MEG correlates of epileptic high gamma oscillations in invasive EEG.

Abstract:

:In patients with pharmacoresistant focal epilepsy,we demonstrate that magnetoencephalography (MEG) detects spike-locked and spike-independent epileptic high gamma oscillations (HGOs) using combined MEG and invasive electroencephalography (iEEG) from subdural macroelectrodes. Six patients, who underwent presurgical workup for epilepsy surgery with preoperative simultaneous MEG and subdural iEEG recordings,were investigated. HGOs in iEEG were detected automatically and served as triggers for averaging and localization of simultaneous MEG data. iEEG-HGOs were detected in all patients and MEG-HGOs in five patients. HGOs were highly associated with epileptic networks and correctly identified seizure-onset zones in five (MEG) and six patients (iEEG). Minimum-norm source analysis of MEG data yielded concordant localizations. Noninvasive analysis of HGOs may allow investigation of epileptic networks independent of spikes and seizures. Determination of sensitivity and specificity, as well as development of MEG-HGO analysis without the need of iEEG should be addressed in a larger study.

journal_name

Epilepsia

journal_title

Epilepsia

authors

Rampp S,Kaltenhäuser M,Weigel D,Buchfelder M,Ingmar Blümcke I,Dörfler A,Stefan H

doi

10.1111/j.1528-1167.2010.02579.x

subject

Has Abstract

pub_date

2010-08-01 00:00:00

pages

1638-42

issue

8

eissn

0013-9580

issn

1528-1167

pii

EPI2579

journal_volume

51

pub_type

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