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[Intractable epilepsy--neurophysiological evaluation and indication for surgical treatment]
1Department of Brain Pathophysiology, Kyoto University School of Medicine.
Rinsho Shinkeigaku = Clinical Neurology
|December 1, 1994
Summary
Identifying the seizure focus in medically intractable epilepsy is crucial for surgical success. Advanced imaging like PET and SPECT, combined with MRI, accurately pinpoint the epileptogenic zone noninvasively.
Area of Science:
- Neurology
- Neurosurgery
- Medical Imaging
Context:
- Medically intractable epilepsy affects many patients despite drug treatments.
- Precise localization of the epileptogenic focus is essential for successful epilepsy surgery.
- Non-invasive techniques are increasingly used to avoid invasive EEG recordings.
Purpose:
- To evaluate the accuracy of non-invasive imaging techniques in localizing the epileptogenic focus in patients with intractable partial seizures.
- To correlate findings from prolonged video/EEG monitoring, MRI, SPECT, and PET with ictal EEG data.
- To determine the concordance of these methods in identifying a single ictal focus.
Summary:
- 37 patients with intractable partial seizures underwent video/EEG monitoring, MRI, ictal/interictal SPECT, and interictal FDG-PET.
- In patients with a single ictal focus (n=20), PET showed 100% concordance with EEG, ictal SPECT 86%, and MRI 75%.
- Convergent findings from these non-invasive methods suggest high likelihood of surgical success without invasive evaluation.
Impact:
- Accurate non-invasive localization of the seizure focus can guide surgical treatment decisions.
- High concordance among imaging modalities increases confidence in surgical planning.
- Divergent findings may indicate the need for invasive electrophysiological studies to confirm the epileptogenic zone.