Long-term amygdalohippocampal stimulation for refractory temporal lobe epilepsy

Area of Science:

• Neurology
• Neurosurgery

Background:

• Refractory temporal lobe epilepsy (TLE) poses significant treatment challenges.
• Short-term deep brain stimulation (DBS) has shown promise for TLE management.

Purpose of the Study:

• To evaluate the long-term efficacy and safety of DBS in medial temporal lobe structures for TLE.
• To assess the utility of chronic DBS electrodes for ictal onset zone localization prior to stimulation.

Main Methods:

• Implantation of DBS electrodes in the amygdalohippocampal region of three patients with complex partial seizures (CPSs).
• Recording electroencephalograms (EEGs) via DBS electrodes for ictal onset zone identification.
• Performing unilateral amygdalohippocampal stimulation and comparing CPS frequency before and after treatment.
• Monitoring for side effects throughout the study.

Main Results:

• High-quality EEG recordings accurately localized unilateral seizure onset in medial temporal lobe structures.
• All patients experienced a >50% reduction in seizure frequency after a mean 5-month follow-up.
• Two patients were able to reduce their antiepileptic drug dosage.
• No adverse side effects were reported by any patient.

Conclusions:

• Chronic DBS using implanted electrodes is a feasible method for ictal onset zone localization and treatment in TLE.
• Long-term DBS of medial temporal lobe structures demonstrates efficacy and safety in refractory TLE.
• Further research with larger cohorts is warranted to confirm DBS as an alternative TLE treatment.