Usefulness of Intraoperative Electrocorticography for the Localization of Epileptogenic Zones

Abstract

Intraoperative electrocorticography (iECoG) is widely performed to identify irritative zones in the cortex during brain surgery; however, several limitations (e.g., short recording times and the effects of general anesthesia) reduce its effectiveness. The present study aimed to evaluate the utility of iECoG for localizing epileptogenic zones. We compared the results of iECoG and chronic electrocorticography (cECoG) in 25 patients with refractory epilepsy. Subdural electrodes were implanted with iECoG under general anesthesia (2% sevoflurane). cECoG recordings were performed for 3-14 days. The distribution of iECoG spikes was compared with cECoG spike, seizure onset zone, and resection areas. The concordance patterns of each distribution were classified into four patterns: Group 1:

Electrocorticogram (ECoG): Engineering Approaches and Clinical Challenges for Translational Medicine

“…Pacia et al, 2022 [ 76] Inoue et al, 2021 [ 77] Sommer et al, 2018 [ 78] Chiba et al, 2022 [ 79] Kim et al, 2016 [ 80] Type…”