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The running down phenomenon in temporal lobe epilepsy

V Salanova1, F Andermann, T Rasmussen

  • 1Department of Neurology, McGill University, Montreal, PQ Canada.

Brain : a Journal of Neurology
|June 1, 1996
PubMed
Summary

The size of the epileptogenic area in temporal lobe epilepsy (TLE) significantly predicts surgical outcomes. Smaller areas correlate with seizure freedom, while larger areas predict persistent seizures post-resection.

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Area of Science:

  • Neurology
  • Epileptology
  • Neurosurgery

Background:

  • Temporal lobe epilepsy (TLE) is a common form of focal epilepsy.
  • Surgical resection is a treatment option for refractory TLE.
  • Predicting surgical outcomes remains a challenge.

Purpose of the Study:

  • To identify factors predicting seizure outcomes after temporal resections in TLE patients.
  • To correlate the size of the epileptogenic zone with surgical prognosis.
  • To evaluate the 'running down phenomenon' as an outcome predictor.

Main Methods:

  • Comparison of 300 TLE patients undergoing temporal resection.
  • Categorization into seizure-free, 'running down phenomenon', and persistent seizure groups.
  • Analysis of pre-operative and post-operative clinical and EEG data.

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Main Results:

  • A significant correlation exists between epileptogenic area size and prognosis.
  • Smaller epileptogenic areas predicted seizure freedom.
  • Larger areas, especially involving lateral/posterior temporal cortex, predicted persistent seizures.
  • Predictors of good outcome included: febrile seizures history, unilateral spiking, anterior localization, mesial resection extent, surgery <30 yrs, no immediate post-op seizures.
  • Predictors of poor outcome included: head trauma, encephalitis, posterior localization, bitemporal spiking.

Conclusions:

  • Epileptogenic area size is a key determinant of surgical success in TLE.
  • The 'running down phenomenon' indicates an intermediate prognosis.
  • Multiple clinical and EEG factors influence TLE surgery outcomes, aiding in patient selection and counseling.