Evaluation of Treatment in Typical Absence Seizures: The Roles of Long‐term EEG Monitoring and Ethosuximide

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Abstract
Eleven children with typical absence seizures were studied clinically and by repeated 24-h EEGs with a portable cassette tape recorder before and during anticonvulsant treatment. The history, observation of seizures and amount of spike-and-wave activity (episodes > 3 sec) were studied in relation to the plasma levels. The EEG revealed spike-and-wave episodes, considered as seizures, in a higher frequency than the number of absences reported by the parents. Twenty-four EEG recording was, however, not superior to long-term observation by relatives in establishing freedom from absences. The drug primary used was ethosuximide. Eight of 11 children responded completely on this drug, i.e., no absences observed and EEG was normalized. Of 2 children in whom the therapy was changed to sodium valproate, 1 responded completely and 1 partly. The relation between the ethosuximide dosage given and the plasma concentration level was good. Two cases responded at low plasma levels (< 200 .mu.mol/l). Tonic-clonic seizures occurred in 3/11 children.