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Stereotactic amygdalohippocampotomy and mesial temporal spikes
W T Blume1, A G Parrent, M Kaibara
1University Hospital, The University of Western Ontario, London, Canada.
Epilepsia
|August 1, 1997
Summary
Radiofrequency lesions in the amygdala and hippocampus did not alter mesial temporal spike rates in epilepsy patients. However, these lesions effectively reduced complex partial seizures in most patients, suggesting a dichotomy in epilepsy mechanisms.
Area of Science:
- Neurology
- Neurosurgery
- Epileptology
Background:
- Mesial temporal lobe epilepsy (MTLE) is often intractable.
- Understanding the mechanisms of interictal spike generation is crucial for effective treatment.
- Amygdalohippocampotomy is a surgical option for refractory MTLE.
Purpose of the Study:
- To investigate the mechanism of mesial temporal spike generation.
- To determine if radiofrequency amygdalohippocampotomy alters spike rates in patients with medically intractable temporal lobe epilepsy.
Main Methods:
- 14 patients with MRI-demonstrated unilateral mesial temporal sclerosis underwent stereotactic placement of electrodes.
- Radiofrequency lesions were created in the amygdala and hippocampus.
- Scalp and invasive electroencephalogram (EEG) recordings were performed before, during, and after lesioning.
Main Results:
- No consistent change in anterior and total mesial temporal spike rates was observed after lesioning.
- Spike rate changes did not correlate with seizure control effectiveness.
- Complex partial seizures (CPS) improved in 13 out of 14 patients.
Conclusions:
- Destructive amygdala and hippocampal lesions do not consistently affect mesial temporal spike quantity.
- Amygdalohippocampotomy significantly reduced complex partial seizures in most patients.
- This suggests distinct mechanisms for interictal spikes (possibly entorhinal cortex alone) and complex partial seizures (involving hippocampus, entorhinal cortex, and amygdala).