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Local brain activity persists during apparently generalized postictal EEG suppression.

Dirk-Matthias Altenmüller1, Andreas Schulze-Bonhage1, Christian E Elger2

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Postictal generalized EEG suppression (PGES) after seizures often shows local brain activity on intracranial EEG, not complete suppression. This finding is crucial for understanding sudden unexpected death in epilepsy (SUDEP).

Keywords:
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Area of Science:

  • Epilepsy research
  • Neurophysiology
  • Clinical neuroscience

Background:

  • Postictal generalized EEG suppression (PGES) is common after generalized convulsive seizures (GCS).
  • Conventional scalp EEG may not detect deeper brain activity during PGES.
  • PGES is implicated in the pathophysiology of sudden unexpected death in epilepsy (SUDEP).

Purpose of the Study:

  • To investigate intracranial EEG activity during apparent PGES after GCS.
  • To determine the pattern and extent of local brain activity during PGES.
  • To clarify the relationship between scalp-observed PGES and underlying intracranial activity.

Main Methods:

  • Retrospective review of video-EEG monitoring data from epilepsy patients.
  • Simultaneous intracranial and scalp EEG recordings during GCS.
  • Analysis of 25 GCS events in 15 patients with extensive intracranial electrode coverage.

Main Results:

  • In 18 of 20 GCS with apparent PGES on scalp EEG (s-PGES), intracranial EEG activity persisted or reemerged.
  • Identified three patterns: continuous local interictal activity, delayed reemergence of local activity, and persistent local ictal activity.
  • Local activity was found in 0-42% of intracranial contacts, primarily in the temporal lobe.

Conclusions:

  • Apparent PGES on scalp EEG often masks ongoing or reemerging local brain activity.
  • This localized neuronal activity during PGES may have implications for SUDEP.
  • Further research is needed to understand the role of this localized activity in SUDEP.