The Epilepsy Surgery Outcome Scale is used to classify outcome after surgical treatment for medically refractory outcome. From the Mass General Epilepsy Service Protocols & Guidelines.

Engel Epilepsy Surgery Outcome Scale

Introduction

The Engel Epilepsy Surgery Outcome Scale arose out of the 1992 Palm Desert Conference on Epilepsy Surgery and is widely used to classify outcome after surgical treatment for medically refractory outcome.

Basic Outcome Scale

  • Class I: Free of disabling seizures
  • Class II: Rare disabling seizures ("almost seizure-free")
  • Class III: Worthwhile improvement
  • Class IV: No worthwhile improvement

Annotated Outcome Scale

  • Class I - Free of disabling seizures (completely seizure free; non-disabling, simple partial seizures only; some disabling seizures, but free of disabling seizures for at least 2 years; generalized convulsion with antiepileptic drug withdrawal only.)
  • Class II - Rare disabling seizures (initially free of disabling seizures, but rare seizures now; rare disabling seizures since surgery; more than rare disabling seizures, but rare seizures for at least 2 years; nocturnal seizures only.)
  • Class III - Worthwhile improvement (worthwhile seizure reduction; prolonged seizure-free intervals amounting to more than half the follow-up period, but not less than 2 years.)
  • Class IV - No worthwhile improvement (significant seizure reduction; no appreciable change; seizures worse.)