Perioperative Hypothermia and Myocardial Injury After Non-cardiac Surgery

Inclusion Criteria: * Scheduled for major noncardiac surgery expected to last 2-6 hours; * Having general anesthesia; * Expected to require at least overnight hospitalization; * Expected to have \>50% of the anterior skin surface available for warming; * Have at least one of the following risk factors: a. Age over 65 years; b. History of peripheral vascular surgery; c. History of coronary artery disease; d. History of stroke or transient ischemic attack; e. Serum creatinine \>175 µmal/L (\>2.0 mg/dl); f. Diabetes requiring medication; e. Hypertension requiring medication; g. Current smoking. Exclusion Criteria: * Have a clinically important coagulopathy in the judgement of the attending anesthesiologist; * Are septic (clinical diagnosis by the attending anesthesiologist); * Body mass index exceeding 30 kg/m2; * End-stage renal disease requiring dialysis; * Surgeon believes patient to be at particular infection risk.