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Predicting outcome following reoperation for medically intractable epilepsy.
M D Holmes1, A J Wilensky, L M Ojemann
1Department of Neurology, University of Washington School of Medicine, Seattle, WA, USA. mdholmes@u.washington.edu
Seizure
|May 1, 1999
Summary
Predictors for successful reoperation in epilepsy were identified. Central nervous system infection history negatively impacts outcomes, while concordant pre-operative EEG and MRI findings significantly improve seizure control after reoperation.
Area of Science:
- Neurology
- Neurosurgery
- Epileptology
Background:
- Medically intractable partial epilepsy often requires surgical intervention.
- Reoperation may be considered when initial epilepsy surgery fails to achieve seizure freedom.
- Predicting outcomes for epilepsy reoperation is crucial for patient selection and management.
Purpose of the Study:
- To identify predictors of successful outcomes following reoperation for medically intractable partial epilepsy.
- To analyze factors influencing seizure control after a second epilepsy surgery.
- To determine if specific pre-operative conditions or surgical approaches correlate with better results.
Main Methods:
- Retrospective review of 21 patients undergoing reoperation for failed epilepsy surgery.
- Analysis of patient history, neurological examination, pre-operative MRI, and EEG data (pre- and post-failed surgery).
- Evaluation of neuro-psychological deficits, surgical site, and pathology of resected tissue.
Main Results:
- A history of central nervous system (CNS) infection preceding epilepsy onset was associated with a lack of seizure-free outcome post-reoperation (P = 0.04).
- Reoperations with extended resections, guided by concordant ictal EEG, EEG onsets, and pre-first surgery MRI findings, achieved seizure freedom or >95% seizure reduction in 100% of cases (7/7).
- In contrast, patients without such concordance had a similar outcome in only 29% of cases (4/14) (P = 0.009).
Conclusions:
- Reoperation can lead to significant seizure improvement in a subset of patients with intractable partial epilepsy.
- Absence of prior CNS infection and concordance of pre-operative imaging and EEG data are strong predictors of favorable outcomes after epilepsy reoperation.
- Identifying these predictors can help select patients most likely to benefit from repeat epilepsy surgery.