A case of minor seizure statuus of a 5 year old boy with diffuse slow waves on his electroencephalogram was described. Two of thre e members of his family were epileptics, the father has had psychomotor seizures, and the elder sister has had generalized tonic-clonic convulsions and attacks of headache. The patient had experienced sudden onset of pure petit mal attacks two weeks before the status, and the attacks gradually increaded in spite of DPA administration. Cloudiness of consciousness developed in a few hours, attained to coma, and gradually cleared to disappear within about 10 hours. The EEG showed irregular high voltage slow waves scattered with diffuse spikes, but rhythmic spike-wave burst, which was shown before and after the minor seizure status, was not observed. As the conscio usness cleared up, slow waves were taken place by faster waves and rhythmic spikewaves appeared. The attacks were effectively controled by ethosuccimide and phenobarbital.
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