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Nonhabitual seizures in patients with implanted subdural electrodes
Kostas N Fountas1, Donald W King, Patrick D Jenkins
1Department of Neurosurgery, Medical College of Georgia, Augusta, GA, USA. knfountasmd@excite.com
Stereotactic and Functional Neurosurgery
|November 6, 2004
Summary
Subdural electrodes for epilepsy monitoring can cause rare nonhabitual seizures. These seizures, different from usual ones, resolved after electrode removal, highlighting a potential complication in invasive epilepsy monitoring.
Area of Science:
- Neurology
- Neurosurgery
- Epileptology
Background:
- Subdural electrodes are standard for invasive epilepsy monitoring in medically refractory cases.
- Complications, though rare, can arise from subdural electrode implantation.
- Nonhabitual seizures represent a potential, albeit infrequent, complication.
Purpose of the Study:
- To report the occurrence of nonhabitual seizures during subdural electrode monitoring for epilepsy.
- To investigate the characteristics and resolution of these nonhabitual seizures.
- To highlight a potential diagnostic challenge in localizing the epileptogenic zone.
Main Methods:
- Retrospective analysis of 21 patients undergoing subdural grid/strip electrode implantation for epilepsy monitoring.
- Continuous video electroencephalography (EEG) monitoring was performed.
- Clinical and electrographic seizure patterns were analyzed, distinguishing habitual from nonhabitual seizures.
Main Results:
- Three out of 21 patients (14.3%) exhibited nonhabitual seizures during subdural monitoring.
- These seizures were clinically and electrographically distinct from the patients' habitual seizure patterns.
- Nonhabitual seizures ceased postoperatively following the removal of the implanted electrodes.
Conclusions:
- Nonhabitual seizures are a rare but documented complication of subdural electrode implantation for epilepsy monitoring.
- The occurrence of such seizures may stem from mechanical or chemical cortical irritation.
- Recognizing nonhabitual seizures is crucial to prevent mislocalization of the epileptogenic focus during epilepsy surgery evaluations.