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Related Experiment Videos

The postictal electroencephalogram.

M Kaibara1, W T Blume

  • 1Epilepsy Unit, University Hospital, University of Western Ontario, London, Canada.

Electroencephalography and Clinical Neurophysiology
|August 1, 1988
PubMed
Summary

Postictal phenomena, or changes after seizures, primarily occurred on the same side as the seizure origin. Multiple EEG changes after seizures were linked to more widespread seizure activity and longer durations.

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Seizure·2002

Area of Science:

  • Neuroscience
  • Clinical Neurology
  • Epilepsy Research

Background:

  • Postictal phenomena are transient neurological changes occurring after seizures.
  • Understanding the characteristics of postictal phenomena is crucial for localizing seizure origins and predicting seizure evolution.
  • Previous studies have explored various aspects of postictal changes, but their laterality and duration require further detailed investigation.

Purpose of the Study:

  • To investigate the laterality and duration of postictal phenomena in patients with scalp EEG-recorded seizures.
  • To correlate postictal changes with seizure origin, evolution, and propagation patterns.
  • To identify common types of postictal EEG changes and their characteristics.

Main Methods:

  • Analysis of scalp EEG recordings from 51 patients with clearly depicted seizures, including origin, evolution, and postictal phase.
  • Identification and categorization of different types of postictal phenomena (PIC), such as regional delta, attenuation, and spike activation.
  • Assessment of the laterality and duration of these phenomena in relation to the seizure onset zone and seizure spread.

Main Results:

  • Regional delta was the most frequent postictal change (57%), followed by regional attenuation (29%) and immediate EEG normalization (31%).
  • Postictal spike activation occurred in 25% of seizures, always ipsilateral to the seizure onset lobe.
  • Postictal phenomena were predominantly ipsilateral to seizure origin and persisted longer on the side of origin when bilateral.
  • Multiple postictal changes were more common in seizures with bilateral spread or generalized convulsions (77%) and lasted longer (mean 406 sec) than single changes (79 sec).

Conclusions:

  • Postictal phenomena, particularly EEG changes, are largely ipsilateral to the seizure origin.
  • The complexity and duration of postictal phenomena correlate with the extent of seizure propagation.
  • These findings aid in the electroencephalographic localization of seizure foci and understanding seizure dynamics.

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