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Roth J; Olasunkanmi A; Ma TS; Carlson C; Devinsky O; Harter DH; Weiner HL
"Epilepsy control following intracranial monitoring without resection in young children"
Epilepsia 2012 Feb; 53(2):334-341
Purpose: Intracranial monitoring (IM) is a key diagnostic procedure for select patients with treatment-resistant epilepsy (TRE). Seizure focus resection may improve seizure control in both lesional and nonlesional TRE. IM itself is not considered to have therapeutic potential. We describe a cohort of patients with improved seizure control following IM without resective surgery. Methods: Over 12.5 years, 161 children underwent 496 surgeries including intracranial monitoring. We retrospectively reviewed the patients' charts, operative reports, and radiologic scans, under an institutional review board-approved protocol. Key Findings: Seventeen patients underwent only IM, without additional resective surgery, and seven had a dramatic improvement in their epilepsy; six of the seven patients are seizure-free (Engel class I), and one rarely has seizures (Engel class II). All seven patients had frequent seizures that led to IM: either daily (five patients) or 1-2 per week (two patients). The mean age (+/- standard deviation, SD) at seizure onset was 1.6 +/- 1.3 years (range 0.5-4 years). Etiologies were tuberous sclerosis (3 patients), trauma (1 patient), and unknown (3 patients). Mean age at surgery (+/- SD) was 4.1 +/- 2 years (range 1-7 years), and duration of epilepsy 2.5 +/- 1.1 years (range 0.5-4 years). Duration of IM was 11.7 +/- 5.6 days (5-19 days). Six patients had bilateral and one unilateral invasive electrodes. At last follow-up, four patients required fewer antiepileptic drugs (AEDs), one had the same medication but a higher dose, and two patients were taking additional AEDs. Follow-up was 30.6 +/- 9.5 months (range 19-41 months). Significance: Although uncommon, patients with TRE may improve after IM alone. The explanation for this observation remains unclear; however, perioperative medications including steroids, direct cortical manipulation, or other factors may influence the epileptogenic network

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