Oxygen Therapy in Patients with Acute Myocardial Infarction: A Systemic Review and Meta-Analysis

Abstract

ObjectiveOxygen therapy is frequently used for patients with acute myocardial infarction. The aim of this study is to perform a systematic review and meta-analysis to compare the outcomes of oxygen therapy versus no oxygen therapy in post–acute myocardial infarction settings. MethodsA systematic search of electronic databases was conducted for randomized studies, which reported cardiovascular events in oxygen versus no oxygen therapy. The evaluated outcomes were all-cause mortality, recurrent coronary events (ischemia or myocardial infarction), heart failure, and arrhythmias. Summary-adjusted risk ratios (RRs) were calculated by the random effects DerSimonian and Laird model. The risk of bias of the included studies was assessed by Cochrane scale. ResultsOur meta-analysis included a total of 7 studies with 3842 patients who received oxygen therapy and 3860 patients without oxygen therapy. Oxygen therapy did not decrease the risk of all-cause mortality (pooled RR, 0.99; 95% confidence interval [CI], 0.81-1.21; P = .43), recurrent ischemia or myocardial infarction (pooled RR, 1.19; 95% CI, 0.95-1.48; P = .75), heart failure (pooled RR, 0.94; 95% CI, 0.61-1.45; P = .348), and occurrence of arrhythmia events (pooled RR, 1.01; 95% CI, 0.85-1.2; P = .233) compared with the no oxygen arm. ConclusionsThis meta-analysis confirms the lack of benefit of routine oxygen therapy in patients with acute myocardial infarction with normal oxygen saturation levels.