Postictal generalized EEG suppression: an inconsistent finding in people with multiple seizures.

Area of Science:

• Epilepsy research
• Clinical neurophysiology

Background:

• Postictal generalized EEG suppression (PGES) exceeding 20 seconds is a potential predictor for sudden unexpected death in epilepsy (SUDEP).
• Understanding the consistency and influencing factors of PGES is crucial for its clinical application.

Purpose of the Study:

• To evaluate the consistency of PGES >20 seconds after convulsive seizures (CS).
• To identify clinical factors that may facilitate the occurrence of PGES.

Main Methods:

• Retrospective analysis of video-EEG data from 59 individuals with at least two recorded CS.
• Independent assessment of PGES presence and duration by two blinded observers.
• Statistical analysis to determine intraindividual consistency and correlations with clinical characteristics.

Main Results:

• PGES >20 seconds was observed in 63% of individuals and 37% of CS.
• The consistency of PGES >20 seconds decreased with a higher number of recorded CS per individual.
• PGES >20 seconds was more frequent during seizures originating from sleep (OR 3.29) and during antiepileptic drug tapering (OR 4.80).

Conclusions:

• PGES >20 seconds is an inconsistent finding in individuals, making it an unreliable predictor for SUDEP.
• Seizures occurring during sleep and reduction in antiepileptic medication appear to promote PGES.