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Tuesday, May 13, 2014

Pain Intensity Contributes to Cognitive Dysfunction in Multiple Sclerosis -

"Pain" Intensity Contributes to Cognitive Dysfunction 
in Multiple Sclerosis 

By Katie Eder | May 03, 2014

  Among adult patients with multiple sclerosis (MS), pain severity can impact performance on cognitive tests, suggesting that pain independently contributes to impaired brain function in MS.   

For their pilot study presented at the American Pain Society 33rd Annual Scientific Meeting, held April 30, 2014, to May 3, 2014, in Tampa, FL, Anna L. Kratz, PhD, of the Center for Outcomes Development & Application in the Department of Physical Medicine and Rehabilitation at the University of Michigan, and Tiffany J. Braley, MD, MS, of Multiple Sclerosis and Sleep Disorders Centers in the Department of Neurology at the University of Michigan, examined the correlation between pain intensity and cognitive test scores in 40 adult patients diagnosed with MS and explored the underlying mechanisms among those elements, such as sleep duration. 

While previous studies have linked pain severity to cognitive functioning in the general population and determined that cognitive dysfunction is more common in those with chronic pain, the authors said “little has been done to explore symptoms that may exacerbate cognitive dysfunction in MS, including pain,” despite the fact that approximately two-thirds of MS patients have a chronic pain condition, 25% of whom experience severe chronic pain.   

Within the current research sample, 26 patients had relapsing-remitting MS, 9 had secondary-progressive MS, and 5 had primary-progressive MS. Subjects were excluded from the study if they demonstrated “severe cognitive impairment, severe depression, visual and/or hearing impairments, lack of independent mobility, use of medical treatment for obstructive sleep apnea (OSA), and drug and/or alcohol dependence,” Kratz and Braley said.   

During the study’s baseline visit, the investigators calculated the patients’ PROMIS Pain Intensity and Expanded Disability Status Scale (EDSS) scores and then showed them how to use a wrist-worn accelerometer, which continuously collected data on objective sleep parameters by recording ambient light and physical movements. In order to assess the association between pain and cognitive performance with and without sleep duration as a factor, the authors conducted the Controlled Oral Word Association Test (COWAT), Judgment of Line Orientation (JLO) test, and the Symbol Digit Modalities Test (SDMT) on the patients.


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