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Is epilepsy surgery on both hemispheres effective?

Arun Angelo Patil1, Richard V Andrews, Matthew Johnson

  • 1Ra Neurology, Omaha, Nebr., USA. apatil@unmc.edu

Stereotactic and Functional Neurosurgery
|December 18, 2004
PubMed
Summary

Minimally invasive epilepsy surgery using multiple subpial transection (MST) offers satisfactory seizure control for patients with bilateral independent seizure foci. This approach is safe and comparable to unilateral hemisphere surgery, providing a viable option for those unsuitable for conventional resective surgery.

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Area of Science:

  • Neurosurgery
  • Epileptology
  • Minimally Invasive Procedures

Background:

  • Patients with bilateral independent seizure foci are often ineligible for traditional resective epilepsy surgery.
  • Minimally invasive surgical techniques have been developed to address this patient population.
  • This study evaluates the effectiveness of such an approach in a large patient series.

Purpose of the Study:

  • To determine the effectiveness of minimally invasive surgical procedures for treating epilepsy patients with bilateral independent seizure foci.
  • To assess the safety and seizure control outcomes of this approach.

Main Methods:

  • A series of 61 patients underwent minimally invasive surgery with a mean follow-up of 41.5 months.
  • The primary procedure was multiple subpial transection (MST), sometimes supplemented with minimal cortical resection or stereotactic amygdala-hippocampotomy.

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  • Preoperative evaluations included comprehensive EEG monitoring, neuroimaging, and neuropsychological assessments.

    • Main Results:

    • 52.45% of patients achieved Engel class I seizure outcome, indicating significant seizure reduction.
    • No statistical difference in outcomes was observed between the first and second halves of the series, or compared to unilateral MST series.
    • No permanent neurological complications were reported, highlighting the safety of the procedure.

    Conclusions:

    • Minimally invasive surgery, including MST, is a safe and effective treatment for intractable epilepsy with bilateral independent foci.
    • Seizure control achieved is comparable to that of unilateral hemisphere surgery.
    • This approach provides a viable surgical option for patients previously considered poor candidates.