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Scalp EEG in Temporal Lobe Epilepsy Surgery

Published online by Cambridge University Press:  02 December 2014

Mark Sadler  and
Richard Desbiens
Mark Sadler
Affiliation:
Queen Elizabeth II Health Sciences Centre, Halifax, N.S.
Richard Desbiens
Affiliation:
Hôpital, de l'Enfant-Jésus, Quebec City, Quebec
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Abstract

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Electroencephalography (EEG) with standard scalp and additional noninvasive electrodes plays a major role in the selection of patients for temporal lobe epilepsy surgery. Recent studies have provided data supporting the value of interictal and postictal EEG in assessing the site of ictal onset. Scalp ictal rhythms are morphologically complex but at least one pattern (a five cycles/second rhythm maximum at the sphenoidal or anterior temporal electrode) occurs in >50% of patients and has a high predictive value and interobserver reliability for temporal lobe originating seizures. Thorough interictal and ictal scalp EEG evaluation, in conjunction with modern neuroimaging, is sufficient for proceeding to surgery without invasive recordings in some patients. Further studies are required to define the scalp ictal characteristics of mesial vs. lateral temporal lobe epilepsy.

Type
Research Article
Information
Canadian Journal of Neurological Sciences , Volume 27 , Issue S1: Canadian Temporal Lobe Epilepsy Surgery Workshop , May 2000 , pp. S22 - S28
Copyright
Copyright © The Canadian Journal of Neurological 2000

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