Migraine-related seizures in an epileptic population.

A relationship between epilepsy and migraine has long been postulated, but the nature of this interaction is still debated. We studied adult patients with epilepsy and investigated the relationship between migraine and epilepsy. Fourteen percent (n = 412) of adult patients with seizures were identified with a diagnosis of migraine. We also found a direct relationship between migraine and epilepsy (a migraine-induced epilepsy) in 1.7% (seven patients) of the patients with seizures. Patients were at increased risk for both conditions if they had migraine with aura and catamenial epilepsy. The seizure began during or shortly after the migraine aura in all of the cases and preceded the headache. Three of four patients who were refractory to management with antiepileptic drugs using either mono or combination therapy improved seizure control with combination antimigraine and antiepileptic drugs.