Journal Article

Endovascular Electroencephalogram Records Simultaneous Subdural Electrode-Detectable, Scalp Electrode-Undetectable Interictal Epileptiform Discharges

Fujimoto, Ayataka, Masuda, Yosuke, Hosoo, Hisayuki, Marushima, Aiki, Ishikawa, Eiichi, Matsumaru, Yuji, Araki, Kota

2022

Overview

Introduction: We hypothesized that an endovascular electroencephalogram (eEEG) can detect subdural electrode (SDE)-detectable, scalp EEG-undetectable epileptiform discharges. The purpose of this study is, therefore, to measure SDE-detectable, scalp EEG-undetectable epileptiform discharges by an eEEG on a pig. Methods: A pig under general anesthesia was utilized to measure an artificially generated epileptic field by an eEEG that was able to be detected by an SDE, but not a scalp EEG as a primary outcome. We also compared the phase lag of each epileptiform discharge that was detected by the eEEG and SDE as a secondary outcome. Results: The eEEG electrode detected 113 (97%) epileptiform discharges (97% sensitivity). Epileptiform discharges that were localized within the three contacts (contacts two, three and four), but not spread to other parts, were detected by the eEEG with a 92% sensitivity. The latency between peaks of the eEEG and right SDE earliest epileptiform discharge ranged from 0 to 48 ms (mean, 13.3 ms; median, 11 ms; standard deviation, 9.0 ms). Conclusion: In a pig, an eEEG could detect epileptiform discharges that an SDE could detect, but that a scalp EEG could not.

• Publisher: MDPI AG,MDPI
• Subject: Anesthesia / Binding sites / Cardiovascular system / Communication / EEG / Electrodes / Electroencephalography / endovascular electroencephalogram / Epilepsy / Firing pattern / focal onset epilepsy / General anesthesia / interictal epileptiform discharge / Intubation / Laboratory animals / Latency / localized epileptogenicity / Magnetic resonance imaging / microcatheter / Sinuses / Titanium alloys