Abstract 33: Survival from Out-of-Hospital Cardiac Arrest Is Lowest at Night: Findings from the Cardiac Arrest Registry to Enhance Survival (CARES)

TL;DRAbstract

Background: Understanding temporal variability in the incidence and outcomes of out-of-hospital cardiac arrest (OHCA) has important implications for pre-hospital resource planning and structuring systems for OHCA care. Methods: Using the Cardiac Arrest Registry to Enhance Survival (CARES) database, we studied patients with OHCA of presumed cardiac etiology who were treated by emergency medical services (EMS) from 10/2005 to 12/2010. Measures of pre-hospital care, survival to hospital discharge, and neurologic outcomes were compared between OHCA occurring during daytime (0701-1500h), evening (1501-2300h), and overnight (2301-0700h). Results: The frequency of OHCA varied significantly across time blocks with 7503 (40.4%) occurring during daytime, 6883 (37.0%) during evening, and 4202 (22.6%) occurring overnight (p<0.0001). Compared with OHCA patients during daytime or evening, those with OHCA overnight were more likely to be younger, arrest at home, have an unwitnessed arrest, have a

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