don’t want to cause unreasonable hope that we’re going to snap our fingers and it’s going to be cured. But I do think it’s fair to raise a possibility as a way to say that keeping oneself really healthy is justified.

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

The Food and Drug Administration has approved the antisense oligonucleotide casimersen (Amondys 45, Sarepta Therapeutics) injection for the treatment of patients with Duchenne muscular dystrophy (DMD) plus a rare DMD mutation, the agency has announced. 

This particular mutation of the DMD gene “is amenable to exon 45 skipping,” the FDA noted in a press release. The agency added that this is its first approval of a targeted treatment for patients with the mutation.

“Developing drugs designed for patients with specific mutations is a critical part of personalized medicine,” Eric Bastings, MD, deputy director of the Office of Neuroscience at the FDA’s Center for Drug Evaluation and Research, said in a statement.

The approval was based on results from a 43-person randomized controlled trial. Patients who received casimersen had a greater increase in production of the muscle-fiber protein dystrophin compared with their counterparts who received placebo.
 

Approved – with cautions

The FDA noted that DMD prevalence worldwide is about 1 in 3,600 boys – although it can also affect girls in rare cases. Symptoms of the disorder are commonly first observed around age 3 years but worsen steadily over time. DMD gene mutations lead to a decrease in dystrophin.

As reported by Medscape Medical News in August, the FDA approved viltolarsen (Viltepso, NS Pharma) for the treatment of DMD in patients with a confirmed mutation amenable to exon 53 skipping, following approval of golodirsen injection (Vyondys 53, Sarepta Therapeutics) for the same indication in December 2019.  

The DMD gene mutation that is amenable to exon 45 skipping is present in about 8% of patients with DMD.

The trial that carried weight with the FDA included 43 male participants with DMD aged 7-20 years. All were confirmed to have the exon 45-skipping gene mutation and all were randomly assigned 2:1 to received IV casimersen 30 mg/kg or matching placebo.

Results showed that, between baseline and 48 weeks post treatment, the casimersen group showed a significantly higher increase in levels of dystrophin protein than in the placebo group.

Upper respiratory tract infections, fever, joint and throat pain, headache, and cough were the most common adverse events experienced by the active-treatment group.

Although the clinical studies assessing casimersen did not show any reports of kidney toxicity, the adverse event was observed in some nonclinical studies. Therefore, clinicians should monitor kidney function in any patient receiving this treatment, the FDA recommended.

Overall, “the FDA has concluded that the data submitted by the applicant demonstrated an increase in dystrophin production that is reasonably likely to predict clinical benefit” in this patient population, the agency said in its press release.

However, it noted that definitive clinical benefits such as improved motor function were not “established.”

“In making this decision, the FDA considered the potential risks associated with the drug, the life-threatening and debilitating nature of the disease, and the lack of [other] available therapy,” the agency said.

It added that the manufacturer is currently conducting a multicenter study focused on the safety and efficacy of the drug in ambulatory patients with DMD.

The FDA approved casimersen using its Accelerated Approval pathway, granted Fast Track and Priority Review designations to its applications, and gave the treatment Orphan Drug designation.

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

The Food and Drug Administration has approved the antisense oligonucleotide casimersen (Amondys 45, Sarepta Therapeutics) injection for the treatment of patients with Duchenne muscular dystrophy (DMD) plus a rare DMD mutation, the agency has announced. 

This particular mutation of the DMD gene “is amenable to exon 45 skipping,” the FDA noted in a press release. The agency added that this is its first approval of a targeted treatment for patients with the mutation.

“Developing drugs designed for patients with specific mutations is a critical part of personalized medicine,” Eric Bastings, MD, deputy director of the Office of Neuroscience at the FDA’s Center for Drug Evaluation and Research, said in a statement.

The approval was based on results from a 43-person randomized controlled trial. Patients who received casimersen had a greater increase in production of the muscle-fiber protein dystrophin compared with their counterparts who received placebo.
 

Approved – with cautions

The FDA noted that DMD prevalence worldwide is about 1 in 3,600 boys – although it can also affect girls in rare cases. Symptoms of the disorder are commonly first observed around age 3 years but worsen steadily over time. DMD gene mutations lead to a decrease in dystrophin.

As reported by Medscape Medical News in August, the FDA approved viltolarsen (Viltepso, NS Pharma) for the treatment of DMD in patients with a confirmed mutation amenable to exon 53 skipping, following approval of golodirsen injection (Vyondys 53, Sarepta Therapeutics) for the same indication in December 2019.  

The DMD gene mutation that is amenable to exon 45 skipping is present in about 8% of patients with DMD.

The trial that carried weight with the FDA included 43 male participants with DMD aged 7-20 years. All were confirmed to have the exon 45-skipping gene mutation and all were randomly assigned 2:1 to received IV casimersen 30 mg/kg or matching placebo.

Results showed that, between baseline and 48 weeks post treatment, the casimersen group showed a significantly higher increase in levels of dystrophin protein than in the placebo group.

Upper respiratory tract infections, fever, joint and throat pain, headache, and cough were the most common adverse events experienced by the active-treatment group.

Although the clinical studies assessing casimersen did not show any reports of kidney toxicity, the adverse event was observed in some nonclinical studies. Therefore, clinicians should monitor kidney function in any patient receiving this treatment, the FDA recommended.

Overall, “the FDA has concluded that the data submitted by the applicant demonstrated an increase in dystrophin production that is reasonably likely to predict clinical benefit” in this patient population, the agency said in its press release.

However, it noted that definitive clinical benefits such as improved motor function were not “established.”

“In making this decision, the FDA considered the potential risks associated with the drug, the life-threatening and debilitating nature of the disease, and the lack of [other] available therapy,” the agency said.

It added that the manufacturer is currently conducting a multicenter study focused on the safety and efficacy of the drug in ambulatory patients with DMD.

The FDA approved casimersen using its Accelerated Approval pathway, granted Fast Track and Priority Review designations to its applications, and gave the treatment Orphan Drug designation.

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

The Food and Drug Administration has approved the antisense oligonucleotide casimersen (Amondys 45, Sarepta Therapeutics) injection for the treatment of patients with Duchenne muscular dystrophy (DMD) plus a rare DMD mutation, the agency has announced. 

This particular mutation of the DMD gene “is amenable to exon 45 skipping,” the FDA noted in a press release. The agency added that this is its first approval of a targeted treatment for patients with the mutation.

“Developing drugs designed for patients with specific mutations is a critical part of personalized medicine,” Eric Bastings, MD, deputy director of the Office of Neuroscience at the FDA’s Center for Drug Evaluation and Research, said in a statement.

The approval was based on results from a 43-person randomized controlled trial. Patients who received casimersen had a greater increase in production of the muscle-fiber protein dystrophin compared with their counterparts who received placebo.
 

Approved – with cautions

The FDA noted that DMD prevalence worldwide is about 1 in 3,600 boys – although it can also affect girls in rare cases. Symptoms of the disorder are commonly first observed around age 3 years but worsen steadily over time. DMD gene mutations lead to a decrease in dystrophin.

As reported by Medscape Medical News in August, the FDA approved viltolarsen (Viltepso, NS Pharma) for the treatment of DMD in patients with a confirmed mutation amenable to exon 53 skipping, following approval of golodirsen injection (Vyondys 53, Sarepta Therapeutics) for the same indication in December 2019.  

The DMD gene mutation that is amenable to exon 45 skipping is present in about 8% of patients with DMD.

The trial that carried weight with the FDA included 43 male participants with DMD aged 7-20 years. All were confirmed to have the exon 45-skipping gene mutation and all were randomly assigned 2:1 to received IV casimersen 30 mg/kg or matching placebo.

Results showed that, between baseline and 48 weeks post treatment, the casimersen group showed a significantly higher increase in levels of dystrophin protein than in the placebo group.

Upper respiratory tract infections, fever, joint and throat pain, headache, and cough were the most common adverse events experienced by the active-treatment group.

Although the clinical studies assessing casimersen did not show any reports of kidney toxicity, the adverse event was observed in some nonclinical studies. Therefore, clinicians should monitor kidney function in any patient receiving this treatment, the FDA recommended.

Overall, “the FDA has concluded that the data submitted by the applicant demonstrated an increase in dystrophin production that is reasonably likely to predict clinical benefit” in this patient population, the agency said in its press release.

However, it noted that definitive clinical benefits such as improved motor function were not “established.”

“In making this decision, the FDA considered the potential risks associated with the drug, the life-threatening and debilitating nature of the disease, and the lack of [other] available therapy,” the agency said.

It added that the manufacturer is currently conducting a multicenter study focused on the safety and efficacy of the drug in ambulatory patients with DMD.

The FDA approved casimersen using its Accelerated Approval pathway, granted Fast Track and Priority Review designations to its applications, and gave the treatment Orphan Drug designation.

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

The prevalence of asymptomatic central sleep apnea after acute coronary syndrome is high and may be associated with the use of ticagrelor, a new study finds.
Prior studies have suggested that ticagrelor is associated with an increased likelihood of central sleep apnea. The drug’s label notes that two respiratory conditions – central sleep apnea and Cheyne-Stokes respiration – are adverse reactions that were identified after the drug’s approval in the United States in 2011. “Because these reactions are reported voluntarily from a population of an unknown size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure,” the label says. 
Among 80 patients receiving ticagrelor, 24 had central sleep apnea hypopnea syndrome (CSAHS), whereas of 41 patients not taking ticagrelor, 3 had this condition (30% vs. 7.3%, P = .004), in the new study published online Jan. 20, 2021, in Sleep Medicine. A multivariable analysis included in the paper found that age and ticagrelor administration were the only two factors associated with the occurrence of CSAHS.

Findings are ‘striking’

The different rates of central sleep apnea in the study are striking, but it is not clear that asymptomatic central sleep apnea in patients taking ticagrelor is a concern, Ofer Jacobowitz, MD, PhD, associate professor of otolaryngology at Hofstra University, Hempstead, N.Y, said in an interview.

Study author continues to prescribe ticagrelor

One of the study authors, Philippe Meurin, MD, said that he continues to prescribe ticagrelor every day and that the side effect is not necessarily important. 
It is possible that central sleep apnea may resolve, although further studies would need to examine central sleep apnea over time to establish the duration of the condition, he added. Nevertheless, awareness of the association could have implications for clinical practice, Dr. Meurin said.
Central sleep apnea is rare, and if doctors detect it during a sleep study, they may perform extensive tests to assess for possible neurologic diseases, for example, when the cause may be attributed to the medication, he said. In addition, if a patient who is taking ticagrelor has dyspnea, the presence of central sleep apnea may suggest that dyspnea could be related to the drug, although this possibility needs further study, he noted.

Study included patients with ACS history, but no heart failure

Dr. Meurin, of Centre de Réadaptation Cardiaque de La Brie, Les Grands Prés, Villeneuve-Saint-Denis, France, and colleagues included in their study patients between 1 week and 1 year after acute coronary syndrome who did not have heart failure or a history of sleep apnea.
After an overnight sleep study, they classified patients as normal, as having CSAHS (i.e., an apnea-hypopnea index of 15 or greater, mostly with central sleep apneas), or as having obstructive sleep apnea hypopnea syndrome (OSAHS; i.e., an apnea-hypopnea index of 15 or greater, mostly with obstructive sleep apneas).
The prospective study included 121 consecutive patients between January 2018 and March 2020. Patients had a mean age of 56.8, and 88% were men.

Switching to another P2Y12 inhibitor ‘does not seem appropriate’

“CSAHS could be promoted by the use of ticagrelor, a relatively new drug that modifies the apneic threshold,” the study authors wrote. “Regarding underlying mechanisms, the most probable explanation seems to be increased chemosensitivity to hypercapnia by a direct P2Y12 inhibitory effect on the central nervous system.”
Doctors should not overestimate the severity of the adverse reaction or consider it the same way they do OSASH, they added. 
Among patients with acute coronary syndrome in the PLATO study, ticagrelor, compared with clopidogrel, “significantly reduced the rate of death from vascular causes, myocardial infarction, or stroke,” Dr. Meurin and colleagues said. “Because in this study more than 9,000 patients received ticagrelor for 12 months, CSAHS (even if it seems frequent in our study) did not seem to impair the good efficacy/tolerance balance of the drug. Therefore, in asymptomatic CSAHS patients, switching from ticagrelor to another P2Y12 inhibitor does not seem appropriate.”
A recent analysis of data from randomized, controlled trials with ticagrelor did not find excess cases of sleep apnea with the drug. But an asymptomatic adverse event such as central sleep apnea “cannot emerge from a post hoc analysis,” Dr. Meurin and colleagues said.
The analysis of randomized trial data was conducted by Marc S. Sabatine, MD, MPH, chairman of the Thrombolysis in Myocardial Infarction (TIMI) Study Group at Brigham and Women’s Hospital, and coauthors. It was published in JACC: Cardiovascular Interventions in April 2020.
They “used the gold standard for medical evidence (randomized, placebo-controlled trials) and found 158 cases of sleep apnea reported, with absolutely no difference between ticagrelor and placebo,” Dr. Sabatine said in an interview. Their analysis examined clinically overt apnea, he noted.
“It is quite clear that when looking at large numbers in placebo-controlled trials, there is no excess,” Dr. Sabatine said. “Meurin et al. are examining a different outcome: the results of a lab test in what may be entirely asymptomatic patients.”
A randomized trial could confirm the association, he said.
“The association may be real, but also may be play of chance or confounded,” said Dr. Sabatine. “To convince the medical community, the next step would be for the investigators to do a randomized trial and test whether ticagrelor increases the risk of central sleep apnea.”
Dr. Meurin and the study coauthors had no disclosures. The analysis of randomized, controlled trial data by Dr. Sabatine and colleagues was funded by AstraZeneca, which distributes ticagrelor under the trade name Brilinta. Dr. Sabatine has been a consultant for AstraZeneca and received research grants through Brigham and Women’s Hospital from AstraZeneca. He has consulted for and received grants through the hospital from other companies as well. Dr. Jacobowitz had no relevant disclosures.
[email protected] 

The prevalence of asymptomatic central sleep apnea after acute coronary syndrome is high and may be associated with the use of ticagrelor, a new study finds.
Prior studies have suggested that ticagrelor is associated with an increased likelihood of central sleep apnea. The drug’s label notes that two respiratory conditions – central sleep apnea and Cheyne-Stokes respiration – are adverse reactions that were identified after the drug’s approval in the United States in 2011. “Because these reactions are reported voluntarily from a population of an unknown size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure,” the label says. 
Among 80 patients receiving ticagrelor, 24 had central sleep apnea hypopnea syndrome (CSAHS), whereas of 41 patients not taking ticagrelor, 3 had this condition (30% vs. 7.3%, P = .004), in the new study published online Jan. 20, 2021, in Sleep Medicine. A multivariable analysis included in the paper found that age and ticagrelor administration were the only two factors associated with the occurrence of CSAHS.

Findings are ‘striking’

The different rates of central sleep apnea in the study are striking, but it is not clear that asymptomatic central sleep apnea in patients taking ticagrelor is a concern, Ofer Jacobowitz, MD, PhD, associate professor of otolaryngology at Hofstra University, Hempstead, N.Y, said in an interview.

Study author continues to prescribe ticagrelor

One of the study authors, Philippe Meurin, MD, said that he continues to prescribe ticagrelor every day and that the side effect is not necessarily important. 
It is possible that central sleep apnea may resolve, although further studies would need to examine central sleep apnea over time to establish the duration of the condition, he added. Nevertheless, awareness of the association could have implications for clinical practice, Dr. Meurin said.
Central sleep apnea is rare, and if doctors detect it during a sleep study, they may perform extensive tests to assess for possible neurologic diseases, for example, when the cause may be attributed to the medication, he said. In addition, if a patient who is taking ticagrelor has dyspnea, the presence of central sleep apnea may suggest that dyspnea could be related to the drug, although this possibility needs further study, he noted.

Study included patients with ACS history, but no heart failure

Dr. Meurin, of Centre de Réadaptation Cardiaque de La Brie, Les Grands Prés, Villeneuve-Saint-Denis, France, and colleagues included in their study patients between 1 week and 1 year after acute coronary syndrome who did not have heart failure or a history of sleep apnea.
After an overnight sleep study, they classified patients as normal, as having CSAHS (i.e., an apnea-hypopnea index of 15 or greater, mostly with central sleep apneas), or as having obstructive sleep apnea hypopnea syndrome (OSAHS; i.e., an apnea-hypopnea index of 15 or greater, mostly with obstructive sleep apneas).
The prospective study included 121 consecutive patients between January 2018 and March 2020. Patients had a mean age of 56.8, and 88% were men.

Switching to another P2Y12 inhibitor ‘does not seem appropriate’

“CSAHS could be promoted by the use of ticagrelor, a relatively new drug that modifies the apneic threshold,” the study authors wrote. “Regarding underlying mechanisms, the most probable explanation seems to be increased chemosensitivity to hypercapnia by a direct P2Y12 inhibitory effect on the central nervous system.”
Doctors should not overestimate the severity of the adverse reaction or consider it the same way they do OSASH, they added. 
Among patients with acute coronary syndrome in the PLATO study, ticagrelor, compared with clopidogrel, “significantly reduced the rate of death from vascular causes, myocardial infarction, or stroke,” Dr. Meurin and colleagues said. “Because in this study more than 9,000 patients received ticagrelor for 12 months, CSAHS (even if it seems frequent in our study) did not seem to impair the good efficacy/tolerance balance of the drug. Therefore, in asymptomatic CSAHS patients, switching from ticagrelor to another P2Y12 inhibitor does not seem appropriate.”
A recent analysis of data from randomized, controlled trials with ticagrelor did not find excess cases of sleep apnea with the drug. But an asymptomatic adverse event such as central sleep apnea “cannot emerge from a post hoc analysis,” Dr. Meurin and colleagues said.
The analysis of randomized trial data was conducted by Marc S. Sabatine, MD, MPH, chairman of the Thrombolysis in Myocardial Infarction (TIMI) Study Group at Brigham and Women’s Hospital, and coauthors. It was published in JACC: Cardiovascular Interventions in April 2020.
They “used the gold standard for medical evidence (randomized, placebo-controlled trials) and found 158 cases of sleep apnea reported, with absolutely no difference between ticagrelor and placebo,” Dr. Sabatine said in an interview. Their analysis examined clinically overt apnea, he noted.
“It is quite clear that when looking at large numbers in placebo-controlled trials, there is no excess,” Dr. Sabatine said. “Meurin et al. are examining a different outcome: the results of a lab test in what may be entirely asymptomatic patients.”
A randomized trial could confirm the association, he said.
“The association may be real, but also may be play of chance or confounded,” said Dr. Sabatine. “To convince the medical community, the next step would be for the investigators to do a randomized trial and test whether ticagrelor increases the risk of central sleep apnea.”
Dr. Meurin and the study coauthors had no disclosures. The analysis of randomized, controlled trial data by Dr. Sabatine and colleagues was funded by AstraZeneca, which distributes ticagrelor under the trade name Brilinta. Dr. Sabatine has been a consultant for AstraZeneca and received research grants through Brigham and Women’s Hospital from AstraZeneca. He has consulted for and received grants through the hospital from other companies as well. Dr. Jacobowitz had no relevant disclosures.
[email protected] 

The prevalence of asymptomatic central sleep apnea after acute coronary syndrome is high and may be associated with the use of ticagrelor, a new study finds.
Prior studies have suggested that ticagrelor is associated with an increased likelihood of central sleep apnea. The drug’s label notes that two respiratory conditions – central sleep apnea and Cheyne-Stokes respiration – are adverse reactions that were identified after the drug’s approval in the United States in 2011. “Because these reactions are reported voluntarily from a population of an unknown size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure,” the label says. 
Among 80 patients receiving ticagrelor, 24 had central sleep apnea hypopnea syndrome (CSAHS), whereas of 41 patients not taking ticagrelor, 3 had this condition (30% vs. 7.3%, P = .004), in the new study published online Jan. 20, 2021, in Sleep Medicine. A multivariable analysis included in the paper found that age and ticagrelor administration were the only two factors associated with the occurrence of CSAHS.

Findings are ‘striking’

The different rates of central sleep apnea in the study are striking, but it is not clear that asymptomatic central sleep apnea in patients taking ticagrelor is a concern, Ofer Jacobowitz, MD, PhD, associate professor of otolaryngology at Hofstra University, Hempstead, N.Y, said in an interview.

Study author continues to prescribe ticagrelor

One of the study authors, Philippe Meurin, MD, said that he continues to prescribe ticagrelor every day and that the side effect is not necessarily important. 
It is possible that central sleep apnea may resolve, although further studies would need to examine central sleep apnea over time to establish the duration of the condition, he added. Nevertheless, awareness of the association could have implications for clinical practice, Dr. Meurin said.
Central sleep apnea is rare, and if doctors detect it during a sleep study, they may perform extensive tests to assess for possible neurologic diseases, for example, when the cause may be attributed to the medication, he said. In addition, if a patient who is taking ticagrelor has dyspnea, the presence of central sleep apnea may suggest that dyspnea could be related to the drug, although this possibility needs further study, he noted.

Study included patients with ACS history, but no heart failure

Dr. Meurin, of Centre de Réadaptation Cardiaque de La Brie, Les Grands Prés, Villeneuve-Saint-Denis, France, and colleagues included in their study patients between 1 week and 1 year after acute coronary syndrome who did not have heart failure or a history of sleep apnea.
After an overnight sleep study, they classified patients as normal, as having CSAHS (i.e., an apnea-hypopnea index of 15 or greater, mostly with central sleep apneas), or as having obstructive sleep apnea hypopnea syndrome (OSAHS; i.e., an apnea-hypopnea index of 15 or greater, mostly with obstructive sleep apneas).
The prospective study included 121 consecutive patients between January 2018 and March 2020. Patients had a mean age of 56.8, and 88% were men.

Switching to another P2Y12 inhibitor ‘does not seem appropriate’

“CSAHS could be promoted by the use of ticagrelor, a relatively new drug that modifies the apneic threshold,” the study authors wrote. “Regarding underlying mechanisms, the most probable explanation seems to be increased chemosensitivity to hypercapnia by a direct P2Y12 inhibitory effect on the central nervous system.”
Doctors should not overestimate the severity of the adverse reaction or consider it the same way they do OSASH, they added. 
Among patients with acute coronary syndrome in the PLATO study, ticagrelor, compared with clopidogrel, “significantly reduced the rate of death from vascular causes, myocardial infarction, or stroke,” Dr. Meurin and colleagues said. “Because in this study more than 9,000 patients received ticagrelor for 12 months, CSAHS (even if it seems frequent in our study) did not seem to impair the good efficacy/tolerance balance of the drug. Therefore, in asymptomatic CSAHS patients, switching from ticagrelor to another P2Y12 inhibitor does not seem appropriate.”
A recent analysis of data from randomized, controlled trials with ticagrelor did not find excess cases of sleep apnea with the drug. But an asymptomatic adverse event such as central sleep apnea “cannot emerge from a post hoc analysis,” Dr. Meurin and colleagues said.
The analysis of randomized trial data was conducted by Marc S. Sabatine, MD, MPH, chairman of the Thrombolysis in Myocardial Infarction (TIMI) Study Group at Brigham and Women’s Hospital, and coauthors. It was published in JACC: Cardiovascular Interventions in April 2020.
They “used the gold standard for medical evidence (randomized, placebo-controlled trials) and found 158 cases of sleep apnea reported, with absolutely no difference between ticagrelor and placebo,” Dr. Sabatine said in an interview. Their analysis examined clinically overt apnea, he noted.
“It is quite clear that when looking at large numbers in placebo-controlled trials, there is no excess,” Dr. Sabatine said. “Meurin et al. are examining a different outcome: the results of a lab test in what may be entirely asymptomatic patients.”
A randomized trial could confirm the association, he said.
“The association may be real, but also may be play of chance or confounded,” said Dr. Sabatine. “To convince the medical community, the next step would be for the investigators to do a randomized trial and test whether ticagrelor increases the risk of central sleep apnea.”
Dr. Meurin and the study coauthors had no disclosures. The analysis of randomized, controlled trial data by Dr. Sabatine and colleagues was funded by AstraZeneca, which distributes ticagrelor under the trade name Brilinta. Dr. Sabatine has been a consultant for AstraZeneca and received research grants through Brigham and Women’s Hospital from AstraZeneca. He has consulted for and received grants through the hospital from other companies as well. Dr. Jacobowitz had no relevant disclosures.
[email protected] 

Novel research from the Concussion Assessment, Research and Education (CARE) Consortium sheds new light on how to effectively reduce the incidence of concussion and head injury exposure in college football.

The study, led by neurotrauma experts Michael McCrea, PhD, and Brian Stemper, PhD, professors of neurosurgery at the Medical College of Wisconsin in Milwaukee, reports data from hundreds of college football players across five seasons and shows concussion incidence and head injury exposure are disproportionately higher in the preseason versus the regular season.

The research also reveals that such injuries occur more often during practices than games.

“We think that with the findings from this paper, there’s a role for everybody to play in reducing injury,” Dr. McCrea said. “We hope these data help inform broad-based policy about practice and preseason training policies in collegiate football. We also think there’s a role for athletic administrators, coaches, and even athletes themselves.”

The study was published online Feb. 1 in JAMA Neurology.
 

More injuries in preseason

Concussion is one of the most common injuries in football. Beyond these harms are growing concerns that repetitive HIE may increase the risk of long-term neurologic health problems including chronic traumatic encephalopathy (CTE).

The CARE Consortium, which has been conducting research with college athletes across 26 sports and military cadets since 2014, has been interested in multiple facets of concussion and brain trauma.

“We’ve enrolled more than 50,000 athletes and service academy cadets into the consortium over the last 6 years to research all involved aspects including the clinical core, the imaging core, the blood biomarker core, and the genetic core, and we have a head impact measurement core.”

To investigate the pattern of concussion incidence across the football season in college players, the investigators used impact measurement technology across six Division I NCAA football programs participating in the CARE Consortium from 2015 to 2019.

A total of 658 players – all male, mean age 19 years – were fitted with the Head Impact Telemetry System (HITS) sensor arrays in their helmets to measure head impact frequency, location, and magnitude during play.

“This particular study had built-in algorithms that weeded out impacts that were below 10G of linear magnitude, because those have been determined not likely to be real impacts,” Dr. McCrea said.

Across the five seasons studied, 528,684 head impacts recorded met the quality standards for analysis. Players sustained a median of 415 (interquartile range [IQR], 190-727) impacts per season.

Of those, 68 players sustained a diagnosed concussion. In total, 48.5% of concussions occurred during preseason training, despite preseason representing only 20.8% of the football season. Total head injury exposure in the preseason occurred at twice the proportion of the regular season (324.9 vs. 162.4 impacts per team per day; mean difference, 162.6 impacts; 95% confidence interval, 110.9-214.3; P < .001).

“Preseason training often has a much higher intensity to it, in terms of the total hours, the actual training, and the heavy emphasis on full-contact drills like tackling and blocking,” said Dr. McCrea. “Even the volume of players that are participating is greater.”

Results also showed that in each of the five seasons, head injury exposure per athlete was highest in August (preseason) (median, 146.0 impacts; IQR, 63.0-247.8) and lowest in November (median, 80.0 impacts; IQR, 35.0-148.0). In the studied period, 72% of concussions and 66.9% of head injury exposure occurred in practice. Even within the regular season, total head injury exposure in practices was 84.2% higher than in games.

“This incredible dataset we have on head impact measurement also gives us the opportunity to compare it with our other research looking at the correlation between a single head impact and changes in brain structure and function on MRI, on blood biomarkers, giving us the ability to look at the connection between mechanism of effect of injury and recovery from injury,” said Dr. McCrea.

These findings also provide an opportunity to modify approaches to preseason training and football practices to keep players safer, said Dr. McCrea, noting that about half of the variance in head injury exposure is at the level of the individual athlete.

“With this large body of athletes we’ve instrumented, we can look at, for instance, all of the running backs and understand the athlete and what his head injury exposure looks like compared to all other running backs. If we find out that an athlete has a rate of head injury exposure that’s 300% higher than most other players that play the same position, we can take that data directly to the athlete to work on their technique and approach to the game.

“Every researcher wishes that their basic science or their clinical research findings will have some impact on the health and well-being of the population they’re studying. By modifying practices and preseason training, football teams could greatly reduce the risk of injury and exposure for their players, while still maintaining the competitive nature of game play,” he added.  

Through a combination of policy and education, similar strategies could be implemented to help prevent concussion and HIE in high school and youth football too, said Dr. McCrea.

‘Shocking’ findings

In an accompanying editorial, Christopher J. Nowinski, PhD, of the Concussion Legacy Foundation, Boston, and Robert C. Cantu, MD, department of neurosurgery, Emerson Hospital, Concord, Massachusetts, said the findings could have significant policy implications and offer a valuable expansion of prior research.

“From 2005 to 2010, studies on college football revealed that about two-thirds of head impacts occurred in practice,” they noted. “We cited this data in 2010 when we proposed to the NFL Players Association that the most effective way to reduce the risks of negative neurological outcomes was to reduce hitting in practice. They agreed, and in 2011 collectively bargained for severe contact limits in practice, with 14 full-contact practices allowed during the 17-week season. Since that rule was implemented, only 18% of NFL concussions have occurred in practice.”

“Against this backdrop, the results of the study by McCrea et al. are shocking,” they added. “It reveals that college football players still experience 72% of their concussions and 67% of their total head injury exposure in practice.”

Even more shocking, noted Dr. Nowinski and Dr. Cantu, is that these numbers are almost certainly an underestimate of the dangers of practice.

“As a former college football player and a former team physician, respectively, we find this situation inexcusable. Concussions in games are inevitable, but concussions in practice are preventable,” they wrote.  

“Laudably,” they added “the investigators call on the NCAA and football conferences to explore policy and rule changes to reduce concussion incidence and HIE and to create robust educational offerings to encourage change from coaches and college administrators.”

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

Novel research from the Concussion Assessment, Research and Education (CARE) Consortium sheds new light on how to effectively reduce the incidence of concussion and head injury exposure in college football.

The study, led by neurotrauma experts Michael McCrea, PhD, and Brian Stemper, PhD, professors of neurosurgery at the Medical College of Wisconsin in Milwaukee, reports data from hundreds of college football players across five seasons and shows concussion incidence and head injury exposure are disproportionately higher in the preseason versus the regular season.

The research also reveals that such injuries occur more often during practices than games.

“We think that with the findings from this paper, there’s a role for everybody to play in reducing injury,” Dr. McCrea said. “We hope these data help inform broad-based policy about practice and preseason training policies in collegiate football. We also think there’s a role for athletic administrators, coaches, and even athletes themselves.”

The study was published online Feb. 1 in JAMA Neurology.
 

More injuries in preseason

Concussion is one of the most common injuries in football. Beyond these harms are growing concerns that repetitive HIE may increase the risk of long-term neurologic health problems including chronic traumatic encephalopathy (CTE).

The CARE Consortium, which has been conducting research with college athletes across 26 sports and military cadets since 2014, has been interested in multiple facets of concussion and brain trauma.

“We’ve enrolled more than 50,000 athletes and service academy cadets into the consortium over the last 6 years to research all involved aspects including the clinical core, the imaging core, the blood biomarker core, and the genetic core, and we have a head impact measurement core.”

To investigate the pattern of concussion incidence across the football season in college players, the investigators used impact measurement technology across six Division I NCAA football programs participating in the CARE Consortium from 2015 to 2019.

A total of 658 players – all male, mean age 19 years – were fitted with the Head Impact Telemetry System (HITS) sensor arrays in their helmets to measure head impact frequency, location, and magnitude during play.

“This particular study had built-in algorithms that weeded out impacts that were below 10G of linear magnitude, because those have been determined not likely to be real impacts,” Dr. McCrea said.

Across the five seasons studied, 528,684 head impacts recorded met the quality standards for analysis. Players sustained a median of 415 (interquartile range [IQR], 190-727) impacts per season.

Of those, 68 players sustained a diagnosed concussion. In total, 48.5% of concussions occurred during preseason training, despite preseason representing only 20.8% of the football season. Total head injury exposure in the preseason occurred at twice the proportion of the regular season (324.9 vs. 162.4 impacts per team per day; mean difference, 162.6 impacts; 95% confidence interval, 110.9-214.3; P < .001).

“Preseason training often has a much higher intensity to it, in terms of the total hours, the actual training, and the heavy emphasis on full-contact drills like tackling and blocking,” said Dr. McCrea. “Even the volume of players that are participating is greater.”

Results also showed that in each of the five seasons, head injury exposure per athlete was highest in August (preseason) (median, 146.0 impacts; IQR, 63.0-247.8) and lowest in November (median, 80.0 impacts; IQR, 35.0-148.0). In the studied period, 72% of concussions and 66.9% of head injury exposure occurred in practice. Even within the regular season, total head injury exposure in practices was 84.2% higher than in games.

“This incredible dataset we have on head impact measurement also gives us the opportunity to compare it with our other research looking at the correlation between a single head impact and changes in brain structure and function on MRI, on blood biomarkers, giving us the ability to look at the connection between mechanism of effect of injury and recovery from injury,” said Dr. McCrea.

These findings also provide an opportunity to modify approaches to preseason training and football practices to keep players safer, said Dr. McCrea, noting that about half of the variance in head injury exposure is at the level of the individual athlete.

“With this large body of athletes we’ve instrumented, we can look at, for instance, all of the running backs and understand the athlete and what his head injury exposure looks like compared to all other running backs. If we find out that an athlete has a rate of head injury exposure that’s 300% higher than most other players that play the same position, we can take that data directly to the athlete to work on their technique and approach to the game.

“Every researcher wishes that their basic science or their clinical research findings will have some impact on the health and well-being of the population they’re studying. By modifying practices and preseason training, football teams could greatly reduce the risk of injury and exposure for their players, while still maintaining the competitive nature of game play,” he added.  

Through a combination of policy and education, similar strategies could be implemented to help prevent concussion and HIE in high school and youth football too, said Dr. McCrea.

‘Shocking’ findings

In an accompanying editorial, Christopher J. Nowinski, PhD, of the Concussion Legacy Foundation, Boston, and Robert C. Cantu, MD, department of neurosurgery, Emerson Hospital, Concord, Massachusetts, said the findings could have significant policy implications and offer a valuable expansion of prior research.

“From 2005 to 2010, studies on college football revealed that about two-thirds of head impacts occurred in practice,” they noted. “We cited this data in 2010 when we proposed to the NFL Players Association that the most effective way to reduce the risks of negative neurological outcomes was to reduce hitting in practice. They agreed, and in 2011 collectively bargained for severe contact limits in practice, with 14 full-contact practices allowed during the 17-week season. Since that rule was implemented, only 18% of NFL concussions have occurred in practice.”

“Against this backdrop, the results of the study by McCrea et al. are shocking,” they added. “It reveals that college football players still experience 72% of their concussions and 67% of their total head injury exposure in practice.”

Even more shocking, noted Dr. Nowinski and Dr. Cantu, is that these numbers are almost certainly an underestimate of the dangers of practice.

“As a former college football player and a former team physician, respectively, we find this situation inexcusable. Concussions in games are inevitable, but concussions in practice are preventable,” they wrote.  

“Laudably,” they added “the investigators call on the NCAA and football conferences to explore policy and rule changes to reduce concussion incidence and HIE and to create robust educational offerings to encourage change from coaches and college administrators.”

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

Novel research from the Concussion Assessment, Research and Education (CARE) Consortium sheds new light on how to effectively reduce the incidence of concussion and head injury exposure in college football.

The study, led by neurotrauma experts Michael McCrea, PhD, and Brian Stemper, PhD, professors of neurosurgery at the Medical College of Wisconsin in Milwaukee, reports data from hundreds of college football players across five seasons and shows concussion incidence and head injury exposure are disproportionately higher in the preseason versus the regular season.

The research also reveals that such injuries occur more often during practices than games.

“We think that with the findings from this paper, there’s a role for everybody to play in reducing injury,” Dr. McCrea said. “We hope these data help inform broad-based policy about practice and preseason training policies in collegiate football. We also think there’s a role for athletic administrators, coaches, and even athletes themselves.”

The study was published online Feb. 1 in JAMA Neurology.
 

More injuries in preseason

Concussion is one of the most common injuries in football. Beyond these harms are growing concerns that repetitive HIE may increase the risk of long-term neurologic health problems including chronic traumatic encephalopathy (CTE).

The CARE Consortium, which has been conducting research with college athletes across 26 sports and military cadets since 2014, has been interested in multiple facets of concussion and brain trauma.

“We’ve enrolled more than 50,000 athletes and service academy cadets into the consortium over the last 6 years to research all involved aspects including the clinical core, the imaging core, the blood biomarker core, and the genetic core, and we have a head impact measurement core.”

To investigate the pattern of concussion incidence across the football season in college players, the investigators used impact measurement technology across six Division I NCAA football programs participating in the CARE Consortium from 2015 to 2019.

A total of 658 players – all male, mean age 19 years – were fitted with the Head Impact Telemetry System (HITS) sensor arrays in their helmets to measure head impact frequency, location, and magnitude during play.

“This particular study had built-in algorithms that weeded out impacts that were below 10G of linear magnitude, because those have been determined not likely to be real impacts,” Dr. McCrea said.

Across the five seasons studied, 528,684 head impacts recorded met the quality standards for analysis. Players sustained a median of 415 (interquartile range [IQR], 190-727) impacts per season.

Of those, 68 players sustained a diagnosed concussion. In total, 48.5% of concussions occurred during preseason training, despite preseason representing only 20.8% of the football season. Total head injury exposure in the preseason occurred at twice the proportion of the regular season (324.9 vs. 162.4 impacts per team per day; mean difference, 162.6 impacts; 95% confidence interval, 110.9-214.3; P < .001).

“Preseason training often has a much higher intensity to it, in terms of the total hours, the actual training, and the heavy emphasis on full-contact drills like tackling and blocking,” said Dr. McCrea. “Even the volume of players that are participating is greater.”

Results also showed that in each of the five seasons, head injury exposure per athlete was highest in August (preseason) (median, 146.0 impacts; IQR, 63.0-247.8) and lowest in November (median, 80.0 impacts; IQR, 35.0-148.0). In the studied period, 72% of concussions and 66.9% of head injury exposure occurred in practice. Even within the regular season, total head injury exposure in practices was 84.2% higher than in games.

“This incredible dataset we have on head impact measurement also gives us the opportunity to compare it with our other research looking at the correlation between a single head impact and changes in brain structure and function on MRI, on blood biomarkers, giving us the ability to look at the connection between mechanism of effect of injury and recovery from injury,” said Dr. McCrea.

These findings also provide an opportunity to modify approaches to preseason training and football practices to keep players safer, said Dr. McCrea, noting that about half of the variance in head injury exposure is at the level of the individual athlete.

“With this large body of athletes we’ve instrumented, we can look at, for instance, all of the running backs and understand the athlete and what his head injury exposure looks like compared to all other running backs. If we find out that an athlete has a rate of head injury exposure that’s 300% higher than most other players that play the same position, we can take that data directly to the athlete to work on their technique and approach to the game.

“Every researcher wishes that their basic science or their clinical research findings will have some impact on the health and well-being of the population they’re studying. By modifying practices and preseason training, football teams could greatly reduce the risk of injury and exposure for their players, while still maintaining the competitive nature of game play,” he added.  

Through a combination of policy and education, similar strategies could be implemented to help prevent concussion and HIE in high school and youth football too, said Dr. McCrea.

‘Shocking’ findings

In an accompanying editorial, Christopher J. Nowinski, PhD, of the Concussion Legacy Foundation, Boston, and Robert C. Cantu, MD, department of neurosurgery, Emerson Hospital, Concord, Massachusetts, said the findings could have significant policy implications and offer a valuable expansion of prior research.

“From 2005 to 2010, studies on college football revealed that about two-thirds of head impacts occurred in practice,” they noted. “We cited this data in 2010 when we proposed to the NFL Players Association that the most effective way to reduce the risks of negative neurological outcomes was to reduce hitting in practice. They agreed, and in 2011 collectively bargained for severe contact limits in practice, with 14 full-contact practices allowed during the 17-week season. Since that rule was implemented, only 18% of NFL concussions have occurred in practice.”

“Against this backdrop, the results of the study by McCrea et al. are shocking,” they added. “It reveals that college football players still experience 72% of their concussions and 67% of their total head injury exposure in practice.”

Even more shocking, noted Dr. Nowinski and Dr. Cantu, is that these numbers are almost certainly an underestimate of the dangers of practice.

“As a former college football player and a former team physician, respectively, we find this situation inexcusable. Concussions in games are inevitable, but concussions in practice are preventable,” they wrote.  

“Laudably,” they added “the investigators call on the NCAA and football conferences to explore policy and rule changes to reduce concussion incidence and HIE and to create robust educational offerings to encourage change from coaches and college administrators.”

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

More than 50% of health care workers infected with SARS-CoV-2 report that their sense of smell has not returned to normal an average of 5 months post infection, new research shows.

Nenad Cavoski/iStock/Getty Images Plus

The findings illustrate that olfactory problems are common not only during the acute COVID-19 phase but also “in the long run” and that these problems should be “taken into consideration” when following up these patients, study investigator Johannes Frasnelli, MD, professor, department of anatomy, Université du Québec à Trois-Rivières, said in an interview.

Loss of the sense of smell can affect quality of life because it affects eating and drinking, and may even be dangerous, said Dr. Frasnelli. “If your sense of smell is impaired, you may unknowingly eat spoiled food, or you may not smell smoke or gas in your home,” he said. In addition, Dr. Frasnelli noted that an impaired sense of smell is associated with higher rates of depression. The findings will be presented at the annual meeting of the American Academy of Neurology in April.

‘Striking’ finding

Research shows that about 60% of patients with COVID-19 lose their sense of smell to some degree during the acute phase of the disease. “But we wanted to go further and look at the longer-term effects of loss of smell and taste,” said Dr. Frasnelli.

The analysis included 813 health care workers in the province of Quebec. For all the patients, SARS-CoV-2 infection was confirmed through testing with a nasopharyngeal viral swab.

Participants completed a 64-item online questionnaire that asked about three senses: olfactory; gustatory, which includes tastes such as sweet, sour, bitter, salty, savory and umami; and trigeminal, which includes sensations such as spiciness of hot peppers and “coolness” of mint.

They were asked to rate these on a scale of 0 (no perception) to 10 (very strong perception) before the infection, during the infection, and currently. They were also asked about other symptoms, including fatigue.

Most respondents had been infected in the first wave of the virus in March and April of 2020 and responded to the questionnaire an average of 5 months later.

The vast majority of respondents (84.1%) were women, which Dr. Frasnelli said was not surprising because women predominate in the health care field.

The analysis showed that average smell ratings were 8.98 before infection, 2.85 during the acute phase, and 7.41 when respondents answered the questionnaire. The sense of taste was less affected and recovered faster than did the sense of smell. Results for taste were 9.20 before infection, 3.59 during the acute phase, and 8.05 after COVID-19.

Among 580 respondents who indicated a compromised sense of smell during the acute phase, the average smell rating when answering the questionnaire was 6.89, compared to 9.03 before the infection. More than half (51.2%) reported not regaining full olfactory function.

The fact that the sense of smell had not returned to normal for half the participants so long after being infected is “novel and quite striking,” said Dr. Frasnelli.

However, he noted, this doesn’t necessarily mean all those with a compromised sense of smell “have huge problems.” In some cases, he said, the problem “is more subtle.”
 

Not a CNS problem?

Respondents also completed a chemosensory dysfunction home test (CD-HT). They were asked to prepare common household food items, such as peanut butter, sugar, salt, and vinegar, in a particular way – for example, to add sugar or salt to water – and provide feedback on how they smell and taste.

For this CD-HT analysis, 18.4% of respondents reported having persistent loss of smell. This, Dr. Frasnelli said, adds to evidence from self-reported responses and suggests that in some cases, the problem is more than senses not returning to normal.

“From the questionnaires, roughly 50% said their sense of smell is still not back to normal, and when we look at the CD home test, we see that almost 20% of subjects indeed have pretty strong impairment of their sense of smell,” he said.

The results showed no sex differences, although Dr. Frasnelli noted that most of the sample were women. “It’s tricky to look at the data with regard to sex because it’s a bit skewed,” he said.

Male respondents were older than female participants, but there was no difference in impairment between age groups. Dr. Frasnelli said this was “quite interesting,” inasmuch as older people usually lose some sense of smell.

The researchers have not yet examined whether the results differ by type of health care worker.

They also have not examined in detail whether infection severity affects the risk for extended olfactory impairment. Although some research suggests that the problem with smell is more common in less severe cases, Dr. Frasnelli noted this could be because loss of smell is not a huge problem for patients battling grave health problems.

As for other symptoms, many respondents reported lingering fatigue; some reported debilitating fatigue, said Dr. Frasnelli. However, he cautioned that this is difficult to interpret, because the participants were health care workers, many of whom returned to work during the pandemic and perhaps had not fully rested.

He also noted that he and his colleagues have not “made the link” between impaired smell and the degree of fatigue.

The COVID-19 virus appears to attack supporting sustentacular cells in the olfactory epithelium, not nerve cells.

“Right now, it seems that the smell problem is not a central nervous system problem but a peripheral problem,” said Dr. Frasnelli. “But we don’t know for sure; it may be that the virus somehow gets into the brain and some symptoms are caused by the effects of the infection on the brain.”

The researchers will extend their research with another questionnaire to assess senses 10-12 months after COVID-19.

Limitations of the study include the subjective nature of the smell and taste ratings and the single time point at which data were collected.
 

Confirmatory findings

Commenting on the research in an interview, Thomas Hummel, MD, professor, smell and taste clinic, department of otorhinolaryngology, Technische Universität Dresden (Germany), said the new results regarding loss of smell after COVID-19 are “very congruent” with what he and his colleagues have observed.

Research shows that up to one in five of those infected with SARS-CoV-2 experience olfactory loss. “While the numbers may vary a bit from study to study or lab to lab, I think 5% to 20% of post–COVID-19 patients exhibit long-term olfactory loss,” Dr. Hummel said.

His group has observed that “many more are not back to normal,” which conforms with what Dr. Frasnelli’s study reveals, said Dr. Hummel.

Also commenting on the research, Kenneth L. Tyler, MD, professor of neurology, University of Colorado at Denver, Aurora, and a fellow of the American Academy of Neurology, said the study was relatively large and the results “interesting.”

Although it “provides more evidence there’s a subset of patients with symptoms even well past the acute phase” of COVID-19, the results are “mostly confirmatory” and include “nothing super surprising,” Dr. Tyler said in an interview.

However, the investigators did attempt to make the study “a little more quantitative” and “to confirm the self-reporting with their validated CD home test,” he said.

Dr. Tyler wondered how representative the sample was and whether the study drew more participants with impaired senses. “If I had a loss of smell or taste, maybe I would be more likely to respond to such a survey,” he said.

He also noted the difficulty of separating loss of smell from loss of taste.

“If you lose your sense of smell, things don’t taste right, so it can be confounding as to how to separate out those two,” he noted.
The study was supported by the Foundation of the Université du Québec à Trois-Rivières and the Province of Quebec. Dr. Frasnelli has received royalties from Styriabooks in Austria for a book on olfaction published in 2019 and has received honoraria for speaking engagements. Dr. Hummel and Dr. Tyler have disclosed no relevant financial relationships.

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

More than 50% of health care workers infected with SARS-CoV-2 report that their sense of smell has not returned to normal an average of 5 months post infection, new research shows.

Nenad Cavoski/iStock/Getty Images Plus

The findings illustrate that olfactory problems are common not only during the acute COVID-19 phase but also “in the long run” and that these problems should be “taken into consideration” when following up these patients, study investigator Johannes Frasnelli, MD, professor, department of anatomy, Université du Québec à Trois-Rivières, said in an interview.

Loss of the sense of smell can affect quality of life because it affects eating and drinking, and may even be dangerous, said Dr. Frasnelli. “If your sense of smell is impaired, you may unknowingly eat spoiled food, or you may not smell smoke or gas in your home,” he said. In addition, Dr. Frasnelli noted that an impaired sense of smell is associated with higher rates of depression. The findings will be presented at the annual meeting of the American Academy of Neurology in April.

‘Striking’ finding

Research shows that about 60% of patients with COVID-19 lose their sense of smell to some degree during the acute phase of the disease. “But we wanted to go further and look at the longer-term effects of loss of smell and taste,” said Dr. Frasnelli.

The analysis included 813 health care workers in the province of Quebec. For all the patients, SARS-CoV-2 infection was confirmed through testing with a nasopharyngeal viral swab.

Participants completed a 64-item online questionnaire that asked about three senses: olfactory; gustatory, which includes tastes such as sweet, sour, bitter, salty, savory and umami; and trigeminal, which includes sensations such as spiciness of hot peppers and “coolness” of mint.

They were asked to rate these on a scale of 0 (no perception) to 10 (very strong perception) before the infection, during the infection, and currently. They were also asked about other symptoms, including fatigue.

Most respondents had been infected in the first wave of the virus in March and April of 2020 and responded to the questionnaire an average of 5 months later.

The vast majority of respondents (84.1%) were women, which Dr. Frasnelli said was not surprising because women predominate in the health care field.

The analysis showed that average smell ratings were 8.98 before infection, 2.85 during the acute phase, and 7.41 when respondents answered the questionnaire. The sense of taste was less affected and recovered faster than did the sense of smell. Results for taste were 9.20 before infection, 3.59 during the acute phase, and 8.05 after COVID-19.

Among 580 respondents who indicated a compromised sense of smell during the acute phase, the average smell rating when answering the questionnaire was 6.89, compared to 9.03 before the infection. More than half (51.2%) reported not regaining full olfactory function.

The fact that the sense of smell had not returned to normal for half the participants so long after being infected is “novel and quite striking,” said Dr. Frasnelli.

However, he noted, this doesn’t necessarily mean all those with a compromised sense of smell “have huge problems.” In some cases, he said, the problem “is more subtle.”
 

Not a CNS problem?

Respondents also completed a chemosensory dysfunction home test (CD-HT). They were asked to prepare common household food items, such as peanut butter, sugar, salt, and vinegar, in a particular way – for example, to add sugar or salt to water – and provide feedback on how they smell and taste.

For this CD-HT analysis, 18.4% of respondents reported having persistent loss of smell. This, Dr. Frasnelli said, adds to evidence from self-reported responses and suggests that in some cases, the problem is more than senses not returning to normal.

“From the questionnaires, roughly 50% said their sense of smell is still not back to normal, and when we look at the CD home test, we see that almost 20% of subjects indeed have pretty strong impairment of their sense of smell,” he said.

The results showed no sex differences, although Dr. Frasnelli noted that most of the sample were women. “It’s tricky to look at the data with regard to sex because it’s a bit skewed,” he said.

Male respondents were older than female participants, but there was no difference in impairment between age groups. Dr. Frasnelli said this was “quite interesting,” inasmuch as older people usually lose some sense of smell.

The researchers have not yet examined whether the results differ by type of health care worker.

They also have not examined in detail whether infection severity affects the risk for extended olfactory impairment. Although some research suggests that the problem with smell is more common in less severe cases, Dr. Frasnelli noted this could be because loss of smell is not a huge problem for patients battling grave health problems.

As for other symptoms, many respondents reported lingering fatigue; some reported debilitating fatigue, said Dr. Frasnelli. However, he cautioned that this is difficult to interpret, because the participants were health care workers, many of whom returned to work during the pandemic and perhaps had not fully rested.

He also noted that he and his colleagues have not “made the link” between impaired smell and the degree of fatigue.

The COVID-19 virus appears to attack supporting sustentacular cells in the olfactory epithelium, not nerve cells.

“Right now, it seems that the smell problem is not a central nervous system problem but a peripheral problem,” said Dr. Frasnelli. “But we don’t know for sure; it may be that the virus somehow gets into the brain and some symptoms are caused by the effects of the infection on the brain.”

The researchers will extend their research with another questionnaire to assess senses 10-12 months after COVID-19.

Limitations of the study include the subjective nature of the smell and taste ratings and the single time point at which data were collected.
 

Confirmatory findings

Commenting on the research in an interview, Thomas Hummel, MD, professor, smell and taste clinic, department of otorhinolaryngology, Technische Universität Dresden (Germany), said the new results regarding loss of smell after COVID-19 are “very congruent” with what he and his colleagues have observed.

Research shows that up to one in five of those infected with SARS-CoV-2 experience olfactory loss. “While the numbers may vary a bit from study to study or lab to lab, I think 5% to 20% of post–COVID-19 patients exhibit long-term olfactory loss,” Dr. Hummel said.

His group has observed that “many more are not back to normal,” which conforms with what Dr. Frasnelli’s study reveals, said Dr. Hummel.

Also commenting on the research, Kenneth L. Tyler, MD, professor of neurology, University of Colorado at Denver, Aurora, and a fellow of the American Academy of Neurology, said the study was relatively large and the results “interesting.”

Although it “provides more evidence there’s a subset of patients with symptoms even well past the acute phase” of COVID-19, the results are “mostly confirmatory” and include “nothing super surprising,” Dr. Tyler said in an interview.

However, the investigators did attempt to make the study “a little more quantitative” and “to confirm the self-reporting with their validated CD home test,” he said.

Dr. Tyler wondered how representative the sample was and whether the study drew more participants with impaired senses. “If I had a loss of smell or taste, maybe I would be more likely to respond to such a survey,” he said.

He also noted the difficulty of separating loss of smell from loss of taste.

“If you lose your sense of smell, things don’t taste right, so it can be confounding as to how to separate out those two,” he noted.
The study was supported by the Foundation of the Université du Québec à Trois-Rivières and the Province of Quebec. Dr. Frasnelli has received royalties from Styriabooks in Austria for a book on olfaction published in 2019 and has received honoraria for speaking engagements. Dr. Hummel and Dr. Tyler have disclosed no relevant financial relationships.

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

More than 50% of health care workers infected with SARS-CoV-2 report that their sense of smell has not returned to normal an average of 5 months post infection, new research shows.

Nenad Cavoski/iStock/Getty Images Plus

The findings illustrate that olfactory problems are common not only during the acute COVID-19 phase but also “in the long run” and that these problems should be “taken into consideration” when following up these patients, study investigator Johannes Frasnelli, MD, professor, department of anatomy, Université du Québec à Trois-Rivières, said in an interview.

Loss of the sense of smell can affect quality of life because it affects eating and drinking, and may even be dangerous, said Dr. Frasnelli. “If your sense of smell is impaired, you may unknowingly eat spoiled food, or you may not smell smoke or gas in your home,” he said. In addition, Dr. Frasnelli noted that an impaired sense of smell is associated with higher rates of depression. The findings will be presented at the annual meeting of the American Academy of Neurology in April.

‘Striking’ finding

Research shows that about 60% of patients with COVID-19 lose their sense of smell to some degree during the acute phase of the disease. “But we wanted to go further and look at the longer-term effects of loss of smell and taste,” said Dr. Frasnelli.

The analysis included 813 health care workers in the province of Quebec. For all the patients, SARS-CoV-2 infection was confirmed through testing with a nasopharyngeal viral swab.

Participants completed a 64-item online questionnaire that asked about three senses: olfactory; gustatory, which includes tastes such as sweet, sour, bitter, salty, savory and umami; and trigeminal, which includes sensations such as spiciness of hot peppers and “coolness” of mint.

They were asked to rate these on a scale of 0 (no perception) to 10 (very strong perception) before the infection, during the infection, and currently. They were also asked about other symptoms, including fatigue.

Most respondents had been infected in the first wave of the virus in March and April of 2020 and responded to the questionnaire an average of 5 months later.

The vast majority of respondents (84.1%) were women, which Dr. Frasnelli said was not surprising because women predominate in the health care field.

The analysis showed that average smell ratings were 8.98 before infection, 2.85 during the acute phase, and 7.41 when respondents answered the questionnaire. The sense of taste was less affected and recovered faster than did the sense of smell. Results for taste were 9.20 before infection, 3.59 during the acute phase, and 8.05 after COVID-19.

Among 580 respondents who indicated a compromised sense of smell during the acute phase, the average smell rating when answering the questionnaire was 6.89, compared to 9.03 before the infection. More than half (51.2%) reported not regaining full olfactory function.

The fact that the sense of smell had not returned to normal for half the participants so long after being infected is “novel and quite striking,” said Dr. Frasnelli.

However, he noted, this doesn’t necessarily mean all those with a compromised sense of smell “have huge problems.” In some cases, he said, the problem “is more subtle.”
 

Not a CNS problem?

Respondents also completed a chemosensory dysfunction home test (CD-HT). They were asked to prepare common household food items, such as peanut butter, sugar, salt, and vinegar, in a particular way – for example, to add sugar or salt to water – and provide feedback on how they smell and taste.

For this CD-HT analysis, 18.4% of respondents reported having persistent loss of smell. This, Dr. Frasnelli said, adds to evidence from self-reported responses and suggests that in some cases, the problem is more than senses not returning to normal.

“From the questionnaires, roughly 50% said their sense of smell is still not back to normal, and when we look at the CD home test, we see that almost 20% of subjects indeed have pretty strong impairment of their sense of smell,” he said.

The results showed no sex differences, although Dr. Frasnelli noted that most of the sample were women. “It’s tricky to look at the data with regard to sex because it’s a bit skewed,” he said.

Male respondents were older than female participants, but there was no difference in impairment between age groups. Dr. Frasnelli said this was “quite interesting,” inasmuch as older people usually lose some sense of smell.

The researchers have not yet examined whether the results differ by type of health care worker.

They also have not examined in detail whether infection severity affects the risk for extended olfactory impairment. Although some research suggests that the problem with smell is more common in less severe cases, Dr. Frasnelli noted this could be because loss of smell is not a huge problem for patients battling grave health problems.

As for other symptoms, many respondents reported lingering fatigue; some reported debilitating fatigue, said Dr. Frasnelli. However, he cautioned that this is difficult to interpret, because the participants were health care workers, many of whom returned to work during the pandemic and perhaps had not fully rested.

He also noted that he and his colleagues have not “made the link” between impaired smell and the degree of fatigue.

The COVID-19 virus appears to attack supporting sustentacular cells in the olfactory epithelium, not nerve cells.

“Right now, it seems that the smell problem is not a central nervous system problem but a peripheral problem,” said Dr. Frasnelli. “But we don’t know for sure; it may be that the virus somehow gets into the brain and some symptoms are caused by the effects of the infection on the brain.”

The researchers will extend their research with another questionnaire to assess senses 10-12 months after COVID-19.

Limitations of the study include the subjective nature of the smell and taste ratings and the single time point at which data were collected.
 

Confirmatory findings

Commenting on the research in an interview, Thomas Hummel, MD, professor, smell and taste clinic, department of otorhinolaryngology, Technische Universität Dresden (Germany), said the new results regarding loss of smell after COVID-19 are “very congruent” with what he and his colleagues have observed.

Research shows that up to one in five of those infected with SARS-CoV-2 experience olfactory loss. “While the numbers may vary a bit from study to study or lab to lab, I think 5% to 20% of post–COVID-19 patients exhibit long-term olfactory loss,” Dr. Hummel said.

His group has observed that “many more are not back to normal,” which conforms with what Dr. Frasnelli’s study reveals, said Dr. Hummel.

Also commenting on the research, Kenneth L. Tyler, MD, professor of neurology, University of Colorado at Denver, Aurora, and a fellow of the American Academy of Neurology, said the study was relatively large and the results “interesting.”

Although it “provides more evidence there’s a subset of patients with symptoms even well past the acute phase” of COVID-19, the results are “mostly confirmatory” and include “nothing super surprising,” Dr. Tyler said in an interview.

However, the investigators did attempt to make the study “a little more quantitative” and “to confirm the self-reporting with their validated CD home test,” he said.

Dr. Tyler wondered how representative the sample was and whether the study drew more participants with impaired senses. “If I had a loss of smell or taste, maybe I would be more likely to respond to such a survey,” he said.

He also noted the difficulty of separating loss of smell from loss of taste.

“If you lose your sense of smell, things don’t taste right, so it can be confounding as to how to separate out those two,” he noted.
The study was supported by the Foundation of the Université du Québec à Trois-Rivières and the Province of Quebec. Dr. Frasnelli has received royalties from Styriabooks in Austria for a book on olfaction published in 2019 and has received honoraria for speaking engagements. Dr. Hummel and Dr. Tyler have disclosed no relevant financial relationships.

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