JOURNAL ARTICLE
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
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A progressive sequence of electroencephalographic changes during generalized convulsive status epilepticus.

Review of 60 electroencephalograms recorded during episodes of generalized convulsive status epilepticus suggested that there are 5 identifiable EEG patterns which occur in a predictable sequence during the course of generalized convulsive status epilepticus in man: (1) discrete seizures; (2) merging seizures with waxing and waning amplitude and frequency of EEG rhythms; (3) continuous ictal activity; (4) continuous ictal activity punctuated by low voltage 'flat periods'; and (5) periodic epileptiform discharges on a 'flat' background. We confirmed our hypothesis that this sequence represents the natural history of electroencephalographic changes in untreated generalized convulsive status epilepticus by observing the same sequence in the EEGs of rats in which status epilepticus had been induced by 3 different methods: (1) systemic administration of kainic acid, (2) injection of homocysteine thiolactone to cobalt-lesioned rats; and (3) injection of lithium chloride followed 24 h later by injection of pilocarpine.

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