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Loss of vestibular function is a key contributor to a well-documented increased risk for falls in patients with Alzheimer’s disease (AD), new research confirms.

Falls are twice as common in patients with AD versu older individuals without the disorder and significantly increase the likelihood of institutionalization.

However, researchers recorded fewer falls in patients with a better functioning vestibular system, which detects head movements and plays a critical role in spatial orientation, posture, gait, and balance.

The results suggest that improving vestibular function with currently available therapies may prevent falls, something the researchers will investigate in a new clinical trial launching next month.

“One of the most dangerous and impactful symptoms in terms of function in patients with Alzheimer’s disease is their increased predisposition to falls,” study investigator Yuri Agrawal, MD, department of otolaryngology–head and neck surgery, Johns Hopkins University School of Medicine, Baltimore, said in an interview. “Alzheimer’s is the sixth leading cause of death in the U.S., and some people actually say that that high mortality rate is because of their predisposition to falls and the injuries that occur.”

The study was published online Feb. 14 in the Journal of Alzheimer’s Disease.
 

The ‘sixth hidden sense’

The vestibular system consists of three semicircular canals, which detect rotational head movement, and two otolith organs called the utricle and the saccule, which sense linear head movements and the orientation of the head with respect to gravity.

“We call the vestibular system the sixth hidden sense because it’s not a conscious perception like taste or smell,” Dr. Agrawal said. “It’s constantly providing input to our brain about where we are in space.”

Dr. Agrawal and colleagues previously reported that vestibular loss is twice as common in Alzheimer’s patients as in cognitively unimpaired age-matched controls. Now, they wanted to know if this sensory loss was associated with an increased risk for falls in this population.

The study included 48 patients age greater than or equal to 60 years with mild-to-moderate AD between 2018 and 2020. They also included an age-matched control group of healthy controls with no cognitive impairment.

Researchers assessed vestibular function at baseline by measuring semicircular canal and saccular function. One test required participants to wear goggles and complete a series of tests with their eyes open and closed while researchers recorded their eye movement with video-oculography. They also measured participants’ balance using the Berg Balance Scale.

Relative to matched controls, AD patients exhibited increased lateral instability when their eyes were open (P = .033) and closed (P = .042). Studies suggest that lateral stability declines more quickly with age and that instability with eyes closed is the single biggest predictor of incident falls in community-dwelling adults.

To determine if poor vestibular function increased fall risk in patients with AD, researchers followed the cohort for up to 2 years.

“We found that patients with vestibular loss at baseline were 50% more likely to fall, adjusting for other factors that could contribute to that,” Dr. Agrawal said.

Specifically, better semicircular canal function was significantly associated with lower likelihood of falls, even after adjusting for confounders (adjusted hazard ratio, 0.65; P = .009).
 

Can therapy help?

Commenting on the findings, James Burke, MD, PhD, professor of neurology at Duke University Medical Center, Durham, N.C., said that the finding that impaired vestibular function is associated with increased falls “significantly advances our understanding of the topic” and suggests that treating vestibular dysfunction could reduce falls in Alzheimer’s patients.

“Screening patients with Alzheimer’s disease for impaired vestibular function could lead to identification of individuals at high risk of falls and target those who would benefit from vestibular therapy,” he said.

Vestibular rehabilitation therapy is often used to treat a number of disorders related to vestibular function loss. There are also studies underway to measure the efficacy of a vestibular implant that works much like a cochlear implant.

While evaluation of vestibular function is currently not routinely included in AD care, studies such as these suggest it may be time to consider adding it to the standard of care, Jennifer Coto, PhD, assistant professor of otolaryngology at the University of Miami Miller School of Medicine, said in an interview.

“Best practice guidelines for management of Alzheimer’s patients should be revised to include routine vestibular evaluation and support from a multidisciplinary team that may address other crucial areas of functioning, particularly psychological functioning, sleep, and independence,” she said.

“Future research also needs to evaluate the effectiveness of vestibular therapy in patients with Alzheimer’s and the benefits of early identification and intervention for preventing recurrent falls.”

Dr. Agrawal is leading a 5-year, $3.5 million National Institute on Aging study that seeks to do just that. Enrollment in the study begins next month. Patients will complete an initial in-person screening, but the remainder of the study will be conducted virtually.

Therapies will be noninvasive, nonpharmaceutical, and performed in participants’ homes. If the therapy is successful at reducing falls, Dr. Agrawal said the virtual design would significantly broaden its potential patient reach.

The study was funded by the National Institute on Aging. Study authors’ disclosures are reported in the original article. Dr. Coto and Dr. Burke report no relevant financial relationships.

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

Loss of vestibular function is a key contributor to a well-documented increased risk for falls in patients with Alzheimer’s disease (AD), new research confirms.

Falls are twice as common in patients with AD versu older individuals without the disorder and significantly increase the likelihood of institutionalization.

However, researchers recorded fewer falls in patients with a better functioning vestibular system, which detects head movements and plays a critical role in spatial orientation, posture, gait, and balance.

The results suggest that improving vestibular function with currently available therapies may prevent falls, something the researchers will investigate in a new clinical trial launching next month.

“One of the most dangerous and impactful symptoms in terms of function in patients with Alzheimer’s disease is their increased predisposition to falls,” study investigator Yuri Agrawal, MD, department of otolaryngology–head and neck surgery, Johns Hopkins University School of Medicine, Baltimore, said in an interview. “Alzheimer’s is the sixth leading cause of death in the U.S., and some people actually say that that high mortality rate is because of their predisposition to falls and the injuries that occur.”

The study was published online Feb. 14 in the Journal of Alzheimer’s Disease.
 

The ‘sixth hidden sense’

The vestibular system consists of three semicircular canals, which detect rotational head movement, and two otolith organs called the utricle and the saccule, which sense linear head movements and the orientation of the head with respect to gravity.

“We call the vestibular system the sixth hidden sense because it’s not a conscious perception like taste or smell,” Dr. Agrawal said. “It’s constantly providing input to our brain about where we are in space.”

Dr. Agrawal and colleagues previously reported that vestibular loss is twice as common in Alzheimer’s patients as in cognitively unimpaired age-matched controls. Now, they wanted to know if this sensory loss was associated with an increased risk for falls in this population.

The study included 48 patients age greater than or equal to 60 years with mild-to-moderate AD between 2018 and 2020. They also included an age-matched control group of healthy controls with no cognitive impairment.

Researchers assessed vestibular function at baseline by measuring semicircular canal and saccular function. One test required participants to wear goggles and complete a series of tests with their eyes open and closed while researchers recorded their eye movement with video-oculography. They also measured participants’ balance using the Berg Balance Scale.

Relative to matched controls, AD patients exhibited increased lateral instability when their eyes were open (P = .033) and closed (P = .042). Studies suggest that lateral stability declines more quickly with age and that instability with eyes closed is the single biggest predictor of incident falls in community-dwelling adults.

To determine if poor vestibular function increased fall risk in patients with AD, researchers followed the cohort for up to 2 years.

“We found that patients with vestibular loss at baseline were 50% more likely to fall, adjusting for other factors that could contribute to that,” Dr. Agrawal said.

Specifically, better semicircular canal function was significantly associated with lower likelihood of falls, even after adjusting for confounders (adjusted hazard ratio, 0.65; P = .009).
 

Can therapy help?

Commenting on the findings, James Burke, MD, PhD, professor of neurology at Duke University Medical Center, Durham, N.C., said that the finding that impaired vestibular function is associated with increased falls “significantly advances our understanding of the topic” and suggests that treating vestibular dysfunction could reduce falls in Alzheimer’s patients.

“Screening patients with Alzheimer’s disease for impaired vestibular function could lead to identification of individuals at high risk of falls and target those who would benefit from vestibular therapy,” he said.

Vestibular rehabilitation therapy is often used to treat a number of disorders related to vestibular function loss. There are also studies underway to measure the efficacy of a vestibular implant that works much like a cochlear implant.

While evaluation of vestibular function is currently not routinely included in AD care, studies such as these suggest it may be time to consider adding it to the standard of care, Jennifer Coto, PhD, assistant professor of otolaryngology at the University of Miami Miller School of Medicine, said in an interview.

“Best practice guidelines for management of Alzheimer’s patients should be revised to include routine vestibular evaluation and support from a multidisciplinary team that may address other crucial areas of functioning, particularly psychological functioning, sleep, and independence,” she said.

“Future research also needs to evaluate the effectiveness of vestibular therapy in patients with Alzheimer’s and the benefits of early identification and intervention for preventing recurrent falls.”

Dr. Agrawal is leading a 5-year, $3.5 million National Institute on Aging study that seeks to do just that. Enrollment in the study begins next month. Patients will complete an initial in-person screening, but the remainder of the study will be conducted virtually.

Therapies will be noninvasive, nonpharmaceutical, and performed in participants’ homes. If the therapy is successful at reducing falls, Dr. Agrawal said the virtual design would significantly broaden its potential patient reach.

The study was funded by the National Institute on Aging. Study authors’ disclosures are reported in the original article. Dr. Coto and Dr. Burke report no relevant financial relationships.

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

Loss of vestibular function is a key contributor to a well-documented increased risk for falls in patients with Alzheimer’s disease (AD), new research confirms.

Falls are twice as common in patients with AD versu older individuals without the disorder and significantly increase the likelihood of institutionalization.

However, researchers recorded fewer falls in patients with a better functioning vestibular system, which detects head movements and plays a critical role in spatial orientation, posture, gait, and balance.

The results suggest that improving vestibular function with currently available therapies may prevent falls, something the researchers will investigate in a new clinical trial launching next month.

“One of the most dangerous and impactful symptoms in terms of function in patients with Alzheimer’s disease is their increased predisposition to falls,” study investigator Yuri Agrawal, MD, department of otolaryngology–head and neck surgery, Johns Hopkins University School of Medicine, Baltimore, said in an interview. “Alzheimer’s is the sixth leading cause of death in the U.S., and some people actually say that that high mortality rate is because of their predisposition to falls and the injuries that occur.”

The study was published online Feb. 14 in the Journal of Alzheimer’s Disease.
 

The ‘sixth hidden sense’

The vestibular system consists of three semicircular canals, which detect rotational head movement, and two otolith organs called the utricle and the saccule, which sense linear head movements and the orientation of the head with respect to gravity.

“We call the vestibular system the sixth hidden sense because it’s not a conscious perception like taste or smell,” Dr. Agrawal said. “It’s constantly providing input to our brain about where we are in space.”

Dr. Agrawal and colleagues previously reported that vestibular loss is twice as common in Alzheimer’s patients as in cognitively unimpaired age-matched controls. Now, they wanted to know if this sensory loss was associated with an increased risk for falls in this population.

The study included 48 patients age greater than or equal to 60 years with mild-to-moderate AD between 2018 and 2020. They also included an age-matched control group of healthy controls with no cognitive impairment.

Researchers assessed vestibular function at baseline by measuring semicircular canal and saccular function. One test required participants to wear goggles and complete a series of tests with their eyes open and closed while researchers recorded their eye movement with video-oculography. They also measured participants’ balance using the Berg Balance Scale.

Relative to matched controls, AD patients exhibited increased lateral instability when their eyes were open (P = .033) and closed (P = .042). Studies suggest that lateral stability declines more quickly with age and that instability with eyes closed is the single biggest predictor of incident falls in community-dwelling adults.

To determine if poor vestibular function increased fall risk in patients with AD, researchers followed the cohort for up to 2 years.

“We found that patients with vestibular loss at baseline were 50% more likely to fall, adjusting for other factors that could contribute to that,” Dr. Agrawal said.

Specifically, better semicircular canal function was significantly associated with lower likelihood of falls, even after adjusting for confounders (adjusted hazard ratio, 0.65; P = .009).
 

Can therapy help?

Commenting on the findings, James Burke, MD, PhD, professor of neurology at Duke University Medical Center, Durham, N.C., said that the finding that impaired vestibular function is associated with increased falls “significantly advances our understanding of the topic” and suggests that treating vestibular dysfunction could reduce falls in Alzheimer’s patients.

“Screening patients with Alzheimer’s disease for impaired vestibular function could lead to identification of individuals at high risk of falls and target those who would benefit from vestibular therapy,” he said.

Vestibular rehabilitation therapy is often used to treat a number of disorders related to vestibular function loss. There are also studies underway to measure the efficacy of a vestibular implant that works much like a cochlear implant.

While evaluation of vestibular function is currently not routinely included in AD care, studies such as these suggest it may be time to consider adding it to the standard of care, Jennifer Coto, PhD, assistant professor of otolaryngology at the University of Miami Miller School of Medicine, said in an interview.

“Best practice guidelines for management of Alzheimer’s patients should be revised to include routine vestibular evaluation and support from a multidisciplinary team that may address other crucial areas of functioning, particularly psychological functioning, sleep, and independence,” she said.

“Future research also needs to evaluate the effectiveness of vestibular therapy in patients with Alzheimer’s and the benefits of early identification and intervention for preventing recurrent falls.”

Dr. Agrawal is leading a 5-year, $3.5 million National Institute on Aging study that seeks to do just that. Enrollment in the study begins next month. Patients will complete an initial in-person screening, but the remainder of the study will be conducted virtually.

Therapies will be noninvasive, nonpharmaceutical, and performed in participants’ homes. If the therapy is successful at reducing falls, Dr. Agrawal said the virtual design would significantly broaden its potential patient reach.

The study was funded by the National Institute on Aging. Study authors’ disclosures are reported in the original article. Dr. Coto and Dr. Burke report no relevant financial relationships.

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

It’s no secret that heavy drinking is linked to potential health problems, from liver damage to a higher risk of cancer. But most people probably wouldn’t think a nightcap every evening is much of a health threat.

Now, new evidence published in Nature Communications suggests even one drink a day is linked to detectable changes in the brain, though it’s not clear whether the alcohol is causing the differences.

Previous research has found that people with alcohol use disorder have structural changes in their brains, compared with healthy people’s brains, such as reduced gray-matter and white-matter volume.

But those findings were in people with a history of heavy drinking, defined by the National Institute on Alcohol Abuse and Alcoholism as more than four drinks a day for men and more than three drinks a day for women.

The national dietary guidelines from the U.S. Department of Health & Human Services advise drinking no more than two standard drinks for men and one drink for women each day. A standard drink in the United States is 12 ounces of beer, 5 ounces of wine, or 1½ ounce of liquor.

But could even this modest amount of alcohol make a difference to our brains?

Researchers examined functional MRI brain scans from 36,678 healthy adults, aged 40-69 years, in the United Kingdom and compared those findings with their weekly alcohol consumption, adjusting for differences in age, sex, height, social and economic status, and country of residence, among other things.

In line with past studies, the researchers found that, as a person drank more alcohol, their gray-matter and white-matter volume decreased, getting worse the more drinks they had in a week.

But the researchers also noted that they could tell the difference between brain images of people who never drank alcohol and those who had just one or two drinks a day.

Going from 1 unit of alcohol to 2 – which in the United Kingdom means a full pint of beer or standard glass of wine – was linked to changes similar to 2 years of aging in the brain.

Other than comparing the changes with aging, it’s not yet clear what the findings mean until the scientists do more research, including looking at the genes of the people who took part in the study.

The study also has several drawbacks. The people who were studied are all middle-aged Europeans, so findings might be different in younger people or those with different ancestries. People also self-reported how much alcohol they drank for the past year, which they might not remember correctly or which might be different from previous years, including past years of heavy drinking.

And since the researchers compared drinking habits with brain imaging at one point in time, it’s not possible to say whether alcohol is actually causing the brain differences they saw.

Still, the findings raise the question of whether national guidelines should be revisited, and whether it’s better to cut that evening drink to a half-glass of wine instead.

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

It’s no secret that heavy drinking is linked to potential health problems, from liver damage to a higher risk of cancer. But most people probably wouldn’t think a nightcap every evening is much of a health threat.

Now, new evidence published in Nature Communications suggests even one drink a day is linked to detectable changes in the brain, though it’s not clear whether the alcohol is causing the differences.

Previous research has found that people with alcohol use disorder have structural changes in their brains, compared with healthy people’s brains, such as reduced gray-matter and white-matter volume.

But those findings were in people with a history of heavy drinking, defined by the National Institute on Alcohol Abuse and Alcoholism as more than four drinks a day for men and more than three drinks a day for women.

The national dietary guidelines from the U.S. Department of Health & Human Services advise drinking no more than two standard drinks for men and one drink for women each day. A standard drink in the United States is 12 ounces of beer, 5 ounces of wine, or 1½ ounce of liquor.

But could even this modest amount of alcohol make a difference to our brains?

Researchers examined functional MRI brain scans from 36,678 healthy adults, aged 40-69 years, in the United Kingdom and compared those findings with their weekly alcohol consumption, adjusting for differences in age, sex, height, social and economic status, and country of residence, among other things.

In line with past studies, the researchers found that, as a person drank more alcohol, their gray-matter and white-matter volume decreased, getting worse the more drinks they had in a week.

But the researchers also noted that they could tell the difference between brain images of people who never drank alcohol and those who had just one or two drinks a day.

Going from 1 unit of alcohol to 2 – which in the United Kingdom means a full pint of beer or standard glass of wine – was linked to changes similar to 2 years of aging in the brain.

Other than comparing the changes with aging, it’s not yet clear what the findings mean until the scientists do more research, including looking at the genes of the people who took part in the study.

The study also has several drawbacks. The people who were studied are all middle-aged Europeans, so findings might be different in younger people or those with different ancestries. People also self-reported how much alcohol they drank for the past year, which they might not remember correctly or which might be different from previous years, including past years of heavy drinking.

And since the researchers compared drinking habits with brain imaging at one point in time, it’s not possible to say whether alcohol is actually causing the brain differences they saw.

Still, the findings raise the question of whether national guidelines should be revisited, and whether it’s better to cut that evening drink to a half-glass of wine instead.

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

It’s no secret that heavy drinking is linked to potential health problems, from liver damage to a higher risk of cancer. But most people probably wouldn’t think a nightcap every evening is much of a health threat.

Now, new evidence published in Nature Communications suggests even one drink a day is linked to detectable changes in the brain, though it’s not clear whether the alcohol is causing the differences.

Previous research has found that people with alcohol use disorder have structural changes in their brains, compared with healthy people’s brains, such as reduced gray-matter and white-matter volume.

But those findings were in people with a history of heavy drinking, defined by the National Institute on Alcohol Abuse and Alcoholism as more than four drinks a day for men and more than three drinks a day for women.

The national dietary guidelines from the U.S. Department of Health & Human Services advise drinking no more than two standard drinks for men and one drink for women each day. A standard drink in the United States is 12 ounces of beer, 5 ounces of wine, or 1½ ounce of liquor.

But could even this modest amount of alcohol make a difference to our brains?

Researchers examined functional MRI brain scans from 36,678 healthy adults, aged 40-69 years, in the United Kingdom and compared those findings with their weekly alcohol consumption, adjusting for differences in age, sex, height, social and economic status, and country of residence, among other things.

In line with past studies, the researchers found that, as a person drank more alcohol, their gray-matter and white-matter volume decreased, getting worse the more drinks they had in a week.

But the researchers also noted that they could tell the difference between brain images of people who never drank alcohol and those who had just one or two drinks a day.

Going from 1 unit of alcohol to 2 – which in the United Kingdom means a full pint of beer or standard glass of wine – was linked to changes similar to 2 years of aging in the brain.

Other than comparing the changes with aging, it’s not yet clear what the findings mean until the scientists do more research, including looking at the genes of the people who took part in the study.

The study also has several drawbacks. The people who were studied are all middle-aged Europeans, so findings might be different in younger people or those with different ancestries. People also self-reported how much alcohol they drank for the past year, which they might not remember correctly or which might be different from previous years, including past years of heavy drinking.

And since the researchers compared drinking habits with brain imaging at one point in time, it’s not possible to say whether alcohol is actually causing the brain differences they saw.

Still, the findings raise the question of whether national guidelines should be revisited, and whether it’s better to cut that evening drink to a half-glass of wine instead.

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

The endocannabinoid system is a promising therapeutic target for the treatment of migraine, according to Italian researchers at the University of Pavia, and the C. Mondino National Institute of Neurology Foundation. “The complexity of the endocannabinoid system calls for accurate biochemical and pharmacological characterization of any new compounds undergoing testing and development,” noted Rosaria Greco, PhD. She and her colleagues authored a review on the topic that was published online Feb. 18, 2022, in Headache.

Although cannabis has been investigated for both the treatment and prevention of migraine, evidence for its benefit is weak because of lack of controlled studies, they explained. Archival data from a large database “showed greater improvements in men than in women and suggested that concentrated preparations were more effective than flower consumption.” In addition, a small single-center study linked nabilone, a synthetic cannabinoid, to reductions in pain duration, intensity, and daily intake of analgesics among patients with medication overuse headache. Finally, a pilot study reported a reduction in pain intensity among patients with chronic migraine treated with a combination of tested a combination of delta-9-tetrahydrocannabinol and cannabidiol. “Methodologically sound studies are now needed to investigate the possible effects of cannabis in migraine treatment and to define strains, formulations, and dosage,” they noted.
 

Not just cannabis

In addition to exogenous cannabis, there are now preclinical studies suggesting other compounds that interact with the endocannabinoid system “are also able to modulate the pathways involved in migraine-related pain,” the study authors wrote. “But the road ahead is still long. Multiple molecules linked to the endocannabinoid system have emerged as potential therapeutic targets.

The complexity of the system demands caution and precise biochemical and pharmacological characterization of the new compounds to be tested and developed.”

Among these compounds are endogenous ligands such as N-arachidonoylethanolamine (anandamide) and 2-arachidonoylglycerol that specifically target CB1 and CB2 receptors. Additionally, there are endocannabinoid-based drugs that also target the CB1/CB2 receptors, as well as other substances, such as lipids (palmitoylethanolamide [PEA]) and enzymes, that do not bind to the CB1/CB2 receptors but are responsible for endocannabinoid biosynthesis.

There is some evidence that the endocannabinoid system may be dysfunctional in patients with migraine, and the authors noted their work has shown that PEA plasma levels are increased during experimentally triggered migraine-like attacks. Thus, some preclinical and preliminary evidence suggests that administration of PEA or anandamide may have analgesic and anti-inflammatory effects in migraine.

Another approach is the inhibition of endocannabinoid catabolic enzymes, which could circumvent the adverse effects associated with direct activation of CB receptors. “Endocannabinoid tone enhancement has been proposed as an alternative modality of activation of CB receptors and is possibly devoid of the psychotropic effects reported with CB receptor agonists,” noted the authors, who have shown in animal and preclinical studies that inhibition of fatty acid amide hydrolase (FAAH) and monoacylglycerol lipase can modulate migraine pain.

Yet another way of indirectly impacting CB receptors is through their allosteric ligands, an approach that “deserves further investigation”, and “might provide interesting leads for clinical development, given that it may have a favorable side-effect profile with limited psychomimetic and depressant effects,” wrote the authors. And finally, inhibition of N-acylethanolamine acid amide hydrolase, the enzyme that preferentially hydrolyzes PEA, might be a promising approach.

“The multiplicity of options and the wealth of data already obtained in animal models underscore the importance of further advancing research in this area,” the authors concluded.
 

Patients are taking cannabinoids; physicians should learn about them

Commenting on the paper, Alan Rapaport, MD, clinical professor of neurology at the University of California, Los Angeles, said “this well-done paper points out the complexity of the endocannabinoid system and the multiple ways of getting it to work for certain patients. It details some of the studies that show beneficial results in migraine, medication overuse headache, chronic migraine, and pain. Patients with headache, other types of pain, anxiety, nausea, sleep issues, and other symptoms are already taking cannabinoids, usually derived from the marijuana plant, that are not well regulated. A few are prescribed drugs which target CB1 and CB2 receptors. Patients often get relief of some of their symptoms, sometimes getting high and many times not.

“The paper makes the point that previous studies are often small, not carefully controlled, or well documented. We do need to start doing larger, properly designed studies and getting them into the literature. Doctors need to learn more about these treatments. The next step will be to get [Food and Drug Administration]–approved treatments, so physicians and nurses will know exactly what we are giving, the beneficial effects to expect in a certain percentage of patients, and the adverse events to warn our patients about. Cannabinoids have been tried by a large percentage of patients with headache and pain. Now we need to standardize the various treatments that are sure to be suggested in the future.”

The study was funded by the Migraine Research Foundation, and the Italian Ministry of Health. The study authors declared no conflicts of interest.

The endocannabinoid system is a promising therapeutic target for the treatment of migraine, according to Italian researchers at the University of Pavia, and the C. Mondino National Institute of Neurology Foundation. “The complexity of the endocannabinoid system calls for accurate biochemical and pharmacological characterization of any new compounds undergoing testing and development,” noted Rosaria Greco, PhD. She and her colleagues authored a review on the topic that was published online Feb. 18, 2022, in Headache.

Although cannabis has been investigated for both the treatment and prevention of migraine, evidence for its benefit is weak because of lack of controlled studies, they explained. Archival data from a large database “showed greater improvements in men than in women and suggested that concentrated preparations were more effective than flower consumption.” In addition, a small single-center study linked nabilone, a synthetic cannabinoid, to reductions in pain duration, intensity, and daily intake of analgesics among patients with medication overuse headache. Finally, a pilot study reported a reduction in pain intensity among patients with chronic migraine treated with a combination of tested a combination of delta-9-tetrahydrocannabinol and cannabidiol. “Methodologically sound studies are now needed to investigate the possible effects of cannabis in migraine treatment and to define strains, formulations, and dosage,” they noted.
 

Not just cannabis

In addition to exogenous cannabis, there are now preclinical studies suggesting other compounds that interact with the endocannabinoid system “are also able to modulate the pathways involved in migraine-related pain,” the study authors wrote. “But the road ahead is still long. Multiple molecules linked to the endocannabinoid system have emerged as potential therapeutic targets.

The complexity of the system demands caution and precise biochemical and pharmacological characterization of the new compounds to be tested and developed.”

Among these compounds are endogenous ligands such as N-arachidonoylethanolamine (anandamide) and 2-arachidonoylglycerol that specifically target CB1 and CB2 receptors. Additionally, there are endocannabinoid-based drugs that also target the CB1/CB2 receptors, as well as other substances, such as lipids (palmitoylethanolamide [PEA]) and enzymes, that do not bind to the CB1/CB2 receptors but are responsible for endocannabinoid biosynthesis.

There is some evidence that the endocannabinoid system may be dysfunctional in patients with migraine, and the authors noted their work has shown that PEA plasma levels are increased during experimentally triggered migraine-like attacks. Thus, some preclinical and preliminary evidence suggests that administration of PEA or anandamide may have analgesic and anti-inflammatory effects in migraine.

Another approach is the inhibition of endocannabinoid catabolic enzymes, which could circumvent the adverse effects associated with direct activation of CB receptors. “Endocannabinoid tone enhancement has been proposed as an alternative modality of activation of CB receptors and is possibly devoid of the psychotropic effects reported with CB receptor agonists,” noted the authors, who have shown in animal and preclinical studies that inhibition of fatty acid amide hydrolase (FAAH) and monoacylglycerol lipase can modulate migraine pain.

Yet another way of indirectly impacting CB receptors is through their allosteric ligands, an approach that “deserves further investigation”, and “might provide interesting leads for clinical development, given that it may have a favorable side-effect profile with limited psychomimetic and depressant effects,” wrote the authors. And finally, inhibition of N-acylethanolamine acid amide hydrolase, the enzyme that preferentially hydrolyzes PEA, might be a promising approach.

“The multiplicity of options and the wealth of data already obtained in animal models underscore the importance of further advancing research in this area,” the authors concluded.
 

Patients are taking cannabinoids; physicians should learn about them

Commenting on the paper, Alan Rapaport, MD, clinical professor of neurology at the University of California, Los Angeles, said “this well-done paper points out the complexity of the endocannabinoid system and the multiple ways of getting it to work for certain patients. It details some of the studies that show beneficial results in migraine, medication overuse headache, chronic migraine, and pain. Patients with headache, other types of pain, anxiety, nausea, sleep issues, and other symptoms are already taking cannabinoids, usually derived from the marijuana plant, that are not well regulated. A few are prescribed drugs which target CB1 and CB2 receptors. Patients often get relief of some of their symptoms, sometimes getting high and many times not.

“The paper makes the point that previous studies are often small, not carefully controlled, or well documented. We do need to start doing larger, properly designed studies and getting them into the literature. Doctors need to learn more about these treatments. The next step will be to get [Food and Drug Administration]–approved treatments, so physicians and nurses will know exactly what we are giving, the beneficial effects to expect in a certain percentage of patients, and the adverse events to warn our patients about. Cannabinoids have been tried by a large percentage of patients with headache and pain. Now we need to standardize the various treatments that are sure to be suggested in the future.”

The study was funded by the Migraine Research Foundation, and the Italian Ministry of Health. The study authors declared no conflicts of interest.

The endocannabinoid system is a promising therapeutic target for the treatment of migraine, according to Italian researchers at the University of Pavia, and the C. Mondino National Institute of Neurology Foundation. “The complexity of the endocannabinoid system calls for accurate biochemical and pharmacological characterization of any new compounds undergoing testing and development,” noted Rosaria Greco, PhD. She and her colleagues authored a review on the topic that was published online Feb. 18, 2022, in Headache.

Although cannabis has been investigated for both the treatment and prevention of migraine, evidence for its benefit is weak because of lack of controlled studies, they explained. Archival data from a large database “showed greater improvements in men than in women and suggested that concentrated preparations were more effective than flower consumption.” In addition, a small single-center study linked nabilone, a synthetic cannabinoid, to reductions in pain duration, intensity, and daily intake of analgesics among patients with medication overuse headache. Finally, a pilot study reported a reduction in pain intensity among patients with chronic migraine treated with a combination of tested a combination of delta-9-tetrahydrocannabinol and cannabidiol. “Methodologically sound studies are now needed to investigate the possible effects of cannabis in migraine treatment and to define strains, formulations, and dosage,” they noted.
 

Not just cannabis

In addition to exogenous cannabis, there are now preclinical studies suggesting other compounds that interact with the endocannabinoid system “are also able to modulate the pathways involved in migraine-related pain,” the study authors wrote. “But the road ahead is still long. Multiple molecules linked to the endocannabinoid system have emerged as potential therapeutic targets.

The complexity of the system demands caution and precise biochemical and pharmacological characterization of the new compounds to be tested and developed.”

Among these compounds are endogenous ligands such as N-arachidonoylethanolamine (anandamide) and 2-arachidonoylglycerol that specifically target CB1 and CB2 receptors. Additionally, there are endocannabinoid-based drugs that also target the CB1/CB2 receptors, as well as other substances, such as lipids (palmitoylethanolamide [PEA]) and enzymes, that do not bind to the CB1/CB2 receptors but are responsible for endocannabinoid biosynthesis.

There is some evidence that the endocannabinoid system may be dysfunctional in patients with migraine, and the authors noted their work has shown that PEA plasma levels are increased during experimentally triggered migraine-like attacks. Thus, some preclinical and preliminary evidence suggests that administration of PEA or anandamide may have analgesic and anti-inflammatory effects in migraine.

Another approach is the inhibition of endocannabinoid catabolic enzymes, which could circumvent the adverse effects associated with direct activation of CB receptors. “Endocannabinoid tone enhancement has been proposed as an alternative modality of activation of CB receptors and is possibly devoid of the psychotropic effects reported with CB receptor agonists,” noted the authors, who have shown in animal and preclinical studies that inhibition of fatty acid amide hydrolase (FAAH) and monoacylglycerol lipase can modulate migraine pain.

Yet another way of indirectly impacting CB receptors is through their allosteric ligands, an approach that “deserves further investigation”, and “might provide interesting leads for clinical development, given that it may have a favorable side-effect profile with limited psychomimetic and depressant effects,” wrote the authors. And finally, inhibition of N-acylethanolamine acid amide hydrolase, the enzyme that preferentially hydrolyzes PEA, might be a promising approach.

“The multiplicity of options and the wealth of data already obtained in animal models underscore the importance of further advancing research in this area,” the authors concluded.
 

Patients are taking cannabinoids; physicians should learn about them

Commenting on the paper, Alan Rapaport, MD, clinical professor of neurology at the University of California, Los Angeles, said “this well-done paper points out the complexity of the endocannabinoid system and the multiple ways of getting it to work for certain patients. It details some of the studies that show beneficial results in migraine, medication overuse headache, chronic migraine, and pain. Patients with headache, other types of pain, anxiety, nausea, sleep issues, and other symptoms are already taking cannabinoids, usually derived from the marijuana plant, that are not well regulated. A few are prescribed drugs which target CB1 and CB2 receptors. Patients often get relief of some of their symptoms, sometimes getting high and many times not.

“The paper makes the point that previous studies are often small, not carefully controlled, or well documented. We do need to start doing larger, properly designed studies and getting them into the literature. Doctors need to learn more about these treatments. The next step will be to get [Food and Drug Administration]–approved treatments, so physicians and nurses will know exactly what we are giving, the beneficial effects to expect in a certain percentage of patients, and the adverse events to warn our patients about. Cannabinoids have been tried by a large percentage of patients with headache and pain. Now we need to standardize the various treatments that are sure to be suggested in the future.”

The study was funded by the Migraine Research Foundation, and the Italian Ministry of Health. The study authors declared no conflicts of interest.

Lack of contact with the outside world and an active lifestyle could play a role in why indigenous groups in the remote Amazon of Bolivia have some of the lowest rates of dementia in the world.   

What to know

• Only about 1% of members of the Tsimane and Moseten peoples of the Bolivian Amazon suffer from dementia, compared with 11% of people aged 65 and older in the United States.
• Underscoring the profound relationship between lifestyle and cognitive health, something about the preindustrial subsistence lifestyle of the groups appears to protect older tribe members from dementia.
• The rate of  generally accepted as typical in aging is comparable between the tribes and rates in developed countries such as the United States.
• The Tsimane and Moseten people remain very physically active throughout their lives by fishing, hunting, and farming and experience less brain atrophy than their American and European peers.
• Indigenous populations elsewhere in the world have been found to have high rates of dementia, which are attributed to more contact with their nonindigenous neighbors and adoption of their lifestyles.

--From staff reports

This is a summary of the article, “Study: Some of the world’s lowest rates of dementia found in Amazonian indigenous groups,” published by Alzheimer’s & Dementia: The Journal of the Alzheimer’s Association, on March 9, 2022. The full article can be found on news.ucsb.edu.



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

Lack of contact with the outside world and an active lifestyle could play a role in why indigenous groups in the remote Amazon of Bolivia have some of the lowest rates of dementia in the world.   

What to know

• Only about 1% of members of the Tsimane and Moseten peoples of the Bolivian Amazon suffer from dementia, compared with 11% of people aged 65 and older in the United States.
• Underscoring the profound relationship between lifestyle and cognitive health, something about the preindustrial subsistence lifestyle of the groups appears to protect older tribe members from dementia.
• The rate of  generally accepted as typical in aging is comparable between the tribes and rates in developed countries such as the United States.
• The Tsimane and Moseten people remain very physically active throughout their lives by fishing, hunting, and farming and experience less brain atrophy than their American and European peers.
• Indigenous populations elsewhere in the world have been found to have high rates of dementia, which are attributed to more contact with their nonindigenous neighbors and adoption of their lifestyles.

--From staff reports

This is a summary of the article, “Study: Some of the world’s lowest rates of dementia found in Amazonian indigenous groups,” published by Alzheimer’s & Dementia: The Journal of the Alzheimer’s Association, on March 9, 2022. The full article can be found on news.ucsb.edu.



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

Lack of contact with the outside world and an active lifestyle could play a role in why indigenous groups in the remote Amazon of Bolivia have some of the lowest rates of dementia in the world.   

What to know

• Only about 1% of members of the Tsimane and Moseten peoples of the Bolivian Amazon suffer from dementia, compared with 11% of people aged 65 and older in the United States.
• Underscoring the profound relationship between lifestyle and cognitive health, something about the preindustrial subsistence lifestyle of the groups appears to protect older tribe members from dementia.
• The rate of  generally accepted as typical in aging is comparable between the tribes and rates in developed countries such as the United States.
• The Tsimane and Moseten people remain very physically active throughout their lives by fishing, hunting, and farming and experience less brain atrophy than their American and European peers.
• Indigenous populations elsewhere in the world have been found to have high rates of dementia, which are attributed to more contact with their nonindigenous neighbors and adoption of their lifestyles.

--From staff reports

This is a summary of the article, “Study: Some of the world’s lowest rates of dementia found in Amazonian indigenous groups,” published by Alzheimer’s & Dementia: The Journal of the Alzheimer’s Association, on March 9, 2022. The full article can be found on news.ucsb.edu.



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

Patients who have a rare subtype of chronic lymphocytic leukemia/small lymphocytic lymphoma (CLL/SLL) with isolated Hodgkin/Reed–Sternberg-like cells (CLL-HRS) may benefit from Hodgkin-directed therapy, based on data from 46 individuals.

Those patients who progress to classic Hodgkin lymphoma (CHL) from CLL/SLL are generally diagnosed based on straightforward pathology and treated with HRS cells in the same way as patients with de novo CHL, wrote lead author Dr. Rebecca L. King, a pathologist at the Mayo Clinic in Rochester, Minn.

However, in a small subset of patients, HRS cells occur in a background of CLL/SLL, in a condition known as CLL-HRS, and these patients do not progress to overt CHL, the researchers wrote.

Given the rarity of CLL-HRS, data on patient management are limited, they noted.

In a retrospective study published in Blood Cancer Journal, researchers reviewed outcome data from 15 adults with CLL-HRS and 31 adults with CLL/SLL who had overtly transformed to CLL-HL. The median age of the participants at the time of CLL-HL or CLL-HRS transformation diagnosis was 72 years; 71% and 87% of the CLL-HL and CLL-HRS patients, respectively, were male.

The median times from CLL to CLL-HL transformation and from CLL to CLL-HRS transformation were 6.6 years and 4.9 years, respectively; the difference was not statistically significant. The phenotypic features of Reed-Sternberg cells and Epstein-Barr virus status were similar in both patient groups. Two patients had biopsies in which both CLL-HRS and CLL-HL were present in the same tissue at initial diagnosis; they were included in the CLL-HL group for clinical analysis and in both groups for pathology analysis.

The median overall survival of CLL-HRS patients was 17.5 months, compared with 33.5 months for CLL-HL patients (P = .24), a nonsignificant difference. However, patients with CLL-HRS who received Hodgkin-directed therapy had a significantly longer median overall survival, compared with those who received CLL-directed therapy (57 months vs. 8.4 months, P = .02).

CLL-directed therapy included rituximab with or without corticosteroids, chemoimmunotherapy, or acalabrutinib; HL-directed therapy included doxorubicin hydrochloride, bleomycin sulfate, vinblastine sulfate, and dacarbazine–based treatment; radiotherapy; or BCVPP (carmustine, cyclophosphamide, vinblastine, procarbazine, and prednisone).

Histopathology findings showed that CLL-HL patients had a background of mixed inflammation that was distinct from findings in CLL/SLL. CLL-HRS patients had a minimal inflammatory background, compared with CLL-HL cases, but researchers identified rosetting of T cells around the HRS cells in 56% of these patients.

“Our findings suggest that, clinically and pathologically, these patients show a spectrum of findings, and these two entities likely exist on a biologic continuum. Furthermore, our findings suggest that CLL-HRS patients managed with Hodgkin-directed therapy, rather than CLL-directed therapy, may have superior outcomes,” the researchers wrote.

The study findings were limited by several factors, including the retrospective design and the use of data from a single center. Therefore, the results should be validated in other cohorts, the researchers noted. In addition, the study participants were diagnosed over three decades, and management of the condition has significantly improved.

However, the results were strengthened by a review of data by three pathologists who were blinded to the clinical outcomes, they said.

“These findings have important implications for a scenario in which clinical guidelines are lacking and suggest that hematologists treating patients with CLL-HRS should consider HL-directed therapy,” the researchers concluded.

In an interview, Jennifer A. Woyach, MD, a hematologist at Ohio State University, Columbus, commented on the study findings: “Hodgkin transformation and CLL with Hodgkin-like cells likely represent a biologic continuum, and care should be taken to obtain adequate biopsies, so that the diagnosis of Hodgkin transformation can be made when appropriate.”

“Interestingly, the authors noted a trend toward improved survival when CLL with Hodgkin-like cells was treated with standard Hodgkin regimens,” said Dr. Woyach. “With the small patient numbers, this certainly cannot be a general recommendation, but should be considered by treating physicians on a case-by-case basis.”

“While we know that patients with Hodgkin transformation can in many cases be successfully treated with standard Hodgkin regimen, the natural history and optimal treatment for CLL with Hodgkin-like cells have been unknown. This analysis helps understand the biologic difference between these two clinicopathologic entities to understand how to better treat patients,” she noted. Going forward, “it would be extremely helpful to see these data validated by other centers to be sure that these results are reproducible,” Dr. Woyach added.

The study was supported by the Mayo Clinic, Rochester, Minn., and by the Henry J. Predolin Foundation. Lead author Dr. King disclosed research support to her institution from Bristol-Myers Squibb/Celgene. Dr. Woyach had no financial disclosures relevant to this study, but she has received laboratory research funding from Schrodinger and has consulted for AbbVie, Pharmacyclics, Janssen, AstraZeneca, Genentech, Beigene, Loxo, and Newave.
 

This article was updated 3/11/22.

Patients who have a rare subtype of chronic lymphocytic leukemia/small lymphocytic lymphoma (CLL/SLL) with isolated Hodgkin/Reed–Sternberg-like cells (CLL-HRS) may benefit from Hodgkin-directed therapy, based on data from 46 individuals.

Those patients who progress to classic Hodgkin lymphoma (CHL) from CLL/SLL are generally diagnosed based on straightforward pathology and treated with HRS cells in the same way as patients with de novo CHL, wrote lead author Dr. Rebecca L. King, a pathologist at the Mayo Clinic in Rochester, Minn.

However, in a small subset of patients, HRS cells occur in a background of CLL/SLL, in a condition known as CLL-HRS, and these patients do not progress to overt CHL, the researchers wrote.

Given the rarity of CLL-HRS, data on patient management are limited, they noted.

In a retrospective study published in Blood Cancer Journal, researchers reviewed outcome data from 15 adults with CLL-HRS and 31 adults with CLL/SLL who had overtly transformed to CLL-HL. The median age of the participants at the time of CLL-HL or CLL-HRS transformation diagnosis was 72 years; 71% and 87% of the CLL-HL and CLL-HRS patients, respectively, were male.

The median times from CLL to CLL-HL transformation and from CLL to CLL-HRS transformation were 6.6 years and 4.9 years, respectively; the difference was not statistically significant. The phenotypic features of Reed-Sternberg cells and Epstein-Barr virus status were similar in both patient groups. Two patients had biopsies in which both CLL-HRS and CLL-HL were present in the same tissue at initial diagnosis; they were included in the CLL-HL group for clinical analysis and in both groups for pathology analysis.

The median overall survival of CLL-HRS patients was 17.5 months, compared with 33.5 months for CLL-HL patients (P = .24), a nonsignificant difference. However, patients with CLL-HRS who received Hodgkin-directed therapy had a significantly longer median overall survival, compared with those who received CLL-directed therapy (57 months vs. 8.4 months, P = .02).

CLL-directed therapy included rituximab with or without corticosteroids, chemoimmunotherapy, or acalabrutinib; HL-directed therapy included doxorubicin hydrochloride, bleomycin sulfate, vinblastine sulfate, and dacarbazine–based treatment; radiotherapy; or BCVPP (carmustine, cyclophosphamide, vinblastine, procarbazine, and prednisone).

Histopathology findings showed that CLL-HL patients had a background of mixed inflammation that was distinct from findings in CLL/SLL. CLL-HRS patients had a minimal inflammatory background, compared with CLL-HL cases, but researchers identified rosetting of T cells around the HRS cells in 56% of these patients.

“Our findings suggest that, clinically and pathologically, these patients show a spectrum of findings, and these two entities likely exist on a biologic continuum. Furthermore, our findings suggest that CLL-HRS patients managed with Hodgkin-directed therapy, rather than CLL-directed therapy, may have superior outcomes,” the researchers wrote.

The study findings were limited by several factors, including the retrospective design and the use of data from a single center. Therefore, the results should be validated in other cohorts, the researchers noted. In addition, the study participants were diagnosed over three decades, and management of the condition has significantly improved.

However, the results were strengthened by a review of data by three pathologists who were blinded to the clinical outcomes, they said.

“These findings have important implications for a scenario in which clinical guidelines are lacking and suggest that hematologists treating patients with CLL-HRS should consider HL-directed therapy,” the researchers concluded.

In an interview, Jennifer A. Woyach, MD, a hematologist at Ohio State University, Columbus, commented on the study findings: “Hodgkin transformation and CLL with Hodgkin-like cells likely represent a biologic continuum, and care should be taken to obtain adequate biopsies, so that the diagnosis of Hodgkin transformation can be made when appropriate.”

“Interestingly, the authors noted a trend toward improved survival when CLL with Hodgkin-like cells was treated with standard Hodgkin regimens,” said Dr. Woyach. “With the small patient numbers, this certainly cannot be a general recommendation, but should be considered by treating physicians on a case-by-case basis.”

“While we know that patients with Hodgkin transformation can in many cases be successfully treated with standard Hodgkin regimen, the natural history and optimal treatment for CLL with Hodgkin-like cells have been unknown. This analysis helps understand the biologic difference between these two clinicopathologic entities to understand how to better treat patients,” she noted. Going forward, “it would be extremely helpful to see these data validated by other centers to be sure that these results are reproducible,” Dr. Woyach added.

The study was supported by the Mayo Clinic, Rochester, Minn., and by the Henry J. Predolin Foundation. Lead author Dr. King disclosed research support to her institution from Bristol-Myers Squibb/Celgene. Dr. Woyach had no financial disclosures relevant to this study, but she has received laboratory research funding from Schrodinger and has consulted for AbbVie, Pharmacyclics, Janssen, AstraZeneca, Genentech, Beigene, Loxo, and Newave.
 

This article was updated 3/11/22.

Patients who have a rare subtype of chronic lymphocytic leukemia/small lymphocytic lymphoma (CLL/SLL) with isolated Hodgkin/Reed–Sternberg-like cells (CLL-HRS) may benefit from Hodgkin-directed therapy, based on data from 46 individuals.

Those patients who progress to classic Hodgkin lymphoma (CHL) from CLL/SLL are generally diagnosed based on straightforward pathology and treated with HRS cells in the same way as patients with de novo CHL, wrote lead author Dr. Rebecca L. King, a pathologist at the Mayo Clinic in Rochester, Minn.

However, in a small subset of patients, HRS cells occur in a background of CLL/SLL, in a condition known as CLL-HRS, and these patients do not progress to overt CHL, the researchers wrote.

Given the rarity of CLL-HRS, data on patient management are limited, they noted.

In a retrospective study published in Blood Cancer Journal, researchers reviewed outcome data from 15 adults with CLL-HRS and 31 adults with CLL/SLL who had overtly transformed to CLL-HL. The median age of the participants at the time of CLL-HL or CLL-HRS transformation diagnosis was 72 years; 71% and 87% of the CLL-HL and CLL-HRS patients, respectively, were male.

The median times from CLL to CLL-HL transformation and from CLL to CLL-HRS transformation were 6.6 years and 4.9 years, respectively; the difference was not statistically significant. The phenotypic features of Reed-Sternberg cells and Epstein-Barr virus status were similar in both patient groups. Two patients had biopsies in which both CLL-HRS and CLL-HL were present in the same tissue at initial diagnosis; they were included in the CLL-HL group for clinical analysis and in both groups for pathology analysis.

The median overall survival of CLL-HRS patients was 17.5 months, compared with 33.5 months for CLL-HL patients (P = .24), a nonsignificant difference. However, patients with CLL-HRS who received Hodgkin-directed therapy had a significantly longer median overall survival, compared with those who received CLL-directed therapy (57 months vs. 8.4 months, P = .02).

CLL-directed therapy included rituximab with or without corticosteroids, chemoimmunotherapy, or acalabrutinib; HL-directed therapy included doxorubicin hydrochloride, bleomycin sulfate, vinblastine sulfate, and dacarbazine–based treatment; radiotherapy; or BCVPP (carmustine, cyclophosphamide, vinblastine, procarbazine, and prednisone).

Histopathology findings showed that CLL-HL patients had a background of mixed inflammation that was distinct from findings in CLL/SLL. CLL-HRS patients had a minimal inflammatory background, compared with CLL-HL cases, but researchers identified rosetting of T cells around the HRS cells in 56% of these patients.

“Our findings suggest that, clinically and pathologically, these patients show a spectrum of findings, and these two entities likely exist on a biologic continuum. Furthermore, our findings suggest that CLL-HRS patients managed with Hodgkin-directed therapy, rather than CLL-directed therapy, may have superior outcomes,” the researchers wrote.

The study findings were limited by several factors, including the retrospective design and the use of data from a single center. Therefore, the results should be validated in other cohorts, the researchers noted. In addition, the study participants were diagnosed over three decades, and management of the condition has significantly improved.

However, the results were strengthened by a review of data by three pathologists who were blinded to the clinical outcomes, they said.

“These findings have important implications for a scenario in which clinical guidelines are lacking and suggest that hematologists treating patients with CLL-HRS should consider HL-directed therapy,” the researchers concluded.

In an interview, Jennifer A. Woyach, MD, a hematologist at Ohio State University, Columbus, commented on the study findings: “Hodgkin transformation and CLL with Hodgkin-like cells likely represent a biologic continuum, and care should be taken to obtain adequate biopsies, so that the diagnosis of Hodgkin transformation can be made when appropriate.”

“Interestingly, the authors noted a trend toward improved survival when CLL with Hodgkin-like cells was treated with standard Hodgkin regimens,” said Dr. Woyach. “With the small patient numbers, this certainly cannot be a general recommendation, but should be considered by treating physicians on a case-by-case basis.”

“While we know that patients with Hodgkin transformation can in many cases be successfully treated with standard Hodgkin regimen, the natural history and optimal treatment for CLL with Hodgkin-like cells have been unknown. This analysis helps understand the biologic difference between these two clinicopathologic entities to understand how to better treat patients,” she noted. Going forward, “it would be extremely helpful to see these data validated by other centers to be sure that these results are reproducible,” Dr. Woyach added.

The study was supported by the Mayo Clinic, Rochester, Minn., and by the Henry J. Predolin Foundation. Lead author Dr. King disclosed research support to her institution from Bristol-Myers Squibb/Celgene. Dr. Woyach had no financial disclosures relevant to this study, but she has received laboratory research funding from Schrodinger and has consulted for AbbVie, Pharmacyclics, Janssen, AstraZeneca, Genentech, Beigene, Loxo, and Newave.
 

This article was updated 3/11/22.

Even mild cases of COVID-19 are associated with brain changes, including decreased gray matter, an overall reduction in brain volume, and cognitive decline, a new imaging study shows.

In the first study to use magnetic resonance brain imaging, before and after COVID-19, investigators found “greater reduction in grey matter thickness and tissue-contrast in the orbitofrontal cortex and parahippocampal gyrus, greater changes in markers of tissue damage in regions functionally connected to the primary olfactory cortex and greater reduction in global brain size.” However, the researchers urge caution when interpreting the findings.

Gwenaëlle Douaud, PhD, Wellcome Center for Integrative Neuroimaging, Nuffield Department of Clinical Neurosciences, University of Oxford, England, and colleagues describe these brain changes as “modest.”

“Whether these abnormal changes are the hallmark of the spread of the pathogenic effects in the brain, or of the virus itself, and whether these may prefigure a future vulnerability of the limbic system in particular, including memory, for these participants, remains to be investigated,” the researchers wrote.

The findings were published online March 7 in the journal Nature.
 

Gray matter loss

The investigators analyzed data from the UK Biobank, a large-scale biomedical database with genetic and health information for about 500,000 individuals living in the UK. They identified 785 adults aged 51-81 years who had undergone two brain MRIs about 3 years apart. Of these, 401 tested positive for SARS-CoV-2 before the second scan.

Participants also completed cognitive tests at the time of both scans.

Biobank centers use identical MRI scans and scanning methods, including six types of MRI scans, to image distinct regions of the brain and brain function. Results showed that although some loss of gray matter over time is normal, individuals who were infected with SARS-CoV-2 showed a 0.2% to 2% brain tissue loss in the parahippocampal gyrus, the orbitofrontal cortex, and the insula – all of which are largely involved in the sense of smell.

Participants who had contracted COVID-19 also showed a greater reduction in overall brain volume and a decrease in cognitive function.

Most of those with COVID-19 had only mild or moderate symptoms. However, the findings held even after the researchers excluded patients who had been hospitalized.
 

More research needed

“These findings might help explain why some people experience brain symptoms long after the acute infection,” Max Taquet, PhD, National Institute for Health Research Oxford Health BRC senior research fellow, University of Oxford, said in a press release.

Dr. Taquet, who was not a part of the study, noted the causes of these brain changes remain to be determined. Questions remain as to “whether they can be prevented or even reverted, as well as whether similar changes are observed in hospitalized patients,” children, younger adults, and minority groups.

“It is possible that these brain changes are not caused by COVID-19 but represent the natural progression of a disease that itself increased the risk of COVID-19,” Dr. Taquet said.

Other experts expressed concern over the findings and emphasized the need for more research.

“I am very concerned by the alarming use of language in the report with terms such as ‘neurodegenerative,’ “ Alan Carson, MD, professor of neuropsychiatry at the Center for Clinical Brain Sciences at the University of Edinburgh, Scotland, said in a press release. “The size and magnitude of brain changes found is very modest and such changes can be caused by a simple change in mental experience,” Dr. Carson said.

“What this study almost certainly shows is the impact, in terms of neural changes, of being disconnected from one’s sense of smell,” he added.

The study was funded by the Wellcome Trust Collaborative. Full financial conflict information for the study authors is included in the original article. Dr. Taquet has collaborated previously with some of the investigators.

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

Even mild cases of COVID-19 are associated with brain changes, including decreased gray matter, an overall reduction in brain volume, and cognitive decline, a new imaging study shows.

In the first study to use magnetic resonance brain imaging, before and after COVID-19, investigators found “greater reduction in grey matter thickness and tissue-contrast in the orbitofrontal cortex and parahippocampal gyrus, greater changes in markers of tissue damage in regions functionally connected to the primary olfactory cortex and greater reduction in global brain size.” However, the researchers urge caution when interpreting the findings.

Gwenaëlle Douaud, PhD, Wellcome Center for Integrative Neuroimaging, Nuffield Department of Clinical Neurosciences, University of Oxford, England, and colleagues describe these brain changes as “modest.”

“Whether these abnormal changes are the hallmark of the spread of the pathogenic effects in the brain, or of the virus itself, and whether these may prefigure a future vulnerability of the limbic system in particular, including memory, for these participants, remains to be investigated,” the researchers wrote.

The findings were published online March 7 in the journal Nature.
 

Gray matter loss

The investigators analyzed data from the UK Biobank, a large-scale biomedical database with genetic and health information for about 500,000 individuals living in the UK. They identified 785 adults aged 51-81 years who had undergone two brain MRIs about 3 years apart. Of these, 401 tested positive for SARS-CoV-2 before the second scan.

Participants also completed cognitive tests at the time of both scans.

Biobank centers use identical MRI scans and scanning methods, including six types of MRI scans, to image distinct regions of the brain and brain function. Results showed that although some loss of gray matter over time is normal, individuals who were infected with SARS-CoV-2 showed a 0.2% to 2% brain tissue loss in the parahippocampal gyrus, the orbitofrontal cortex, and the insula – all of which are largely involved in the sense of smell.

Participants who had contracted COVID-19 also showed a greater reduction in overall brain volume and a decrease in cognitive function.

Most of those with COVID-19 had only mild or moderate symptoms. However, the findings held even after the researchers excluded patients who had been hospitalized.
 

More research needed

“These findings might help explain why some people experience brain symptoms long after the acute infection,” Max Taquet, PhD, National Institute for Health Research Oxford Health BRC senior research fellow, University of Oxford, said in a press release.

Dr. Taquet, who was not a part of the study, noted the causes of these brain changes remain to be determined. Questions remain as to “whether they can be prevented or even reverted, as well as whether similar changes are observed in hospitalized patients,” children, younger adults, and minority groups.

“It is possible that these brain changes are not caused by COVID-19 but represent the natural progression of a disease that itself increased the risk of COVID-19,” Dr. Taquet said.

Other experts expressed concern over the findings and emphasized the need for more research.

“I am very concerned by the alarming use of language in the report with terms such as ‘neurodegenerative,’ “ Alan Carson, MD, professor of neuropsychiatry at the Center for Clinical Brain Sciences at the University of Edinburgh, Scotland, said in a press release. “The size and magnitude of brain changes found is very modest and such changes can be caused by a simple change in mental experience,” Dr. Carson said.

“What this study almost certainly shows is the impact, in terms of neural changes, of being disconnected from one’s sense of smell,” he added.

The study was funded by the Wellcome Trust Collaborative. Full financial conflict information for the study authors is included in the original article. Dr. Taquet has collaborated previously with some of the investigators.

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

Even mild cases of COVID-19 are associated with brain changes, including decreased gray matter, an overall reduction in brain volume, and cognitive decline, a new imaging study shows.

In the first study to use magnetic resonance brain imaging, before and after COVID-19, investigators found “greater reduction in grey matter thickness and tissue-contrast in the orbitofrontal cortex and parahippocampal gyrus, greater changes in markers of tissue damage in regions functionally connected to the primary olfactory cortex and greater reduction in global brain size.” However, the researchers urge caution when interpreting the findings.

Gwenaëlle Douaud, PhD, Wellcome Center for Integrative Neuroimaging, Nuffield Department of Clinical Neurosciences, University of Oxford, England, and colleagues describe these brain changes as “modest.”

“Whether these abnormal changes are the hallmark of the spread of the pathogenic effects in the brain, or of the virus itself, and whether these may prefigure a future vulnerability of the limbic system in particular, including memory, for these participants, remains to be investigated,” the researchers wrote.

The findings were published online March 7 in the journal Nature.
 

Gray matter loss

The investigators analyzed data from the UK Biobank, a large-scale biomedical database with genetic and health information for about 500,000 individuals living in the UK. They identified 785 adults aged 51-81 years who had undergone two brain MRIs about 3 years apart. Of these, 401 tested positive for SARS-CoV-2 before the second scan.

Participants also completed cognitive tests at the time of both scans.

Biobank centers use identical MRI scans and scanning methods, including six types of MRI scans, to image distinct regions of the brain and brain function. Results showed that although some loss of gray matter over time is normal, individuals who were infected with SARS-CoV-2 showed a 0.2% to 2% brain tissue loss in the parahippocampal gyrus, the orbitofrontal cortex, and the insula – all of which are largely involved in the sense of smell.

Participants who had contracted COVID-19 also showed a greater reduction in overall brain volume and a decrease in cognitive function.

Most of those with COVID-19 had only mild or moderate symptoms. However, the findings held even after the researchers excluded patients who had been hospitalized.
 

More research needed

“These findings might help explain why some people experience brain symptoms long after the acute infection,” Max Taquet, PhD, National Institute for Health Research Oxford Health BRC senior research fellow, University of Oxford, said in a press release.

Dr. Taquet, who was not a part of the study, noted the causes of these brain changes remain to be determined. Questions remain as to “whether they can be prevented or even reverted, as well as whether similar changes are observed in hospitalized patients,” children, younger adults, and minority groups.

“It is possible that these brain changes are not caused by COVID-19 but represent the natural progression of a disease that itself increased the risk of COVID-19,” Dr. Taquet said.

Other experts expressed concern over the findings and emphasized the need for more research.

“I am very concerned by the alarming use of language in the report with terms such as ‘neurodegenerative,’ “ Alan Carson, MD, professor of neuropsychiatry at the Center for Clinical Brain Sciences at the University of Edinburgh, Scotland, said in a press release. “The size and magnitude of brain changes found is very modest and such changes can be caused by a simple change in mental experience,” Dr. Carson said.

“What this study almost certainly shows is the impact, in terms of neural changes, of being disconnected from one’s sense of smell,” he added.

The study was funded by the Wellcome Trust Collaborative. Full financial conflict information for the study authors is included in the original article. Dr. Taquet has collaborated previously with some of the investigators.

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

A high-fiber diet, especially one rich in soluble fiber, is linked to a lower risk of incident disabling dementia, new research shows.

Investigators administered a dietary survey to 3,700 healthy adults at midlife and then followed them for up to 20 years. They found that participants who consumed the most fiber had approximately a 25% lower risk of developing dementia in later life.

“This study showed that people with a high intake of dietary fiber, especially soluble fiber, have a lower risk of dementia,” study investigator Kazumasa Yamagishi, MD, PhD, professor, department of public health medicine, faculty of medicine and health, Services Research and Development Center, University of Tsukuba, Japan, said in an interview.

CDC/Debora Cartagena

“There are still many unknowns about the causes of dementia, and it is not appropriate to determine causality based on the results of a single cohort study. However, the results of this study can be said to be one of the findings that will lead to the prevention of dementia,” Dr. Yamagishi said.

The study was published online Feb. 6 in Nutritional Neuroscience.
 

Brain-gut interaction

Brain-gut interaction has recently received attention for its potential involvement in the development of dementia. “The concept of brain-gut interaction emerged from the idea that the central nervous system communicates bidirectionally with the gastrointestinal tract, suggesting that the gut microbiome may influence brain plasticity and cognitive function,” the authors wrote.

A diet high in soluble fiber attenuates neuroinflammation in mouse models. Other animal studies have suggested that insoluble fiber might also have a beneficial effect on the microbiome.

The researchers wanted to see whether dietary fiber intake – especially soluble fiber – is associated with a reduced risk of dementia. They also investigated whether there was any difference between dementia in patients with vs. without a history of stroke.

In a previous study, these same researchers reported an inverse association between eating beans, which are high in fiber, and risk of disabling dementia. In the current study, the researchers extended the analyses to dietary fiber intake of total, soluble, and insoluble fibers, as well as other fiber-containing foods, such potatoes, vegetables, and fruits. However, they distinguished potatoes from other vegetables because the composition of starch in potatoes differs.

“Dietary fiber is a nutrient found in grains, potatoes, vegetables, and fruits and is known to affect intestinal bacteria,” Dr. Yamagishi said. “Recently, some experimental studies have shown that intestinal bacteria may be involved in cognitive functions as well as diseases of the digestive tract. However, there have been no studies that have actually examined the relationship between dietary fiber intake and the subsequent risk of dementia in large numbers of general people.”

The researchers turned to participants in the Circulatory Risk in Communities Study (CIRCS), an ongoing dynamic community cohort study involving five communities in Japan. The current study focused on communities where disabling dementia surveillance is conducted.

Participants (n = 3,739) ranged in age from 40 to 64 years (mean age, 51 years) at the time they completed the 24-hour dietary recall survey, and they participated in annual health checkups from 1985 to 1999. Potential risk factors for disabling dementia were measured at the time the dietary surveys were conducted. Participants were then followed for a median of 19.7 years (1999-2020) to confirm incident, disabling dementia.

“Disabling dementia” was defined as dementia that required care under the National Long-Term Care Insurance System and was further categorized on the basis of having a history or not having a history of stroke.

The researchers divided participants into quartiles, based on the amount of total, soluble, and insoluble intake reported in their surveys. They found that men tended to consume less total fiber compared to women.
 

Unclear mechanism

During follow-up, 670 participants developed disabling dementia.

Total fiber intake was “inversely and linearly” associated with risk of incident dementia, the authors reported, with each successive quartile associated with a lower risk compared to the lowest quartile (P for trend = .03).

The association remained after adjustment for potential factors that might affect dementia onset, such as body mass index, systolic blood pressure, antihypertensive medication use, serum total cholesterol, cholesterol-lowering medication, and diabetes (P for trend = .05).

“The inverse association was more evident for soluble fiber intake and was confined to dementia without a history of stroke,” the authors reported. Moreover, potatoes, not vegetables or fruits, showed a similar association.

“The mechanisms are currently unknown but might involve the interactions that take place between the gut and the brain,” Dr. Yamagishi said in a release.

“One possibility is that soluble fiber regulates the composition of gut bacteria. This composition may affect neuroinflammation, which plays a role in the onset of dementia,” he suggested. “It’s also possible that dietary fiber may reduce other risk factors for dementia, such as body weight, blood pressure, lipids, and glucose levels.”

The authors noted several limitations. For example, they did not distinguish between Alzheimer’s and non-Alzheimer’s dementia. Moreover, they classified dietary habits on the basis of a single survey, and participants’ dietary patterns might have changed over the study period.

In addition, Dr. Yamagishi noted, it is “important to confirm the association in other populations.”
 

Balance is key

In an interview, Uma Naidoo, MD, director of nutritional and lifestyle psychiatry, Massachusetts General Hospital, and nutrition educator at Harvard Medical School, both in Boston, said the study “adds to the growing pool of evidence suggesting that a diet rich in colorful, plant-based foods can benefit our neurological and psychiatric health, especially as we age.”

Dr. Naidoo, a chef and the author of “This Is Your Brain on Food,” who was not involved in the study, continued, “In nutritional psychiatry, balance is key and therefore consuming a well-rounded diet including ample amounts of fiber – particularly from sources like steel-cut oats, beans, lentils, and numerous other fruits and vegetables – can be part of a healthy lifestyle and prevention against cognitive decline in later years.

“While the study authors admit to limitations within the study, in my opinion, eating healthier has so many mental and physical health benefits that it’s a nutritional psychiatry no-brainer,” she added.

The study was partly supported by Health and Labour Science Research Grants for Dementia from the Ministry of Health, Labour and Welfare of Japan; JSPS Kakenhi; FULLHAP; and the Osaka University International Joint Research Promotion Programme with University College London. The authors and Dr. Naidoo report no relevant financial relationships.

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

A high-fiber diet, especially one rich in soluble fiber, is linked to a lower risk of incident disabling dementia, new research shows.

Investigators administered a dietary survey to 3,700 healthy adults at midlife and then followed them for up to 20 years. They found that participants who consumed the most fiber had approximately a 25% lower risk of developing dementia in later life.

“This study showed that people with a high intake of dietary fiber, especially soluble fiber, have a lower risk of dementia,” study investigator Kazumasa Yamagishi, MD, PhD, professor, department of public health medicine, faculty of medicine and health, Services Research and Development Center, University of Tsukuba, Japan, said in an interview.

CDC/Debora Cartagena

“There are still many unknowns about the causes of dementia, and it is not appropriate to determine causality based on the results of a single cohort study. However, the results of this study can be said to be one of the findings that will lead to the prevention of dementia,” Dr. Yamagishi said.

The study was published online Feb. 6 in Nutritional Neuroscience.
 

Brain-gut interaction

Brain-gut interaction has recently received attention for its potential involvement in the development of dementia. “The concept of brain-gut interaction emerged from the idea that the central nervous system communicates bidirectionally with the gastrointestinal tract, suggesting that the gut microbiome may influence brain plasticity and cognitive function,” the authors wrote.

A diet high in soluble fiber attenuates neuroinflammation in mouse models. Other animal studies have suggested that insoluble fiber might also have a beneficial effect on the microbiome.

The researchers wanted to see whether dietary fiber intake – especially soluble fiber – is associated with a reduced risk of dementia. They also investigated whether there was any difference between dementia in patients with vs. without a history of stroke.

In a previous study, these same researchers reported an inverse association between eating beans, which are high in fiber, and risk of disabling dementia. In the current study, the researchers extended the analyses to dietary fiber intake of total, soluble, and insoluble fibers, as well as other fiber-containing foods, such potatoes, vegetables, and fruits. However, they distinguished potatoes from other vegetables because the composition of starch in potatoes differs.

“Dietary fiber is a nutrient found in grains, potatoes, vegetables, and fruits and is known to affect intestinal bacteria,” Dr. Yamagishi said. “Recently, some experimental studies have shown that intestinal bacteria may be involved in cognitive functions as well as diseases of the digestive tract. However, there have been no studies that have actually examined the relationship between dietary fiber intake and the subsequent risk of dementia in large numbers of general people.”

The researchers turned to participants in the Circulatory Risk in Communities Study (CIRCS), an ongoing dynamic community cohort study involving five communities in Japan. The current study focused on communities where disabling dementia surveillance is conducted.

Participants (n = 3,739) ranged in age from 40 to 64 years (mean age, 51 years) at the time they completed the 24-hour dietary recall survey, and they participated in annual health checkups from 1985 to 1999. Potential risk factors for disabling dementia were measured at the time the dietary surveys were conducted. Participants were then followed for a median of 19.7 years (1999-2020) to confirm incident, disabling dementia.

“Disabling dementia” was defined as dementia that required care under the National Long-Term Care Insurance System and was further categorized on the basis of having a history or not having a history of stroke.

The researchers divided participants into quartiles, based on the amount of total, soluble, and insoluble intake reported in their surveys. They found that men tended to consume less total fiber compared to women.
 

Unclear mechanism

During follow-up, 670 participants developed disabling dementia.

Total fiber intake was “inversely and linearly” associated with risk of incident dementia, the authors reported, with each successive quartile associated with a lower risk compared to the lowest quartile (P for trend = .03).

The association remained after adjustment for potential factors that might affect dementia onset, such as body mass index, systolic blood pressure, antihypertensive medication use, serum total cholesterol, cholesterol-lowering medication, and diabetes (P for trend = .05).

“The inverse association was more evident for soluble fiber intake and was confined to dementia without a history of stroke,” the authors reported. Moreover, potatoes, not vegetables or fruits, showed a similar association.

“The mechanisms are currently unknown but might involve the interactions that take place between the gut and the brain,” Dr. Yamagishi said in a release.

“One possibility is that soluble fiber regulates the composition of gut bacteria. This composition may affect neuroinflammation, which plays a role in the onset of dementia,” he suggested. “It’s also possible that dietary fiber may reduce other risk factors for dementia, such as body weight, blood pressure, lipids, and glucose levels.”

The authors noted several limitations. For example, they did not distinguish between Alzheimer’s and non-Alzheimer’s dementia. Moreover, they classified dietary habits on the basis of a single survey, and participants’ dietary patterns might have changed over the study period.

In addition, Dr. Yamagishi noted, it is “important to confirm the association in other populations.”
 

Balance is key

In an interview, Uma Naidoo, MD, director of nutritional and lifestyle psychiatry, Massachusetts General Hospital, and nutrition educator at Harvard Medical School, both in Boston, said the study “adds to the growing pool of evidence suggesting that a diet rich in colorful, plant-based foods can benefit our neurological and psychiatric health, especially as we age.”

Dr. Naidoo, a chef and the author of “This Is Your Brain on Food,” who was not involved in the study, continued, “In nutritional psychiatry, balance is key and therefore consuming a well-rounded diet including ample amounts of fiber – particularly from sources like steel-cut oats, beans, lentils, and numerous other fruits and vegetables – can be part of a healthy lifestyle and prevention against cognitive decline in later years.

“While the study authors admit to limitations within the study, in my opinion, eating healthier has so many mental and physical health benefits that it’s a nutritional psychiatry no-brainer,” she added.

The study was partly supported by Health and Labour Science Research Grants for Dementia from the Ministry of Health, Labour and Welfare of Japan; JSPS Kakenhi; FULLHAP; and the Osaka University International Joint Research Promotion Programme with University College London. The authors and Dr. Naidoo report no relevant financial relationships.

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

A high-fiber diet, especially one rich in soluble fiber, is linked to a lower risk of incident disabling dementia, new research shows.

Investigators administered a dietary survey to 3,700 healthy adults at midlife and then followed them for up to 20 years. They found that participants who consumed the most fiber had approximately a 25% lower risk of developing dementia in later life.

“This study showed that people with a high intake of dietary fiber, especially soluble fiber, have a lower risk of dementia,” study investigator Kazumasa Yamagishi, MD, PhD, professor, department of public health medicine, faculty of medicine and health, Services Research and Development Center, University of Tsukuba, Japan, said in an interview.

CDC/Debora Cartagena

“There are still many unknowns about the causes of dementia, and it is not appropriate to determine causality based on the results of a single cohort study. However, the results of this study can be said to be one of the findings that will lead to the prevention of dementia,” Dr. Yamagishi said.

The study was published online Feb. 6 in Nutritional Neuroscience.
 

Brain-gut interaction

Brain-gut interaction has recently received attention for its potential involvement in the development of dementia. “The concept of brain-gut interaction emerged from the idea that the central nervous system communicates bidirectionally with the gastrointestinal tract, suggesting that the gut microbiome may influence brain plasticity and cognitive function,” the authors wrote.

A diet high in soluble fiber attenuates neuroinflammation in mouse models. Other animal studies have suggested that insoluble fiber might also have a beneficial effect on the microbiome.

The researchers wanted to see whether dietary fiber intake – especially soluble fiber – is associated with a reduced risk of dementia. They also investigated whether there was any difference between dementia in patients with vs. without a history of stroke.

In a previous study, these same researchers reported an inverse association between eating beans, which are high in fiber, and risk of disabling dementia. In the current study, the researchers extended the analyses to dietary fiber intake of total, soluble, and insoluble fibers, as well as other fiber-containing foods, such potatoes, vegetables, and fruits. However, they distinguished potatoes from other vegetables because the composition of starch in potatoes differs.

“Dietary fiber is a nutrient found in grains, potatoes, vegetables, and fruits and is known to affect intestinal bacteria,” Dr. Yamagishi said. “Recently, some experimental studies have shown that intestinal bacteria may be involved in cognitive functions as well as diseases of the digestive tract. However, there have been no studies that have actually examined the relationship between dietary fiber intake and the subsequent risk of dementia in large numbers of general people.”

The researchers turned to participants in the Circulatory Risk in Communities Study (CIRCS), an ongoing dynamic community cohort study involving five communities in Japan. The current study focused on communities where disabling dementia surveillance is conducted.

Participants (n = 3,739) ranged in age from 40 to 64 years (mean age, 51 years) at the time they completed the 24-hour dietary recall survey, and they participated in annual health checkups from 1985 to 1999. Potential risk factors for disabling dementia were measured at the time the dietary surveys were conducted. Participants were then followed for a median of 19.7 years (1999-2020) to confirm incident, disabling dementia.

“Disabling dementia” was defined as dementia that required care under the National Long-Term Care Insurance System and was further categorized on the basis of having a history or not having a history of stroke.

The researchers divided participants into quartiles, based on the amount of total, soluble, and insoluble intake reported in their surveys. They found that men tended to consume less total fiber compared to women.
 

Unclear mechanism

During follow-up, 670 participants developed disabling dementia.

Total fiber intake was “inversely and linearly” associated with risk of incident dementia, the authors reported, with each successive quartile associated with a lower risk compared to the lowest quartile (P for trend = .03).

The association remained after adjustment for potential factors that might affect dementia onset, such as body mass index, systolic blood pressure, antihypertensive medication use, serum total cholesterol, cholesterol-lowering medication, and diabetes (P for trend = .05).

“The inverse association was more evident for soluble fiber intake and was confined to dementia without a history of stroke,” the authors reported. Moreover, potatoes, not vegetables or fruits, showed a similar association.

“The mechanisms are currently unknown but might involve the interactions that take place between the gut and the brain,” Dr. Yamagishi said in a release.

“One possibility is that soluble fiber regulates the composition of gut bacteria. This composition may affect neuroinflammation, which plays a role in the onset of dementia,” he suggested. “It’s also possible that dietary fiber may reduce other risk factors for dementia, such as body weight, blood pressure, lipids, and glucose levels.”

The authors noted several limitations. For example, they did not distinguish between Alzheimer’s and non-Alzheimer’s dementia. Moreover, they classified dietary habits on the basis of a single survey, and participants’ dietary patterns might have changed over the study period.

In addition, Dr. Yamagishi noted, it is “important to confirm the association in other populations.”
 

Balance is key

In an interview, Uma Naidoo, MD, director of nutritional and lifestyle psychiatry, Massachusetts General Hospital, and nutrition educator at Harvard Medical School, both in Boston, said the study “adds to the growing pool of evidence suggesting that a diet rich in colorful, plant-based foods can benefit our neurological and psychiatric health, especially as we age.”

Dr. Naidoo, a chef and the author of “This Is Your Brain on Food,” who was not involved in the study, continued, “In nutritional psychiatry, balance is key and therefore consuming a well-rounded diet including ample amounts of fiber – particularly from sources like steel-cut oats, beans, lentils, and numerous other fruits and vegetables – can be part of a healthy lifestyle and prevention against cognitive decline in later years.

“While the study authors admit to limitations within the study, in my opinion, eating healthier has so many mental and physical health benefits that it’s a nutritional psychiatry no-brainer,” she added.

The study was partly supported by Health and Labour Science Research Grants for Dementia from the Ministry of Health, Labour and Welfare of Japan; JSPS Kakenhi; FULLHAP; and the Osaka University International Joint Research Promotion Programme with University College London. The authors and Dr. Naidoo report no relevant financial relationships.

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

The COVID-19 pandemic has resulted in notable morbidity and mortality worldwide. In December 2020, the US Food and Drug Administration issued an Emergency Use Authorization for 2 messenger RNA (mRNA) vaccines—produced by Pfizer-BioNTech and Moderna—for the prevention of COVID-19. Phase 3 trials of the vaccine developed by Moderna showed 94.1% efficacy at preventing COVID-19 after 2 doses.¹

Common cutaneous adverse effects of the Moderna COVID-19 Vaccine include injection-site reactions, such as pain, induration, and erythema. Less frequently reported dermatologic adverse effects include diffuse bullous rash and hypersensitivity reactions.¹ We report a case of reactivation of a BCG vaccination scar after the first dose of the Moderna COVID-19 Vaccine.

Case Report

A 48-year-old Asian man who was otherwise healthy presented with erythema, induration, and mild pruritus on the deltoid muscle of the left arm, near the scar from an earlier BCG vaccine, which he received at approximately 5 years of age when living in Taiwan. The patient received the first dose of the Moderna COVID-19 Vaccine approximately 5 to 7 cm distant from the BCG vaccination scar. One to 2 days after inoculation, the patient endorsed tenderness at the site of COVID-19 vaccination but denied systemic symptoms. He had never been given a diagnosis of COVID-19. His SARS-CoV-2 antibody status was unknown.

Eight days later, the patient noticed a well-defined, erythematous, indurated plaque with mild itchiness overlying and around the BCG vaccination scar that did not involve the COVID-19 vaccination site. The following day, the redness and induration became worse (Figure).

The patient was otherwise well. Vital signs were normal; there was no lymphadenopathy. The rash resolved without treatment over the next 4 days.

Comment

The BCG vaccine is an intradermal live attenuated virus vaccine used to prevent certain forms of tuberculosis and potentially other Mycobacterium infections. Although the vaccine is not routinely administered in the United States, it is part of the vaccination schedule in most countries, administered most often to newborns and infants. Administration of the BCG vaccine commonly results in mild localized erythema, swelling, and pain at the injection site. Most inoculated patients also develop an ulcer that heals with the characteristic BCG vaccination scar.^2,3

There is evidence that the BCG vaccine can enhance the innate immune system response and might decrease the rate of infection by unrelated pathogens, including viruses.⁴ Several epidemiologic studies have suggested that the BCG vaccine might offer some protection against COVID-19, possibly due to a resemblance of the amino acid sequences of BCG and SARS-CoV-2, which might provoke cross-reactive T cells.^5,6 Further studies are underway to determine whether the BCG vaccine is truly protective against COVID-19.

BCG vaccination scar reactivation presents as redness, swelling, or ulceration at the BCG injection site months to years after inoculation. Although erythema and induration of the BCG scar are not included in the diagnostic criteria of Kawasaki disease, likely due to variable vaccine requirements in different countries, these findings are largely recognized as specific for Kawasaki disease and present in approximately half of affected patients who received the BCG vaccine.²

Heat Shock Proteins—Heat shock proteins (HSPs) are produced by cells in response to stressors. The proposed mechanism of BCG vaccination scar reactivation is a cross-reaction between human homologue HSP 63 and Mycobacterium HSP 65, leading to hyperactivity of the immune system against BCG.⁷ There also are reports of reactivation of a BCG vaccination scar from measles infection and influenza vaccination.^2,8,9 Most prior reports of BCG vaccination scar reactivation have been in pediatric patients; our patient is an adult who received the BCG vaccine more than 40 years ago.

Mechanism of Reactivation—The mechanism of BCG vaccination scar reactivation in our patient, who received the Moderna COVID-19 Vaccine, is unclear. Possible mechanisms include (1) release of HSP mediated by the COVID-19 vaccine, leading to an immune response at the BCG vaccine scar, or (2) another immune-mediated cross-reaction between BCG and the Moderna COVID-19 Vaccine mRNA nanoparticle or encoded spike protein antigen. It has been hypothesized that the BCG vaccine might offer some protection against COVID-19; this remains uncertain and is under further investigation.¹⁰ A recent retrospective cohort study showed that a BCG vaccination booster may decrease COVID-19 infection rates in higher-risk populations.¹¹

Conclusion

We present a case of BCG vaccine scar reactivation occurring after a dose of the Moderna COVID-19 Vaccine, a likely underreported, self-limiting, cutaneous adverse effect of this mRNA vaccine.

The COVID-19 pandemic has resulted in notable morbidity and mortality worldwide. In December 2020, the US Food and Drug Administration issued an Emergency Use Authorization for 2 messenger RNA (mRNA) vaccines—produced by Pfizer-BioNTech and Moderna—for the prevention of COVID-19. Phase 3 trials of the vaccine developed by Moderna showed 94.1% efficacy at preventing COVID-19 after 2 doses.¹

Common cutaneous adverse effects of the Moderna COVID-19 Vaccine include injection-site reactions, such as pain, induration, and erythema. Less frequently reported dermatologic adverse effects include diffuse bullous rash and hypersensitivity reactions.¹ We report a case of reactivation of a BCG vaccination scar after the first dose of the Moderna COVID-19 Vaccine.

Case Report

A 48-year-old Asian man who was otherwise healthy presented with erythema, induration, and mild pruritus on the deltoid muscle of the left arm, near the scar from an earlier BCG vaccine, which he received at approximately 5 years of age when living in Taiwan. The patient received the first dose of the Moderna COVID-19 Vaccine approximately 5 to 7 cm distant from the BCG vaccination scar. One to 2 days after inoculation, the patient endorsed tenderness at the site of COVID-19 vaccination but denied systemic symptoms. He had never been given a diagnosis of COVID-19. His SARS-CoV-2 antibody status was unknown.

Eight days later, the patient noticed a well-defined, erythematous, indurated plaque with mild itchiness overlying and around the BCG vaccination scar that did not involve the COVID-19 vaccination site. The following day, the redness and induration became worse (Figure).

The patient was otherwise well. Vital signs were normal; there was no lymphadenopathy. The rash resolved without treatment over the next 4 days.

Comment

The BCG vaccine is an intradermal live attenuated virus vaccine used to prevent certain forms of tuberculosis and potentially other Mycobacterium infections. Although the vaccine is not routinely administered in the United States, it is part of the vaccination schedule in most countries, administered most often to newborns and infants. Administration of the BCG vaccine commonly results in mild localized erythema, swelling, and pain at the injection site. Most inoculated patients also develop an ulcer that heals with the characteristic BCG vaccination scar.^2,3

There is evidence that the BCG vaccine can enhance the innate immune system response and might decrease the rate of infection by unrelated pathogens, including viruses.⁴ Several epidemiologic studies have suggested that the BCG vaccine might offer some protection against COVID-19, possibly due to a resemblance of the amino acid sequences of BCG and SARS-CoV-2, which might provoke cross-reactive T cells.^5,6 Further studies are underway to determine whether the BCG vaccine is truly protective against COVID-19.

BCG vaccination scar reactivation presents as redness, swelling, or ulceration at the BCG injection site months to years after inoculation. Although erythema and induration of the BCG scar are not included in the diagnostic criteria of Kawasaki disease, likely due to variable vaccine requirements in different countries, these findings are largely recognized as specific for Kawasaki disease and present in approximately half of affected patients who received the BCG vaccine.²

Heat Shock Proteins—Heat shock proteins (HSPs) are produced by cells in response to stressors. The proposed mechanism of BCG vaccination scar reactivation is a cross-reaction between human homologue HSP 63 and Mycobacterium HSP 65, leading to hyperactivity of the immune system against BCG.⁷ There also are reports of reactivation of a BCG vaccination scar from measles infection and influenza vaccination.^2,8,9 Most prior reports of BCG vaccination scar reactivation have been in pediatric patients; our patient is an adult who received the BCG vaccine more than 40 years ago.

Mechanism of Reactivation—The mechanism of BCG vaccination scar reactivation in our patient, who received the Moderna COVID-19 Vaccine, is unclear. Possible mechanisms include (1) release of HSP mediated by the COVID-19 vaccine, leading to an immune response at the BCG vaccine scar, or (2) another immune-mediated cross-reaction between BCG and the Moderna COVID-19 Vaccine mRNA nanoparticle or encoded spike protein antigen. It has been hypothesized that the BCG vaccine might offer some protection against COVID-19; this remains uncertain and is under further investigation.¹⁰ A recent retrospective cohort study showed that a BCG vaccination booster may decrease COVID-19 infection rates in higher-risk populations.¹¹

Conclusion

We present a case of BCG vaccine scar reactivation occurring after a dose of the Moderna COVID-19 Vaccine, a likely underreported, self-limiting, cutaneous adverse effect of this mRNA vaccine.

The COVID-19 pandemic has resulted in notable morbidity and mortality worldwide. In December 2020, the US Food and Drug Administration issued an Emergency Use Authorization for 2 messenger RNA (mRNA) vaccines—produced by Pfizer-BioNTech and Moderna—for the prevention of COVID-19. Phase 3 trials of the vaccine developed by Moderna showed 94.1% efficacy at preventing COVID-19 after 2 doses.¹

Common cutaneous adverse effects of the Moderna COVID-19 Vaccine include injection-site reactions, such as pain, induration, and erythema. Less frequently reported dermatologic adverse effects include diffuse bullous rash and hypersensitivity reactions.¹ We report a case of reactivation of a BCG vaccination scar after the first dose of the Moderna COVID-19 Vaccine.

Case Report

A 48-year-old Asian man who was otherwise healthy presented with erythema, induration, and mild pruritus on the deltoid muscle of the left arm, near the scar from an earlier BCG vaccine, which he received at approximately 5 years of age when living in Taiwan. The patient received the first dose of the Moderna COVID-19 Vaccine approximately 5 to 7 cm distant from the BCG vaccination scar. One to 2 days after inoculation, the patient endorsed tenderness at the site of COVID-19 vaccination but denied systemic symptoms. He had never been given a diagnosis of COVID-19. His SARS-CoV-2 antibody status was unknown.

Eight days later, the patient noticed a well-defined, erythematous, indurated plaque with mild itchiness overlying and around the BCG vaccination scar that did not involve the COVID-19 vaccination site. The following day, the redness and induration became worse (Figure).

The patient was otherwise well. Vital signs were normal; there was no lymphadenopathy. The rash resolved without treatment over the next 4 days.

Comment

The BCG vaccine is an intradermal live attenuated virus vaccine used to prevent certain forms of tuberculosis and potentially other Mycobacterium infections. Although the vaccine is not routinely administered in the United States, it is part of the vaccination schedule in most countries, administered most often to newborns and infants. Administration of the BCG vaccine commonly results in mild localized erythema, swelling, and pain at the injection site. Most inoculated patients also develop an ulcer that heals with the characteristic BCG vaccination scar.^2,3

There is evidence that the BCG vaccine can enhance the innate immune system response and might decrease the rate of infection by unrelated pathogens, including viruses.⁴ Several epidemiologic studies have suggested that the BCG vaccine might offer some protection against COVID-19, possibly due to a resemblance of the amino acid sequences of BCG and SARS-CoV-2, which might provoke cross-reactive T cells.^5,6 Further studies are underway to determine whether the BCG vaccine is truly protective against COVID-19.

BCG vaccination scar reactivation presents as redness, swelling, or ulceration at the BCG injection site months to years after inoculation. Although erythema and induration of the BCG scar are not included in the diagnostic criteria of Kawasaki disease, likely due to variable vaccine requirements in different countries, these findings are largely recognized as specific for Kawasaki disease and present in approximately half of affected patients who received the BCG vaccine.²

Heat Shock Proteins—Heat shock proteins (HSPs) are produced by cells in response to stressors. The proposed mechanism of BCG vaccination scar reactivation is a cross-reaction between human homologue HSP 63 and Mycobacterium HSP 65, leading to hyperactivity of the immune system against BCG.⁷ There also are reports of reactivation of a BCG vaccination scar from measles infection and influenza vaccination.^2,8,9 Most prior reports of BCG vaccination scar reactivation have been in pediatric patients; our patient is an adult who received the BCG vaccine more than 40 years ago.

Mechanism of Reactivation—The mechanism of BCG vaccination scar reactivation in our patient, who received the Moderna COVID-19 Vaccine, is unclear. Possible mechanisms include (1) release of HSP mediated by the COVID-19 vaccine, leading to an immune response at the BCG vaccine scar, or (2) another immune-mediated cross-reaction between BCG and the Moderna COVID-19 Vaccine mRNA nanoparticle or encoded spike protein antigen. It has been hypothesized that the BCG vaccine might offer some protection against COVID-19; this remains uncertain and is under further investigation.¹⁰ A recent retrospective cohort study showed that a BCG vaccination booster may decrease COVID-19 infection rates in higher-risk populations.¹¹

Conclusion

We present a case of BCG vaccine scar reactivation occurring after a dose of the Moderna COVID-19 Vaccine, a likely underreported, self-limiting, cutaneous adverse effect of this mRNA vaccine.

First responders exposed to toxic dusts and fibers in the aftermath of the World Trade Center (WTC) terror attacks show increased levels of clonal hematopoiesis linked to the development of blood cancers, new research finds. These results add to concerns about the long-term health effects of that exposure and further underscore a need for screening of those exposed.

“These data demonstrate that environmental exposure to the WTC disaster site is associated with a higher burden of clonal hematopoiesis, exceeding that expected in normal aging, and establish a rationale for mutational testing of the larger WTC-exposed population,” report the authors in the study, published March 7 in Nature Medicine.

The findings come from a study of blood samples from WTC first responders, including 429 firefighters and 52 emergency medical service workers, collected between December 2013 and October 2015.

For comparisons, the authors collected blood samples from 255 firefighters from in and around Nashville, Tenn., none of whom had been exposed to the 9/11 disaster.

Genetic analysis of the samples showed that 10% of those in the WTC-exposed cohort (n = 48) had unique somatic mutations considered to likely be pathogenic, and six of those individuals carried one or more of the mutations.

After a multivariate adjustment controlling for age, sex and race/ethnicity, those among the WTC-exposed first responders had a significantly increased odds of clonal hematopoiesis versus nonexposed workers (odds ratio [OR] = 3.14; P = .0006).

The higher risk was further observed in a comparison limited only to the WTC-exposed firefighters versus nonexposed firefighters (OR = 2.93; P = .0014) after the multivariate adjustment. The greater association between WTC exposure and clonal hematopoiesis remained after the researchers controlled for smoking as well as other risk factors among the WTC-exposed group overall (OR = 3.05; P = .0015) and the firefighters-only comparison (OR = 2.78; P = .004).

A history of smoking was not significantly associated with an increased risk of clonal hematopoiesis in either model.

As a risk factor for hematologic malignancy, cardiovascular events, and mortality, “clonal hematopoiesis is a concerning acquired risk not only for diseases that are already associated with WTC exposure but also as the population ages, this may exacerbate their risk profile,” Dr. Anna Nolan, coauthor of the study, and professor of medicine and environmental medicine in the division of pulmonary and critical care, New York University, said in an interview.

The most common gene mutations observed in the WTC-exposed group were those associated with myeloid malignancies, such as chronic myeloid leukemia; however, blood counts in the exposed group showed no association between exposure and mutations linked to cytopenias.

A further analysis on mice, investigating how WTC particulate matter uniquely affects DNA, surprisingly showed that just one exposure to the material was associated with clonal hematopoietic changes.

Courtesy NYU Langone Health

“Exposure to particulates, even at a single time point, can yield clonal mutations that may be risk for multisystem end-organ changes,” Dr. Nolan said.

While the serious health effects of WTC exposure on humans, have been extensively documented, including a study published in February showing increases in skin, prostate and thyroid cancers, clonal hematopoiesis suggests further heightened risks as the exposed population grows older, Dr. Nolan noted.

“[Clonal hematopoiesis] is a concerning acquired risk not only for diseases that are already associated with WTC exposure, but also, as the population ages, this may exacerbate their risk profile,” she said.

Due to the risk, “clinicians should be aware that WTC-exposed first responders have had a significant exposure and that they are at risk for developing several conditions.”

Commenting on this study, William K. Oh, MD, whose team at the Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, has reported in a previous study on the increased risk of prostate cancer among WTC first responders, noted that more time may be necessary to better understand the full effects of the increases in clonal hematopoiesis.

“Though these findings are of concern, there were still no differences in the cohorts in actual hematologic cancers or even cytopenias, suggesting that more time and additional DNA damaging events were needed to transform the clonal hematopoiesis findings to clinically relevant diseases,” Dr. Oh, clinical professor of medicine, said in an interview.

Nevertheless, “if a patient is found on testing to have clonal hematopoiesis, they should be screened more closely for blood disorders and cardiovascular issues than they might otherwise be, though this remains an area of active investigation,” Dr. Oh said.

Dr. Nolan had no disclosures to report. Dr. Oh is the chief medical science officer at Sema4, a genomic testing and data company. 

First responders exposed to toxic dusts and fibers in the aftermath of the World Trade Center (WTC) terror attacks show increased levels of clonal hematopoiesis linked to the development of blood cancers, new research finds. These results add to concerns about the long-term health effects of that exposure and further underscore a need for screening of those exposed.

“These data demonstrate that environmental exposure to the WTC disaster site is associated with a higher burden of clonal hematopoiesis, exceeding that expected in normal aging, and establish a rationale for mutational testing of the larger WTC-exposed population,” report the authors in the study, published March 7 in Nature Medicine.

The findings come from a study of blood samples from WTC first responders, including 429 firefighters and 52 emergency medical service workers, collected between December 2013 and October 2015.

For comparisons, the authors collected blood samples from 255 firefighters from in and around Nashville, Tenn., none of whom had been exposed to the 9/11 disaster.

Genetic analysis of the samples showed that 10% of those in the WTC-exposed cohort (n = 48) had unique somatic mutations considered to likely be pathogenic, and six of those individuals carried one or more of the mutations.

After a multivariate adjustment controlling for age, sex and race/ethnicity, those among the WTC-exposed first responders had a significantly increased odds of clonal hematopoiesis versus nonexposed workers (odds ratio [OR] = 3.14; P = .0006).

The higher risk was further observed in a comparison limited only to the WTC-exposed firefighters versus nonexposed firefighters (OR = 2.93; P = .0014) after the multivariate adjustment. The greater association between WTC exposure and clonal hematopoiesis remained after the researchers controlled for smoking as well as other risk factors among the WTC-exposed group overall (OR = 3.05; P = .0015) and the firefighters-only comparison (OR = 2.78; P = .004).

A history of smoking was not significantly associated with an increased risk of clonal hematopoiesis in either model.

As a risk factor for hematologic malignancy, cardiovascular events, and mortality, “clonal hematopoiesis is a concerning acquired risk not only for diseases that are already associated with WTC exposure but also as the population ages, this may exacerbate their risk profile,” Dr. Anna Nolan, coauthor of the study, and professor of medicine and environmental medicine in the division of pulmonary and critical care, New York University, said in an interview.

The most common gene mutations observed in the WTC-exposed group were those associated with myeloid malignancies, such as chronic myeloid leukemia; however, blood counts in the exposed group showed no association between exposure and mutations linked to cytopenias.

A further analysis on mice, investigating how WTC particulate matter uniquely affects DNA, surprisingly showed that just one exposure to the material was associated with clonal hematopoietic changes.

Courtesy NYU Langone Health

“Exposure to particulates, even at a single time point, can yield clonal mutations that may be risk for multisystem end-organ changes,” Dr. Nolan said.

While the serious health effects of WTC exposure on humans, have been extensively documented, including a study published in February showing increases in skin, prostate and thyroid cancers, clonal hematopoiesis suggests further heightened risks as the exposed population grows older, Dr. Nolan noted.

“[Clonal hematopoiesis] is a concerning acquired risk not only for diseases that are already associated with WTC exposure, but also, as the population ages, this may exacerbate their risk profile,” she said.

Due to the risk, “clinicians should be aware that WTC-exposed first responders have had a significant exposure and that they are at risk for developing several conditions.”

Commenting on this study, William K. Oh, MD, whose team at the Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, has reported in a previous study on the increased risk of prostate cancer among WTC first responders, noted that more time may be necessary to better understand the full effects of the increases in clonal hematopoiesis.

“Though these findings are of concern, there were still no differences in the cohorts in actual hematologic cancers or even cytopenias, suggesting that more time and additional DNA damaging events were needed to transform the clonal hematopoiesis findings to clinically relevant diseases,” Dr. Oh, clinical professor of medicine, said in an interview.

Nevertheless, “if a patient is found on testing to have clonal hematopoiesis, they should be screened more closely for blood disorders and cardiovascular issues than they might otherwise be, though this remains an area of active investigation,” Dr. Oh said.

Dr. Nolan had no disclosures to report. Dr. Oh is the chief medical science officer at Sema4, a genomic testing and data company. 

First responders exposed to toxic dusts and fibers in the aftermath of the World Trade Center (WTC) terror attacks show increased levels of clonal hematopoiesis linked to the development of blood cancers, new research finds. These results add to concerns about the long-term health effects of that exposure and further underscore a need for screening of those exposed.

“These data demonstrate that environmental exposure to the WTC disaster site is associated with a higher burden of clonal hematopoiesis, exceeding that expected in normal aging, and establish a rationale for mutational testing of the larger WTC-exposed population,” report the authors in the study, published March 7 in Nature Medicine.

The findings come from a study of blood samples from WTC first responders, including 429 firefighters and 52 emergency medical service workers, collected between December 2013 and October 2015.

For comparisons, the authors collected blood samples from 255 firefighters from in and around Nashville, Tenn., none of whom had been exposed to the 9/11 disaster.

Genetic analysis of the samples showed that 10% of those in the WTC-exposed cohort (n = 48) had unique somatic mutations considered to likely be pathogenic, and six of those individuals carried one or more of the mutations.

After a multivariate adjustment controlling for age, sex and race/ethnicity, those among the WTC-exposed first responders had a significantly increased odds of clonal hematopoiesis versus nonexposed workers (odds ratio [OR] = 3.14; P = .0006).

The higher risk was further observed in a comparison limited only to the WTC-exposed firefighters versus nonexposed firefighters (OR = 2.93; P = .0014) after the multivariate adjustment. The greater association between WTC exposure and clonal hematopoiesis remained after the researchers controlled for smoking as well as other risk factors among the WTC-exposed group overall (OR = 3.05; P = .0015) and the firefighters-only comparison (OR = 2.78; P = .004).

A history of smoking was not significantly associated with an increased risk of clonal hematopoiesis in either model.

As a risk factor for hematologic malignancy, cardiovascular events, and mortality, “clonal hematopoiesis is a concerning acquired risk not only for diseases that are already associated with WTC exposure but also as the population ages, this may exacerbate their risk profile,” Dr. Anna Nolan, coauthor of the study, and professor of medicine and environmental medicine in the division of pulmonary and critical care, New York University, said in an interview.

The most common gene mutations observed in the WTC-exposed group were those associated with myeloid malignancies, such as chronic myeloid leukemia; however, blood counts in the exposed group showed no association between exposure and mutations linked to cytopenias.

A further analysis on mice, investigating how WTC particulate matter uniquely affects DNA, surprisingly showed that just one exposure to the material was associated with clonal hematopoietic changes.

Courtesy NYU Langone Health

“Exposure to particulates, even at a single time point, can yield clonal mutations that may be risk for multisystem end-organ changes,” Dr. Nolan said.

While the serious health effects of WTC exposure on humans, have been extensively documented, including a study published in February showing increases in skin, prostate and thyroid cancers, clonal hematopoiesis suggests further heightened risks as the exposed population grows older, Dr. Nolan noted.

“[Clonal hematopoiesis] is a concerning acquired risk not only for diseases that are already associated with WTC exposure, but also, as the population ages, this may exacerbate their risk profile,” she said.

Due to the risk, “clinicians should be aware that WTC-exposed first responders have had a significant exposure and that they are at risk for developing several conditions.”

Commenting on this study, William K. Oh, MD, whose team at the Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, has reported in a previous study on the increased risk of prostate cancer among WTC first responders, noted that more time may be necessary to better understand the full effects of the increases in clonal hematopoiesis.

“Though these findings are of concern, there were still no differences in the cohorts in actual hematologic cancers or even cytopenias, suggesting that more time and additional DNA damaging events were needed to transform the clonal hematopoiesis findings to clinically relevant diseases,” Dr. Oh, clinical professor of medicine, said in an interview.

Nevertheless, “if a patient is found on testing to have clonal hematopoiesis, they should be screened more closely for blood disorders and cardiovascular issues than they might otherwise be, though this remains an area of active investigation,” Dr. Oh said.

Dr. Nolan had no disclosures to report. Dr. Oh is the chief medical science officer at Sema4, a genomic testing and data company. 

Some patients with long COVID may have long-lasting nerve damage that could lead to fatigue, sensory changes, and pain in the hands and feet, according to a new study published in the journal Neurology: Neuroimmunology & Neuroinflammation (doi: 10.1212/NXI.0000000000001146).

The nerve damage, which has been seen even among mild coronavirus cases, appears to be caused by immunity problems triggered by infection.

“This is one of the early papers looking into causes of long COVID, which will steadily increase in importance as acute COVID wanes,” Anne Louise Oaklander, MD, the lead study author and a neurologist at Massachusetts General Hospital, Boston, said in a statement.

“Our findings suggest that some long COVID patients had damage to their peripheral nerve fibers and that damage to the small-fiber type of nerve cell may be prominent,” she said.

The research team analyzed data from 17 COVID-19 survivors with lingering symptoms who had no history or risks of neuropathy, or nerve damage or disease. The patients were from 10 states and territories, and all but one had mild infections.

They found that 10 patients – or 59% – had at least one test that confirmed neuropathy. Two patients had rare neuropathies that affected muscle nerves, and 10 were diagnosed with small-fiber neuropathy, which is a cause of chronic pain. Common symptoms included fatigue, weakness, changes in their senses, and pain in their hands and feet.

For treatment, 11 patients were given immunotherapies such as corticosteroids or intravenous immunoglobulins, and the five patients who received repeated IgG treatments appeared to benefit. Over time, 52% of patients improved, though none had all of their symptoms go away.

“Research from our team and others is clarifying what the different types of post-COVID neuropathy are and how best to diagnose and treat them,” she said. “Most long COVID neuropathies described so far appear to reflect immune responses to the virus that went off course.”

Dr. Oaklander noted that researchers haven’t been able to do clinical trials to evaluate specific post-COVID neuropathy treatments. But some existing treatments may help.

“Some patients seem to improve from standard treatments for other immune-related neuropathies,” she said.

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

Some patients with long COVID may have long-lasting nerve damage that could lead to fatigue, sensory changes, and pain in the hands and feet, according to a new study published in the journal Neurology: Neuroimmunology & Neuroinflammation (doi: 10.1212/NXI.0000000000001146).

The nerve damage, which has been seen even among mild coronavirus cases, appears to be caused by immunity problems triggered by infection.

“This is one of the early papers looking into causes of long COVID, which will steadily increase in importance as acute COVID wanes,” Anne Louise Oaklander, MD, the lead study author and a neurologist at Massachusetts General Hospital, Boston, said in a statement.

“Our findings suggest that some long COVID patients had damage to their peripheral nerve fibers and that damage to the small-fiber type of nerve cell may be prominent,” she said.

The research team analyzed data from 17 COVID-19 survivors with lingering symptoms who had no history or risks of neuropathy, or nerve damage or disease. The patients were from 10 states and territories, and all but one had mild infections.

They found that 10 patients – or 59% – had at least one test that confirmed neuropathy. Two patients had rare neuropathies that affected muscle nerves, and 10 were diagnosed with small-fiber neuropathy, which is a cause of chronic pain. Common symptoms included fatigue, weakness, changes in their senses, and pain in their hands and feet.

For treatment, 11 patients were given immunotherapies such as corticosteroids or intravenous immunoglobulins, and the five patients who received repeated IgG treatments appeared to benefit. Over time, 52% of patients improved, though none had all of their symptoms go away.

“Research from our team and others is clarifying what the different types of post-COVID neuropathy are and how best to diagnose and treat them,” she said. “Most long COVID neuropathies described so far appear to reflect immune responses to the virus that went off course.”

Dr. Oaklander noted that researchers haven’t been able to do clinical trials to evaluate specific post-COVID neuropathy treatments. But some existing treatments may help.

“Some patients seem to improve from standard treatments for other immune-related neuropathies,” she said.

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

Some patients with long COVID may have long-lasting nerve damage that could lead to fatigue, sensory changes, and pain in the hands and feet, according to a new study published in the journal Neurology: Neuroimmunology & Neuroinflammation (doi: 10.1212/NXI.0000000000001146).

The nerve damage, which has been seen even among mild coronavirus cases, appears to be caused by immunity problems triggered by infection.

“This is one of the early papers looking into causes of long COVID, which will steadily increase in importance as acute COVID wanes,” Anne Louise Oaklander, MD, the lead study author and a neurologist at Massachusetts General Hospital, Boston, said in a statement.

“Our findings suggest that some long COVID patients had damage to their peripheral nerve fibers and that damage to the small-fiber type of nerve cell may be prominent,” she said.

The research team analyzed data from 17 COVID-19 survivors with lingering symptoms who had no history or risks of neuropathy, or nerve damage or disease. The patients were from 10 states and territories, and all but one had mild infections.

They found that 10 patients – or 59% – had at least one test that confirmed neuropathy. Two patients had rare neuropathies that affected muscle nerves, and 10 were diagnosed with small-fiber neuropathy, which is a cause of chronic pain. Common symptoms included fatigue, weakness, changes in their senses, and pain in their hands and feet.

For treatment, 11 patients were given immunotherapies such as corticosteroids or intravenous immunoglobulins, and the five patients who received repeated IgG treatments appeared to benefit. Over time, 52% of patients improved, though none had all of their symptoms go away.

“Research from our team and others is clarifying what the different types of post-COVID neuropathy are and how best to diagnose and treat them,” she said. “Most long COVID neuropathies described so far appear to reflect immune responses to the virus that went off course.”

Dr. Oaklander noted that researchers haven’t been able to do clinical trials to evaluate specific post-COVID neuropathy treatments. But some existing treatments may help.

“Some patients seem to improve from standard treatments for other immune-related neuropathies,” she said.

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