MEG Node Degree for Focus Localization: Comparison with Invasive EEG

Author:

Rampp Stefan12ORCID,Kaltenhäuser Martin1,Müller-Voggel Nadia1,Doerfler Arnd3,Kasper Burkhard S.4,Hamer Hajo M.4,Brandner Sebastian1,Buchfelder Michael1

Affiliation:

1. Department of Neurosurgery, University Hospital Erlangen, 91054 Erlangen, Germany

2. Department of Neurosurgery, University Hospital Halle (Saale), 06120 Halle (Saale), Germany

3. Department of Neuroradiology, University Hospital Erlangen, 91054 Erlangen, Germany

4. Epilepsy Center, Department of Neurology, University Hospital Erlangen, 91054 Erlangen, Germany

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.

Funder

Deutsche Forschungsgemeinschaft and Friedrich-Alexander-Universität Erlangen-Nürnberg

Publisher

MDPI AG

Subject

General Biochemistry, Genetics and Molecular Biology,Medicine (miscellaneous)

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