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Assessing Heat Related Multiple Sclerosis Symptoms

March 20th, 2008 Medgadget Editors News

Researchers at UT Southwestern Medical Center have been working on a method to gauge the severity of the Uhthoff’s phenomenon, a symptomatic condition in multiple sclerosis patients in which increased body heat is exacerbating a number of symptoms like fatigue and motor deficiencies. It is a well known fact that some MS patients cannot tolerate hot showers, as it makes them feel sick.

Although doctors and researchers have long known about Uhthoff’s phenomenon, there has been no way to objectively measure its severity or how it is related to body temperature.
The UT Southwestern study, available online and appearing in the March 25 edition of the journal <em>Neurology</em>, demonstrated that as body temperature rises, the severity of an eye-movement disorder called INO, or internuclear ophthalmoparesis, also increases. When a person with INO looks rapidly from one object to another, one eye moves more slowly than the other. Normally, the eyes move at the same speed.
INO can serve as an easy-to-measure “canary in a coal mine,” acting as a surrogate for other heat-related symptoms that are harder to measure, such as fatigue, mental confusion or bladder or bowel problems, said Dr. Elliot Frohman, professor of neurology and ophthalmology, director of the Multiple Sclerosis Program and Multiple Sclerosis Clinical Center at UT Southwestern and senior author of the study.
The researchers’ tools were a whole-body suit, riddled with tubes for circulation of water, that can change body temperature; a pill-like thermometer that measures core body temperature after being swallowed; and an infrared camera that painlessly tracks eye movements.
The study, conducted at UT Southwestern, included eight patients with MS who have INO, eight with MS but not INO, and eight healthy control subjects. Warm water in the body garment raised each subject’s normal temperature by one-half of a degree Celsius, and the cool water brought it down by one-half of a degree.
The subjects also wore a lightweight device, fitted on a headband, that used infrared light to track their eye movements as they followed a random sequence of blinking lights.
In the subjects with INO, increasing the body temperature worsened the differences between their two eyes’ relative motion. Conversely, cooling the body made the eyes synchronize better.

UT Southwestern press release: Eye test peers into heat-related multiple sclerosis symptoms

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Medical technologies transform the world! Join us and see the progress in real time. At Medgadget, we report the latest technology news, interview leaders in the field, and file dispatches from medical events around the world since 2004.

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