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Department of Engineering Mathematics, University of Bristol, Bristol, UK.
We report findings concerning the relationship between electroencephalography (EEG) frequency during spike-and-wave discharges (SWDs) and response to treatment in 21 patients with idiopathic generalized epilepsy (IGE). We studied patients whose EEG contained SWDs lasting at least 4 s. Among these patients, two groups could be distinguished on the basis of a subtle difference in EEG frequency during the first 2 s of the burst. The two groups differed markedly in their clinical response to medication, with the group becoming seizure-free during the next 1-2 years showing a spike-wave onset frequency of > 3.2 Hz, and those not seizure-free < 3.2 Hz (p = 0.0034, sensitivity 75% and specificity 92%). Given this strong effect in a relatively small group, further work is needed to clarify the predictive value of this frequency measure for clinical outcomes in absence epilepsies.
Wiley Periodicals, Inc. © 2011 International League Against Epilepsy.
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