Air Versus Oxygen in ST-Segment–Elevation Myocardial Infarction
“Supplemental oxygen therapy in patients with ST-elevation–myocardial infarction but without hypoxia may increase early myocardial injury and was associated with larger myocardial infarct size assessed at 6 months.”
This is due to a possible increase in myocardial injury as a result of coronary vasoconstriction and heightened oxidative stress.
Reference
Circulation. 2015 Jun 16;131(24):2143-50. Air Versus Oxygen in ST-Segment-Elevation Myocardial Infarction.
https://www.ncbi.nlm.nih.gov/pubmed/26002889