Visual and semiautomated evaluation of epileptogenicity in focal cortical dysplasias - An intracranial EEG study

Gollwitzer S, Valente I, Rodionov R, Scott C, Ritter LM, Wehner T, Hamer H, Bartolomei F, Diehl B (2016)

Publication Type: Journal article

Publication year: 2016

Journal

Epilepsy and Behavior Elsevier

Book Volume: 58

Pages Range: 69-75

DOI: 10.1016/j.yebeh.2016.03.009

Abstract

The aim of the study was the evaluation of the added value of depth to subdural electrodes in delineating epileptogenicity of focal cortical dysplasias (FCDs) and to test the Epileptogenicity Index (EI) in this setting.Fifteen patients with FCD underwent iEEG with subdural and depth electrodes. Visual/EI analysis was performed in up to three habitual seizures per patient.Visual analysis: Grid onset seizures (n=10) started in electrodes overlying the lesion in 7 and remote from it in 3 cases. Depth onset seizures (n=7) affected only intralesional contacts in 4, intra- and extralesional in 2, and exclusively extralesional in 1 patient. Seizures started in depth and grid contacts simultaneously in 2 cases. EI analysis: The EI completely confirmed visual localization of seizure onset in 8 cases and depicted ictal onset-time accurately in 13. Beta/gamma ictal patterns were most reliably captured. Impact on surgical decision: Resection outline differed from MRI lesion in 7 patients based on grid and in three based on depth electrode information.In FCD, seizures can be generated within gyral/deep tissue appearing normal on imaging.Investigating FCD with subdural and depth electrodes is efficient to outline the seizure onset zone. The EI is a helpful additional tool to quantify epileptogenicity. Specific ictal patterns are prerequisite for reliable results.

Authors with CRIS profile

Hajo Hamer Professur für Epileptologie

Involved external institutions

University College London Hospitals (UCLH) GB United Kingdom (GB) Hôpital de la Timone FR France (FR) King’s College London GB United Kingdom (GB)

How to cite

APA:

Gollwitzer, S., Valente, I., Rodionov, R., Scott, C., Ritter, L.M., Wehner, T.,... Diehl, B. (2016). Visual and semiautomated evaluation of epileptogenicity in focal cortical dysplasias - An intracranial EEG study. Epilepsy and Behavior, 58, 69-75. https://dx.doi.org/10.1016/j.yebeh.2016.03.009

MLA:

Gollwitzer, Stephanie, et al. "Visual and semiautomated evaluation of epileptogenicity in focal cortical dysplasias - An intracranial EEG study." Epilepsy and Behavior 58 (2016): 69-75.

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