Prospective, double-blind, randomized-controlled study for pediatric cases scheduled for brain tumor excision with the aid of electrocorticography (ECOG). Intraoperative ECOG has been used in an effort to localize the site of epileptogenicity through the demonstration of Interictal Epileptiform Discharges (IED) persistence, frequency, and distribution. During ECOG, pharmaco-activation may be required in order to activate Interictal Epileptiform Abnormalities (IEAs). Frequency of IEAs will be measured for each drug.
The effects of anesthetic agents on intraoperative ECOG, as we assume that fentanyl will be superior to ketamine.