Abstract
We reviewed a group of 124 patients who were seizure-free after epilepsy surgery to determine the relative accuracy for identifying epileptogenic foci with (a) interictal scalp recordings, (b) ictal scalp recordings, and (c) ictal subdural electrode recordings. If considering only patients undergoing temporal lobe surgery, ictal subdural strip recordings were accurate in 100% of cases. Ictal scalp recordings were accurate in 44% of cases, whereas interictal scalp recordings were accurate in only 31% of cases. The data also indicate that noninvasive recordings have a false lateralization or localization error rate of 10% when used for identifying unilateral epileptogenic foci in preparation for epilepsy surgery.
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