Comparison of magnetoencephalographic spikes with and without concurrent electroencephalographic spikes in extratemporal epilepsy

The Tohoku Journal of Experimental Medicine
Hyeon-Mi ParkTakashi Yoshimoto

Abstract

Interictal spikes in patients with epilepsy may be detected by either electroencephalography (EEG) (E-spikes) or magnetoencephalography (MEG) (M-spikes), or both MEG and EEG (E/M-spikes). Localization and amplitude were compared between E/M-spikes and M-spikes in 7 adult patients with extratemporal epilepsy to evaluate the clinical significance of MEG spikes. MEG and EEG were simultaneously measured using a helmet-shaped MEG system with planar-type gradiometers and scalp electrodes of the international 10-20 system. Sources of E/M-spikes and M-spikes were estimated by an equivalent current dipole (ECD) model for MEG at peak latency. Each subject showed 9 to 20 (mean 13.4) E/M-spikes and 9 to 31 (mean 16.3) M-spikes. No subjects showed significant differences in the ECD locations between E/M- and M-spikes. ECD moments of the E/M-spikes were significantly larger in 2 patients and not significantly different in the other 5 patients. The similar localizations of E/M-spikes and M-spikes suggest that combination of MEG and EEG is useful to detect more interictal spikes in patients with extratemporal epilepsy. The smaller tendency of ECD amplitude of the M-spikes than E/M-spikes suggests that scalp EEG may overlook small tangential sp...Continue Reading

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Citations

Nov 11, 2008·Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society·Marta SantiusteGalleon Graetz
Sep 16, 2009·Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society·Albert J ColonPaul Boon
Aug 3, 2012·Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society·Jens HaueisenRoland Eichardt
Mar 4, 2011·Epilepsia·Kost ElisevichSusan M Bowyer
Sep 22, 2011·Epilepsia·Hermann StefanDaniel Weigel
Feb 23, 2012·The Tohoku Journal of Experimental Medicine·Hyeon-Mi ParkTeiji Tominaga
May 15, 2012·Seizure : the Journal of the British Epilepsy Association·Xin-Tong WuHermann Stefan
Jun 19, 2007·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Stefan Rampp, Hermann Stefan
Jun 27, 2006·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Kamran Ali SalayevKazuie Iinuma
Jun 20, 2015·Epilepsy Research·Yuki UedaHideaki Shiraishi
Jul 6, 2010·Seizure : the Journal of the British Epilepsy Association·M HeersH Stefan
Apr 12, 2014·Frontiers in Human Neuroscience·Alexander HunoldChristos Papadelis
Aug 31, 2016·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Lene DuezAnders Fuglsang-Frederiksen
Sep 29, 2009·Clinical EEG and Neuroscience·M FunkeE Rodin
Sep 21, 2018·Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society·John S Ebersole, Michael Wagner
Jun 16, 2021·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Dai AgariNobukazu Nakasato

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