Brain, Vol. 119, No. 3, 989-996, 1996
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The running down phenomenon in temporal lobe epilepsy
Department of Neurology and Neurosurgery, McGill University and the Montreal Neurological Institute and Hospital 3801 University Street, Montreal, PQ, Canada H3A 2B4 *Present address: Department of Neurology, Indiana University Medical Center, Riley Hospital Indianapolis, USA
Correspondence to:
Correspondence to: Dr Salanova, Department of Neurology, Indiana University Medical Center, Riley Hospital, Room 5999C, 702 Barnhill Drive, Indianapolis, IN 46202–5200, USA
We compared 100 patients with temporal lobe epilepsy, who exhibited the running down phenomenon following temporal resections, with two groups of patients: 100 patients who became seizure-free, and 100 patients who continued to have frequent seizures following temporal resection. We found a significant correlation between prognosis and the size of the epileptogenic area as defined; patients with smaller epileptogenic areas had the best prognosis (seizure-free group). Patients exhibiting the running down phenomenon had intermediate size epileptogenic areas, while those patients who continued to have seizures had the largest epileptogenic areas often involving the lateral temporal and posterior temporal cortex. Other factors predictive of good outcome were: a history of febrile seizures, predominantly unilateral interictal spiking. anterior temporal localization, extent of resection of the mesial temporal structures, surgery under the age of 30 years, and the absence of habitual seizures in the immediate postoperative period. Patients with history of head trauma, encephalitis, posterior temporal localization and bitemporal spiking had a worse outcome. The frequency and types of aurae, and laterality of resection did not correlate with outcome.
epilepsy; surgery; outcome
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Received June 1, 1995. Revised December 18, 1995. Accepted February 13, 1996.
*Present address: Department of Neurology, Indiana University Medical Center, Riley Hospital, Indianapolis, USA
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