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Parkinson's drug linked to heart disease risk factor

DALLAS - Feb. 19, 2003 A drug used for the last 40 years to treat Parkinson's disease increases blood levels of an amino acid that could put patients at increased risk for heart disease, according to researchers at UT Southwestern Medical Center at Dallas.

Doctors have suspected that the drug levodopa can elevate body levels of the amino acid homocysteine, which is associated with an increased risk of heart disease and stroke, said Dr. Ramon Diaz-Arrastia, associate professor of neurology.

In a study published in the Archives of Neurology, Diaz-Arrastia and his colleagues measured homocysteine levels in blood samples from 235 Parkinson's patients, including 201 who had been treated with levodopa.

"We did find that there is a statistically modest increased risk of heart disease in Parkinson's patients with elevated homocysteine," Diaz-Arrastia said.

The findings imply that patients being treated with levodopa should ask their neurologists to monitor the level of homocysteine in their blood, particularly if they are at risk for heart disease, Diaz-Arrastia said.

The conclusions should not prevent people from using levodopa, he said.

"This medicine is necessary for parkinsonism," Diaz-Arrastia said. "It is very effective therapy, but physicians may need to pay attention to their patients' homocysteine levels."

Parkinson's disease leads to a reduction of dopamine, a brain chemical vital for controlling body movement. As a result, patients suffer from muscle tremors, rigidity of movement, and balance and coordination problems. Levodopa alleviates symptoms by replenishing lost stores of dopamine in the brain, but the drug does not cure the disorder or slow its progression.

Participants in the study who had received levodopa showed significantly higher levels of homocysteine in their blood than people who had not taken the drug. Patients with the highest homocysteine levels had an increased prevalence of cor
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Contact: Rachel Horton
rachel.horton@utsouthwestern.edu
214-648-3404
UT Southwestern Medical Center
19-Feb-2003


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