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High frequency thalamic stimulation for inoperable mesial temporal epilepsy.

Ivan Osorio1, John Overman, Jonathon Giftakis

  • 1The University of Kansas Medical Center, Department of Neurology, Comprehensive Epilepsy Center, 3901 Rainbow Boulevard, Kansas City, KS 66160, USA. iosorio@kumc.edu

Epilepsia
|March 28, 2007
PubMed
Summary

High-frequency thalamic stimulation significantly reduced seizures in patients with inoperable mesial temporal epilepsy. This epilepsy treatment was safe, well-tolerated, and improved quality of life.

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Area of Science:

  • Neurology
  • Neurosurgery
  • Epilepsy Research

Background:

  • Mesial temporal epilepsy is a debilitating neurological condition.
  • Inoperable cases present significant treatment challenges.
  • Thalamic stimulation is an emerging neuromodulation technique.

Purpose of the Study:

  • To evaluate the safety, tolerability, and efficacy of high-frequency periodic thalamic stimulation for inoperable mesial temporal epilepsy.
  • To assess the utility of intracranial evoked responses for verifying lead placement accuracy.

Main Methods:

  • Four patients with inoperable mesial temporal epilepsy received thalamic lead implants.
  • Stimulation parameters (175 Hz, 4.1 V, 90 μs, 1 min ON/5 min OFF) were applied.
  • Seizure frequency reduction was compared between a 6-month baseline and a 36-month treatment period.

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  • Intracranial evoked responses were recorded to assess lead placement uniformity.

    • Main Results:

    • All participants tolerated the stimulation well, with no serious adverse effects.
    • A mean seizure frequency reduction of 75.6% was observed (p < 0.01).
    • Quality of life improved across all subjects.
    • Evoked responses indicated heterogeneity in lead placement, suggesting a lack of anatomical uniformity.

    Conclusions:

    • High-frequency, continuous thalamic stimulation is a safe and effective treatment for inoperable mesial temporal epilepsy.
    • Closed-loop trials may aid in identifying optimal stimulation parameters.
    • Selective targeting of a single nucleus may not be necessary for therapeutic benefit.
    • Evoked responses can help verify the uniformity of target acquisition during lead placement.