MEG Node Degree for Focus Localization: Comparison with Invasive EEG

Language
en
Document Type
Article
Issue Date
2023-03-08
First published
2023-02-02
Issue Year
2023
Authors
Rampp, Stefan
Kaltenhäuser, Martin
Müller-Voggel, Nadia
Doerfler, Arnd
Kasper, Burkhard S.
Hamer, Hajo M.
Brandner, Sebastian
Buchfelder, Michael
Editor
Publisher
MDPI
Abstract

Epilepsy surgery is a viable therapy option for patients with pharmacoresistant focal epilepsies. A prerequisite for postoperative seizure freedom is the localization of the epileptogenic zone, e.g., using electro- and magnetoencephalography (EEG/MEG). Evidence shows that resting state MEG contains subtle alterations, which may add information to the workup of epilepsy surgery. Here, we investigate node degree (ND), a graph-theoretical parameter of functional connectivity, in relation to the seizure onset zone (SOZ) determined by invasive EEG (iEEG) in a consecutive series of 50 adult patients. Resting state data were subjected to whole brain, all-to-all connectivity analysis using the imaginary part of coherence. Graphs were described using parcellated ND. SOZ localization was investigated on a lobar and sublobar level. On a lobar level, all frequency bands except alpha showed significantly higher maximal ND (mND) values inside the SOZ compared to outside (ratios 1.11–1.20, alpha 1.02). Area-under-the-curve (AUC) was 0.67–0.78 for all expected alpha (0.44, ns). On a sublobar level, mND inside the SOZ was higher for all frequency bands (1.13–1.38, AUC 0.58–0.78) except gamma (1.02). MEG ND is significantly related to SOZ in delta, theta and beta bands. ND may provide new localization tools for presurgical evaluation of epilepsy surgery.

Journal Title
Biomedicines
Volume
11
Issue
2
Citation
Biomedicines 11.2 (2023): 438. <https://www.mdpi.com/2227-9059/11/2/438>
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