“…6 More recent studies have called this routine practice into question, with a similar signal toward more negative outcomes. 7 Adverse physiological effects of supplemental oxygen related to increasing coronary vascular resistance and generation of reactive oxygen species have been described, 8,9 fueling the need for an adequately powered randomized, clinical trial. 7 In this issue of Circulation, Stub and colleagues 10 sought to determine the relationship between supplemental oxygen compared with no oxygen therapy with infarct size in normoxic patients with STEMI undergoing primary PCI within the Air Versus Oxygen Myocardial Infarction (AVOID) study.…”