Idiopathic generalized epilepsies take many forms, but the best-known examples are childhood absence epilepsy and juvenile myoclonic epilepsy (JME). The seizure types of JME comprise morning myoclonus, generalized tonic-clonic seizures on awakening, and sometimes absences and photosensitivity, all more likely following sleep deprivation. The seizures typically begin in the teenage years, but the epilepsy tendency persists lifelong. The EEG shows interictal generalized polyspike-and-wave activity (Figure 2.2). The seizures usually respond well to valproate.
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