At present, there are 290 million cardiovascular patients in China, including 11 million patients with coronary heart disease. Remote ischemic preconditioning(RIPC) may play an effective endogenous cardiac protection.This study will explore whether long-term use of RIPC in patients with AMI after PCI and non interventional therapy can reduce the incidence of major adverse cardiovascular cerebrovascular events(MACCE) and improve clinical outcomes and long-term prognosis.

A total of 2146 patients with AMI are expected included as the research objects and randomly divided into experimental group and control group with 1073 cases in each group. After admission, Patients in the experimental group received everyday RIPC of upper limbs to the end of follow-up.The control group is a blank control and undergoes conventional medical procedures. Routine blood indexes, ultrasound, electrocardiogram, were detected On the day of admission. 12 months post- discharge, the incidence of MACCE(include Cardiovascular death, non-fatal acute myocardial infarction, stent thrombosis, revascularization, stroke, admission due to heart failure and the above composite events were independent components) and Poce(All deaths, all strokes, all myocardial infarction, or all revascularization events)will recorded by telephone follow-up.

Inclusion Criteria:

• Patients with acute myocardial infarction were diagnosed in accordance with the criteria of the "Global Unified Definition of Fourth Myocardial Infarction"

Exclusion Criteria:

• The patients could not tolerate RIPC or RIPerC
• Aortic dissection, coronary artery aneurysm, coronary artery fistula and other systemic organic diseases
• The uncontrolled systolic blood pressure and diastolic blood pressure of severe hypertension were 180 mmHg and 120 mmHg respectively
• severe liver dysfunction (bilirubin > 20 mmol / L, prothrombin time > 2.0 ratio)
• Severe renal insufficiency (GFR < 30 ml / min / 1.73 m2);
• patients taking nicorandil and other drugs affecting microcirculation
• pregnant