Predictors of Survival From Out-of-Hospital Cardiac Arrest A Systematic Review and Meta-Analysis

TLDR: In this paper, the authors evaluated the strength of associations between out-of-hospital cardiac arrest and key factors (event witnessed by a bystander or emergency medical services [EMS], provision of bystander cardiopulmonary resuscitation [CPR], initial cardiac rhythm, or the return of spontaneous circulation) and examined trends in OHCA survival over time.

Abstract: Background— Prior studies have identified key predictors of out-of-hospital cardiac arrest (OHCA), but differences exist in the magnitude of these findings In this meta-analysis, we evaluated the strength of associations between OHCA and key factors (event witnessed by a bystander or emergency medical services [EMS], provision of bystander cardiopulmonary resuscitation [CPR], initial cardiac rhythm, or the return of spontaneous circulation) We also examined trends in OHCA survival over time Methods and Results— An electronic search of PubMed, EMBASE, Web of Science, CINAHL, Cochrane DSR, DARE, ACP Journal Club, and CCTR was conducted (January 1, 1950 to August 21, 2008) for studies reporting OHCA of presumed cardiac etiology in adults Data were extracted from 79 studies involving 142 740 patients The pooled survival rate to hospital admission was 238% (95% CI, 211 to 266) and to hospital discharge was 76% (95% CI, 67 to 84) Stratified by baseline rates, survival to hospital discharge was more