This is a "before and after" observational study of a therapeutic strategy to treat patients with confirmed ST-segment myocardial infarction (STEMI) with remote ischemic conditioning (RIC) before undergoing primary percutaneous coronary intervention (PCI). RIC is the purposeful application of brief, intermittent cycles of limb occlusion by inflation/deflation of a pneumatic cuff. The autoRIC device is an automatic RIC delivery device (the autoRIC® Device; CellAegis Devices Inc, Toronto, ON) that has received clearance from Health Canada for this use under the direction of a health care professional. Paramedics in the Peel and Halton regional emergency services and the Emergency department (ED) staff of Brampton Civic Hospital and Mississauga Hospital will treat patients experiencing STEMI with autoRIC, and study data will be collected from existing patient records.