Age - 43, Male, came to us with long history of drug-resistant partial epilepsy. His first seizure occurred at 5 years. Since then, he was treated with multiple antiepileptic drugs resulting only in short periods of seizure freedom.
He reported daily seizures averaging 6/day, in spite of an adequate dosage of levetiracetam, lamotrigine, and phenytoin. His past medical history included gastroesophageal reflux disease treated with famotidine. What treatment procedure should be followed?