Minim Invasive Neurosurg 2007; 50(1): 37-42
DOI: 10.1055/s-2007-950384
Original Article

© Georg Thieme Verlag KG Stuttgart · New York

Display of the Epileptogenic Zone on the Frontal Cortical Surface Using Dynamic Voltage Topography of Ictal Electrocorticographic Discharges

F. Yoshida 1 , T. Morioka 1 , K. Hashiguchi 1 , Y. Miyagi 1 , S. Nagata 1 , M. Ohshio 2 , T. Sasaki 1
  • 1Department of Neurosurgery, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
  • 2Department of Clinical Chemistry and Laboratory Medicine, Kyushu University Hospital, Fukuoka, Japan
Further Information

Publication History

Publication Date:
04 June 2007 (online)

Abstract

To evaluate the usefulness of computerized brain-surface dynamic voltage topography (DVT) of ictal electrocorticographic (ECoG) discharges to localize and identify epileptogenic areas, 3 patients with intractable frontal lobe epilepsy who underwent epilepsy surgery after chronic subdural electrode recording were assessed. Cortical surfaces and subdural electrodes were photographed during initial surgery to create an electrode map that could be superimposed onto a picture of the brain surface. DVT was performed by calculating sequential amplitudes of ictal ECoG discharges, which were then superimposed onto the cortical and electrode maps. In all cases, DVT clearly identified the ictal onset zone and the early propagation area on the operative field. DVT allowed recognition of spatial relationships between the epileptogenic area and structural abnormalities, functional cortex, and cortical veins; and was useful to decide on the resection area.

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Correspondence

T. MoriokaMD, PhD 

Department of Neurosurgery

Graduate School of Medical Sciences

Kyushu University

Fukuoka 812-8582

Japan

Phone: +81/92/642 55 24

Fax: +81/92/642 55 26

Email: takato@ns.med.kyushu-u.ac.jp