This is an observational substudy embedded in the STEPCARE Trial. The study involves EEG analysis, covered by the ethics approval of STEPCARE Trial. The investigators aim to compare the accuracy of a continuously measured algorithm-based EEG index, C-Trend Index, with retrospective visual analysis of continuous EEG in predicting favorable functional outcome in adult patients treated in intensive care units after out-of-hospital cardiac arrest. The primary hypothesis is that the accuracy of C-Trend Index has at least 10% better accuracy in predicting favorable outcome than the visual analysis of cEEG, when assessed early, 9-12 hours after return of spontaneous circulation (ROSC).
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Predictive accuracy of C-Trend Index >20 for favorable functional outcome
Timeframe: cEEG is recorded at least 24 hours after inclusion to the study, or until the patient awakens to respond to verbal commands. Data collected from recorded cEEG and C-Trend Index are assessed from the time point of 9-12 hours from ROSC.