Single Stage Epilepsy Surgery in Children and Adolescents with Focal Cortical Dysplasia Type II – Prognostic Value of the Intraoperative Electrocorticogram

Publication date: Available online 14 November 2018

Source: Clinical Neurophysiology

Author(s): Gudrun Gröppel, Christian Dorfer, Sharon Samueli, Anastasia Dressler, Angelika Mühlebner, Daniela Prayer, Thomas Czech, Martha Feucht

Abstract

Objective

To evaluate prospectively the informative/prognostic value of epileptic discharges in the post-resection ECoGs of children with drug-resistant epilepsies and Focal Cortical Dysplasia type II (FCD-II).

Methods

Included were consecutive patients with focal epilepsies and suspected FCD-II who were planned for single-stage epilepsy surgery based on non-invasive presurgical evaluation results. Intraoperative ECoGs were recorded using a 32-channel system with strip- and/or grid-electrodes. Spikes were defined as transients with a mainly negative component and duration of 20-70ms. Fast activity was defined as rhythmic bursts of polyspikes > 13Hz. All ECoGs were analysed visually. The significance of both spikes and fast activity in the post-resection ECoG for seizure outcomes 24 months after surgery was evaluated.

Results

Data from 18 patients (five girls) were analysed. 10/18 patients (55.6%) showed spikes in their post-resection ECoGs, five of them showed additional fast activity. 24 months after surgery, 12/18 patients (66.7%) were seizure-free. There was a significant correlation between unfavorable seizure outcomes and fast activity in the post-resection ECoGs (p=0.009), whereas spikes alone were not predictive (p=0.502).

Conclusion

Even when recorded with non-sophisticated techniques, presence of fast activity in post-resection ECoGs might be a valid negative outcome-predictor after surgery in paediatric patients with FCD-II associated drug-resistant epilepsies.

Significance

Fast activity recorded with a relatively simple ECoG equipment seems also to have prognostic significance and by this might be an alternative to HFOs recorded with highly sophisticated and expensive technologies.

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