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Seizure localization by chronic ambulatory electrocorticography.
Alvin Y Chan1, Robert C Knowlton2, Edward F Chang3
1Medical College of Wisconsin, Milwaukee, WI 53226, USA.
Clinical Neurophysiology Practice
|December 19, 2018
Summary
Chronic ambulatory electrocorticography successfully localized seizures in two epilepsy patients unresponsive to standard treatments. This neurostimulation technique aided diagnosis when initial monitoring proved inconclusive, offering new hope for seizure localization.
Area of Science:
- Neurology
- Neuroscience
- Medical Devices
Background:
- Medically-refractory focal epilepsy presents diagnostic challenges.
- Intracranial monitoring studies can be non-diagnostic for seizure localization.
- Advanced neurostimulation devices offer potential for improved epilepsy management.
Observation:
- Two patients with refractory focal epilepsy underwent chronic ambulatory electrocorticography using an implanted neurostimulation device.
- Initial intracranial monitoring failed to localize seizure onset zones.
- Electrodes were strategically placed at suspected seizure onset regions.
Findings:
- The implanted neurostimulator successfully recorded seizures in both patients after extended monitoring periods (49 days and 7.5 months).
- Chronic ambulatory electrocorticography provided crucial diagnostic data for seizure localization.
- This method proved effective even with delayed seizure detection post-implantation.
Implications:
- Chronic ambulatory electrocorticography is a valuable tool for seizure localization in select epilepsy cases.
- The technique offers diagnostic utility when a precise hypothesis about seizure origin exists.
- Limited spatial sampling remains a consideration, necessitating careful electrode placement and interpretation.
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