The autonomic nervous function of the cardiovascular system was investigated by non-invasive methods in 30 multiple sclerosis patients between 20 and 50 years of age. The results were compared to those of 30 healthy controls in the same age group. Minor abnormalities of parasympathetic and sympathetic function occurred. Heart rate variation at deep breathing was reduced and more than half of the patients had abnormal responses during an orthostatic procedure, mainly as an increased rise in heart rate. Decreased rise in blood pressure at sustained handgrip was also demonstrated. The abnormalities correlated poorly with other clinical signs and symptoms in the patients.
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