Subdural electrodes
Intracranial electrodes placed directly on the brain surface beneath the dura mater for precise seizure localization.
Full Definition
Subdural electrodes are invasive monitoring devices surgically placed on the cortical surface underneath the dura mater during presurgical evaluation. They provide high-resolution electrocorticographic recordings with superior spatial localization compared to scalp EEG. These electrodes are typically arranged in grids or strips and allow for both seizure monitoring and functional mapping. The procedure carries surgical risks but is essential for determining resectable epileptic zones in complex cases where non-invasive methods are insufficient.
Usage
Usage note: Always specify placement location and distinguish from depth electrodes in clinical documentation.
In Context
- "The patient underwent placement of subdural electrodes for chronic monitoring to identify the seizure onset zone." — Presurgical evaluation report
- "Subdural electrodes revealed ictal onset in the left mesial temporal region with rapid spread to lateral temporal cortex." — Epilepsy monitoring unit note