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Response to First Drug Treatment May Signal Likelihood of Future Seizures in People with Epilepsy
05/18/2012
MINNEAPOLIS – How well people with newly diagnosed epilepsy respond to their first drug treatment may signal the likelihood that they will continue to have more seizures, according to a study published in the May 9, 2012, online issue of Neurology®, the medical journal of the American Academy of Neurology.
“Our research shows a pattern based on how a person responds to initial treatment and specifically, to their first two courses of drug treatment,” said study author Patrick Kwan, MD, PhD, with the University of Melbourne in Australia.

For the study, 1,098 people from Scotland between the ages of nine and 93 with newly diagnosed epilepsy were followed for as long as 26 years after being given their first drug therapy. Participants were considered seizure-free if they had no seizures for at least a year without changes in their treatment. If they had further seizures, a second drug was chosen to be given alone or to be added to the first. If seizures continued, a third drug regimen was selected, and the process continued for up to nine drug regimens.

The study found that 50 percent of the people were seizure-free after the first drug tried, 13 percent were seizure-free after the second drug regiment tried and 4 percent were seizure-free after the third drug regimen tried. Less than two percent of the participants stopped having seizures on additional drug treatment courses up to the seventh one tried, and none became seizure-free after that.

The research also found that 37 percent of people in the study became seizure-free within six months of treatment. Another 22 percent became seizure-free after more than six months of starting treatment. Both groups continued to be seizure-free. However, 16 percent had fluctuating periods of seizure freedom and relapses, and 25 percent were never seizure-free for one year.

At the end of the study, 749 people (68 percent) were seizure-free and 678 people (62 percent) were on only one drug. The results were independent of the age when the person had the first seizure or the type of epilepsy.

“A person who doesn’t respond well to two courses of epilepsy drug treatment should be further evaluated to verify an epilepsy diagnosis and to identify whether surgery is the best next step,” said Patricia E. Penovich, MD, with the Minnesota Epilepsy Group PA and the University of Minnesota School of Medicine in St. Paul, Minn., and a Fellow with the American Academy of Neurology, who wrote an accompanying editorial on the study.

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