Long-term seizure outcome of surgery versus no surgery for drug-resistant partial epilepsy: A review of controlled studies
Article first published online: 23 FEB 2009
Wiley Periodicals, Inc. © 2009 International League Against Epilepsy
Volume 50, Issue 6, pages 1301–1309, June 2009
How to Cite
Schmidt, D. and Stavem, K. (2009), Long-term seizure outcome of surgery versus no surgery for drug-resistant partial epilepsy: A review of controlled studies. Epilepsia, 50: 1301–1309. doi: 10.1111/j.1528-1167.2008.01997.x
- Issue published online: 10 JUN 2009
- Article first published online: 23 FEB 2009
- Accepted October 29, 2008; Early View publication February 23, 2009.
- Epilepsy surgery;
- Long-term outcome;
- Chronic epilepsy;
- Antiepileptic drugs;
- Seizure prognosis
A majority of patients with formerly drug-resistant temporal lobe epilepsy become seizure-free after surgery. However, apart from one 12-month randomized trial, it is unclear how many become seizure-free because of surgery. To determine the net benefit of surgery, we performed a systematic review and meta-analysis of the published evidence of how many patients in similar studies become seizure-free without surgery. Of 155 potentially eligible articles reviewed in full text, 29 (19%) fulfilled eligibility criteria. After excluding 9 publications, 20 studies form the base of evidence. Overall, 719 of 1,621 (44%) of patients with mostly temporal lobe surgery were seizure-free compared to 139 of 1113 (12%) of nonoperated controls [pooled random effects relative risk (RR) 4.26, 95% confidence interval (CI) 3.03–5.98]. The pooled risk difference in favor of surgery was 42% (95% CI 32–51%). We found no comparative outcome data in patients with extratemporal lobe epilepsy only. The available evidence from mostly nonrandomized observational studies indicates that in appropriately selected patients with drug-resistant temporal lobe epilepsy, the combination of surgery with medical treatment is 4 times as likely as medical treatment alone to achieve freedom from seizures.