Summary: For patients with suspected acute myocardial infarction (AMI) and an oxygen saturation 90% or higher at baseline, an approach of providing ambient air only (ie, no supplemental oxygen) may be associated with no difference in the risk of death from any cause within 1 year or rehospitalization with AMI within 1 year compared to an approach of providing supplemental oxygen (6 liters per minute for 6 to 12 hours).

https://www.ncbi.nlm.nih.gov/m/pubmed/28844200/

Strength of Recommendation = B