Perioperative Myocardial Infarction

The goal of this observational prospective cohort study is to learn about the pathophysiology of perioperative myocardial infarction/injury in high-risk patients undergoing major non-cardiac surgery. Participants will: * Wear wearable device (Basler Band) for up to seven days after the operation or until hospital discharge * Provide three blood samples. A venous specimen of blood (25 mL) will be collected preoperatively and on postoperative days 1 and 2. * Be contacted to answer a questionnaire one year after the surgery.