Clinician Reviews

PHOENIX – Combining a serum containing silymarin with nonablative laser therapy could serve as a promising solution for decreasing inflammation, postinflammatory erythema (PIE), and postinflammatory hyperpigmentation (PIH) associated with acne lesions, results from a prospective, single-center study showed.

“Acne vulgaris is the most common inflammatory dermatosis worldwide, often resulting in sequelae such as scarring, PIE, and PIH,” presenting author Jamie Hu, MD, said at the annual conference of the American Society for Laser Medicine and Surgery, where the study results were presented during an abstract session. “This dyschromia can cause greater psychological distress than the original acne lesions, and disproportionately affects skin of color patients.”

Blemish-prone skin is known to have higher levels of sebum and lower levels of antioxidants, leading to lipid peroxidation and oxidative stress, resulting in proliferation of Cutibacterium acnes and an inflammatory cascade that has recently been implicated in postinflammatory dyschromia and the development of PIE and PIH, noted Dr. Hu, a dermatology resident at the University of Miami. “Therefore, the use of antioxidants presents an opportunity to disrupt blemish and dyschromia,” she said.

One such antioxidant is silymarin, which is derived from the milk thistle plant. Recent studies have demonstrated that silymarin reduces proinflammatory mediators, prevents lipid peroxidation, and presents a new way to target the treatment of both acne and postinflammatory dyschromia.

Dr. Hu’s mentor, Jill S. Waibel, MD, owner and medical director of the Miami Dermatology and Laser Institute, hypothesized that nonablative laser therapy followed by topical application of silymarin would improve acne-associated postinflammatory dyschromia. To test her hunch, she conducted a 12-week, prospective trial in which 24 patients with PIE and/or PIH were randomized to one of two treatment arms: laser treatment with topical antioxidants or laser treatment with vehicle control. Patients received three laser treatments, each 1 month apart. The topical antioxidant used was Silymarin CF, a serum that contains 0.5% silymarin, 0.5% salicylic acid, 15% L-ascorbic acid, and 0.5% ferulic acid. (The study was sponsored by SkinCeuticals, the manufacturer of the serum.)

Laser selection was made primarily on the type of dyschromia, with PIE patients receiving treatment with the pulsed dye laser and PIH patients receiving treatment with the 1,927-nm thulium laser. Patients were treated on days 0, 28, and 56 of the 12-week study, followed by immediate application of topical antioxidants or vehicle control. They were also instructed to apply the assigned topical twice daily for the duration of the study. Patients ranged in age from 21 to 61 years, and 20 had skin types III-IV.

To evaluate efficacy, the researchers conducted blinded clinical assessments with the postacne hyperpigmentation index (PAHPI) and the Global Aesthetic Improvement Scale (GAIS), instrumentation with the Mexameter, a device that captures erythema and melanin index values, and visual diagnostics with optical coherence tomography (OCT).

Dr. Hu reported that at week 12, the PAHPI in the silymarin-plus-laser treatment group fell from an average of 3.18 to 1.74 (a decrease of 1.44), which suggested an improvement trend, compared with the laser treatment–only group, whose PAHPI fell from an average of 3.25 to 1.97 (a decrease of 1.28).

As for the GAIS, a one-time score assessed at the end of the trial, the average score for all patients was 3.24, which translated to “much improved/very much improved.” Patients in the silymarin-plus-laser treatment group had higher average scores compared with patients in the laser treatment–only group (3.35 vs. 3.10, respectively), but the differences did not reach statistical significance.

According to results of the Mexameter assessment, paired t-tests showed that the levels of intralesional melanin decreased significantly for patients in the silymarin-plus-laser treatment group, compared with the laser treatment–only group (P < .05). OCT assessments demonstrated an increase in dermal brightness in both groups, corresponding to an increase in dermal collagen, as well as an increase in blood vessel density.

In an interview at the meeting, Dr. Waibel, subsection chief of dermatology at Baptist Hospital of Miami, said that future studies will focus on long-term follow-up to determine if acne scars can be prevented by combining silymarin with lasers to prevent PIH and PIE. “That would be priceless,” she said. “I believe that the PIH is what causes damage to the collagen, and that damage to the collagen is what causes the scarring. So, if we can prevent or treat PIH, we may be able to prevent scarring.”

This approach, she added, “would decrease the pharmaceutical cost because I think there are many dermatologists who are treating PEI and PIH as active acne. You really have to have a keen eye for understanding the differences and you really have to be looking, because PIE and PIH are flat, whereas active acne consists of either comedones or nodules.”

She noted that in skin of color patients, she has seen PIH persist for 9 or 10 months after treatment with isotretinoin. “It’s not the isotretinoin causing the scars, or even the acne, it’s the prolonged inflammation,” she said.

Catherine M. DiGiorgio, MD, a Boston-based laser and cosmetic dermatologist who was asked to comment on the study, said that patients and dermatologists frequently seek alternatives to hydroquinone for unwanted hyperpigmentation.

Dr. DiGiorgio

Dr. Jalian

“While the study failed to show statistically significant improvement in postinflammatory erythema with concomitant laser and topical therapy versus laser alone, the promising data supporting concurrent use of topicals and fractional lasers for treatment of PIH, particularly in dark skin phototypes, is a clinically impactful contribution to our daily practice,” he said.

Dr. Waibel disclosed that she has conducted clinical trials for many device and pharmaceutical companies including SkinCeuticals. Dr. Hu, Dr. DiGiorgio, and Dr. Jalian were not involved with the study and reported having no relevant disclosures.

PHOENIX – Combining a serum containing silymarin with nonablative laser therapy could serve as a promising solution for decreasing inflammation, postinflammatory erythema (PIE), and postinflammatory hyperpigmentation (PIH) associated with acne lesions, results from a prospective, single-center study showed.

“Acne vulgaris is the most common inflammatory dermatosis worldwide, often resulting in sequelae such as scarring, PIE, and PIH,” presenting author Jamie Hu, MD, said at the annual conference of the American Society for Laser Medicine and Surgery, where the study results were presented during an abstract session. “This dyschromia can cause greater psychological distress than the original acne lesions, and disproportionately affects skin of color patients.”

Blemish-prone skin is known to have higher levels of sebum and lower levels of antioxidants, leading to lipid peroxidation and oxidative stress, resulting in proliferation of Cutibacterium acnes and an inflammatory cascade that has recently been implicated in postinflammatory dyschromia and the development of PIE and PIH, noted Dr. Hu, a dermatology resident at the University of Miami. “Therefore, the use of antioxidants presents an opportunity to disrupt blemish and dyschromia,” she said.

One such antioxidant is silymarin, which is derived from the milk thistle plant. Recent studies have demonstrated that silymarin reduces proinflammatory mediators, prevents lipid peroxidation, and presents a new way to target the treatment of both acne and postinflammatory dyschromia.

Dr. Hu’s mentor, Jill S. Waibel, MD, owner and medical director of the Miami Dermatology and Laser Institute, hypothesized that nonablative laser therapy followed by topical application of silymarin would improve acne-associated postinflammatory dyschromia. To test her hunch, she conducted a 12-week, prospective trial in which 24 patients with PIE and/or PIH were randomized to one of two treatment arms: laser treatment with topical antioxidants or laser treatment with vehicle control. Patients received three laser treatments, each 1 month apart. The topical antioxidant used was Silymarin CF, a serum that contains 0.5% silymarin, 0.5% salicylic acid, 15% L-ascorbic acid, and 0.5% ferulic acid. (The study was sponsored by SkinCeuticals, the manufacturer of the serum.)

Laser selection was made primarily on the type of dyschromia, with PIE patients receiving treatment with the pulsed dye laser and PIH patients receiving treatment with the 1,927-nm thulium laser. Patients were treated on days 0, 28, and 56 of the 12-week study, followed by immediate application of topical antioxidants or vehicle control. They were also instructed to apply the assigned topical twice daily for the duration of the study. Patients ranged in age from 21 to 61 years, and 20 had skin types III-IV.

To evaluate efficacy, the researchers conducted blinded clinical assessments with the postacne hyperpigmentation index (PAHPI) and the Global Aesthetic Improvement Scale (GAIS), instrumentation with the Mexameter, a device that captures erythema and melanin index values, and visual diagnostics with optical coherence tomography (OCT).

Dr. Hu reported that at week 12, the PAHPI in the silymarin-plus-laser treatment group fell from an average of 3.18 to 1.74 (a decrease of 1.44), which suggested an improvement trend, compared with the laser treatment–only group, whose PAHPI fell from an average of 3.25 to 1.97 (a decrease of 1.28).

As for the GAIS, a one-time score assessed at the end of the trial, the average score for all patients was 3.24, which translated to “much improved/very much improved.” Patients in the silymarin-plus-laser treatment group had higher average scores compared with patients in the laser treatment–only group (3.35 vs. 3.10, respectively), but the differences did not reach statistical significance.

According to results of the Mexameter assessment, paired t-tests showed that the levels of intralesional melanin decreased significantly for patients in the silymarin-plus-laser treatment group, compared with the laser treatment–only group (P < .05). OCT assessments demonstrated an increase in dermal brightness in both groups, corresponding to an increase in dermal collagen, as well as an increase in blood vessel density.

In an interview at the meeting, Dr. Waibel, subsection chief of dermatology at Baptist Hospital of Miami, said that future studies will focus on long-term follow-up to determine if acne scars can be prevented by combining silymarin with lasers to prevent PIH and PIE. “That would be priceless,” she said. “I believe that the PIH is what causes damage to the collagen, and that damage to the collagen is what causes the scarring. So, if we can prevent or treat PIH, we may be able to prevent scarring.”

This approach, she added, “would decrease the pharmaceutical cost because I think there are many dermatologists who are treating PEI and PIH as active acne. You really have to have a keen eye for understanding the differences and you really have to be looking, because PIE and PIH are flat, whereas active acne consists of either comedones or nodules.”

She noted that in skin of color patients, she has seen PIH persist for 9 or 10 months after treatment with isotretinoin. “It’s not the isotretinoin causing the scars, or even the acne, it’s the prolonged inflammation,” she said.

Catherine M. DiGiorgio, MD, a Boston-based laser and cosmetic dermatologist who was asked to comment on the study, said that patients and dermatologists frequently seek alternatives to hydroquinone for unwanted hyperpigmentation.

Dr. DiGiorgio

Dr. Jalian

“While the study failed to show statistically significant improvement in postinflammatory erythema with concomitant laser and topical therapy versus laser alone, the promising data supporting concurrent use of topicals and fractional lasers for treatment of PIH, particularly in dark skin phototypes, is a clinically impactful contribution to our daily practice,” he said.

Dr. Waibel disclosed that she has conducted clinical trials for many device and pharmaceutical companies including SkinCeuticals. Dr. Hu, Dr. DiGiorgio, and Dr. Jalian were not involved with the study and reported having no relevant disclosures.

PHOENIX – Combining a serum containing silymarin with nonablative laser therapy could serve as a promising solution for decreasing inflammation, postinflammatory erythema (PIE), and postinflammatory hyperpigmentation (PIH) associated with acne lesions, results from a prospective, single-center study showed.

“Acne vulgaris is the most common inflammatory dermatosis worldwide, often resulting in sequelae such as scarring, PIE, and PIH,” presenting author Jamie Hu, MD, said at the annual conference of the American Society for Laser Medicine and Surgery, where the study results were presented during an abstract session. “This dyschromia can cause greater psychological distress than the original acne lesions, and disproportionately affects skin of color patients.”

Blemish-prone skin is known to have higher levels of sebum and lower levels of antioxidants, leading to lipid peroxidation and oxidative stress, resulting in proliferation of Cutibacterium acnes and an inflammatory cascade that has recently been implicated in postinflammatory dyschromia and the development of PIE and PIH, noted Dr. Hu, a dermatology resident at the University of Miami. “Therefore, the use of antioxidants presents an opportunity to disrupt blemish and dyschromia,” she said.

One such antioxidant is silymarin, which is derived from the milk thistle plant. Recent studies have demonstrated that silymarin reduces proinflammatory mediators, prevents lipid peroxidation, and presents a new way to target the treatment of both acne and postinflammatory dyschromia.

Dr. Hu’s mentor, Jill S. Waibel, MD, owner and medical director of the Miami Dermatology and Laser Institute, hypothesized that nonablative laser therapy followed by topical application of silymarin would improve acne-associated postinflammatory dyschromia. To test her hunch, she conducted a 12-week, prospective trial in which 24 patients with PIE and/or PIH were randomized to one of two treatment arms: laser treatment with topical antioxidants or laser treatment with vehicle control. Patients received three laser treatments, each 1 month apart. The topical antioxidant used was Silymarin CF, a serum that contains 0.5% silymarin, 0.5% salicylic acid, 15% L-ascorbic acid, and 0.5% ferulic acid. (The study was sponsored by SkinCeuticals, the manufacturer of the serum.)

Laser selection was made primarily on the type of dyschromia, with PIE patients receiving treatment with the pulsed dye laser and PIH patients receiving treatment with the 1,927-nm thulium laser. Patients were treated on days 0, 28, and 56 of the 12-week study, followed by immediate application of topical antioxidants or vehicle control. They were also instructed to apply the assigned topical twice daily for the duration of the study. Patients ranged in age from 21 to 61 years, and 20 had skin types III-IV.

To evaluate efficacy, the researchers conducted blinded clinical assessments with the postacne hyperpigmentation index (PAHPI) and the Global Aesthetic Improvement Scale (GAIS), instrumentation with the Mexameter, a device that captures erythema and melanin index values, and visual diagnostics with optical coherence tomography (OCT).

Dr. Hu reported that at week 12, the PAHPI in the silymarin-plus-laser treatment group fell from an average of 3.18 to 1.74 (a decrease of 1.44), which suggested an improvement trend, compared with the laser treatment–only group, whose PAHPI fell from an average of 3.25 to 1.97 (a decrease of 1.28).

As for the GAIS, a one-time score assessed at the end of the trial, the average score for all patients was 3.24, which translated to “much improved/very much improved.” Patients in the silymarin-plus-laser treatment group had higher average scores compared with patients in the laser treatment–only group (3.35 vs. 3.10, respectively), but the differences did not reach statistical significance.

According to results of the Mexameter assessment, paired t-tests showed that the levels of intralesional melanin decreased significantly for patients in the silymarin-plus-laser treatment group, compared with the laser treatment–only group (P < .05). OCT assessments demonstrated an increase in dermal brightness in both groups, corresponding to an increase in dermal collagen, as well as an increase in blood vessel density.

In an interview at the meeting, Dr. Waibel, subsection chief of dermatology at Baptist Hospital of Miami, said that future studies will focus on long-term follow-up to determine if acne scars can be prevented by combining silymarin with lasers to prevent PIH and PIE. “That would be priceless,” she said. “I believe that the PIH is what causes damage to the collagen, and that damage to the collagen is what causes the scarring. So, if we can prevent or treat PIH, we may be able to prevent scarring.”

This approach, she added, “would decrease the pharmaceutical cost because I think there are many dermatologists who are treating PEI and PIH as active acne. You really have to have a keen eye for understanding the differences and you really have to be looking, because PIE and PIH are flat, whereas active acne consists of either comedones or nodules.”

She noted that in skin of color patients, she has seen PIH persist for 9 or 10 months after treatment with isotretinoin. “It’s not the isotretinoin causing the scars, or even the acne, it’s the prolonged inflammation,” she said.

Catherine M. DiGiorgio, MD, a Boston-based laser and cosmetic dermatologist who was asked to comment on the study, said that patients and dermatologists frequently seek alternatives to hydroquinone for unwanted hyperpigmentation.

Dr. DiGiorgio

Dr. Jalian

“While the study failed to show statistically significant improvement in postinflammatory erythema with concomitant laser and topical therapy versus laser alone, the promising data supporting concurrent use of topicals and fractional lasers for treatment of PIH, particularly in dark skin phototypes, is a clinically impactful contribution to our daily practice,” he said.

Dr. Waibel disclosed that she has conducted clinical trials for many device and pharmaceutical companies including SkinCeuticals. Dr. Hu, Dr. DiGiorgio, and Dr. Jalian were not involved with the study and reported having no relevant disclosures.

Taking a swing against arthritis

Osteoarthritis is a tough disease to manage. Exercise helps ease the stiffness and pain of the joints, but at the same time, the disease makes it difficult to do that beneficial exercise. Even a relatively simple activity like jogging can hurt more than it helps. If only there were a low-impact exercise that was incredibly popular among the generally older population who are likely to have arthritis.

We love a good golf study here at LOTME, and a group of Australian and U.K. researchers have provided. Osteoarthritis affects 2 million people in the land down under, making it the most common source of disability there. In that population, only 64% reported their physical health to be good, very good, or excellent. Among the 459 golfers with OA that the study authors surveyed, however, the percentage reporting good health rose to more than 90%.

jacoblund/Getty Images

A similar story emerged when they looked at mental health. Nearly a quarter of nongolfers with OA reported high or very high levels of psychological distress, compared with just 8% of golfers. This pattern of improved physical and mental health remained when the researchers looked at the general, non-OA population.

This isn’t the first time golf’s been connected with improved health, and previous studies have shown golf to reduce the risks of cardiovascular disease, diabetes, and obesity, among other things. Just walking one 18-hole round significantly exceeds the CDC’s recommended 150 minutes of physical activity per week. Go out multiple times a week – leaving the cart and beer at home, American golfers – and you’ll be fit for a lifetime.

The golfers on our staff, however, are still waiting for those mental health benefits to kick in. Because when we’re adding up our scorecard after that string of four double bogeys to end the round, we’re most definitely thinking: “Yes, this sport is reducing my psychological distress. I am having fun right now.”
 

Battle of the sexes’ intestines

There are, we’re sure you’ve noticed, some differences between males and females. Females, for one thing, have longer small intestines than males. Everybody knows that, right? You didn’t know? Really? … Really?

Afif Ramdhasuma/Unsplash

Well, then, we’re guessing you haven’t read “Hidden diversity: Comparative functional morphology of humans and other species” by Erin A. McKenney, PhD, of North Carolina State University, Raleigh, and associates, which just appeared in PeerJ. We couldn’t put it down, even in the shower – a real page-turner/scroller. (It’s a great way to clean a phone, for those who also like to scroll, text, or talk on the toilet.)

The researchers got out their rulers, calipers, and string and took many measurements of the digestive systems of 45 human cadavers (21 female and 24 male), which were compared with data from 10 rats, 10 pigs, and 10 bullfrogs, which had been collected (the measurements, not the animals) by undergraduate students enrolled in a comparative anatomy laboratory course at the university.

There was little intestinal-length variation among the four-legged subjects, but when it comes to humans, females have “consistently and significantly longer small intestines than males,” the investigators noted.

The women’s small intestines, almost 14 feet long on average, were about a foot longer than the men’s, which suggests that women are better able to extract nutrients from food and “supports the canalization hypothesis, which posits that women are better able to survive during periods of stress,” coauthor Amanda Hale said in a written statement from the school. The way to a man’s heart may be through his stomach, but the way to a woman’s heart is through her duodenum, it seems.

Fascinating stuff, to be sure, but the thing that really caught our eye in the PeerJ article was the authors’ suggestion “that organs behave independently of one another, both within and across species.” Organs behaving independently? A somewhat ominous concept, no doubt, but it does explain a lot of the sounds we hear coming from our guts, which can get pretty frightening, especially on chili night.
 

Dog walking is dangerous business

Yes, you did read that right. A lot of strange things can send you to the emergency department. Go ahead and add dog walking onto that list.

Investigators from Johns Hopkins University estimate that over 422,000 adults presented to U.S. emergency departments with leash-dependent dog walking-related injuries between 2001 and 2020.

freestocks/Unsplash

With almost 53% of U.S. households owning at least one dog in 2021-2022 in the wake of the COVID pet boom, this kind of occurrence is becoming more common than you think. The annual number of dog-walking injuries more than quadrupled from 7,300 to 32,000 over the course of the study, and the researchers link that spike to the promotion of dog walking for fitness, along with the boost of ownership itself.

The most common injuries listed in the National Electronic Injury Surveillance System database were finger fracture, traumatic brain injury, and shoulder sprain or strain. These mostly involved falls from being pulled, tripped, or tangled up in the leash while walking. For those aged 65 years and older, traumatic brain injury and hip fracture were the most common.

Women were 50% more likely to sustain a fracture than were men, and dog owners aged 65 and older were three times as likely to fall, twice as likely to get a fracture, and 60% more likely to have brain injury than were younger people. Now, that’s not to say younger people don’t also get hurt. After all, dogs aren’t ageists. The researchers have that data but it’s coming out later.

Meanwhile, the pitfalls involved with just trying to get our daily steps in while letting Muffin do her business have us on the lookout for random squirrels.

Taking a swing against arthritis

Osteoarthritis is a tough disease to manage. Exercise helps ease the stiffness and pain of the joints, but at the same time, the disease makes it difficult to do that beneficial exercise. Even a relatively simple activity like jogging can hurt more than it helps. If only there were a low-impact exercise that was incredibly popular among the generally older population who are likely to have arthritis.

We love a good golf study here at LOTME, and a group of Australian and U.K. researchers have provided. Osteoarthritis affects 2 million people in the land down under, making it the most common source of disability there. In that population, only 64% reported their physical health to be good, very good, or excellent. Among the 459 golfers with OA that the study authors surveyed, however, the percentage reporting good health rose to more than 90%.

jacoblund/Getty Images

A similar story emerged when they looked at mental health. Nearly a quarter of nongolfers with OA reported high or very high levels of psychological distress, compared with just 8% of golfers. This pattern of improved physical and mental health remained when the researchers looked at the general, non-OA population.

This isn’t the first time golf’s been connected with improved health, and previous studies have shown golf to reduce the risks of cardiovascular disease, diabetes, and obesity, among other things. Just walking one 18-hole round significantly exceeds the CDC’s recommended 150 minutes of physical activity per week. Go out multiple times a week – leaving the cart and beer at home, American golfers – and you’ll be fit for a lifetime.

The golfers on our staff, however, are still waiting for those mental health benefits to kick in. Because when we’re adding up our scorecard after that string of four double bogeys to end the round, we’re most definitely thinking: “Yes, this sport is reducing my psychological distress. I am having fun right now.”
 

Battle of the sexes’ intestines

There are, we’re sure you’ve noticed, some differences between males and females. Females, for one thing, have longer small intestines than males. Everybody knows that, right? You didn’t know? Really? … Really?

Afif Ramdhasuma/Unsplash

Well, then, we’re guessing you haven’t read “Hidden diversity: Comparative functional morphology of humans and other species” by Erin A. McKenney, PhD, of North Carolina State University, Raleigh, and associates, which just appeared in PeerJ. We couldn’t put it down, even in the shower – a real page-turner/scroller. (It’s a great way to clean a phone, for those who also like to scroll, text, or talk on the toilet.)

The researchers got out their rulers, calipers, and string and took many measurements of the digestive systems of 45 human cadavers (21 female and 24 male), which were compared with data from 10 rats, 10 pigs, and 10 bullfrogs, which had been collected (the measurements, not the animals) by undergraduate students enrolled in a comparative anatomy laboratory course at the university.

There was little intestinal-length variation among the four-legged subjects, but when it comes to humans, females have “consistently and significantly longer small intestines than males,” the investigators noted.

The women’s small intestines, almost 14 feet long on average, were about a foot longer than the men’s, which suggests that women are better able to extract nutrients from food and “supports the canalization hypothesis, which posits that women are better able to survive during periods of stress,” coauthor Amanda Hale said in a written statement from the school. The way to a man’s heart may be through his stomach, but the way to a woman’s heart is through her duodenum, it seems.

Fascinating stuff, to be sure, but the thing that really caught our eye in the PeerJ article was the authors’ suggestion “that organs behave independently of one another, both within and across species.” Organs behaving independently? A somewhat ominous concept, no doubt, but it does explain a lot of the sounds we hear coming from our guts, which can get pretty frightening, especially on chili night.
 

Dog walking is dangerous business

Yes, you did read that right. A lot of strange things can send you to the emergency department. Go ahead and add dog walking onto that list.

Investigators from Johns Hopkins University estimate that over 422,000 adults presented to U.S. emergency departments with leash-dependent dog walking-related injuries between 2001 and 2020.

freestocks/Unsplash

With almost 53% of U.S. households owning at least one dog in 2021-2022 in the wake of the COVID pet boom, this kind of occurrence is becoming more common than you think. The annual number of dog-walking injuries more than quadrupled from 7,300 to 32,000 over the course of the study, and the researchers link that spike to the promotion of dog walking for fitness, along with the boost of ownership itself.

The most common injuries listed in the National Electronic Injury Surveillance System database were finger fracture, traumatic brain injury, and shoulder sprain or strain. These mostly involved falls from being pulled, tripped, or tangled up in the leash while walking. For those aged 65 years and older, traumatic brain injury and hip fracture were the most common.

Women were 50% more likely to sustain a fracture than were men, and dog owners aged 65 and older were three times as likely to fall, twice as likely to get a fracture, and 60% more likely to have brain injury than were younger people. Now, that’s not to say younger people don’t also get hurt. After all, dogs aren’t ageists. The researchers have that data but it’s coming out later.

Meanwhile, the pitfalls involved with just trying to get our daily steps in while letting Muffin do her business have us on the lookout for random squirrels.

Taking a swing against arthritis

Osteoarthritis is a tough disease to manage. Exercise helps ease the stiffness and pain of the joints, but at the same time, the disease makes it difficult to do that beneficial exercise. Even a relatively simple activity like jogging can hurt more than it helps. If only there were a low-impact exercise that was incredibly popular among the generally older population who are likely to have arthritis.

We love a good golf study here at LOTME, and a group of Australian and U.K. researchers have provided. Osteoarthritis affects 2 million people in the land down under, making it the most common source of disability there. In that population, only 64% reported their physical health to be good, very good, or excellent. Among the 459 golfers with OA that the study authors surveyed, however, the percentage reporting good health rose to more than 90%.

jacoblund/Getty Images

A similar story emerged when they looked at mental health. Nearly a quarter of nongolfers with OA reported high or very high levels of psychological distress, compared with just 8% of golfers. This pattern of improved physical and mental health remained when the researchers looked at the general, non-OA population.

This isn’t the first time golf’s been connected with improved health, and previous studies have shown golf to reduce the risks of cardiovascular disease, diabetes, and obesity, among other things. Just walking one 18-hole round significantly exceeds the CDC’s recommended 150 minutes of physical activity per week. Go out multiple times a week – leaving the cart and beer at home, American golfers – and you’ll be fit for a lifetime.

The golfers on our staff, however, are still waiting for those mental health benefits to kick in. Because when we’re adding up our scorecard after that string of four double bogeys to end the round, we’re most definitely thinking: “Yes, this sport is reducing my psychological distress. I am having fun right now.”
 

Battle of the sexes’ intestines

There are, we’re sure you’ve noticed, some differences between males and females. Females, for one thing, have longer small intestines than males. Everybody knows that, right? You didn’t know? Really? … Really?

Afif Ramdhasuma/Unsplash

Well, then, we’re guessing you haven’t read “Hidden diversity: Comparative functional morphology of humans and other species” by Erin A. McKenney, PhD, of North Carolina State University, Raleigh, and associates, which just appeared in PeerJ. We couldn’t put it down, even in the shower – a real page-turner/scroller. (It’s a great way to clean a phone, for those who also like to scroll, text, or talk on the toilet.)

The researchers got out their rulers, calipers, and string and took many measurements of the digestive systems of 45 human cadavers (21 female and 24 male), which were compared with data from 10 rats, 10 pigs, and 10 bullfrogs, which had been collected (the measurements, not the animals) by undergraduate students enrolled in a comparative anatomy laboratory course at the university.

There was little intestinal-length variation among the four-legged subjects, but when it comes to humans, females have “consistently and significantly longer small intestines than males,” the investigators noted.

The women’s small intestines, almost 14 feet long on average, were about a foot longer than the men’s, which suggests that women are better able to extract nutrients from food and “supports the canalization hypothesis, which posits that women are better able to survive during periods of stress,” coauthor Amanda Hale said in a written statement from the school. The way to a man’s heart may be through his stomach, but the way to a woman’s heart is through her duodenum, it seems.

Fascinating stuff, to be sure, but the thing that really caught our eye in the PeerJ article was the authors’ suggestion “that organs behave independently of one another, both within and across species.” Organs behaving independently? A somewhat ominous concept, no doubt, but it does explain a lot of the sounds we hear coming from our guts, which can get pretty frightening, especially on chili night.
 

Dog walking is dangerous business

Yes, you did read that right. A lot of strange things can send you to the emergency department. Go ahead and add dog walking onto that list.

Investigators from Johns Hopkins University estimate that over 422,000 adults presented to U.S. emergency departments with leash-dependent dog walking-related injuries between 2001 and 2020.

freestocks/Unsplash

With almost 53% of U.S. households owning at least one dog in 2021-2022 in the wake of the COVID pet boom, this kind of occurrence is becoming more common than you think. The annual number of dog-walking injuries more than quadrupled from 7,300 to 32,000 over the course of the study, and the researchers link that spike to the promotion of dog walking for fitness, along with the boost of ownership itself.

The most common injuries listed in the National Electronic Injury Surveillance System database were finger fracture, traumatic brain injury, and shoulder sprain or strain. These mostly involved falls from being pulled, tripped, or tangled up in the leash while walking. For those aged 65 years and older, traumatic brain injury and hip fracture were the most common.

Women were 50% more likely to sustain a fracture than were men, and dog owners aged 65 and older were three times as likely to fall, twice as likely to get a fracture, and 60% more likely to have brain injury than were younger people. Now, that’s not to say younger people don’t also get hurt. After all, dogs aren’t ageists. The researchers have that data but it’s coming out later.

Meanwhile, the pitfalls involved with just trying to get our daily steps in while letting Muffin do her business have us on the lookout for random squirrels.

BOSTON – Atogepant helped reduce the number of mean migraine days among adults with episodic migraine who failed multiple other oral migraine medications, according to findings from a study presented at the 2023 annual meeting of the American Academy of Neurology.

Initial results from the double-blind ELEVATE trial showed the oral atogepant group had significantly fewer mean monthly migraine days (MMD) compared with a placebo group. There was also a significant difference in the number of participants who achieved 50% or greater reduction in the number of mean MMDs and a significant reduction in acute medication use days compared with the placebo group, according to Patricia Pozo-Rosich, MD, PhD, a headache specialist in the neurology department and director of the headache and craniofacial pain clinical unit and the Migraine Adaptive Brain Center at the Vall d’Hebron University Hospital in Barcelona, and colleagues.

Vall d’Hebron University Hospital

The oral calcitonin gene-related peptide (CGRP) receptor antagonist is currently approved in the United States by the Food and Drug Administration as a preventative for both episodic and chronic migraine.
 

Results from ELEVATE

Overall, ELEVATE’s initial efficacy analysis population consisted of 309 adults aged between 18 and 80 years from North America and Europe with episodic migraine who had 4-14 MMDs and had treatment failure with at least two classes of conventional oral medication. After a 28-day screening period, participants received either 60 mg of oral atogepant once per day (154 participants) or a placebo (155 participants). In the efficacy analysis population, 56.0% of participants had failed two oral migraine preventative medication classes, while 44.0% failed three or more classes of medication. Dr. Pozo-Rosich noted that participants were taking a number of different oral preventatives across different medication classes, including flunarizine, beta blockers, topiramate, and amitriptyline, but data are not yet available on which participants had received certain combinations of oral medications.

“[T]hese people have already taken some type of prevention, so they’re not naive patients,” she said. “They’re usually more or less well treated in the sense of having had a contact with specialists or a general neurologist, someone that actually tries to do some prevention.”

The researchers examined change from MMDs at baseline and at 12 weeks as a primary outcome, with 50% or greater MMD reduction, change in mean monthly headache days, and change in acute medication use days as secondary outcomes. Regarding the different acute medications used, Dr. Pozo-Rosich said the main three types were analgesics, nonsteroid anti-inflammatory drugs, and triptans, with participants excluded from the trial if they were taking opioids.

The results showed participants in the atogepant group had significantly fewer mean MMDs compared with the placebo group at 12 weeks compared with baseline (–4.20 vs. –1.85 days; P < .0001). Researchers also found statistically significant improvement in the atogepant group for 50% or greater reduction in MMD, change in mean monthly headache days, and change in acute medication use days across 12 weeks of treatment compared with the placebo group. While the specific data analyses for secondary outcomes were not conducted in the initial analysis, Dr. Pozo-Rosich said the numbers “correlate with the primary outcome” as seen in other migraine trials.

Compared with the placebo group, participants in the atogepant group had higher rates of constipation (10.3% vs. 2.5%), COVID-19 (9.6% vs. 8.3%), and nausea (7.1% vs. 3.2%), while the placebo group had a higher rate of nasopharyngitis (5.1% vs. 7.6%).*

Migraine is a prevalent and undertreated disease, and patients around the world with migraine are in need of treatment options that are both safe and effective, Dr. Pozo-Rosich said in an interview. “[E]ven in these hard-to-treat or difficult-to-treat migraine patients, you have a drug that works, and is safe, and well tolerated and effective,” she said.

That’s “kind of good news for all of us,” she said. Patients “need this type of good news and solution,” she explained, because they may not tolerate or have access to injectable medications. Atogepant would also give clinicians have another option to offer patients with difficult-to-treat migraine cases, she noted. “It makes life easier for many physicians and many patients for many different reasons,” she said.

Dr. Pozo-Rosich said the likely next step in the research is to conduct the main analysis as well as post hoc analyses with accumulated data from pathology trials “to understand patterns of response, understand the sustainability of the response, [and] adherence to the treatment in the long term.”
 

‘Exciting that it works well’ in difficult-to-treat patients

Commenting on the study, Alan M. Rapoport, MD, clinical professor of neurology at University of California, Los Angeles, and past president of the International Headache Society, agreed that better options in migraine treatment and prevention are needed.

“We needed something that was going to be better than what we had before,” he said.

Dr. Rapoport noted the study was well designed with strongly positive results. “It looks like it’s an effective drug, and it looks really good in that it’s effective for people that have failed all these preventives that have very little hope for the future,” he said.

He specifically praised the inclusion of older participants in the population. “You never see a study on 80-year-olds,” he said, “but I like that, because they felt it would be safe. There are 80-year-old patients – fewer of them than 40-year-old patients – but there are 80-year-old patients who still have migraine, so I’m really glad they put older patients in it,” he said.

For atogepant, he noted that “some patients won’t get the side effects, and some patients will tolerate the side effects because it’s working really well.” While the study was not a head-to-head comparison against other oral migraine preventatives, he pointed out the high rate of constipation among participants in the trial setting may be a warning sign of future issues, as seen with other CGRP receptor agonists.

“I can tell you that with erenumab, the monoclonal antibody that was injected in the double-blind studies, they didn’t find any significant increase in constipation,” he explained. However, some clinicians using erenumab in the real world have reported up to 20% of their patients are constipated. “It’s not good that they’re reporting 10% are constipated” in the study, he said.

Overall, “all you can really say is it does work well,” Dr. Rapoport said. “It’s exciting that it works well in such difficult-to-treat patients, and it does come with some side effects.”

Dr. Pozo-Rosich reports serving as a consultant and developing education materials for AbbVie, Eli Lilly, Novartis, Teva Pharmaceuticals, and Pfizer. Dr. Rapoport is the editor-in-chief of Neurology Reviews; he reports being a consultant for AbbVie, the developer of atogepant. The ELEVATE trial is supported by AbbVie.

*Correction, 5/4/23: An earlier version of this article misstated the percentage of COVID-positive patients in the study population. 

BOSTON – Atogepant helped reduce the number of mean migraine days among adults with episodic migraine who failed multiple other oral migraine medications, according to findings from a study presented at the 2023 annual meeting of the American Academy of Neurology.

Initial results from the double-blind ELEVATE trial showed the oral atogepant group had significantly fewer mean monthly migraine days (MMD) compared with a placebo group. There was also a significant difference in the number of participants who achieved 50% or greater reduction in the number of mean MMDs and a significant reduction in acute medication use days compared with the placebo group, according to Patricia Pozo-Rosich, MD, PhD, a headache specialist in the neurology department and director of the headache and craniofacial pain clinical unit and the Migraine Adaptive Brain Center at the Vall d’Hebron University Hospital in Barcelona, and colleagues.

Vall d’Hebron University Hospital

The oral calcitonin gene-related peptide (CGRP) receptor antagonist is currently approved in the United States by the Food and Drug Administration as a preventative for both episodic and chronic migraine.
 

Results from ELEVATE

Overall, ELEVATE’s initial efficacy analysis population consisted of 309 adults aged between 18 and 80 years from North America and Europe with episodic migraine who had 4-14 MMDs and had treatment failure with at least two classes of conventional oral medication. After a 28-day screening period, participants received either 60 mg of oral atogepant once per day (154 participants) or a placebo (155 participants). In the efficacy analysis population, 56.0% of participants had failed two oral migraine preventative medication classes, while 44.0% failed three or more classes of medication. Dr. Pozo-Rosich noted that participants were taking a number of different oral preventatives across different medication classes, including flunarizine, beta blockers, topiramate, and amitriptyline, but data are not yet available on which participants had received certain combinations of oral medications.

“[T]hese people have already taken some type of prevention, so they’re not naive patients,” she said. “They’re usually more or less well treated in the sense of having had a contact with specialists or a general neurologist, someone that actually tries to do some prevention.”

The researchers examined change from MMDs at baseline and at 12 weeks as a primary outcome, with 50% or greater MMD reduction, change in mean monthly headache days, and change in acute medication use days as secondary outcomes. Regarding the different acute medications used, Dr. Pozo-Rosich said the main three types were analgesics, nonsteroid anti-inflammatory drugs, and triptans, with participants excluded from the trial if they were taking opioids.

The results showed participants in the atogepant group had significantly fewer mean MMDs compared with the placebo group at 12 weeks compared with baseline (–4.20 vs. –1.85 days; P < .0001). Researchers also found statistically significant improvement in the atogepant group for 50% or greater reduction in MMD, change in mean monthly headache days, and change in acute medication use days across 12 weeks of treatment compared with the placebo group. While the specific data analyses for secondary outcomes were not conducted in the initial analysis, Dr. Pozo-Rosich said the numbers “correlate with the primary outcome” as seen in other migraine trials.

Compared with the placebo group, participants in the atogepant group had higher rates of constipation (10.3% vs. 2.5%), COVID-19 (9.6% vs. 8.3%), and nausea (7.1% vs. 3.2%), while the placebo group had a higher rate of nasopharyngitis (5.1% vs. 7.6%).*

Migraine is a prevalent and undertreated disease, and patients around the world with migraine are in need of treatment options that are both safe and effective, Dr. Pozo-Rosich said in an interview. “[E]ven in these hard-to-treat or difficult-to-treat migraine patients, you have a drug that works, and is safe, and well tolerated and effective,” she said.

That’s “kind of good news for all of us,” she said. Patients “need this type of good news and solution,” she explained, because they may not tolerate or have access to injectable medications. Atogepant would also give clinicians have another option to offer patients with difficult-to-treat migraine cases, she noted. “It makes life easier for many physicians and many patients for many different reasons,” she said.

Dr. Pozo-Rosich said the likely next step in the research is to conduct the main analysis as well as post hoc analyses with accumulated data from pathology trials “to understand patterns of response, understand the sustainability of the response, [and] adherence to the treatment in the long term.”
 

‘Exciting that it works well’ in difficult-to-treat patients

Commenting on the study, Alan M. Rapoport, MD, clinical professor of neurology at University of California, Los Angeles, and past president of the International Headache Society, agreed that better options in migraine treatment and prevention are needed.

“We needed something that was going to be better than what we had before,” he said.

Dr. Rapoport noted the study was well designed with strongly positive results. “It looks like it’s an effective drug, and it looks really good in that it’s effective for people that have failed all these preventives that have very little hope for the future,” he said.

He specifically praised the inclusion of older participants in the population. “You never see a study on 80-year-olds,” he said, “but I like that, because they felt it would be safe. There are 80-year-old patients – fewer of them than 40-year-old patients – but there are 80-year-old patients who still have migraine, so I’m really glad they put older patients in it,” he said.

For atogepant, he noted that “some patients won’t get the side effects, and some patients will tolerate the side effects because it’s working really well.” While the study was not a head-to-head comparison against other oral migraine preventatives, he pointed out the high rate of constipation among participants in the trial setting may be a warning sign of future issues, as seen with other CGRP receptor agonists.

“I can tell you that with erenumab, the monoclonal antibody that was injected in the double-blind studies, they didn’t find any significant increase in constipation,” he explained. However, some clinicians using erenumab in the real world have reported up to 20% of their patients are constipated. “It’s not good that they’re reporting 10% are constipated” in the study, he said.

Overall, “all you can really say is it does work well,” Dr. Rapoport said. “It’s exciting that it works well in such difficult-to-treat patients, and it does come with some side effects.”

Dr. Pozo-Rosich reports serving as a consultant and developing education materials for AbbVie, Eli Lilly, Novartis, Teva Pharmaceuticals, and Pfizer. Dr. Rapoport is the editor-in-chief of Neurology Reviews; he reports being a consultant for AbbVie, the developer of atogepant. The ELEVATE trial is supported by AbbVie.

*Correction, 5/4/23: An earlier version of this article misstated the percentage of COVID-positive patients in the study population. 

BOSTON – Atogepant helped reduce the number of mean migraine days among adults with episodic migraine who failed multiple other oral migraine medications, according to findings from a study presented at the 2023 annual meeting of the American Academy of Neurology.

Initial results from the double-blind ELEVATE trial showed the oral atogepant group had significantly fewer mean monthly migraine days (MMD) compared with a placebo group. There was also a significant difference in the number of participants who achieved 50% or greater reduction in the number of mean MMDs and a significant reduction in acute medication use days compared with the placebo group, according to Patricia Pozo-Rosich, MD, PhD, a headache specialist in the neurology department and director of the headache and craniofacial pain clinical unit and the Migraine Adaptive Brain Center at the Vall d’Hebron University Hospital in Barcelona, and colleagues.

Vall d’Hebron University Hospital

The oral calcitonin gene-related peptide (CGRP) receptor antagonist is currently approved in the United States by the Food and Drug Administration as a preventative for both episodic and chronic migraine.
 

Results from ELEVATE

Overall, ELEVATE’s initial efficacy analysis population consisted of 309 adults aged between 18 and 80 years from North America and Europe with episodic migraine who had 4-14 MMDs and had treatment failure with at least two classes of conventional oral medication. After a 28-day screening period, participants received either 60 mg of oral atogepant once per day (154 participants) or a placebo (155 participants). In the efficacy analysis population, 56.0% of participants had failed two oral migraine preventative medication classes, while 44.0% failed three or more classes of medication. Dr. Pozo-Rosich noted that participants were taking a number of different oral preventatives across different medication classes, including flunarizine, beta blockers, topiramate, and amitriptyline, but data are not yet available on which participants had received certain combinations of oral medications.

“[T]hese people have already taken some type of prevention, so they’re not naive patients,” she said. “They’re usually more or less well treated in the sense of having had a contact with specialists or a general neurologist, someone that actually tries to do some prevention.”

The researchers examined change from MMDs at baseline and at 12 weeks as a primary outcome, with 50% or greater MMD reduction, change in mean monthly headache days, and change in acute medication use days as secondary outcomes. Regarding the different acute medications used, Dr. Pozo-Rosich said the main three types were analgesics, nonsteroid anti-inflammatory drugs, and triptans, with participants excluded from the trial if they were taking opioids.

The results showed participants in the atogepant group had significantly fewer mean MMDs compared with the placebo group at 12 weeks compared with baseline (–4.20 vs. –1.85 days; P < .0001). Researchers also found statistically significant improvement in the atogepant group for 50% or greater reduction in MMD, change in mean monthly headache days, and change in acute medication use days across 12 weeks of treatment compared with the placebo group. While the specific data analyses for secondary outcomes were not conducted in the initial analysis, Dr. Pozo-Rosich said the numbers “correlate with the primary outcome” as seen in other migraine trials.

Compared with the placebo group, participants in the atogepant group had higher rates of constipation (10.3% vs. 2.5%), COVID-19 (9.6% vs. 8.3%), and nausea (7.1% vs. 3.2%), while the placebo group had a higher rate of nasopharyngitis (5.1% vs. 7.6%).*

Migraine is a prevalent and undertreated disease, and patients around the world with migraine are in need of treatment options that are both safe and effective, Dr. Pozo-Rosich said in an interview. “[E]ven in these hard-to-treat or difficult-to-treat migraine patients, you have a drug that works, and is safe, and well tolerated and effective,” she said.

That’s “kind of good news for all of us,” she said. Patients “need this type of good news and solution,” she explained, because they may not tolerate or have access to injectable medications. Atogepant would also give clinicians have another option to offer patients with difficult-to-treat migraine cases, she noted. “It makes life easier for many physicians and many patients for many different reasons,” she said.

Dr. Pozo-Rosich said the likely next step in the research is to conduct the main analysis as well as post hoc analyses with accumulated data from pathology trials “to understand patterns of response, understand the sustainability of the response, [and] adherence to the treatment in the long term.”
 

‘Exciting that it works well’ in difficult-to-treat patients

Commenting on the study, Alan M. Rapoport, MD, clinical professor of neurology at University of California, Los Angeles, and past president of the International Headache Society, agreed that better options in migraine treatment and prevention are needed.

“We needed something that was going to be better than what we had before,” he said.

Dr. Rapoport noted the study was well designed with strongly positive results. “It looks like it’s an effective drug, and it looks really good in that it’s effective for people that have failed all these preventives that have very little hope for the future,” he said.

He specifically praised the inclusion of older participants in the population. “You never see a study on 80-year-olds,” he said, “but I like that, because they felt it would be safe. There are 80-year-old patients – fewer of them than 40-year-old patients – but there are 80-year-old patients who still have migraine, so I’m really glad they put older patients in it,” he said.

For atogepant, he noted that “some patients won’t get the side effects, and some patients will tolerate the side effects because it’s working really well.” While the study was not a head-to-head comparison against other oral migraine preventatives, he pointed out the high rate of constipation among participants in the trial setting may be a warning sign of future issues, as seen with other CGRP receptor agonists.

“I can tell you that with erenumab, the monoclonal antibody that was injected in the double-blind studies, they didn’t find any significant increase in constipation,” he explained. However, some clinicians using erenumab in the real world have reported up to 20% of their patients are constipated. “It’s not good that they’re reporting 10% are constipated” in the study, he said.

Overall, “all you can really say is it does work well,” Dr. Rapoport said. “It’s exciting that it works well in such difficult-to-treat patients, and it does come with some side effects.”

Dr. Pozo-Rosich reports serving as a consultant and developing education materials for AbbVie, Eli Lilly, Novartis, Teva Pharmaceuticals, and Pfizer. Dr. Rapoport is the editor-in-chief of Neurology Reviews; he reports being a consultant for AbbVie, the developer of atogepant. The ELEVATE trial is supported by AbbVie.

*Correction, 5/4/23: An earlier version of this article misstated the percentage of COVID-positive patients in the study population. 

“BMI is trash. Full stop.” This controversial tweet, which received thousands of likes and retweets, was cited in a recent article by one doctor on when physicians might stop using body mass index (BMI) to diagnose obesity.

BMI has for years been the consensus default method for assessing whether a person is overweight or has obesity, and is still widely used as the gatekeeper metric for treatment eligibility for certain weight-loss agents and bariatric surgery.

But growing appreciation of the limitations of BMI is causing many clinicians to consider alternative measures of obesity that can better assess both the amount of adiposity as well as its body location, an important determinant of the cardiometabolic consequences of fat.

Alternative metrics include waist circumference and/or waist-to-height ratio (WHtR); imaging methods such as CT, MRI, and dual-energy x-ray absorptiometry (DXA); and bioelectrical impedance to assess fat volume and location. All have made some inroads on the tight grip BMI has had on obesity assessment.

Chances are, however, that BMI will not fade away anytime soon given how entrenched it has become in clinical practice and for insurance coverage, as well as its relative simplicity and precision.

“BMI is embedded in a wide range of guidelines on the use of medications and surgery. It’s embedded in Food and Drug Administration regulations and for billing and insurance coverage. It would take extremely strong data and years of work to undo the infrastructure built around BMI and replace it with something else. I don’t see that happening [anytime soon],” commented Daniel H. Bessesen, MD, a professor at the University of Colorado at Denver, Aurora, and chief of endocrinology for Denver Health.

“It would be almost impossible to replace all the studies that have used BMI with investigations using some other measure,” he said.
 

BMI Is ‘imperfect’

The entrenched position of BMI as the go-to metric doesn’t keep detractors from weighing in. As noted in a commentary on current clinical challenges surrounding obesity recently published in Annals of Internal Medicine, the journal’s editor-in-chief, Christine Laine, MD, and senior deputy editor Christina C. Wee, MD, listed six top issues clinicians must deal with, one of which, they say, is the need for a better measure of obesity than BMI.

“Unfortunately, BMI is an imperfect measure of body composition that differs with ethnicity, sex, body frame, and muscle mass,” noted Dr. Laine and Dr. Wee.

BMI is based on a person’s weight in kilograms divided by the square of their height in meters. A “healthy” BMI is between 18.5 and 24.9 kg/m2, overweight is 25-29.9, and 30 or greater is considered to represent obesity. However, certain ethnic groups have lower cutoffs for overweight or obesity because of evidence that such individuals can be at higher risk of obesity-related comorbidities at lower BMIs.

“BMI was chosen as the initial screening tool [for obesity] not because anyone thought it was perfect or the best measure but because of its simplicity. All you need is height, weight, and a calculator,” Dr. Wee said in an interview.

Numerous online calculators are available, including one from the Centers for Disease Control and Prevention where height in feet and inches and weight in pounds can be entered to generate the BMI.

BMI is also inherently limited by being “a proxy for adiposity” and not a direct measure, added Dr. Wee, who is also director of the Obesity Research Program of Beth Israel Deaconess Medical Center, Boston.

As such, BMI can’t distinguish between fat and muscle because it relies on weight only to gauge adiposity, noted Tiffany Powell-Wiley, MD, an obesity researcher at the National Heart, Lung, and Blood Institute in Bethesda, Md. Another shortcoming of BMI is that it “is good for distinguishing population-level risk for cardiovascular disease and other chronic diseases, but it does not help as much for distinguishing risk at an individual level,” she said in an interview.

These and other drawbacks have prompted researchers to look for other useful metrics. WHtR, for example, has recently made headway as a potential BMI alternative or complement.
 

The case for WHtR

Concern about overreliance on BMI despite its limitations is not new. In 2015, an American Heart Association scientific statement from the group’s Obesity Committee concluded that “BMI alone, even with lower thresholds, is a useful but not an ideal tool for identification of obesity or assessment of cardiovascular risk,” especially for people from Asian, Black, Hispanic, and Pacific Islander populations.

The writing panel also recommended that clinicians measure waist circumference annually and use that information along with BMI “to better gauge cardiovascular risk in diverse populations.”

Momentum for moving beyond BMI alone has continued to build following the AHA statement.

In September 2022, the National Institute for Health and Care Excellence, which sets policies for the United Kingdom’s National Health Service, revised its guidancefor assessment and management of people with obesity. The updated guidance recommends that when clinicians assess “adults with BMI below 35 kg/m2, measure and use their WHtR, as well as their BMI, as a practical estimate of central adiposity and use these measurements to help to assess and predict health risks.”

NICE released an extensive literature review with the revision, and based on the evidence, said that “using waist-to-height ratio as well as BMI would help give a practical estimate of central adiposity in adults with BMI under 35 kg/m². This would in turn help professionals assess and predict health risks.”

However, the review added that, “because people with a BMI over 35 kg/m² are always likely to have a high WHtR, the committee recognized that it may not be a useful addition for predicting health risks in this group.” The 2022 NICE review also said that it is “important to estimate central adiposity when assessing future health risks, including for people whose BMI is in the healthy-weight category.”

This new emphasis by NICE on measuring and using WHtR as part of obesity assessment “represents an important change in population health policy,” commented Dr. Powell-Wiley. “I expect more professional organizations will endorse use of waist circumference or waist-to-height ratio now that NICE has taken this step,” she predicted.

Waist circumference and WHtR may become standard measures of adiposity in clinical practice over the next 5-10 years.

The recent move by NICE to highlight a complementary role for WHtR “is another acknowledgment that BMI is an imperfect tool for stratifying cardiometabolic risk in a diverse population, especially in people with lower BMIs” because of its variability, commented Jamie Almandoz, MD, medical director of the weight wellness program at UT Southwestern Medical Center, Dallas.
 

WHtR vs. BMI

Another recent step forward for WHtR came with the publication of a post hoc analysis of data collected in the PARADIGM-HF trial, a study that had the primary purpose of comparing two medications for improving outcomes in more than 8,000 patients with heart failure with reduced ejection fraction.

The new analysis showed that “two indices that incorporate waist circumference and height, but not weight, showed a clearer association between greater adiposity and a higher risk of heart failure hospitalization,” compared with BMI.

WHtR was one of the two indices identified as being a better correlate for the adverse effect of excess adiposity compared with BMI.

The authors of the post hoc analysis did not design their analysis to compare WHtR with BMI. Instead, their goal was to better understand what’s known as the “obesity paradox” in people with heart failure with reduced ejection fraction: The recurring observation that, when these patients with heart failure have lower BMIs they fare worse, with higher rates of mortality and adverse cardiovascular outcomes, compared with patients with higher BMIs.

The new analysis showed that this paradox disappeared when WHtR was substituted for BMI as the obesity metric.

This “provides meaningful data about the superiority of WHtR, compared with BMI, for predicting heart failure outcomes,” said Dr. Powell-Wiley, although she cautioned that the analysis was limited by scant data in diverse populations and did not look at other important cardiovascular disease outcomes. While Dr. Powell-Wiley does not think that WHtR needs assessment in a prospective, controlled trial, she called for analysis of pooled prospective studies with more diverse populations to better document the advantages of WHtR over BMI.

The PARADIGM-HF post hoc analysis shows again how flawed BMI is for health assessment and the relative importance of an individualized understanding of a person’s body composition, Dr. Almandoz said in an interview. “As we collect more data, there is increasing awareness of how imperfect BMI is.”
 

Measuring waist circumference is tricky

Although WHtR looks promising as a substitute for or add-on to BMI, it has its own limitations, particularly the challenge of accurately measuring waist circumference.

Measuring waist circumference “not only takes more time but requires the assessor to be well trained about where to put the tape measure and making sure it’s measured at the same place each time,” even when different people take serial measurements from individual patients, noted Dr. Wee. Determining waist circumference can also be technically difficult when done on larger people, she added, and collectively these challenges make waist circumference “less reproducible from measurement to measurement.”

“It’s relatively clear how to standardize measurement of weight and height, but there is a huge amount of variability when the waist is measured,” agreed Dr. Almandoz. “And waist circumference also differs by ethnicity, race, sex, and body frame. There are significant differences in waist circumference levels that associate with increased health risks” between, for example, White and South Asian people.

Another limitation of waist circumference and WHtR is that they “cannot differentiate between visceral and abdominal subcutaneous adipose tissue, which are vastly different regarding cardiometabolic risk, commented Ian Neeland, MD, director of cardiovascular prevention at the University Hospitals Harrington Heart & Vascular Institute, Cleveland.
 

The imaging option

“Waist-to-height ratio is not the ultimate answer,” Dr. Neeland said in an interview. He instead endorsed “advanced imaging for body fat distribution,” such as CT or MRI scans, as his pick for what should be the standard obesity metric, “given that it is much more specific and actionable for both risk assessment and response to therapy. I expect slow but steady advancements that move away from BMI cutoffs, for example for bariatric surgery, given that BMI is an imprecise and crude tool.”

But although imaging with methods like CT and MRI may provide the best accuracy and precision for tracking the volume of a person’s cardiometabolically dangerous fat, they are also hampered by relatively high cost and, for CT and DXA, the issue of radiation exposure.

“CT, MRI, and DXA scans give more in-depth assessment of body composition, but should we expose people to the radiation and the cost?” Dr. Almandoz wondered.

“Height, weight, and waist circumference cost nothing to obtain,” creating a big relative disadvantage for imaging, said Naveed Sattar, MD, professor of metabolic medicine at the University of Glasgow.

“Data would need to show that imaging gives clinicians substantially more information about future risk” to justify its price, Dr. Sattar emphasized.
 

BMI’s limits mean adding on

Regardless of whichever alternatives to BMI end up getting used most, experts generally agree that BMI alone is looking increasingly inadequate.

“Over the next 5 years, BMI will come to be seen as a screening tool that categorizes people into general risk groups” that also needs “other metrics and variables, such as age, race, ethnicity, family history, blood glucose, and blood pressure to better describe health risk in an individual,” predicted Dr. Bessesen.

The endorsement of WHtR by NICE “will lead to more research into how to incorporate WHtR into routine practice. We need more evidence to translate what NICE said into practice,” said Dr. Sattar. “I don’t think we’ll see a shift away from BMI, but we’ll add alternative measures that are particularly useful in certain patients.”

“Because we live in diverse societies, we need to individualize risk assessment and couple that with technology that makes analysis of body composition more accessible,” agreed Dr. Almandoz. He noted that the UT Southwestern weight wellness program where he practices has, for about the past decade, routinely collected waist circumference and bioelectrical impedance data as well as BMI on all people seen in the practice for obesity concerns. Making these additional measurements on a routine basis also helps strengthen patient engagement.

“We get into trouble when we make rigid health policy and clinical decisions based on BMI alone without looking at the patient holistically,” said Dr. Wee. “Patients are more than arbitrary numbers, and clinicians should make clinical decisions based on the totality of evidence for each individual patient.”

Dr. Bessesen, Dr. Wee, Dr. Powell-Wiley, and Dr. Almandoz reported no relevant financial relationships. Dr. Neeland has reported being a consultant for Merck. Dr. Sattar has reported being a consultant or speaker for Abbott Laboratories, Afimmune, Amgen, AstraZeneca, Boehringer Ingelheim, Eli Lilly, Hanmi Pharmaceuticals, Janssen, MSD, Novartis, Novo Nordisk, Pfizer, Roche Diagnostics, and Sanofi.

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

“BMI is trash. Full stop.” This controversial tweet, which received thousands of likes and retweets, was cited in a recent article by one doctor on when physicians might stop using body mass index (BMI) to diagnose obesity.

BMI has for years been the consensus default method for assessing whether a person is overweight or has obesity, and is still widely used as the gatekeeper metric for treatment eligibility for certain weight-loss agents and bariatric surgery.

But growing appreciation of the limitations of BMI is causing many clinicians to consider alternative measures of obesity that can better assess both the amount of adiposity as well as its body location, an important determinant of the cardiometabolic consequences of fat.

Alternative metrics include waist circumference and/or waist-to-height ratio (WHtR); imaging methods such as CT, MRI, and dual-energy x-ray absorptiometry (DXA); and bioelectrical impedance to assess fat volume and location. All have made some inroads on the tight grip BMI has had on obesity assessment.

Chances are, however, that BMI will not fade away anytime soon given how entrenched it has become in clinical practice and for insurance coverage, as well as its relative simplicity and precision.

“BMI is embedded in a wide range of guidelines on the use of medications and surgery. It’s embedded in Food and Drug Administration regulations and for billing and insurance coverage. It would take extremely strong data and years of work to undo the infrastructure built around BMI and replace it with something else. I don’t see that happening [anytime soon],” commented Daniel H. Bessesen, MD, a professor at the University of Colorado at Denver, Aurora, and chief of endocrinology for Denver Health.

“It would be almost impossible to replace all the studies that have used BMI with investigations using some other measure,” he said.
 

BMI Is ‘imperfect’

The entrenched position of BMI as the go-to metric doesn’t keep detractors from weighing in. As noted in a commentary on current clinical challenges surrounding obesity recently published in Annals of Internal Medicine, the journal’s editor-in-chief, Christine Laine, MD, and senior deputy editor Christina C. Wee, MD, listed six top issues clinicians must deal with, one of which, they say, is the need for a better measure of obesity than BMI.

“Unfortunately, BMI is an imperfect measure of body composition that differs with ethnicity, sex, body frame, and muscle mass,” noted Dr. Laine and Dr. Wee.

BMI is based on a person’s weight in kilograms divided by the square of their height in meters. A “healthy” BMI is between 18.5 and 24.9 kg/m2, overweight is 25-29.9, and 30 or greater is considered to represent obesity. However, certain ethnic groups have lower cutoffs for overweight or obesity because of evidence that such individuals can be at higher risk of obesity-related comorbidities at lower BMIs.

“BMI was chosen as the initial screening tool [for obesity] not because anyone thought it was perfect or the best measure but because of its simplicity. All you need is height, weight, and a calculator,” Dr. Wee said in an interview.

Numerous online calculators are available, including one from the Centers for Disease Control and Prevention where height in feet and inches and weight in pounds can be entered to generate the BMI.

BMI is also inherently limited by being “a proxy for adiposity” and not a direct measure, added Dr. Wee, who is also director of the Obesity Research Program of Beth Israel Deaconess Medical Center, Boston.

As such, BMI can’t distinguish between fat and muscle because it relies on weight only to gauge adiposity, noted Tiffany Powell-Wiley, MD, an obesity researcher at the National Heart, Lung, and Blood Institute in Bethesda, Md. Another shortcoming of BMI is that it “is good for distinguishing population-level risk for cardiovascular disease and other chronic diseases, but it does not help as much for distinguishing risk at an individual level,” she said in an interview.

These and other drawbacks have prompted researchers to look for other useful metrics. WHtR, for example, has recently made headway as a potential BMI alternative or complement.
 

The case for WHtR

Concern about overreliance on BMI despite its limitations is not new. In 2015, an American Heart Association scientific statement from the group’s Obesity Committee concluded that “BMI alone, even with lower thresholds, is a useful but not an ideal tool for identification of obesity or assessment of cardiovascular risk,” especially for people from Asian, Black, Hispanic, and Pacific Islander populations.

The writing panel also recommended that clinicians measure waist circumference annually and use that information along with BMI “to better gauge cardiovascular risk in diverse populations.”

Momentum for moving beyond BMI alone has continued to build following the AHA statement.

In September 2022, the National Institute for Health and Care Excellence, which sets policies for the United Kingdom’s National Health Service, revised its guidancefor assessment and management of people with obesity. The updated guidance recommends that when clinicians assess “adults with BMI below 35 kg/m2, measure and use their WHtR, as well as their BMI, as a practical estimate of central adiposity and use these measurements to help to assess and predict health risks.”

NICE released an extensive literature review with the revision, and based on the evidence, said that “using waist-to-height ratio as well as BMI would help give a practical estimate of central adiposity in adults with BMI under 35 kg/m². This would in turn help professionals assess and predict health risks.”

However, the review added that, “because people with a BMI over 35 kg/m² are always likely to have a high WHtR, the committee recognized that it may not be a useful addition for predicting health risks in this group.” The 2022 NICE review also said that it is “important to estimate central adiposity when assessing future health risks, including for people whose BMI is in the healthy-weight category.”

This new emphasis by NICE on measuring and using WHtR as part of obesity assessment “represents an important change in population health policy,” commented Dr. Powell-Wiley. “I expect more professional organizations will endorse use of waist circumference or waist-to-height ratio now that NICE has taken this step,” she predicted.

Waist circumference and WHtR may become standard measures of adiposity in clinical practice over the next 5-10 years.

The recent move by NICE to highlight a complementary role for WHtR “is another acknowledgment that BMI is an imperfect tool for stratifying cardiometabolic risk in a diverse population, especially in people with lower BMIs” because of its variability, commented Jamie Almandoz, MD, medical director of the weight wellness program at UT Southwestern Medical Center, Dallas.
 

WHtR vs. BMI

Another recent step forward for WHtR came with the publication of a post hoc analysis of data collected in the PARADIGM-HF trial, a study that had the primary purpose of comparing two medications for improving outcomes in more than 8,000 patients with heart failure with reduced ejection fraction.

The new analysis showed that “two indices that incorporate waist circumference and height, but not weight, showed a clearer association between greater adiposity and a higher risk of heart failure hospitalization,” compared with BMI.

WHtR was one of the two indices identified as being a better correlate for the adverse effect of excess adiposity compared with BMI.

The authors of the post hoc analysis did not design their analysis to compare WHtR with BMI. Instead, their goal was to better understand what’s known as the “obesity paradox” in people with heart failure with reduced ejection fraction: The recurring observation that, when these patients with heart failure have lower BMIs they fare worse, with higher rates of mortality and adverse cardiovascular outcomes, compared with patients with higher BMIs.

The new analysis showed that this paradox disappeared when WHtR was substituted for BMI as the obesity metric.

This “provides meaningful data about the superiority of WHtR, compared with BMI, for predicting heart failure outcomes,” said Dr. Powell-Wiley, although she cautioned that the analysis was limited by scant data in diverse populations and did not look at other important cardiovascular disease outcomes. While Dr. Powell-Wiley does not think that WHtR needs assessment in a prospective, controlled trial, she called for analysis of pooled prospective studies with more diverse populations to better document the advantages of WHtR over BMI.

The PARADIGM-HF post hoc analysis shows again how flawed BMI is for health assessment and the relative importance of an individualized understanding of a person’s body composition, Dr. Almandoz said in an interview. “As we collect more data, there is increasing awareness of how imperfect BMI is.”
 

Measuring waist circumference is tricky

Although WHtR looks promising as a substitute for or add-on to BMI, it has its own limitations, particularly the challenge of accurately measuring waist circumference.

Measuring waist circumference “not only takes more time but requires the assessor to be well trained about where to put the tape measure and making sure it’s measured at the same place each time,” even when different people take serial measurements from individual patients, noted Dr. Wee. Determining waist circumference can also be technically difficult when done on larger people, she added, and collectively these challenges make waist circumference “less reproducible from measurement to measurement.”

“It’s relatively clear how to standardize measurement of weight and height, but there is a huge amount of variability when the waist is measured,” agreed Dr. Almandoz. “And waist circumference also differs by ethnicity, race, sex, and body frame. There are significant differences in waist circumference levels that associate with increased health risks” between, for example, White and South Asian people.

Another limitation of waist circumference and WHtR is that they “cannot differentiate between visceral and abdominal subcutaneous adipose tissue, which are vastly different regarding cardiometabolic risk, commented Ian Neeland, MD, director of cardiovascular prevention at the University Hospitals Harrington Heart & Vascular Institute, Cleveland.
 

The imaging option

“Waist-to-height ratio is not the ultimate answer,” Dr. Neeland said in an interview. He instead endorsed “advanced imaging for body fat distribution,” such as CT or MRI scans, as his pick for what should be the standard obesity metric, “given that it is much more specific and actionable for both risk assessment and response to therapy. I expect slow but steady advancements that move away from BMI cutoffs, for example for bariatric surgery, given that BMI is an imprecise and crude tool.”

But although imaging with methods like CT and MRI may provide the best accuracy and precision for tracking the volume of a person’s cardiometabolically dangerous fat, they are also hampered by relatively high cost and, for CT and DXA, the issue of radiation exposure.

“CT, MRI, and DXA scans give more in-depth assessment of body composition, but should we expose people to the radiation and the cost?” Dr. Almandoz wondered.

“Height, weight, and waist circumference cost nothing to obtain,” creating a big relative disadvantage for imaging, said Naveed Sattar, MD, professor of metabolic medicine at the University of Glasgow.

“Data would need to show that imaging gives clinicians substantially more information about future risk” to justify its price, Dr. Sattar emphasized.
 

BMI’s limits mean adding on

Regardless of whichever alternatives to BMI end up getting used most, experts generally agree that BMI alone is looking increasingly inadequate.

“Over the next 5 years, BMI will come to be seen as a screening tool that categorizes people into general risk groups” that also needs “other metrics and variables, such as age, race, ethnicity, family history, blood glucose, and blood pressure to better describe health risk in an individual,” predicted Dr. Bessesen.

The endorsement of WHtR by NICE “will lead to more research into how to incorporate WHtR into routine practice. We need more evidence to translate what NICE said into practice,” said Dr. Sattar. “I don’t think we’ll see a shift away from BMI, but we’ll add alternative measures that are particularly useful in certain patients.”

“Because we live in diverse societies, we need to individualize risk assessment and couple that with technology that makes analysis of body composition more accessible,” agreed Dr. Almandoz. He noted that the UT Southwestern weight wellness program where he practices has, for about the past decade, routinely collected waist circumference and bioelectrical impedance data as well as BMI on all people seen in the practice for obesity concerns. Making these additional measurements on a routine basis also helps strengthen patient engagement.

“We get into trouble when we make rigid health policy and clinical decisions based on BMI alone without looking at the patient holistically,” said Dr. Wee. “Patients are more than arbitrary numbers, and clinicians should make clinical decisions based on the totality of evidence for each individual patient.”

Dr. Bessesen, Dr. Wee, Dr. Powell-Wiley, and Dr. Almandoz reported no relevant financial relationships. Dr. Neeland has reported being a consultant for Merck. Dr. Sattar has reported being a consultant or speaker for Abbott Laboratories, Afimmune, Amgen, AstraZeneca, Boehringer Ingelheim, Eli Lilly, Hanmi Pharmaceuticals, Janssen, MSD, Novartis, Novo Nordisk, Pfizer, Roche Diagnostics, and Sanofi.

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

“BMI is trash. Full stop.” This controversial tweet, which received thousands of likes and retweets, was cited in a recent article by one doctor on when physicians might stop using body mass index (BMI) to diagnose obesity.

BMI has for years been the consensus default method for assessing whether a person is overweight or has obesity, and is still widely used as the gatekeeper metric for treatment eligibility for certain weight-loss agents and bariatric surgery.

But growing appreciation of the limitations of BMI is causing many clinicians to consider alternative measures of obesity that can better assess both the amount of adiposity as well as its body location, an important determinant of the cardiometabolic consequences of fat.

Alternative metrics include waist circumference and/or waist-to-height ratio (WHtR); imaging methods such as CT, MRI, and dual-energy x-ray absorptiometry (DXA); and bioelectrical impedance to assess fat volume and location. All have made some inroads on the tight grip BMI has had on obesity assessment.

Chances are, however, that BMI will not fade away anytime soon given how entrenched it has become in clinical practice and for insurance coverage, as well as its relative simplicity and precision.

“BMI is embedded in a wide range of guidelines on the use of medications and surgery. It’s embedded in Food and Drug Administration regulations and for billing and insurance coverage. It would take extremely strong data and years of work to undo the infrastructure built around BMI and replace it with something else. I don’t see that happening [anytime soon],” commented Daniel H. Bessesen, MD, a professor at the University of Colorado at Denver, Aurora, and chief of endocrinology for Denver Health.

“It would be almost impossible to replace all the studies that have used BMI with investigations using some other measure,” he said.
 

BMI Is ‘imperfect’

The entrenched position of BMI as the go-to metric doesn’t keep detractors from weighing in. As noted in a commentary on current clinical challenges surrounding obesity recently published in Annals of Internal Medicine, the journal’s editor-in-chief, Christine Laine, MD, and senior deputy editor Christina C. Wee, MD, listed six top issues clinicians must deal with, one of which, they say, is the need for a better measure of obesity than BMI.

“Unfortunately, BMI is an imperfect measure of body composition that differs with ethnicity, sex, body frame, and muscle mass,” noted Dr. Laine and Dr. Wee.

BMI is based on a person’s weight in kilograms divided by the square of their height in meters. A “healthy” BMI is between 18.5 and 24.9 kg/m2, overweight is 25-29.9, and 30 or greater is considered to represent obesity. However, certain ethnic groups have lower cutoffs for overweight or obesity because of evidence that such individuals can be at higher risk of obesity-related comorbidities at lower BMIs.

“BMI was chosen as the initial screening tool [for obesity] not because anyone thought it was perfect or the best measure but because of its simplicity. All you need is height, weight, and a calculator,” Dr. Wee said in an interview.

Numerous online calculators are available, including one from the Centers for Disease Control and Prevention where height in feet and inches and weight in pounds can be entered to generate the BMI.

BMI is also inherently limited by being “a proxy for adiposity” and not a direct measure, added Dr. Wee, who is also director of the Obesity Research Program of Beth Israel Deaconess Medical Center, Boston.

As such, BMI can’t distinguish between fat and muscle because it relies on weight only to gauge adiposity, noted Tiffany Powell-Wiley, MD, an obesity researcher at the National Heart, Lung, and Blood Institute in Bethesda, Md. Another shortcoming of BMI is that it “is good for distinguishing population-level risk for cardiovascular disease and other chronic diseases, but it does not help as much for distinguishing risk at an individual level,” she said in an interview.

These and other drawbacks have prompted researchers to look for other useful metrics. WHtR, for example, has recently made headway as a potential BMI alternative or complement.
 

The case for WHtR

Concern about overreliance on BMI despite its limitations is not new. In 2015, an American Heart Association scientific statement from the group’s Obesity Committee concluded that “BMI alone, even with lower thresholds, is a useful but not an ideal tool for identification of obesity or assessment of cardiovascular risk,” especially for people from Asian, Black, Hispanic, and Pacific Islander populations.

The writing panel also recommended that clinicians measure waist circumference annually and use that information along with BMI “to better gauge cardiovascular risk in diverse populations.”

Momentum for moving beyond BMI alone has continued to build following the AHA statement.

In September 2022, the National Institute for Health and Care Excellence, which sets policies for the United Kingdom’s National Health Service, revised its guidancefor assessment and management of people with obesity. The updated guidance recommends that when clinicians assess “adults with BMI below 35 kg/m2, measure and use their WHtR, as well as their BMI, as a practical estimate of central adiposity and use these measurements to help to assess and predict health risks.”

NICE released an extensive literature review with the revision, and based on the evidence, said that “using waist-to-height ratio as well as BMI would help give a practical estimate of central adiposity in adults with BMI under 35 kg/m². This would in turn help professionals assess and predict health risks.”

However, the review added that, “because people with a BMI over 35 kg/m² are always likely to have a high WHtR, the committee recognized that it may not be a useful addition for predicting health risks in this group.” The 2022 NICE review also said that it is “important to estimate central adiposity when assessing future health risks, including for people whose BMI is in the healthy-weight category.”

This new emphasis by NICE on measuring and using WHtR as part of obesity assessment “represents an important change in population health policy,” commented Dr. Powell-Wiley. “I expect more professional organizations will endorse use of waist circumference or waist-to-height ratio now that NICE has taken this step,” she predicted.

Waist circumference and WHtR may become standard measures of adiposity in clinical practice over the next 5-10 years.

The recent move by NICE to highlight a complementary role for WHtR “is another acknowledgment that BMI is an imperfect tool for stratifying cardiometabolic risk in a diverse population, especially in people with lower BMIs” because of its variability, commented Jamie Almandoz, MD, medical director of the weight wellness program at UT Southwestern Medical Center, Dallas.
 

WHtR vs. BMI

Another recent step forward for WHtR came with the publication of a post hoc analysis of data collected in the PARADIGM-HF trial, a study that had the primary purpose of comparing two medications for improving outcomes in more than 8,000 patients with heart failure with reduced ejection fraction.

The new analysis showed that “two indices that incorporate waist circumference and height, but not weight, showed a clearer association between greater adiposity and a higher risk of heart failure hospitalization,” compared with BMI.

WHtR was one of the two indices identified as being a better correlate for the adverse effect of excess adiposity compared with BMI.

The authors of the post hoc analysis did not design their analysis to compare WHtR with BMI. Instead, their goal was to better understand what’s known as the “obesity paradox” in people with heart failure with reduced ejection fraction: The recurring observation that, when these patients with heart failure have lower BMIs they fare worse, with higher rates of mortality and adverse cardiovascular outcomes, compared with patients with higher BMIs.

The new analysis showed that this paradox disappeared when WHtR was substituted for BMI as the obesity metric.

This “provides meaningful data about the superiority of WHtR, compared with BMI, for predicting heart failure outcomes,” said Dr. Powell-Wiley, although she cautioned that the analysis was limited by scant data in diverse populations and did not look at other important cardiovascular disease outcomes. While Dr. Powell-Wiley does not think that WHtR needs assessment in a prospective, controlled trial, she called for analysis of pooled prospective studies with more diverse populations to better document the advantages of WHtR over BMI.

The PARADIGM-HF post hoc analysis shows again how flawed BMI is for health assessment and the relative importance of an individualized understanding of a person’s body composition, Dr. Almandoz said in an interview. “As we collect more data, there is increasing awareness of how imperfect BMI is.”
 

Measuring waist circumference is tricky

Although WHtR looks promising as a substitute for or add-on to BMI, it has its own limitations, particularly the challenge of accurately measuring waist circumference.

Measuring waist circumference “not only takes more time but requires the assessor to be well trained about where to put the tape measure and making sure it’s measured at the same place each time,” even when different people take serial measurements from individual patients, noted Dr. Wee. Determining waist circumference can also be technically difficult when done on larger people, she added, and collectively these challenges make waist circumference “less reproducible from measurement to measurement.”

“It’s relatively clear how to standardize measurement of weight and height, but there is a huge amount of variability when the waist is measured,” agreed Dr. Almandoz. “And waist circumference also differs by ethnicity, race, sex, and body frame. There are significant differences in waist circumference levels that associate with increased health risks” between, for example, White and South Asian people.

Another limitation of waist circumference and WHtR is that they “cannot differentiate between visceral and abdominal subcutaneous adipose tissue, which are vastly different regarding cardiometabolic risk, commented Ian Neeland, MD, director of cardiovascular prevention at the University Hospitals Harrington Heart & Vascular Institute, Cleveland.
 

The imaging option

“Waist-to-height ratio is not the ultimate answer,” Dr. Neeland said in an interview. He instead endorsed “advanced imaging for body fat distribution,” such as CT or MRI scans, as his pick for what should be the standard obesity metric, “given that it is much more specific and actionable for both risk assessment and response to therapy. I expect slow but steady advancements that move away from BMI cutoffs, for example for bariatric surgery, given that BMI is an imprecise and crude tool.”

But although imaging with methods like CT and MRI may provide the best accuracy and precision for tracking the volume of a person’s cardiometabolically dangerous fat, they are also hampered by relatively high cost and, for CT and DXA, the issue of radiation exposure.

“CT, MRI, and DXA scans give more in-depth assessment of body composition, but should we expose people to the radiation and the cost?” Dr. Almandoz wondered.

“Height, weight, and waist circumference cost nothing to obtain,” creating a big relative disadvantage for imaging, said Naveed Sattar, MD, professor of metabolic medicine at the University of Glasgow.

“Data would need to show that imaging gives clinicians substantially more information about future risk” to justify its price, Dr. Sattar emphasized.
 

BMI’s limits mean adding on

Regardless of whichever alternatives to BMI end up getting used most, experts generally agree that BMI alone is looking increasingly inadequate.

“Over the next 5 years, BMI will come to be seen as a screening tool that categorizes people into general risk groups” that also needs “other metrics and variables, such as age, race, ethnicity, family history, blood glucose, and blood pressure to better describe health risk in an individual,” predicted Dr. Bessesen.

The endorsement of WHtR by NICE “will lead to more research into how to incorporate WHtR into routine practice. We need more evidence to translate what NICE said into practice,” said Dr. Sattar. “I don’t think we’ll see a shift away from BMI, but we’ll add alternative measures that are particularly useful in certain patients.”

“Because we live in diverse societies, we need to individualize risk assessment and couple that with technology that makes analysis of body composition more accessible,” agreed Dr. Almandoz. He noted that the UT Southwestern weight wellness program where he practices has, for about the past decade, routinely collected waist circumference and bioelectrical impedance data as well as BMI on all people seen in the practice for obesity concerns. Making these additional measurements on a routine basis also helps strengthen patient engagement.

“We get into trouble when we make rigid health policy and clinical decisions based on BMI alone without looking at the patient holistically,” said Dr. Wee. “Patients are more than arbitrary numbers, and clinicians should make clinical decisions based on the totality of evidence for each individual patient.”

Dr. Bessesen, Dr. Wee, Dr. Powell-Wiley, and Dr. Almandoz reported no relevant financial relationships. Dr. Neeland has reported being a consultant for Merck. Dr. Sattar has reported being a consultant or speaker for Abbott Laboratories, Afimmune, Amgen, AstraZeneca, Boehringer Ingelheim, Eli Lilly, Hanmi Pharmaceuticals, Janssen, MSD, Novartis, Novo Nordisk, Pfizer, Roche Diagnostics, and Sanofi.

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

MANCHESTER, ENGLAND – Janus kinase (JAK) inhibitors may be associated with a higher risk for cancer relative to tumor necrosis factor (TNF) inhibitors, according to a meta-analysis reported at the annual meeting of the British Society for Rheumatology.

Looking at all phase 2, 3, and 4 trials and long-term extension studies across the indications of rheumatoid arthritis, psoriatic arthritis, psoriasis, axial spondyloarthritis, inflammatory bowel disease, and atopic dermatitis, the risk ratio for any cancer developing was 1.63 when compared with anti-TNF therapy (95% confidence interval, 1.27-2.09).

Sara Freeman/MDedge News

By comparison, JAK inhibitor use was not significantly associated with any greater risk for cancer than methotrexate (RR, 1.06; 95% confidence interval, 0.58-1.94) or placebo (RR, 1.16; 95% CI, 0.75-1.80).

“Our data suggests that rather than JAK inhibitors necessarily being harmful, it could be more a case of TNF inhibitors being protective,” said Christopher Stovin, MBChB, a specialist registrar in rheumatology at the Princess Royal University Hospital, King’s College Hospital NHS Trust, London.

“We should stress that these are rare events in our study, roughly around 1 in every 100 patient-years of exposure,” Dr. Stovin said.

“Despite having over 80,000 years of patient exposure, the median follow-up duration for JAK inhibitors was still only 118 weeks, which for cancers [that] obviously have long latency periods is still a relatively small duration of time,” the researcher added.

“People worry about the drugs. But there is a possibility that [a] disturbed immune system plays a role per se in development of cancers,” consultant rheumatologist Anurag Bharadwaj, MD, DM, said in an interview.

“Although there are studies which attribute increased risk of cancer to different DMARDs [disease-modifying antirheumatic drugs] and biologics like TNF, but on other hand, it’s maybe that we are giving these drugs to patients who have got more serious immunological disease,” suggested Bharadwaj, who serves as the clinical lead for rheumatology at Basildon (England) Hospital, Mid & South Essex Foundation Trust.

“So, a possibility may be that the more severe or the more active the immunological inflammatory disease, the higher the chance of cancer, and these are the patients who go for the stronger medications,” Dr. Bharadwaj said.

There is an “immunological window of opportunity” when treating these inflammatory diseases, said Dr. Bharadwaj, noting that the first few months of treatment are vital. “For all immunological diseases, the more quickly you bring the immunological abnormality down, the chances of long-term complications go down, including [possibly that the] chances of cancer go down, chances of cardiovascular disease go down, and chances of lung disease go down. Hit it early, hit it hard.”

Concern over a possible higher risk for cancer with JAK inhibitors than with TNF inhibitors was raised following the release of data from the ORAL Surveillance trial, a postmarketing trial of tofacitinib (Xeljanz) that had been mandated by the Food and Drug Administration.

“This was a study looking at the coprimary endpoints of malignancy and major adverse cardiovascular events, and it was enriched with patients over the age of 50, with one additional cardiac risk factor, designed to amplify the detection of these rare events,” Dr. Stovin said.

“There was a signal of an increased risk of malignancy in the tofacitinib group, and this led to the FDA issuing a [boxed warning for all licensed JAK inhibitors] at that time,” he added.

Dr. Stovin and colleagues aimed to determine what, if any, cancer risk was associated with all available JAK inhibitors relative to placebo, TNF inhibitors, and methotrexate.

In all, data from 62 randomized controlled trials and 14 long-term extension studies were included in the meta-analysis, accounting for 82,366 patient years of follow-up. The JAK inhibitors analyzed included tofacitinib, baricitinib (Olumiant), upadacitinib (Rinvoq), filgotinib (Jyseleca), and peficitinib (Smyraf). (Filgotinib and peficitinib have not been approved by the FDA.)

The researchers performed sensitivity analyses that excluded cancers detected within the first 6 months of treatment, the use of higher than licensed JAK inhibitor doses, and patients with non-rheumatoid arthritis diagnoses, but the results remained largely unchanged, Dr. Stovin reported.  

“Perhaps not surprisingly, when we removed ORAL Surveillance” from the analysis comparing JAK inhibitors and TNF inhibitors, “we lost statistical significance,” he said.

“Longitudinal observational data is needed but currently remains limited,” Dr. Stovin concluded.

Dr. Stovin and Dr. Bharadwaj reported no relevant financial relationships. The meta-analysis was independently supported. Dr. Bharadwaj was not involved in the study and provided comment ahead of the presentation.

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

MANCHESTER, ENGLAND – Janus kinase (JAK) inhibitors may be associated with a higher risk for cancer relative to tumor necrosis factor (TNF) inhibitors, according to a meta-analysis reported at the annual meeting of the British Society for Rheumatology.

Looking at all phase 2, 3, and 4 trials and long-term extension studies across the indications of rheumatoid arthritis, psoriatic arthritis, psoriasis, axial spondyloarthritis, inflammatory bowel disease, and atopic dermatitis, the risk ratio for any cancer developing was 1.63 when compared with anti-TNF therapy (95% confidence interval, 1.27-2.09).

Sara Freeman/MDedge News

By comparison, JAK inhibitor use was not significantly associated with any greater risk for cancer than methotrexate (RR, 1.06; 95% confidence interval, 0.58-1.94) or placebo (RR, 1.16; 95% CI, 0.75-1.80).

“Our data suggests that rather than JAK inhibitors necessarily being harmful, it could be more a case of TNF inhibitors being protective,” said Christopher Stovin, MBChB, a specialist registrar in rheumatology at the Princess Royal University Hospital, King’s College Hospital NHS Trust, London.

“We should stress that these are rare events in our study, roughly around 1 in every 100 patient-years of exposure,” Dr. Stovin said.

“Despite having over 80,000 years of patient exposure, the median follow-up duration for JAK inhibitors was still only 118 weeks, which for cancers [that] obviously have long latency periods is still a relatively small duration of time,” the researcher added.

“People worry about the drugs. But there is a possibility that [a] disturbed immune system plays a role per se in development of cancers,” consultant rheumatologist Anurag Bharadwaj, MD, DM, said in an interview.

“Although there are studies which attribute increased risk of cancer to different DMARDs [disease-modifying antirheumatic drugs] and biologics like TNF, but on other hand, it’s maybe that we are giving these drugs to patients who have got more serious immunological disease,” suggested Bharadwaj, who serves as the clinical lead for rheumatology at Basildon (England) Hospital, Mid & South Essex Foundation Trust.

“So, a possibility may be that the more severe or the more active the immunological inflammatory disease, the higher the chance of cancer, and these are the patients who go for the stronger medications,” Dr. Bharadwaj said.

There is an “immunological window of opportunity” when treating these inflammatory diseases, said Dr. Bharadwaj, noting that the first few months of treatment are vital. “For all immunological diseases, the more quickly you bring the immunological abnormality down, the chances of long-term complications go down, including [possibly that the] chances of cancer go down, chances of cardiovascular disease go down, and chances of lung disease go down. Hit it early, hit it hard.”

Concern over a possible higher risk for cancer with JAK inhibitors than with TNF inhibitors was raised following the release of data from the ORAL Surveillance trial, a postmarketing trial of tofacitinib (Xeljanz) that had been mandated by the Food and Drug Administration.

“This was a study looking at the coprimary endpoints of malignancy and major adverse cardiovascular events, and it was enriched with patients over the age of 50, with one additional cardiac risk factor, designed to amplify the detection of these rare events,” Dr. Stovin said.

“There was a signal of an increased risk of malignancy in the tofacitinib group, and this led to the FDA issuing a [boxed warning for all licensed JAK inhibitors] at that time,” he added.

Dr. Stovin and colleagues aimed to determine what, if any, cancer risk was associated with all available JAK inhibitors relative to placebo, TNF inhibitors, and methotrexate.

In all, data from 62 randomized controlled trials and 14 long-term extension studies were included in the meta-analysis, accounting for 82,366 patient years of follow-up. The JAK inhibitors analyzed included tofacitinib, baricitinib (Olumiant), upadacitinib (Rinvoq), filgotinib (Jyseleca), and peficitinib (Smyraf). (Filgotinib and peficitinib have not been approved by the FDA.)

The researchers performed sensitivity analyses that excluded cancers detected within the first 6 months of treatment, the use of higher than licensed JAK inhibitor doses, and patients with non-rheumatoid arthritis diagnoses, but the results remained largely unchanged, Dr. Stovin reported.  

“Perhaps not surprisingly, when we removed ORAL Surveillance” from the analysis comparing JAK inhibitors and TNF inhibitors, “we lost statistical significance,” he said.

“Longitudinal observational data is needed but currently remains limited,” Dr. Stovin concluded.

Dr. Stovin and Dr. Bharadwaj reported no relevant financial relationships. The meta-analysis was independently supported. Dr. Bharadwaj was not involved in the study and provided comment ahead of the presentation.

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

MANCHESTER, ENGLAND – Janus kinase (JAK) inhibitors may be associated with a higher risk for cancer relative to tumor necrosis factor (TNF) inhibitors, according to a meta-analysis reported at the annual meeting of the British Society for Rheumatology.

Looking at all phase 2, 3, and 4 trials and long-term extension studies across the indications of rheumatoid arthritis, psoriatic arthritis, psoriasis, axial spondyloarthritis, inflammatory bowel disease, and atopic dermatitis, the risk ratio for any cancer developing was 1.63 when compared with anti-TNF therapy (95% confidence interval, 1.27-2.09).

Sara Freeman/MDedge News

By comparison, JAK inhibitor use was not significantly associated with any greater risk for cancer than methotrexate (RR, 1.06; 95% confidence interval, 0.58-1.94) or placebo (RR, 1.16; 95% CI, 0.75-1.80).

“Our data suggests that rather than JAK inhibitors necessarily being harmful, it could be more a case of TNF inhibitors being protective,” said Christopher Stovin, MBChB, a specialist registrar in rheumatology at the Princess Royal University Hospital, King’s College Hospital NHS Trust, London.

“We should stress that these are rare events in our study, roughly around 1 in every 100 patient-years of exposure,” Dr. Stovin said.

“Despite having over 80,000 years of patient exposure, the median follow-up duration for JAK inhibitors was still only 118 weeks, which for cancers [that] obviously have long latency periods is still a relatively small duration of time,” the researcher added.

“People worry about the drugs. But there is a possibility that [a] disturbed immune system plays a role per se in development of cancers,” consultant rheumatologist Anurag Bharadwaj, MD, DM, said in an interview.

“Although there are studies which attribute increased risk of cancer to different DMARDs [disease-modifying antirheumatic drugs] and biologics like TNF, but on other hand, it’s maybe that we are giving these drugs to patients who have got more serious immunological disease,” suggested Bharadwaj, who serves as the clinical lead for rheumatology at Basildon (England) Hospital, Mid & South Essex Foundation Trust.

“So, a possibility may be that the more severe or the more active the immunological inflammatory disease, the higher the chance of cancer, and these are the patients who go for the stronger medications,” Dr. Bharadwaj said.

There is an “immunological window of opportunity” when treating these inflammatory diseases, said Dr. Bharadwaj, noting that the first few months of treatment are vital. “For all immunological diseases, the more quickly you bring the immunological abnormality down, the chances of long-term complications go down, including [possibly that the] chances of cancer go down, chances of cardiovascular disease go down, and chances of lung disease go down. Hit it early, hit it hard.”

Concern over a possible higher risk for cancer with JAK inhibitors than with TNF inhibitors was raised following the release of data from the ORAL Surveillance trial, a postmarketing trial of tofacitinib (Xeljanz) that had been mandated by the Food and Drug Administration.

“This was a study looking at the coprimary endpoints of malignancy and major adverse cardiovascular events, and it was enriched with patients over the age of 50, with one additional cardiac risk factor, designed to amplify the detection of these rare events,” Dr. Stovin said.

“There was a signal of an increased risk of malignancy in the tofacitinib group, and this led to the FDA issuing a [boxed warning for all licensed JAK inhibitors] at that time,” he added.

Dr. Stovin and colleagues aimed to determine what, if any, cancer risk was associated with all available JAK inhibitors relative to placebo, TNF inhibitors, and methotrexate.

In all, data from 62 randomized controlled trials and 14 long-term extension studies were included in the meta-analysis, accounting for 82,366 patient years of follow-up. The JAK inhibitors analyzed included tofacitinib, baricitinib (Olumiant), upadacitinib (Rinvoq), filgotinib (Jyseleca), and peficitinib (Smyraf). (Filgotinib and peficitinib have not been approved by the FDA.)

The researchers performed sensitivity analyses that excluded cancers detected within the first 6 months of treatment, the use of higher than licensed JAK inhibitor doses, and patients with non-rheumatoid arthritis diagnoses, but the results remained largely unchanged, Dr. Stovin reported.  

“Perhaps not surprisingly, when we removed ORAL Surveillance” from the analysis comparing JAK inhibitors and TNF inhibitors, “we lost statistical significance,” he said.

“Longitudinal observational data is needed but currently remains limited,” Dr. Stovin concluded.

Dr. Stovin and Dr. Bharadwaj reported no relevant financial relationships. The meta-analysis was independently supported. Dr. Bharadwaj was not involved in the study and provided comment ahead of the presentation.

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

Scent-detecting dogs have long been used to sniff out medical conditions ranging from low blood sugar and cancer to malaria, impending seizures, and migraines – not to mention explosives and narcotics.

Recently, the sensitivity of the canine nose has been tested as a strategy for screening for SARS-CoV-2 infection in schoolchildren showing no outward symptoms of the virus. A pilot study led by Carol A. Glaser, DVM, MD, of the California Department of Public Health in Richmond, found that trained dogs had an accuracy of more than 95% for detecting the odor of volatile organic compounds, or VOCs, produced by COVID-infected individuals.

California Department of Public Health

The authors believe that odor-based diagnosis with dogs could eventually provide a rapid, inexpensive, and noninvasive way to screen large groups for COVID-19 without the need for antigen testing.

“This is a new program with research ongoing, so it would be premature to consider it from a consumer’s perspective,” Dr. Glaser said in an interview. “However, the data look promising and we are hopeful we can continue to pilot various programs in various settings to see where, and if, dogs can be used for biomedical detection.”
 

In the lab and in the field

In a study published online in JAMA Pediatrics, Dr. Glaser’s group found that after 2 months’ training on COVID-19 scent samples in the laboratory, the dogs detected the presence of the virus more than 95% of the time. Antigen tests were used as a comparative reference.

In medical terms, the dogs achieved a greater than 95% accuracy on two important measures of effectiveness: sensitivity – a test’s ability to correctly detect the positive presence of disease – and specificity – the ability of a test to accurately rule out the presence of disease and identify as negative an uninfected person.

Next, the researchers piloted field tests in 50 visits at 27 schools from April 1 to May 25, 2022, to compare dogs’ detection ability with that of standard laboratory antigen testing. Participants in the completely voluntary screening numbered 1,558 and ranged in age from 9 to 17 years. Of these, 56% were girls and 89% were students. Almost 70% were screened at least twice.

Overall, the field test compared 3,897 paired antigen-vs.-dog screenings. The dogs accurately signaled the presence of 85 infections and ruled out 3,411 infections, for an overall accuracy of 90%. In 383 cases, however, they inaccurately signaled the presence of infection (false positives) and missed 18 actual infections (false negatives). That translated to a sensitivity in the field of 83%, considerably lower than that of their lab performance.

Direct screening of individuals with dogs outside of the lab involved circumstantial factors that likely contributed to decreased sensitivity and specificity, the authors acknowledged. These included such distractions as noise and the presence of excitable young children as well environmental conditions such as wind and other odors. What about dog phobia and dog hair allergy? “Dog screening takes only a few seconds per student and the dogs do not generally touch the participant as they run a line and sniff at ankles,” Dr. Glaser explained.

As for allergies, the rapid, ankle-level screening occurred in outdoor settings. “The chance of allergies is very low. This would be similar to someone who is out walking on the sidewalk and walks by a dog,” Dr. Glaser said.

Last year, a British trial of almost 4,000 adults tested six dogs trained to detect differences in VOCs between COVID-infected and uninfected individuals. Given samples from both groups, the dogs were able to distinguish between infected and uninfected samples with a sensitivity for detecting the virus ranging from 82% to 94% and a specificity for ruling it out of 76% to 92%. And they were able to smell the VOCs even when the viral load was low. The study also tested organic sensors, which proved even more accurate than the canines.

According to lead author James G. Logan, PhD, a disease control expert at the London School of Hygiene & Tropical Medicine in London, “Odour-based diagnostics using dogs and/or sensors may prove a rapid and effective tool for screening large numbers of people. Mathematical modelling suggests that dog screening plus a confirmatory PCR test could detect up to 89% of SARS-CoV-2 infections, averting up to 2.2 times as much transmission compared to isolation of symptomatic individuals only.”

Funding was provided by the Centers for Disease Control and Prevention Foundation (CDCF) to Early Alert Canines for the purchase and care of the dogs and the support of the handlers and trainers. The CDCF had no other role in the study. Coauthor Carol A. Edwards of Early Alert Canines reported receiving grants from the CDCF.

Scent-detecting dogs have long been used to sniff out medical conditions ranging from low blood sugar and cancer to malaria, impending seizures, and migraines – not to mention explosives and narcotics.

Recently, the sensitivity of the canine nose has been tested as a strategy for screening for SARS-CoV-2 infection in schoolchildren showing no outward symptoms of the virus. A pilot study led by Carol A. Glaser, DVM, MD, of the California Department of Public Health in Richmond, found that trained dogs had an accuracy of more than 95% for detecting the odor of volatile organic compounds, or VOCs, produced by COVID-infected individuals.

California Department of Public Health

The authors believe that odor-based diagnosis with dogs could eventually provide a rapid, inexpensive, and noninvasive way to screen large groups for COVID-19 without the need for antigen testing.

“This is a new program with research ongoing, so it would be premature to consider it from a consumer’s perspective,” Dr. Glaser said in an interview. “However, the data look promising and we are hopeful we can continue to pilot various programs in various settings to see where, and if, dogs can be used for biomedical detection.”
 

In the lab and in the field

In a study published online in JAMA Pediatrics, Dr. Glaser’s group found that after 2 months’ training on COVID-19 scent samples in the laboratory, the dogs detected the presence of the virus more than 95% of the time. Antigen tests were used as a comparative reference.

In medical terms, the dogs achieved a greater than 95% accuracy on two important measures of effectiveness: sensitivity – a test’s ability to correctly detect the positive presence of disease – and specificity – the ability of a test to accurately rule out the presence of disease and identify as negative an uninfected person.

Next, the researchers piloted field tests in 50 visits at 27 schools from April 1 to May 25, 2022, to compare dogs’ detection ability with that of standard laboratory antigen testing. Participants in the completely voluntary screening numbered 1,558 and ranged in age from 9 to 17 years. Of these, 56% were girls and 89% were students. Almost 70% were screened at least twice.

Overall, the field test compared 3,897 paired antigen-vs.-dog screenings. The dogs accurately signaled the presence of 85 infections and ruled out 3,411 infections, for an overall accuracy of 90%. In 383 cases, however, they inaccurately signaled the presence of infection (false positives) and missed 18 actual infections (false negatives). That translated to a sensitivity in the field of 83%, considerably lower than that of their lab performance.

Direct screening of individuals with dogs outside of the lab involved circumstantial factors that likely contributed to decreased sensitivity and specificity, the authors acknowledged. These included such distractions as noise and the presence of excitable young children as well environmental conditions such as wind and other odors. What about dog phobia and dog hair allergy? “Dog screening takes only a few seconds per student and the dogs do not generally touch the participant as they run a line and sniff at ankles,” Dr. Glaser explained.

As for allergies, the rapid, ankle-level screening occurred in outdoor settings. “The chance of allergies is very low. This would be similar to someone who is out walking on the sidewalk and walks by a dog,” Dr. Glaser said.

Last year, a British trial of almost 4,000 adults tested six dogs trained to detect differences in VOCs between COVID-infected and uninfected individuals. Given samples from both groups, the dogs were able to distinguish between infected and uninfected samples with a sensitivity for detecting the virus ranging from 82% to 94% and a specificity for ruling it out of 76% to 92%. And they were able to smell the VOCs even when the viral load was low. The study also tested organic sensors, which proved even more accurate than the canines.

According to lead author James G. Logan, PhD, a disease control expert at the London School of Hygiene & Tropical Medicine in London, “Odour-based diagnostics using dogs and/or sensors may prove a rapid and effective tool for screening large numbers of people. Mathematical modelling suggests that dog screening plus a confirmatory PCR test could detect up to 89% of SARS-CoV-2 infections, averting up to 2.2 times as much transmission compared to isolation of symptomatic individuals only.”

Funding was provided by the Centers for Disease Control and Prevention Foundation (CDCF) to Early Alert Canines for the purchase and care of the dogs and the support of the handlers and trainers. The CDCF had no other role in the study. Coauthor Carol A. Edwards of Early Alert Canines reported receiving grants from the CDCF.

Scent-detecting dogs have long been used to sniff out medical conditions ranging from low blood sugar and cancer to malaria, impending seizures, and migraines – not to mention explosives and narcotics.

Recently, the sensitivity of the canine nose has been tested as a strategy for screening for SARS-CoV-2 infection in schoolchildren showing no outward symptoms of the virus. A pilot study led by Carol A. Glaser, DVM, MD, of the California Department of Public Health in Richmond, found that trained dogs had an accuracy of more than 95% for detecting the odor of volatile organic compounds, or VOCs, produced by COVID-infected individuals.

California Department of Public Health

The authors believe that odor-based diagnosis with dogs could eventually provide a rapid, inexpensive, and noninvasive way to screen large groups for COVID-19 without the need for antigen testing.

“This is a new program with research ongoing, so it would be premature to consider it from a consumer’s perspective,” Dr. Glaser said in an interview. “However, the data look promising and we are hopeful we can continue to pilot various programs in various settings to see where, and if, dogs can be used for biomedical detection.”
 

In the lab and in the field

In a study published online in JAMA Pediatrics, Dr. Glaser’s group found that after 2 months’ training on COVID-19 scent samples in the laboratory, the dogs detected the presence of the virus more than 95% of the time. Antigen tests were used as a comparative reference.

In medical terms, the dogs achieved a greater than 95% accuracy on two important measures of effectiveness: sensitivity – a test’s ability to correctly detect the positive presence of disease – and specificity – the ability of a test to accurately rule out the presence of disease and identify as negative an uninfected person.

Next, the researchers piloted field tests in 50 visits at 27 schools from April 1 to May 25, 2022, to compare dogs’ detection ability with that of standard laboratory antigen testing. Participants in the completely voluntary screening numbered 1,558 and ranged in age from 9 to 17 years. Of these, 56% were girls and 89% were students. Almost 70% were screened at least twice.

Overall, the field test compared 3,897 paired antigen-vs.-dog screenings. The dogs accurately signaled the presence of 85 infections and ruled out 3,411 infections, for an overall accuracy of 90%. In 383 cases, however, they inaccurately signaled the presence of infection (false positives) and missed 18 actual infections (false negatives). That translated to a sensitivity in the field of 83%, considerably lower than that of their lab performance.

Direct screening of individuals with dogs outside of the lab involved circumstantial factors that likely contributed to decreased sensitivity and specificity, the authors acknowledged. These included such distractions as noise and the presence of excitable young children as well environmental conditions such as wind and other odors. What about dog phobia and dog hair allergy? “Dog screening takes only a few seconds per student and the dogs do not generally touch the participant as they run a line and sniff at ankles,” Dr. Glaser explained.

As for allergies, the rapid, ankle-level screening occurred in outdoor settings. “The chance of allergies is very low. This would be similar to someone who is out walking on the sidewalk and walks by a dog,” Dr. Glaser said.

Last year, a British trial of almost 4,000 adults tested six dogs trained to detect differences in VOCs between COVID-infected and uninfected individuals. Given samples from both groups, the dogs were able to distinguish between infected and uninfected samples with a sensitivity for detecting the virus ranging from 82% to 94% and a specificity for ruling it out of 76% to 92%. And they were able to smell the VOCs even when the viral load was low. The study also tested organic sensors, which proved even more accurate than the canines.

According to lead author James G. Logan, PhD, a disease control expert at the London School of Hygiene & Tropical Medicine in London, “Odour-based diagnostics using dogs and/or sensors may prove a rapid and effective tool for screening large numbers of people. Mathematical modelling suggests that dog screening plus a confirmatory PCR test could detect up to 89% of SARS-CoV-2 infections, averting up to 2.2 times as much transmission compared to isolation of symptomatic individuals only.”

Funding was provided by the Centers for Disease Control and Prevention Foundation (CDCF) to Early Alert Canines for the purchase and care of the dogs and the support of the handlers and trainers. The CDCF had no other role in the study. Coauthor Carol A. Edwards of Early Alert Canines reported receiving grants from the CDCF.

Cardiovascular disease (CVD) is the main cause of premature death and disability in the general population, and according to the World Health Organization, the incidence of CVD is increasing throughout the world. Conventional risk factors that contribute to the occurrence and worsening of CVD have been identified and widely studied. They include high cholesterol levels, high blood pressure, diabetes, obesity, smoking, and lack of physical activity. Despite the introduction of measures to prevent and treat these risk factors with lipid-lowering drugs, antihypertensives, antiplatelet drugs, and anticoagulants, the mortality rate related to CVD remains high.
 

Despite the effectiveness of many currently available treatment options, there are still significant gaps in risk assessment and treatment of CVD.

In the past few years, new coronary risk factors have emerged. They are detailed in an editorial published in The American Journal of Medicine that describes their role and their impact on our cardiovascular health.
 

Systemic inflammation

The new coronary risk factors include the following diseases characterized by systemic inflammation:

• Gout – Among patients who have experienced a recent flare of gout, the probability of experiencing an acute cardiovascular event such as a myocardial infarction or stroke is increased.
• Rheumatoid arthritis and systemic lupus erythematous – Patients with one or both of these conditions are at higher odds of experiencing concomitant premature and extremely premature coronary artery disease.
• Inflammatory bowel disease (Crohn’s disease or ulcerative colitis) – Patients with this disease have increased odds of developing coronary artery disease.
• Psoriasis – Patients with psoriasis are up to 50% more likely to develop CVD.

Maternal and childhood factors

The following maternal and childhood factors are associated with an increased risk of developing coronary artery disease: gestational diabetes; preeclampsia; delivering a child of low birth weight; preterm delivery; and premature or surgical menopause. The factor or factors that increase the risk of coronary artery disease associated with each of these conditions are not known but may be the result of increased cytokine and oxidative stress.

An unusual and yet unexplained association has been observed between migraine headaches with aura in women and incident CVD.

Also of interest is the association of early life trauma and the risk of adverse cardiovascular outcomes in young and middle-aged individuals who have a history of myocardial infarction.

Transgender patients who present for gender-affirming care are also at increased cardiovascular risk. Among these patients, the increase in coronary artery disease risk may be related to high rates of anxiety and depression.
 

Environmental factors

Low socioeconomic status has emerged as a risk factor. Increased psychosocial stressors, limited educational and economic opportunities, and lack of peer influence favoring healthier lifestyle choices may be causative elements leading to enhanced coronary artery disease among individuals with low socioeconomic living conditions.

Air pollution was estimated to have caused 9 million deaths worldwide in 2019, with 62% due to CVD and 31.7% to coronary artery disease. Severely polluted environmental aerosols contain several toxic metals, such as lead, mercury, arsenic, and cadmium. Transient exposure to various air pollutants may trigger the onset of an acute coronary syndrome.
 

Lifestyle factors

Long working hours by patients who have experienced a first myocardial infarction increase the risk for a recurrent event, possibly because of prolonged exposure to work stressors.

Skipping breakfast has been linked to increased cardiovascular and all-cause mortality.

Long-term consumption of drinks containing sugar and artificial sweeteners has also been associated with increased cardiovascular mortality.

Recognizing the presence of one or more of these new risk factors could help prompt and improve behaviors for reducing more conventional CV risk factors to a minimum.

This article was translated from Univadis Italy, which is part of the Medscape Professional Network.

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

Cardiovascular disease (CVD) is the main cause of premature death and disability in the general population, and according to the World Health Organization, the incidence of CVD is increasing throughout the world. Conventional risk factors that contribute to the occurrence and worsening of CVD have been identified and widely studied. They include high cholesterol levels, high blood pressure, diabetes, obesity, smoking, and lack of physical activity. Despite the introduction of measures to prevent and treat these risk factors with lipid-lowering drugs, antihypertensives, antiplatelet drugs, and anticoagulants, the mortality rate related to CVD remains high.
 

Despite the effectiveness of many currently available treatment options, there are still significant gaps in risk assessment and treatment of CVD.

In the past few years, new coronary risk factors have emerged. They are detailed in an editorial published in The American Journal of Medicine that describes their role and their impact on our cardiovascular health.
 

Systemic inflammation

The new coronary risk factors include the following diseases characterized by systemic inflammation:

• Gout – Among patients who have experienced a recent flare of gout, the probability of experiencing an acute cardiovascular event such as a myocardial infarction or stroke is increased.
• Rheumatoid arthritis and systemic lupus erythematous – Patients with one or both of these conditions are at higher odds of experiencing concomitant premature and extremely premature coronary artery disease.
• Inflammatory bowel disease (Crohn’s disease or ulcerative colitis) – Patients with this disease have increased odds of developing coronary artery disease.
• Psoriasis – Patients with psoriasis are up to 50% more likely to develop CVD.

Maternal and childhood factors

The following maternal and childhood factors are associated with an increased risk of developing coronary artery disease: gestational diabetes; preeclampsia; delivering a child of low birth weight; preterm delivery; and premature or surgical menopause. The factor or factors that increase the risk of coronary artery disease associated with each of these conditions are not known but may be the result of increased cytokine and oxidative stress.

An unusual and yet unexplained association has been observed between migraine headaches with aura in women and incident CVD.

Also of interest is the association of early life trauma and the risk of adverse cardiovascular outcomes in young and middle-aged individuals who have a history of myocardial infarction.

Transgender patients who present for gender-affirming care are also at increased cardiovascular risk. Among these patients, the increase in coronary artery disease risk may be related to high rates of anxiety and depression.
 

Environmental factors

Low socioeconomic status has emerged as a risk factor. Increased psychosocial stressors, limited educational and economic opportunities, and lack of peer influence favoring healthier lifestyle choices may be causative elements leading to enhanced coronary artery disease among individuals with low socioeconomic living conditions.

Air pollution was estimated to have caused 9 million deaths worldwide in 2019, with 62% due to CVD and 31.7% to coronary artery disease. Severely polluted environmental aerosols contain several toxic metals, such as lead, mercury, arsenic, and cadmium. Transient exposure to various air pollutants may trigger the onset of an acute coronary syndrome.
 

Lifestyle factors

Long working hours by patients who have experienced a first myocardial infarction increase the risk for a recurrent event, possibly because of prolonged exposure to work stressors.

Skipping breakfast has been linked to increased cardiovascular and all-cause mortality.

Long-term consumption of drinks containing sugar and artificial sweeteners has also been associated with increased cardiovascular mortality.

Recognizing the presence of one or more of these new risk factors could help prompt and improve behaviors for reducing more conventional CV risk factors to a minimum.

This article was translated from Univadis Italy, which is part of the Medscape Professional Network.

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

Cardiovascular disease (CVD) is the main cause of premature death and disability in the general population, and according to the World Health Organization, the incidence of CVD is increasing throughout the world. Conventional risk factors that contribute to the occurrence and worsening of CVD have been identified and widely studied. They include high cholesterol levels, high blood pressure, diabetes, obesity, smoking, and lack of physical activity. Despite the introduction of measures to prevent and treat these risk factors with lipid-lowering drugs, antihypertensives, antiplatelet drugs, and anticoagulants, the mortality rate related to CVD remains high.
 

Despite the effectiveness of many currently available treatment options, there are still significant gaps in risk assessment and treatment of CVD.

In the past few years, new coronary risk factors have emerged. They are detailed in an editorial published in The American Journal of Medicine that describes their role and their impact on our cardiovascular health.
 

Systemic inflammation

The new coronary risk factors include the following diseases characterized by systemic inflammation:

• Gout – Among patients who have experienced a recent flare of gout, the probability of experiencing an acute cardiovascular event such as a myocardial infarction or stroke is increased.
• Rheumatoid arthritis and systemic lupus erythematous – Patients with one or both of these conditions are at higher odds of experiencing concomitant premature and extremely premature coronary artery disease.
• Inflammatory bowel disease (Crohn’s disease or ulcerative colitis) – Patients with this disease have increased odds of developing coronary artery disease.
• Psoriasis – Patients with psoriasis are up to 50% more likely to develop CVD.

Maternal and childhood factors

The following maternal and childhood factors are associated with an increased risk of developing coronary artery disease: gestational diabetes; preeclampsia; delivering a child of low birth weight; preterm delivery; and premature or surgical menopause. The factor or factors that increase the risk of coronary artery disease associated with each of these conditions are not known but may be the result of increased cytokine and oxidative stress.

An unusual and yet unexplained association has been observed between migraine headaches with aura in women and incident CVD.

Also of interest is the association of early life trauma and the risk of adverse cardiovascular outcomes in young and middle-aged individuals who have a history of myocardial infarction.

Transgender patients who present for gender-affirming care are also at increased cardiovascular risk. Among these patients, the increase in coronary artery disease risk may be related to high rates of anxiety and depression.
 

Environmental factors

Low socioeconomic status has emerged as a risk factor. Increased psychosocial stressors, limited educational and economic opportunities, and lack of peer influence favoring healthier lifestyle choices may be causative elements leading to enhanced coronary artery disease among individuals with low socioeconomic living conditions.

Air pollution was estimated to have caused 9 million deaths worldwide in 2019, with 62% due to CVD and 31.7% to coronary artery disease. Severely polluted environmental aerosols contain several toxic metals, such as lead, mercury, arsenic, and cadmium. Transient exposure to various air pollutants may trigger the onset of an acute coronary syndrome.
 

Lifestyle factors

Long working hours by patients who have experienced a first myocardial infarction increase the risk for a recurrent event, possibly because of prolonged exposure to work stressors.

Skipping breakfast has been linked to increased cardiovascular and all-cause mortality.

Long-term consumption of drinks containing sugar and artificial sweeteners has also been associated with increased cardiovascular mortality.

Recognizing the presence of one or more of these new risk factors could help prompt and improve behaviors for reducing more conventional CV risk factors to a minimum.

This article was translated from Univadis Italy, which is part of the Medscape Professional Network.

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

Seasonal variation in one of the hormones used to monitor thyroid function could in turn lead to false diagnoses of subclinical hypothyroidism and unnecessary prescriptions of levothyroxine, according to Yale clinical chemist Joe M. El-Khoury, PhD.

A Japanese study of more than 7,000 healthy individuals showed that thyrotropin-stimulating hormone (TSH) varies widely throughout the seasons, he said, peaking in the northern hemisphere’s winter months (January to February) with its low in the summer months (June to August). That paper was published last year in the Journal of the Endocrine Society.

Sebastian Kaulitzki/Fotolia

But free thyroxine (FT4) levels in the Japanese population remained relatively stable, he wrote in a letter recently published in Clinical Chemistry.

“If you end up with a mildly elevated TSH result and a normal FT4, try getting retested 2-3 months later to make sure this is not a seasonal artifact or transient increase before prescribing/taking levothyroxine unnecessarily,” advised Dr. El-Khoury, director of Yale University’s Clinical Chemistry Laboratory, New Haven, Conn.

“Because the [population-based, laboratory] reference ranges don’t account for seasonal variation, we’re flagging a significant number of people as high TSH when they’re normal, and physicians are prescribing levothyroxine inappropriately to healthy people who don’t need it,” he told this news organization, adding that overtreatment can be harmful, particularly for elderly people.

This seasonal variation in TSH could account for between a third to a half of the 90% of all levothyroxine prescriptions that were found to be unnecessary, according to a U.S. study in 2021, Dr. El-Khoury added.

In a comment, Trisha Cubb, MD, said that Dr. El-Khoury’s letter “raises a good point, that we really need to look at our reference ranges, especially when more and more studies are showing that so many thyroid hormone prescriptions may not be necessary.”

Dr. Cubb, thyroid section director and assistant professor of clinical medicine at Weill Cornell Medical College/Houston Methodist Academic Institute, Texas, also agrees with Dr. El-Khoury’s suggestion to repeat lab results in some instances.

“I think repeating results, especially in our patients with subclinical disease, is important,” she noted.

And she pointed out that seasonal variation isn’t the only relevant variable. “We also know that multiple clinical factors like pregnancy status, coexisting comorbidities, or age can all influence what we as clinicians consider an acceptable TSH range in an individual patient.” And other medications, such as steroids, or supplements like biotin, “can all affect thyroid lab values,” she noted.

“Ensuring that minor abnormalities aren’t transient is important prior to initiating medical therapy. With any medical therapy there are possible side effects, along with time, cost, [and] monitoring, all of which can be associated with thyroid hormone replacement.”
 

TSH reference ranges should be adapted for subpopulations

Dr. El-Khoury explained that to get an idea of how big the seasonal differences in TSH observed in the Japanese study were, “the upper end of the population they tracked goes from 5.2 [mIU/L] in January to 3.4 [mIU/L] in August. So you have almost a 2-unit change in concentration that can happen in the reference population. But laboratory reference ranges, or ‘normal ranges,’ are usually fixed and don’t change by season.”

The higher the TSH, the more likely a person is to have hypothyroidism. Major recent studies have found no benefit of levothyroxine treatment with TSH levels below 7.0-10.0 mIU/L, he said.

“So, I suggest that the limit should be 7.0 [mIU/L] to be safe, but it could be as high as 10 [mIU/L]. In any case, let’s shift the mindset to clinical outcome–based treatment cutoffs,” he said, noting that this approach is currently used for decisions on cholesterol-lowering therapy or vitamin D supplementation, for example.

Regarding this suggestion of using a TSH cutoff of 7 mIU/L to diagnose subclinical hypothyroidism, Dr. Cubb said: “It really depends on the specific population. In an elderly patient, a higher TSH may be of less clinical concern when compared to a female who is actively trying to get pregnant.

“Overall, I think we do need to better understand what appropriate TSH ranges are in specific subpopulations, and then with time, make this more understandable and available for general medicine as well as subspecialty providers to be able to utilize,” she noted.

Regarding the particular Japanese findings cited by Dr. El-Khoury, Dr. Cubb observed that this was a very specific study population, “so we would need more data showing that this is more generalizable.”

And she noted that there’s also diurnal variation in TSH. “In the [Japanese] paper, patients had their thyroid labs drawn between 8:00 a.m. and 9:00 a.m. in a fasting state. Oftentimes in the U.S., thyroid labs are not drawn at specific times or [during] fasting. I think this is one of many factors that should be considered.”
 

Acknowledging seasonal variation would be a start

But overall, Dr. Cubb said that both the Japanese study and Dr. El-Khoury’s letter highlight “how season, in and of itself, which is not something we usually think about, can affect thyroid lab results. I believe as more data come out, more generalizable data, that’s how evidence-based guidelines are generated over time.”

According to Dr. El-Khoury, fixing the laboratory reference range issues would likely require a joint effort of professional medical societies, reference laboratories, and assay manufacturers. But with seasonal variation, that might be a difficult task.

“The problem is, in laboratory medicine, we don’t have rules for an analyte that changes by season to do anything different. My goal is to get people to at least acknowledge this is a problem and do something,” he concluded.

Dr. El-Khoury and Dr. Cubb have reported no relevant financial relationships.
 

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

Seasonal variation in one of the hormones used to monitor thyroid function could in turn lead to false diagnoses of subclinical hypothyroidism and unnecessary prescriptions of levothyroxine, according to Yale clinical chemist Joe M. El-Khoury, PhD.

A Japanese study of more than 7,000 healthy individuals showed that thyrotropin-stimulating hormone (TSH) varies widely throughout the seasons, he said, peaking in the northern hemisphere’s winter months (January to February) with its low in the summer months (June to August). That paper was published last year in the Journal of the Endocrine Society.

Sebastian Kaulitzki/Fotolia

But free thyroxine (FT4) levels in the Japanese population remained relatively stable, he wrote in a letter recently published in Clinical Chemistry.

“If you end up with a mildly elevated TSH result and a normal FT4, try getting retested 2-3 months later to make sure this is not a seasonal artifact or transient increase before prescribing/taking levothyroxine unnecessarily,” advised Dr. El-Khoury, director of Yale University’s Clinical Chemistry Laboratory, New Haven, Conn.

“Because the [population-based, laboratory] reference ranges don’t account for seasonal variation, we’re flagging a significant number of people as high TSH when they’re normal, and physicians are prescribing levothyroxine inappropriately to healthy people who don’t need it,” he told this news organization, adding that overtreatment can be harmful, particularly for elderly people.

This seasonal variation in TSH could account for between a third to a half of the 90% of all levothyroxine prescriptions that were found to be unnecessary, according to a U.S. study in 2021, Dr. El-Khoury added.

In a comment, Trisha Cubb, MD, said that Dr. El-Khoury’s letter “raises a good point, that we really need to look at our reference ranges, especially when more and more studies are showing that so many thyroid hormone prescriptions may not be necessary.”

Dr. Cubb, thyroid section director and assistant professor of clinical medicine at Weill Cornell Medical College/Houston Methodist Academic Institute, Texas, also agrees with Dr. El-Khoury’s suggestion to repeat lab results in some instances.

“I think repeating results, especially in our patients with subclinical disease, is important,” she noted.

And she pointed out that seasonal variation isn’t the only relevant variable. “We also know that multiple clinical factors like pregnancy status, coexisting comorbidities, or age can all influence what we as clinicians consider an acceptable TSH range in an individual patient.” And other medications, such as steroids, or supplements like biotin, “can all affect thyroid lab values,” she noted.

“Ensuring that minor abnormalities aren’t transient is important prior to initiating medical therapy. With any medical therapy there are possible side effects, along with time, cost, [and] monitoring, all of which can be associated with thyroid hormone replacement.”
 

TSH reference ranges should be adapted for subpopulations

Dr. El-Khoury explained that to get an idea of how big the seasonal differences in TSH observed in the Japanese study were, “the upper end of the population they tracked goes from 5.2 [mIU/L] in January to 3.4 [mIU/L] in August. So you have almost a 2-unit change in concentration that can happen in the reference population. But laboratory reference ranges, or ‘normal ranges,’ are usually fixed and don’t change by season.”

The higher the TSH, the more likely a person is to have hypothyroidism. Major recent studies have found no benefit of levothyroxine treatment with TSH levels below 7.0-10.0 mIU/L, he said.

“So, I suggest that the limit should be 7.0 [mIU/L] to be safe, but it could be as high as 10 [mIU/L]. In any case, let’s shift the mindset to clinical outcome–based treatment cutoffs,” he said, noting that this approach is currently used for decisions on cholesterol-lowering therapy or vitamin D supplementation, for example.

Regarding this suggestion of using a TSH cutoff of 7 mIU/L to diagnose subclinical hypothyroidism, Dr. Cubb said: “It really depends on the specific population. In an elderly patient, a higher TSH may be of less clinical concern when compared to a female who is actively trying to get pregnant.

“Overall, I think we do need to better understand what appropriate TSH ranges are in specific subpopulations, and then with time, make this more understandable and available for general medicine as well as subspecialty providers to be able to utilize,” she noted.

Regarding the particular Japanese findings cited by Dr. El-Khoury, Dr. Cubb observed that this was a very specific study population, “so we would need more data showing that this is more generalizable.”

And she noted that there’s also diurnal variation in TSH. “In the [Japanese] paper, patients had their thyroid labs drawn between 8:00 a.m. and 9:00 a.m. in a fasting state. Oftentimes in the U.S., thyroid labs are not drawn at specific times or [during] fasting. I think this is one of many factors that should be considered.”
 

Acknowledging seasonal variation would be a start

But overall, Dr. Cubb said that both the Japanese study and Dr. El-Khoury’s letter highlight “how season, in and of itself, which is not something we usually think about, can affect thyroid lab results. I believe as more data come out, more generalizable data, that’s how evidence-based guidelines are generated over time.”

According to Dr. El-Khoury, fixing the laboratory reference range issues would likely require a joint effort of professional medical societies, reference laboratories, and assay manufacturers. But with seasonal variation, that might be a difficult task.

“The problem is, in laboratory medicine, we don’t have rules for an analyte that changes by season to do anything different. My goal is to get people to at least acknowledge this is a problem and do something,” he concluded.

Dr. El-Khoury and Dr. Cubb have reported no relevant financial relationships.
 

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

Seasonal variation in one of the hormones used to monitor thyroid function could in turn lead to false diagnoses of subclinical hypothyroidism and unnecessary prescriptions of levothyroxine, according to Yale clinical chemist Joe M. El-Khoury, PhD.

A Japanese study of more than 7,000 healthy individuals showed that thyrotropin-stimulating hormone (TSH) varies widely throughout the seasons, he said, peaking in the northern hemisphere’s winter months (January to February) with its low in the summer months (June to August). That paper was published last year in the Journal of the Endocrine Society.

Sebastian Kaulitzki/Fotolia

But free thyroxine (FT4) levels in the Japanese population remained relatively stable, he wrote in a letter recently published in Clinical Chemistry.

“If you end up with a mildly elevated TSH result and a normal FT4, try getting retested 2-3 months later to make sure this is not a seasonal artifact or transient increase before prescribing/taking levothyroxine unnecessarily,” advised Dr. El-Khoury, director of Yale University’s Clinical Chemistry Laboratory, New Haven, Conn.

“Because the [population-based, laboratory] reference ranges don’t account for seasonal variation, we’re flagging a significant number of people as high TSH when they’re normal, and physicians are prescribing levothyroxine inappropriately to healthy people who don’t need it,” he told this news organization, adding that overtreatment can be harmful, particularly for elderly people.

This seasonal variation in TSH could account for between a third to a half of the 90% of all levothyroxine prescriptions that were found to be unnecessary, according to a U.S. study in 2021, Dr. El-Khoury added.

In a comment, Trisha Cubb, MD, said that Dr. El-Khoury’s letter “raises a good point, that we really need to look at our reference ranges, especially when more and more studies are showing that so many thyroid hormone prescriptions may not be necessary.”

Dr. Cubb, thyroid section director and assistant professor of clinical medicine at Weill Cornell Medical College/Houston Methodist Academic Institute, Texas, also agrees with Dr. El-Khoury’s suggestion to repeat lab results in some instances.

“I think repeating results, especially in our patients with subclinical disease, is important,” she noted.

And she pointed out that seasonal variation isn’t the only relevant variable. “We also know that multiple clinical factors like pregnancy status, coexisting comorbidities, or age can all influence what we as clinicians consider an acceptable TSH range in an individual patient.” And other medications, such as steroids, or supplements like biotin, “can all affect thyroid lab values,” she noted.

“Ensuring that minor abnormalities aren’t transient is important prior to initiating medical therapy. With any medical therapy there are possible side effects, along with time, cost, [and] monitoring, all of which can be associated with thyroid hormone replacement.”
 

TSH reference ranges should be adapted for subpopulations

Dr. El-Khoury explained that to get an idea of how big the seasonal differences in TSH observed in the Japanese study were, “the upper end of the population they tracked goes from 5.2 [mIU/L] in January to 3.4 [mIU/L] in August. So you have almost a 2-unit change in concentration that can happen in the reference population. But laboratory reference ranges, or ‘normal ranges,’ are usually fixed and don’t change by season.”

The higher the TSH, the more likely a person is to have hypothyroidism. Major recent studies have found no benefit of levothyroxine treatment with TSH levels below 7.0-10.0 mIU/L, he said.

“So, I suggest that the limit should be 7.0 [mIU/L] to be safe, but it could be as high as 10 [mIU/L]. In any case, let’s shift the mindset to clinical outcome–based treatment cutoffs,” he said, noting that this approach is currently used for decisions on cholesterol-lowering therapy or vitamin D supplementation, for example.

Regarding this suggestion of using a TSH cutoff of 7 mIU/L to diagnose subclinical hypothyroidism, Dr. Cubb said: “It really depends on the specific population. In an elderly patient, a higher TSH may be of less clinical concern when compared to a female who is actively trying to get pregnant.

“Overall, I think we do need to better understand what appropriate TSH ranges are in specific subpopulations, and then with time, make this more understandable and available for general medicine as well as subspecialty providers to be able to utilize,” she noted.

Regarding the particular Japanese findings cited by Dr. El-Khoury, Dr. Cubb observed that this was a very specific study population, “so we would need more data showing that this is more generalizable.”

And she noted that there’s also diurnal variation in TSH. “In the [Japanese] paper, patients had their thyroid labs drawn between 8:00 a.m. and 9:00 a.m. in a fasting state. Oftentimes in the U.S., thyroid labs are not drawn at specific times or [during] fasting. I think this is one of many factors that should be considered.”
 

Acknowledging seasonal variation would be a start

But overall, Dr. Cubb said that both the Japanese study and Dr. El-Khoury’s letter highlight “how season, in and of itself, which is not something we usually think about, can affect thyroid lab results. I believe as more data come out, more generalizable data, that’s how evidence-based guidelines are generated over time.”

According to Dr. El-Khoury, fixing the laboratory reference range issues would likely require a joint effort of professional medical societies, reference laboratories, and assay manufacturers. But with seasonal variation, that might be a difficult task.

“The problem is, in laboratory medicine, we don’t have rules for an analyte that changes by season to do anything different. My goal is to get people to at least acknowledge this is a problem and do something,” he concluded.

Dr. El-Khoury and Dr. Cubb have reported no relevant financial relationships.
 

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

The Food and Drug Administration has approved Medtronic Minimed’s 780G automated insulin delivery system with the Guardian 4 sensor.

The latest so-called artificial pancreas system is approved for people aged 7 years and older who have type 1 diabetes. Medtronic will begin taking preorders for the 780G on May 15, 2023. Users of the current MiniMed 770G will be eligible for no-cost remote software upgrades.

Olivier Le Moal/Getty Images

The 780G is currently available in 105 countries. It has been available in Europe since 2020 and in the United Kingdom since 2021. It is the first automated insulin delivery system to automatically administer bolus correction insulin doses every 5 minutes to correct meal-related hyperglycemia.

This so-called meal detection technology doesn’t replace manual premeal boluses but does provide extra insulin if the premeal bolus is skipped or is insufficient.

As with other automated systems, the 780G automatically adjusts basal insulin doses up or down based on glucose levels and trends and shuts off insulin delivery to prevent hypoglycemia. The insulin pump’s infusion set can be worn for 7 days, rather than 3 days as with the older system, and the glucose target level can be set as low as 100 mg/dL.

And in contrast to the older MiniMed 670G system, which tended to frequently boot users out of automated mode, with the 780G, users spent an average of 95% of the time in the automated “SmartGuard” mode.

In the pivotal U.S. trial, overall, patients who used the 780G spent 75% of the time in ideal glucose range (70-180 mg/dL) and 1.8% of the time below that range. Overnight, the figures were 82% and 1.5%, respectively. With the glucose target set at 100 mg/dL and active insulin time set to 2 hours, patients spent 78.8% of time in range without increased hyperglycemia.

In the ADAPT study, with the 780G, there was a 26% increase in time in ideal glucose range and a 1.4% reduction in A1c compared with results for patients who received multiple daily insulin injections with intermittently scanned continuous glucose monitoring, without an increase in hypoglycemia. Overnight, time in range increased 30.2%. The results were sustained at 1 year.

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

The Food and Drug Administration has approved Medtronic Minimed’s 780G automated insulin delivery system with the Guardian 4 sensor.

The latest so-called artificial pancreas system is approved for people aged 7 years and older who have type 1 diabetes. Medtronic will begin taking preorders for the 780G on May 15, 2023. Users of the current MiniMed 770G will be eligible for no-cost remote software upgrades.

Olivier Le Moal/Getty Images

The 780G is currently available in 105 countries. It has been available in Europe since 2020 and in the United Kingdom since 2021. It is the first automated insulin delivery system to automatically administer bolus correction insulin doses every 5 minutes to correct meal-related hyperglycemia.

This so-called meal detection technology doesn’t replace manual premeal boluses but does provide extra insulin if the premeal bolus is skipped or is insufficient.

As with other automated systems, the 780G automatically adjusts basal insulin doses up or down based on glucose levels and trends and shuts off insulin delivery to prevent hypoglycemia. The insulin pump’s infusion set can be worn for 7 days, rather than 3 days as with the older system, and the glucose target level can be set as low as 100 mg/dL.

And in contrast to the older MiniMed 670G system, which tended to frequently boot users out of automated mode, with the 780G, users spent an average of 95% of the time in the automated “SmartGuard” mode.

In the pivotal U.S. trial, overall, patients who used the 780G spent 75% of the time in ideal glucose range (70-180 mg/dL) and 1.8% of the time below that range. Overnight, the figures were 82% and 1.5%, respectively. With the glucose target set at 100 mg/dL and active insulin time set to 2 hours, patients spent 78.8% of time in range without increased hyperglycemia.

In the ADAPT study, with the 780G, there was a 26% increase in time in ideal glucose range and a 1.4% reduction in A1c compared with results for patients who received multiple daily insulin injections with intermittently scanned continuous glucose monitoring, without an increase in hypoglycemia. Overnight, time in range increased 30.2%. The results were sustained at 1 year.

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

The Food and Drug Administration has approved Medtronic Minimed’s 780G automated insulin delivery system with the Guardian 4 sensor.

The latest so-called artificial pancreas system is approved for people aged 7 years and older who have type 1 diabetes. Medtronic will begin taking preorders for the 780G on May 15, 2023. Users of the current MiniMed 770G will be eligible for no-cost remote software upgrades.

Olivier Le Moal/Getty Images

The 780G is currently available in 105 countries. It has been available in Europe since 2020 and in the United Kingdom since 2021. It is the first automated insulin delivery system to automatically administer bolus correction insulin doses every 5 minutes to correct meal-related hyperglycemia.

This so-called meal detection technology doesn’t replace manual premeal boluses but does provide extra insulin if the premeal bolus is skipped or is insufficient.

As with other automated systems, the 780G automatically adjusts basal insulin doses up or down based on glucose levels and trends and shuts off insulin delivery to prevent hypoglycemia. The insulin pump’s infusion set can be worn for 7 days, rather than 3 days as with the older system, and the glucose target level can be set as low as 100 mg/dL.

And in contrast to the older MiniMed 670G system, which tended to frequently boot users out of automated mode, with the 780G, users spent an average of 95% of the time in the automated “SmartGuard” mode.

In the pivotal U.S. trial, overall, patients who used the 780G spent 75% of the time in ideal glucose range (70-180 mg/dL) and 1.8% of the time below that range. Overnight, the figures were 82% and 1.5%, respectively. With the glucose target set at 100 mg/dL and active insulin time set to 2 hours, patients spent 78.8% of time in range without increased hyperglycemia.

In the ADAPT study, with the 780G, there was a 26% increase in time in ideal glucose range and a 1.4% reduction in A1c compared with results for patients who received multiple daily insulin injections with intermittently scanned continuous glucose monitoring, without an increase in hypoglycemia. Overnight, time in range increased 30.2%. The results were sustained at 1 year.

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

BOSTON – The neurologic symptoms of long COVID appear to be explained by a phenomenon known as antigenic imprinting, which involves a misdirected immune response to the SARS-CoV2 virus, according to a collaborative study presented at the 2023 annual meeting of the American Academy of Neurology.

Already documented in several other viral infections, such as influenza and human immunodeficiency virus, antigenic imprinting results in production of antibodies to previously encountered viral infections rather than to the immediate threat, according to Marianna Spatola, MD, PhD, a research fellow at the Ragon Institute, Harvard University, Cambridge, Mass.
 

Original antigenic sin

In the case of persistent neurologic symptoms after COVID, a condition known as neuroPASC (neurological postacute sequelae of SARS-CoV2 infection), antibodies produced for previously encountered coronaviruses rather than for SARS-CoV2 might explain most or all cases, according to the data Dr. Spatola presented.

The evidence for this explanation was drawn from a study of 112 patients evaluated months after an acute episode of COVID-19. Of these, 18 patients had persistent neurologic dysfunction. When compared with the 94 whose infection resolved without sequelae, the patients with prolonged neurologic impairments had relatively low systemic antibody response to SARS-CoV2. However, they showed relatively high antibody responses against other coronaviruses.

This is a pattern consistent with antigenic imprinting, a concept first described more than 60 years ago as original antigenic sin. When the immune system becomes imprinted with an antigen from the first encountered virus from a family of pathogens, it governs all subsequent antibody responses, according to several published studies that have described and evaluated this concept.
 

Additional evidence

In Dr. Spatola’s study, other differences, particularly in regard to the cerebrospinal fluid (CSF), further supported the role of antigenic imprinting as a cause of neuroPASC. For one, those with elevated immune responses to other common coronaviruses rather than SARS-CoV2 in the CSF relative to the periphery were more likely to have a bad outcome in regard to neurologic symptoms.

Moreover, the CSF in neuroPASC patients “was characterized by increased IgG1 and absence of IgM, suggesting compartmentalized humoral responses within the CSF through selective transfer of antibodies from the serum to the CSF across the blood-brain barrier rather than through intrathecal synthesis,” Dr. Spatola reported.

In the case of COVID-19, the propensity for antigenic imprinting is not difficult to understand.

“The common cold coronaviruses are pretty similar to SARS-CoV2, but they are not exactly the same,” Dr. Spatola said. Her work and studies by others suggest that when antigenic imprinting occurs, “it prevents full maturation of the antibody response.”

NeuroPASC is one of many manifestations of long COVID, but Dr. Spatola pointed out that the immune response in the CSF is unique and the causes of prolonged neurologic impairment after COVID-19 are likely to involve different mechanisms than other long-COVID symptoms.

“Antibodies in the brain are functionally different,” said Dr. Spatola, noting for example that antibody-directed defenses against viral threats show a greater relative reliance on phagocytosis. This might become important in the development of therapeutics for neurologic symptoms of long COVID.
 

A different phenomenon

The manifestations of neuroPASC are heterogeneous and can include confusion, cognitive dysfunction, headache, encephalitis, and other impairments. Neurologic symptoms occur during acute SARS-CoV2 infections, but neuroPASC appears to be a different phenomenon. These symptoms, which develop after the initial respiratory disease has resolved, were attributed by Dr. Spatola to persistent inflammation that is not necessarily directly related to ongoing infection.

“The reason why some patients develop neuroPASC is unknown, but I think the evidence has pointed to a role for the immune system rather than the virus itself,” Dr. Spatola said.

Currently, neuroPASC is a clinical diagnosis but Dr. Spatola and her coinvestigators are conducting research to identify biomarkers. A viable diagnostic test is not expected imminently. They have identified 150 different features with potential relevance to neuroPASC.

In their comparison of those who did relative to those who did not develop neuroPASC, the initial studies were undertaken 2-4 months after the acute COVID-19 symptoms had resolved. The patients with neuroPASC and those without neurologic sequelae have now been followed for 6-8 months, which Dr. Spatola said was too short to draw firm conclusions about outcomes.
 

An evolving concept

Despite the small sample size of this study, these are “very interesting data” for considering the pathogenesis of neuroPASC, which is “a concept that is still evolving,” according to Natalia S. Rost, MD, chief of the stroke division, department of neurology, Massachusetts General Hospital, Boston.

Applied to SARS-CoV2, the concept of original antigenic sin “is new” but Dr. Rost said that it might help differentiate neuroPASC from acute neurologic symptoms of COVID-19, which include stroke. She indicated that the work performed by Dr. Spatola and others might eventually explain the pathology while leading to treatment strategies. She cautioned that the concepts explored in this study “need to be further developed” through larger sample sizes and the exploration of other variables that support the hypothesis.

Dr. Spatola and Dr. Rost report no potential conflicts of interest.

BOSTON – The neurologic symptoms of long COVID appear to be explained by a phenomenon known as antigenic imprinting, which involves a misdirected immune response to the SARS-CoV2 virus, according to a collaborative study presented at the 2023 annual meeting of the American Academy of Neurology.

Already documented in several other viral infections, such as influenza and human immunodeficiency virus, antigenic imprinting results in production of antibodies to previously encountered viral infections rather than to the immediate threat, according to Marianna Spatola, MD, PhD, a research fellow at the Ragon Institute, Harvard University, Cambridge, Mass.
 

Original antigenic sin

In the case of persistent neurologic symptoms after COVID, a condition known as neuroPASC (neurological postacute sequelae of SARS-CoV2 infection), antibodies produced for previously encountered coronaviruses rather than for SARS-CoV2 might explain most or all cases, according to the data Dr. Spatola presented.

The evidence for this explanation was drawn from a study of 112 patients evaluated months after an acute episode of COVID-19. Of these, 18 patients had persistent neurologic dysfunction. When compared with the 94 whose infection resolved without sequelae, the patients with prolonged neurologic impairments had relatively low systemic antibody response to SARS-CoV2. However, they showed relatively high antibody responses against other coronaviruses.

This is a pattern consistent with antigenic imprinting, a concept first described more than 60 years ago as original antigenic sin. When the immune system becomes imprinted with an antigen from the first encountered virus from a family of pathogens, it governs all subsequent antibody responses, according to several published studies that have described and evaluated this concept.
 

Additional evidence

In Dr. Spatola’s study, other differences, particularly in regard to the cerebrospinal fluid (CSF), further supported the role of antigenic imprinting as a cause of neuroPASC. For one, those with elevated immune responses to other common coronaviruses rather than SARS-CoV2 in the CSF relative to the periphery were more likely to have a bad outcome in regard to neurologic symptoms.

Moreover, the CSF in neuroPASC patients “was characterized by increased IgG1 and absence of IgM, suggesting compartmentalized humoral responses within the CSF through selective transfer of antibodies from the serum to the CSF across the blood-brain barrier rather than through intrathecal synthesis,” Dr. Spatola reported.

In the case of COVID-19, the propensity for antigenic imprinting is not difficult to understand.

“The common cold coronaviruses are pretty similar to SARS-CoV2, but they are not exactly the same,” Dr. Spatola said. Her work and studies by others suggest that when antigenic imprinting occurs, “it prevents full maturation of the antibody response.”

NeuroPASC is one of many manifestations of long COVID, but Dr. Spatola pointed out that the immune response in the CSF is unique and the causes of prolonged neurologic impairment after COVID-19 are likely to involve different mechanisms than other long-COVID symptoms.

“Antibodies in the brain are functionally different,” said Dr. Spatola, noting for example that antibody-directed defenses against viral threats show a greater relative reliance on phagocytosis. This might become important in the development of therapeutics for neurologic symptoms of long COVID.
 

A different phenomenon

The manifestations of neuroPASC are heterogeneous and can include confusion, cognitive dysfunction, headache, encephalitis, and other impairments. Neurologic symptoms occur during acute SARS-CoV2 infections, but neuroPASC appears to be a different phenomenon. These symptoms, which develop after the initial respiratory disease has resolved, were attributed by Dr. Spatola to persistent inflammation that is not necessarily directly related to ongoing infection.

“The reason why some patients develop neuroPASC is unknown, but I think the evidence has pointed to a role for the immune system rather than the virus itself,” Dr. Spatola said.

Currently, neuroPASC is a clinical diagnosis but Dr. Spatola and her coinvestigators are conducting research to identify biomarkers. A viable diagnostic test is not expected imminently. They have identified 150 different features with potential relevance to neuroPASC.

In their comparison of those who did relative to those who did not develop neuroPASC, the initial studies were undertaken 2-4 months after the acute COVID-19 symptoms had resolved. The patients with neuroPASC and those without neurologic sequelae have now been followed for 6-8 months, which Dr. Spatola said was too short to draw firm conclusions about outcomes.
 

An evolving concept

Despite the small sample size of this study, these are “very interesting data” for considering the pathogenesis of neuroPASC, which is “a concept that is still evolving,” according to Natalia S. Rost, MD, chief of the stroke division, department of neurology, Massachusetts General Hospital, Boston.

Applied to SARS-CoV2, the concept of original antigenic sin “is new” but Dr. Rost said that it might help differentiate neuroPASC from acute neurologic symptoms of COVID-19, which include stroke. She indicated that the work performed by Dr. Spatola and others might eventually explain the pathology while leading to treatment strategies. She cautioned that the concepts explored in this study “need to be further developed” through larger sample sizes and the exploration of other variables that support the hypothesis.

Dr. Spatola and Dr. Rost report no potential conflicts of interest.

BOSTON – The neurologic symptoms of long COVID appear to be explained by a phenomenon known as antigenic imprinting, which involves a misdirected immune response to the SARS-CoV2 virus, according to a collaborative study presented at the 2023 annual meeting of the American Academy of Neurology.

Already documented in several other viral infections, such as influenza and human immunodeficiency virus, antigenic imprinting results in production of antibodies to previously encountered viral infections rather than to the immediate threat, according to Marianna Spatola, MD, PhD, a research fellow at the Ragon Institute, Harvard University, Cambridge, Mass.
 

Original antigenic sin

In the case of persistent neurologic symptoms after COVID, a condition known as neuroPASC (neurological postacute sequelae of SARS-CoV2 infection), antibodies produced for previously encountered coronaviruses rather than for SARS-CoV2 might explain most or all cases, according to the data Dr. Spatola presented.

The evidence for this explanation was drawn from a study of 112 patients evaluated months after an acute episode of COVID-19. Of these, 18 patients had persistent neurologic dysfunction. When compared with the 94 whose infection resolved without sequelae, the patients with prolonged neurologic impairments had relatively low systemic antibody response to SARS-CoV2. However, they showed relatively high antibody responses against other coronaviruses.

This is a pattern consistent with antigenic imprinting, a concept first described more than 60 years ago as original antigenic sin. When the immune system becomes imprinted with an antigen from the first encountered virus from a family of pathogens, it governs all subsequent antibody responses, according to several published studies that have described and evaluated this concept.
 

Additional evidence

In Dr. Spatola’s study, other differences, particularly in regard to the cerebrospinal fluid (CSF), further supported the role of antigenic imprinting as a cause of neuroPASC. For one, those with elevated immune responses to other common coronaviruses rather than SARS-CoV2 in the CSF relative to the periphery were more likely to have a bad outcome in regard to neurologic symptoms.

Moreover, the CSF in neuroPASC patients “was characterized by increased IgG1 and absence of IgM, suggesting compartmentalized humoral responses within the CSF through selective transfer of antibodies from the serum to the CSF across the blood-brain barrier rather than through intrathecal synthesis,” Dr. Spatola reported.

In the case of COVID-19, the propensity for antigenic imprinting is not difficult to understand.

“The common cold coronaviruses are pretty similar to SARS-CoV2, but they are not exactly the same,” Dr. Spatola said. Her work and studies by others suggest that when antigenic imprinting occurs, “it prevents full maturation of the antibody response.”

NeuroPASC is one of many manifestations of long COVID, but Dr. Spatola pointed out that the immune response in the CSF is unique and the causes of prolonged neurologic impairment after COVID-19 are likely to involve different mechanisms than other long-COVID symptoms.

“Antibodies in the brain are functionally different,” said Dr. Spatola, noting for example that antibody-directed defenses against viral threats show a greater relative reliance on phagocytosis. This might become important in the development of therapeutics for neurologic symptoms of long COVID.
 

A different phenomenon

The manifestations of neuroPASC are heterogeneous and can include confusion, cognitive dysfunction, headache, encephalitis, and other impairments. Neurologic symptoms occur during acute SARS-CoV2 infections, but neuroPASC appears to be a different phenomenon. These symptoms, which develop after the initial respiratory disease has resolved, were attributed by Dr. Spatola to persistent inflammation that is not necessarily directly related to ongoing infection.

“The reason why some patients develop neuroPASC is unknown, but I think the evidence has pointed to a role for the immune system rather than the virus itself,” Dr. Spatola said.

Currently, neuroPASC is a clinical diagnosis but Dr. Spatola and her coinvestigators are conducting research to identify biomarkers. A viable diagnostic test is not expected imminently. They have identified 150 different features with potential relevance to neuroPASC.

In their comparison of those who did relative to those who did not develop neuroPASC, the initial studies were undertaken 2-4 months after the acute COVID-19 symptoms had resolved. The patients with neuroPASC and those without neurologic sequelae have now been followed for 6-8 months, which Dr. Spatola said was too short to draw firm conclusions about outcomes.
 

An evolving concept

Despite the small sample size of this study, these are “very interesting data” for considering the pathogenesis of neuroPASC, which is “a concept that is still evolving,” according to Natalia S. Rost, MD, chief of the stroke division, department of neurology, Massachusetts General Hospital, Boston.

Applied to SARS-CoV2, the concept of original antigenic sin “is new” but Dr. Rost said that it might help differentiate neuroPASC from acute neurologic symptoms of COVID-19, which include stroke. She indicated that the work performed by Dr. Spatola and others might eventually explain the pathology while leading to treatment strategies. She cautioned that the concepts explored in this study “need to be further developed” through larger sample sizes and the exploration of other variables that support the hypothesis.

Dr. Spatola and Dr. Rost report no potential conflicts of interest.