Document Detail

Ictal MEG onset source localization compared to intracranial EEG and outcome: improved epilepsy presurgical evaluation in pediatrics.
MedLine Citation:
PMID:  22178034     Owner:  NLM     Status:  MEDLINE    
PURPOSE: Magnetoencephalography (MEG) has been shown a useful diagnostic tool for presurgical evaluation of pediatric medically intractable partial epilepsy as MEG source localization has been shown to improve the likelihood of seizure onset zone (SOZ) sampling during subsequent evaluation with intracranial EEG (ICEEG). We investigated whether ictal MEG onset source localization further improves results of interictal MEG in defining the SOZ.
METHODS: We identified 20 pediatric patients with one habitual seizure during MEG recordings between October 2007 and April 2011. MEG was recorded with sampling rates of 600Hz and 4000Hz for 10 and 2min respectively. Continuous head localization (CHL) was applied. Source localization analyses were applied using multiple algorithms, both at the beginning of ictal onset and for interictal MEG discharges. Ictal MEG onsets were identified by visual inspection and power spectrum using short-time Fourier transform (STFT). Source localizations were compared with ICEEG, surgical procedure and outcome.
KEY FINDINGS: Eight patients met all inclusion criteria. Five of the 8 patients (63%) had concordant ictal MEG onset source localization and interictal MEG discharge source localizations in the same lobe, but the source of ictal MEG onset was closer to the SOZ defined by ICEEG.
SIGNIFICANCE: Although the capture of seizures during MEG recording is challenging, the source localization for ictal MEG onset proved to be a useful tool for presurgical evaluation in our pediatric population with medically intractable epilepsy.
Hisako Fujiwara; Hansel M Greiner; Nat Hemasilpin; Ki Hyeong Lee; Katherine Holland-Bouley; Todd Arthur; Diego Morita; Sejal V Jain; Francesco T Mangano; Ton Degrauw; Douglas F Rose
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, N.I.H., Extramural     Date:  2011-12-16
Journal Detail:
Title:  Epilepsy research     Volume:  99     ISSN:  1872-6844     ISO Abbreviation:  Epilepsy Res.     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-05-01     Completed Date:  2013-01-31     Revised Date:  2013-06-26    
Medline Journal Info:
Nlm Unique ID:  8703089     Medline TA:  Epilepsy Res     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  214-24     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 Elsevier B.V. All rights reserved.
Division of Neurology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA.
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MeSH Terms
Electroencephalography / methods*,  standards
Epilepsy / diagnosis*,  physiopathology*,  surgery
Follow-Up Studies
Magnetoencephalography / methods*,  standards
Preoperative Care / methods*,  standards
Retrospective Studies
Grant Support

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