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Should Parkinson's Patients Drive?

Latest Study Adds to Research That Disease Impairs Ability
By
WebMD Health News

Dec. 9, 2002 -- A growing body of scientific research is confirming what common sense implies -- Parkinson's patients can be dangerous behind the wheel. Yet aside from a doctor's suggestion, there is nothing to prevent most licensed patients with this degenerative disease to drive.

"The are no rules, laws, or regulations that concern driving for people with Parkinson's disease," says neurologist Abraham Lieberman, MD, medical director of the National Parkinson's Foundation and a professor of neurology of the University of Miami School of Medicine. "The issue of driving and Parkinson's disease is one that has been looked into, but never in a way as seriously as with epilepsy. And I'm not sure that it will anytime soon."

But the latest study on the issue, published in the Dec. 10 Neurology, suggests that perhaps it should. Researchers found a direct link in the likelihood of driving accidents with the disease's progression. Nearly all of the 39 Parkinson's patients who were tested in a driving simulator were involved in collisions. And while most of them admitted the disease made it harder to operate a car, half continued their pre-diagnosis driving habits with no reduction in time behind the wheel.

"What was surprising, based on our and previous studies, is that the patients didn't have a good feeling or understanding on how bad their driving really was," says lead researcher Theresa A. Zesiewicz, MD, of the Parkinson's Disease and Movement Disorders Center at the University of South Florida College of Medicine. "But I wasn't surprised by the (accident) results."

Those who still drove regularly and had accidents during the test were older and had more advanced disease. "We found it particularly interesting that there was no relationship between Parkinson's patients' self-reporting of moving violations and their total collisions on the driving simulator."

Zesiewicz' study comes just six months after Austrian researchers reported that one in three Parkinson's patients in their study suffered from medication-caused attacks that caused them to suddenly fall asleep. That finding, in the British Medical Journal, backs a 1999 report by neurologist Steven Frucht, MD, that first implicated the drugs with sudden sleep attacks. In his paper, he noted that eight Parkinson's patients studied actually fell asleep behind the wheel.

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