Coronary angiography or not after cardiac arrest without ST segment elevation: A systematic review and meta-analysis

This meta-analysis aimed to review the available evidence and evaluate the necessity of immediate coronary angiography (CAG) to obtain positive outcomes for out-of-hospital cardiac arrest (OHCA) patients without ST segment elevation. Web of Science, PubMed, Embase, Chinese National Knowledge Infrastructure, Wanfang, and SinoMed databases. We included observational and case-control studies of outcomes among individuals without ST segment elevation experiencing OHCA who had immediate, delayed, or no CAG. We extracted study details, as well as patient characteristics and outcomes. Six studies (n = 2665) investigating mortality until discharge demonstrated a significant increase in survival benefit with early CAG (odds ratio [OR] = 1.78; 95%CI = 1.51-2.11; I = 81%; P