Neuroanesthesia & neurocritical care

Electroencephalography for prognostication of outcome in adults with severe herpes simplex encephalitis

Ann Intensive CarePublished Retrospective cohort study

Authors' conclusion

Absence of EEG reactivity to auditory/noxious stimuli is an independent marker of poor functional outcome in severe herpes simplex encephalitis.

Study context

Population
Adult ICU patients with severe herpes simplex encephalitis with ≥1 standard EEG at ICU admission, 38 French centres, 2006–2016
Participants
214 patients
Exposure
Standard EEG findings vs poor functional outcome
Outcome
Poor functional outcome:
  • Modified Rankin Scale 3 to 6: moderate to severe disability
  • Death
Follow-up
90 days
Methodological detailsmulticentre, consecutive patients, stdEEG findings reviewed independently by two investigators
  • Multicentre
  • Consecutive patients
  • stdEEG findings reviewed independently by two investigators

Main finding

As reported in the abstract

Poor functional outcome (modified Rankin Scale (mRS) 3 to 6) at 90 days, by absence of stdEEG reactivity
Absence of reactivityOdds ratio (95% CI)
Whole population
2.80(1.19–6.58)
Subgroup of mechanically ventilated patients
4.99(1.6–15.59)

Observational data: associations, not effects.

Further findings

Poor functional outcome, absence of reactivity, adjusted for common clinical predictors and sedation at time of stdEEG · 90 days

OR (95% CI)
Whole populationAdjusted analysis2.03 (1.18–3.49)
Mechanically ventilated patientsAdjusted analysis2.62 (1.25–5.50)

Original publication

Electroencephalography for prognostication of outcome in adults with severe herpes simplex encephalitis. Ann Intensive Care. Published 23 February 2023. doi:10.1186/s13613-023-01110-3

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