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Scalp-recorded ictal patterns in focal epilepsy
1Department of Neurology, Mayo Clinic, Rochester, Minnesota 55905.
Summary
Scalp electroencephalography (EEG) can detect focal seizures, especially temporal ones, but may miss seizures due to location or orientation. Implanted electrodes improve detection of seizures missed by scalp EEG.
Area of Science:
- Neurology
- Neurophysiology
- Epilepsy Research
Background:
- Scalp-recorded focal electroencephalography (EEG) seizure patterns typically show rhythmic, evolving activity across multiple ictal phases.
- These patterns are common in temporal complex partial seizures but less frequent in frontal or simple partial seizures.
Purpose of the Study:
- To analyze the characteristics of focal seizure patterns detected by scalp EEG.
- To explain why some focal seizures are not detected by scalp EEG and how implanted electrodes improve detection.
Main Methods:
- Review and analysis of scalp-recorded focal electroencephalography (EEG) seizure patterns.
- Comparison of detection rates between scalp EEG and implanted electrodes for focal seizures.
Main Results:
- Scalp EEG patterns are typically rhythmic and evolve through ictal and postictal phases.
- Seizure detection failure by scalp EEG is often due to seizure location, size, or orientation.
- Implanted electrodes can detect seizure discharges missed by scalp electrodes.
Conclusions:
- Scalp EEG is valuable for detecting focal seizures, particularly temporal ones.
- Implanted electrodes offer superior detection for focal seizures when scalp EEG is insufficient.
- While scalp EEG lateralization can be misleading, it often accurately localizes well-lateralized seizures.