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The magnetic field of complex partial seizures agrees with intracranial localizations.

Authors
  • Sutherling, W W
  • Crandall, P H
  • Engel, J Jr
  • Darcey, T M
  • Cahan, L D
  • Barth, D S
Type
Published Article
Journal
Annals of neurology
Publication Date
Jun 01, 1987
Volume
21
Issue
6
Pages
548–558
Identifiers
PMID: 3606043
Source
Medline
License
Unknown

Abstract

The magnetoencephalogram (MEG) was recorded during 63 complex partial seizures in 4 patients. The MEG showed large biomagnetic signals occurring at the same time as discharges recorded from scalp electroencephalogram (EEG). These MEG signals had the same morphology and frequency as the discharges from the EEG. The location of the seizure focus was verified by depth electrode recordings in 2 patients and by lesions shown on computed tomographic scan and magnetic resonance imaging in the other 2. In each patient, MEG localization estimates were consistent with the location of the seizure focus shown by other methods. When seizures were recorded repeatedly and mapped with a single-channel magnetometer placed at different scalp locations in a single patient, the MEG localization agreed with the electrographic seizure focus localized from depth electrodes. In the maps, the MEG resolved an ambiguity in the scalp EEG and therefore increased the confidence of localization. MEG recordings of seizures may help localize epileptic foci noninvasively.

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