MINNEAPOLIS, March 3, 2021 /PRNewswire/ -- As average temperatures around the globe climb, a preliminary study has found people with multiple sclerosis (MS) may expect worsening symptoms, enough to send them to the hospital more often. The preliminary study released March 2, 2021 will be presented at the American Academy of Neurology's 73rd Annual Meeting being held virtually April 17 to April 22, 2021.
"We know that heat sensitivity is common in multiple sclerosis, and climate scientists expect that periods of anomalously warm weather will become more frequent with climate change," said study author Holly Elser, Ph.D., of Stanford University School of Medicine in Stanford, Calif., and a member of the American Academy of Neurology. "Our study suggests that warming trends could have serious health implications over the long term for people living with MS."
Anomalously warm weather was defined as any month in which local average temperatures were higher than the long-term average temperature for that month by at least 1.5 degrees Celsius, or almost 2 degrees Fahrenheit.
For the study, researchers looked at insurance claims for 106,225 people with MS living across the United States. Researchers calculated the estimated effect of anomalously warm weather on MS-related emergency department, inpatient and outpatient visits. Researchers then compared the number of medical visits for each person during periods of anomalously warm weather to periods of normal weather.
Researchers found that during periods of anomalously warm weather, participants had a 4% increased chance of having an emergency department visit compared to periods of normal weather. Participants had a 3% increased chance of having an inpatient visit and a 1% increased chance of having an outpatient visit during anomalously warm periods compared to periods of normal weather.
Researchers estimate that over the course of follow-up, periods of anomalously warm weather were associated with an estimated excess of at least 592 emergency department visits, 1,260 inpatient visits and 1,960 outpatient visits related to MS.
"While the relative increase in risk of visits is small, the associated absolute effect on people with MS and the health care system is meaningful," Elser said.
Limitations of the study include that the study was retrospective and that researchers had no direct way to measure peoples' symptoms.
The study was supported by the National Institute of Environmental Health Sciences and the National Institute on Drug Abuse.
Learn more about MS at BrainandLife.org, home of the American Academy of Neurology's free patient and caregiver magazine focused on the intersection of neurologic disease and brain health. Follow Brain & Life® on Facebook, Twitter and Instagram.
When posting to social media channels about this research, we encourage you to use the American Academy of Neurology's Annual Meeting hashtag #AANAM.
The American Academy of Neurology is the world's largest association of neurologists and neuroscience professionals, with over 36,000 members. The AAN is dedicated to promoting the highest quality patient-centered neurologic care. A neurologist is a doctor with specialized training in diagnosing, treating and managing disorders of the brain and nervous system such as Alzheimer's disease, stroke, migraine, multiple sclerosis, concussion, Parkinson's disease and epilepsy.
For more information about the American Academy of Neurology, visit AAN.com or find us on Facebook, Twitter, Instagram, LinkedIn and YouTube.
SOURCE American Academy of Neurology
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