Patterns of treatment response in newly diagnosed epilepsy

Objective: To delineate the temporal patterns of outcome and to determine the probability of seizure freedom with successive antiepileptic drug regimens in newly diagnosed epilepsy. Methods: Patients in whom epilepsy was diagnosed and the first antiepileptic drug prescribed between July 1, 1982 and April 1, 2006, were followed up until March 31, 2008. Outcomes were categorized into four patterns: (A)early and sustained seizure freedom; (B)delayed but sustained seizure freedom; (C)fluctuation between periods of seizure freedom and relapse; (D)seizure freedom never attained. Probability of seizure freedom with successive drug regimens was compared. Seizure freedom was defined as no seizures for >1 year. Results: A total of 1,098 patients were included (median age 32 years, range 9 to 93). At the last clinic visit, 749(68 patients were seizure-free, 678(62 on monotherapy. Outcome pattern A was observed in 408(37, pattern B in 246(22, pattern C in 172(16 and pattern D in 272(25 patients. There was a higher probability of seizure freedom in patients receiving one compared to two drug regimens, and two compared to three regimens (p<0.001). The difference was greater among patients with symptomatic or cryptogenic than with idiopathic epilepsy. Less than 2% of patients became seizure-free on subsequent regimens but a few did so on their sixth or seventh regimen. Conclusions: Most patients with newly diagnosed epilepsy had a constant course which could usually be predicted early. The chance of seizure freedom declined with successive drug regimens, most markedly from the first to the third and among patients with localization-related epilepsies.