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Continuous potential display of ictal electrocorticography
Lan S Chen1, Hiroshi Otsubo, Ayako Ochi
1Division of Neurology, Childrens Hospital Los Angeles, Keck School of Medicine, University of Southern California, 90027, U.S.A.
Summary
Animation of electrocorticograms (ECoGs) using Continuous Potential Display (CPD) visualizes seizure spread from the epileptogenic zone (EZ). This method aids in precisely mapping the EZ for epilepsy surgery, improving resection accuracy.
Area of Science:
- Neuroscience
- Epileptology
- Medical Imaging
Background:
- Epilepsy surgery requires precise identification of the epileptogenic zone (EZ).
- Standard electrocorticograms (ECoGs) can make seizure propagation patterns difficult to discern.
- Visualizing electrical activity dynamics is crucial for understanding seizure spread.
Purpose of the Study:
- To evaluate if animating ictal electrocorticograms (ECoGs) can demonstrate seizure propagation.
- To assess the utility of Continuous Potential Display (CPD) in mapping the EZ.
- To determine the accuracy of CPD-based EZ mapping for surgical planning.
Main Methods:
- Developed a computer program (CPD) to animate color-coded potential changes in 5-msec intervals.
- Analyzed 35 ictal ECoGs from 11 epilepsy surgery patients using subdural grid electrodes.
- Compared CPD-identified EZ with the surgical resection area.
Main Results:
- CPD animation revealed recurrent seizure propagation cycles from the EZ to surrounding areas.
- The EZ could be mapped dynamically throughout the seizure course.
- CPD mapping showed 69% overlap with the surgical area, with 34% false positives and 35% false negatives.
Conclusions:
- Animating ictal ECoG with CPD effectively visualizes seizure propagation patterns.
- CPD assists in temporal and spatial mapping of the EZ for surgical resection.
- This animation technique can improve the precision of epilepsy surgery planning.