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Ictal source localization in presurgical patients with refractory epilepsy
Paul Boon1, Michel D'Havé, Bart Vanrumste
1Department of Neurology, Ghent University Hospital, Ghent University, Belgium. Paul.Boon@rug.ac.be
Summary
Ictal spatiotemporal dipole modeling (ISDM) provides valuable anatomical insights for epilepsy surgery. While not always feasible, ISDM significantly influences surgical decisions in a notable percentage of patients, optimizing presurgical evaluations.
Area of Science:
- Neuroscience
- Medical Imaging
- Epileptology
Background:
- Ictal spatiotemporal dipole modeling (ISDM) offers reliable anatomical information for presurgical epilepsy evaluation.
- The clinical utility and patient selection for ISDM remain incompletely understood.
- Epilepsy surgery requires precise localization of the seizure focus.
Purpose of the Study:
- To prospectively evaluate the clinical usefulness of source localization using ISDM in presurgical epilepsy candidates.
- To determine the impact of ISDM on surgical decision-making.
- To identify patient subgroups who benefit most from ISDM.
Main Methods:
- Consecutive enrollment of 100 refractory epilepsy patients into a presurgical protocol.
- Performance of ISDM when suitable ictal EEG and MRI data were available.
- Analysis of ISDM applicability and influence on surgical decisions across three patient groups based on EEG-MRI congruence.
Main Results:
- ISDM was successfully performed in 31% of the 100 presurgical candidates.
- ISDM influenced surgical decision-making in 4 out of 8 patients with partially congruent results and 10 out of 12 with incongruent results.
- In 14% of patients, ISDM was a key factor in the surgical decision, often guiding against invasive intracranial EEG monitoring.
Conclusions:
- ISDM is a valuable tool in presurgical epilepsy evaluation, particularly when EEG and MRI findings are incongruent.
- ISDM can refine surgical candidacy and potentially avoid unnecessary invasive procedures.
- Further research should explore optimizing ISDM performance and patient selection for improved outcomes.