The University of Pittsburgh Institutional Review Board approved this study. We performed an observational cohort study of consecutive patients hospitalized at a single academic center from April 2010 to October 2014 with ≥6 hours of EEG monitoring. We maintain a registry of all patients treated by our Post-Cardiac Arrest Service including demographic and disease-specific baseline characteristics, treatments and outcomes. Our local standard of care is to monitor all comatose survivors of CA with continuous EEG,[17 (link)] and during the study period we cooled all comatose post-CA patients to 33°C We excluded patients from this analysis for arrest from trauma, exsanguination, or catastrophic neurological event (arrest secondary to subarachnoid hemorrhage, stroke or status epilepticus), for 24 hours, regardless of initial rhythm or arrest location. and those who died or were transitioned to comfort measures only within 6 hours of presentation.