Acute prolonged confusion in later life as an ictal state.

Six patients ranging in age from 42 to 69 with no prior history of seizure disorder presented an acute prolonged or intermittent confusional state, with or without psychotic symptoms, as an ictal manifestation. The EEGs demonstrated protracted generalized spike and wave discharges, but full diagnostic evaluation disclosed no evident cause for the seizures. All promptly responded to small amounts of intravenous diazepam and subsequent oral phenytoin and phenobarbital. Three of the six patients had focal spike or sharp wave discharges on EEGs recorded subsequently, suggesting that the episodes may reflect secondary generalized seizures in some cases. These cases do not fit in the classic category of petit mal status and appear to be a distinct entity.