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Mayo Clinic Studies Find REM Sleep Behavior Disorder is Associated with Other Features of Neurodegenerative Disorders
Date:4/15/2008

ROCHESTER, Minn., April 15, 2008 /PRNewswire-USNewswire/ -- Three new Mayo Clinic studies find that REM (rapid eye movement) sleep behavior disorder is associated with anxiety, apathy, lower scores in attention and executive functioning, as well as symptoms of Parkinson's disease. The findings will be presented at the American Academy of Neurology Annual Meeting in Chicago on April 15.

People who have REM sleep behavior disorder (RBD) appear to act out their dreams, which often are unpleasant and violent. Acting out is caused by a loss of normal muscle paralysis in REM sleep, the stage of sleep when dreaming occurs. A relatively uncommon condition, RBD is estimated to affect approximately 0.5 percent of the population, but occurs most frequently in older males.

"Previous studies have shown that some patients with RBD subsequently develop dementia and/or parkinsonism, which typically reflects a neurodegenerative disorder such as Lewy body dementia or Parkinson's disease," says Bradley Boeve, M.D., an author of these studies and a neurologist at Mayo Clinic. "Our knowledge on the RBD-neurodegenerative disease association is largely based on studies focused on single patients, or small groups of patients, with RBD. There are very few studies that have been carried out on RBD on a large scale. Plus, we currently aren't able to identify which patients with RBD will later develop other features of a neurodegenerative disease and which patients with RBD will not. We therefore sought to study RBD and other features commonly associated with Lewy body dementia and Parkinson's disease in a large population-based study."

Dr. Boeve and a team of Mayo Clinic physicians set out to determine whether cognitively-normal individuals with RBD have other features commonly associated with Lewy body dementia and Parkinson's disease. They identified 765 individuals, ages 70 to 89, who underwent a battery of scales and tests. Using the Mayo sleep questionna
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