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Related Experiment Video

Updated: Apr 7, 2026

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Which EEG patterns in coma are nonconvulsive status epilepticus?

Eugen Trinka1, Markus Leitinger2

  • 1Department of Neurology, Christian Doppler Klinik, Paracelsus Medical University, Salzburg, Austria; Centre for Cognitive Neuroscience, Salzburg, Austria.

Epilepsy & Behavior : E&B
|July 8, 2015
PubMed
Summary
This summary is machine-generated.

Nonconvulsive status epilepticus (NCSE) in coma is common. Modified criteria for diagnosing NCSE in comatose patients improve accuracy, distinguishing true seizures from other EEG patterns.

Keywords:
ComaEEGEEG criteriaEpilepsyNonconvulsive status epilepticus

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Area of Science:

  • Neurology
  • Clinical Neurophysiology
  • Epileptology

Background:

  • Nonconvulsive status epilepticus (NCSE) occurs in 5-48% of comatose patients.
  • Epileptiform EEG patterns in deep coma are common, but their relation to NCSE is debated.
  • Distinguishing NCSE from other EEG patterns in coma is challenging.

Purpose of the Study:

  • To review EEG patterns in coma, including fluctuations and transitions.
  • To propose modified criteria for diagnosing NCSE in comatose patients.
  • To differentiate NCSE from other EEG phenomena in critically ill and comatose individuals.

Main Methods:

  • Review of existing literature on EEG patterns in coma.
  • Modification of Salzburg Consensus Criteria for NCSE based on American Clinical Neurophysiology Society terminology.
  • Validation of modified criteria in three distinct patient cohorts.

Main Results:

  • Classical coma EEG patterns (e.g., burst suppression) do not indicate NCSE.
  • Ictal patterns or epileptiform discharges >2.5 Hz in comatose patients suggest NCSE and require treatment.
  • Modified criteria showed high sensitivity (97.2%), specificity (95.9%), and accuracy (96.3%) in patients with clinical NCSE signs.

Conclusions:

  • Proposed modified criteria enhance NCSE diagnosis in comatose patients.
  • Specific EEG patterns (GPDs/LPDs <2.5 Hz, RDs >0.5 Hz) require additional criteria for NCSE diagnosis.
  • Further validation in deep coma cohorts is needed; current criteria are effective for clinically suspected NCSE.