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Jerk-locked back averaging and dipole source localization of magnetoencephalographic transients in a patient with epilepsia partialis continua

Authors
Journal
Electroencephalography and Clinical Neurophysiology
0013-4694
Publisher
Elsevier
Publication Date
Volume
103
Issue
4
Identifiers
DOI: 10.1016/s0013-4694(97)00040-0
Keywords
  • Magnetoencephalography
  • Jerk-Locked Back Averaging
  • Epilepsia Partialis Continua
  • Dipole Estimation

Abstract

Abstract In order to localize the generator site of epileptiform discharges, we applied the techniques of jerk-locked back averaging (JBA) of magnetoencephalographic (MEG) activities and dipole source localization in a patient with epilepsia partialis continua (EPC), who showed continuous, focal myoclonic jerks in the right arm. The myoclonic discharges in the right muscle were used as a trigger pulse. JBA revealed consistent EEG and MEG transients that coincided consistently and constantly preceded the myoclonic jerks. The estimated dipoles of MEG were localized in a restricted area in the left precentral area, which closely correlated with the area of epileptic discharges recorded in electrocorticography. Therefore, JBA of MEG is considered to be a useful non-invasive method for localizing the epileptogenic area in EPC.

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