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Vascular risk linked to long-term antiepileptic drug therapy
Date:11/14/2011

New research reveals that patients with epilepsy who were treated for extended periods with older generation antiepileptic drugs (AEDs) may be at increased risk for developing atherosclerosis, a common disorder known as hardening of the arteries. According to the findings now available in Epilepsia, the journal of the International League Against Epilepsy (ILAE), the vascular risk is significantly associated with the duration of AED monotherapy.

While the majority of epilepsy patients have good results with treatment, more than 30% of patients continue to have seizures even with AED therapy. In these cases of refractory epilepsy, long-term or lifelong AED therapy is needed. Prolonged treatment can lead to diabetes, thyroid issues, psychiatric problems and adverse drug reactions. Prior studies suggest that older-generation AEDs such as phenytoin, carbamazepine, phenobarbital, and valproic acid may alter metabolic pathways, contributing to increased vascular risks.

Lead author, Dr. Yao-Chung Chuang from Kaohsiung Chang Gung Memorial Hospital in Taiwan, and colleagues compared the long-term impact of different categories of AED monotherapy on atherosclerosis development. The team recruited 160 adult patients with epilepsy who had received AED monotherapy for more than 2 years, along with 60 healthy controls. Ultrasonography was used to measure participants' common carotid artery (CCA) intima media thickness (IMT) -- a measurement used to assess the extent of atherosclerosis.

"Our study found patients with epilepsy who were under long-term monotherpy with phenytoin, carbamazepine and valproic acid displayed significantly increased CCA IMT measurements," said Dr. Chuang. "These altered circulatory markers from prolonged AED therapy may accelerate the atherosclerotic process." Analysis showed that CCA IMT is positively correlated with the duration of AED therapy.

Researchers also investigated specific vascular risk factor
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Contact: Dawn Peters
healthnews@wiley.com
781-388-8408
Wiley-Blackwell
Source:Eurekalert

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