QUANTITATIVE ELECTROCORTICOGRAPHY IN PATIENTS UNDERGOING TEMPORAL LOBECTOMY

We studied quantitative electrocorticography (ECoG) in 33 patients with medically refractory partial seizures who underwent temporal lobectomy. Preresection of ECoG revealed epileptiform abnormalities in areas that were not involved on scalp EEG in 8 patients. Twenty-six patients had epileptiform activity on ECoG posterior to the anticipated surgical margin. There were no significant outcome differences between patients with and without epileptiform activity on postresection ECoG. However, patients with 5 or less spikes on postresection ECoG had a better outcome (72.7% grade I or II) versus those with more than 5 spikes (54.5%)