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Cyclic electrographic seizures in critically ill patients.

David E Friedman1, Catherine Schevon, Ronald G Emerson

  • 1Comprehensive Epilepsy Center, Columbia University Medical Center, New York, New York, U.S.A. dfriedm@bcm.tmc.edu

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Cyclic seizures, a pattern of recurring seizures, are readily detectable using compressed spectral array (CSA) displays of electroencephalogram (EEG) data. This visualization method aids in recognizing patterns difficult to discern on standard EEG recordings.

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Area of Science:

  • Neuroscience
  • Clinical Neurology
  • Epileptology

Background:

  • Prolonged electroencephalographic (EEG) monitoring is crucial for detecting nonconvulsive seizures.
  • Compressed displays of EEG frequency spectra, such as compressed spectral array (CSA), enhance the interpretation of continuous EEG data.
  • CSA allows visualization of evolving patterns over extended periods on a single screen.

Purpose of the Study:

  • To describe a specific cyclic pattern of recurring seizures identified through EEG analysis.
  • To highlight the utility of compressed spectral array (CSA) in recognizing this seizure pattern.

Main Methods:

  • Retrospective identification of patients exhibiting a cyclic seizure pattern on CSA over a 4-year period.
  • Analysis of EEG data from 13 critically ill patients of all ages.

Main Results:

  • A cyclic pattern of recurring seizures was observed in 13 critically ill patients.
  • Some patients demonstrated a gradual increase in EEG power preceding each seizure event.
  • This cyclic pattern was readily apparent on CSA but difficult to recognize on standard EEG.

Conclusions:

  • Cyclic seizures, though potentially not rare, are challenging to identify with standard EEG but easily detectable with CSA.
  • The pathophysiology of cyclic seizures remains unknown; they may represent a form of status epilepticus with transiently effective seizure-terminating factors.
  • Studying patients with cyclic seizures could offer insights into the mechanisms of seizure initiation and cessation.