Impact of Enhanced External Counterpulsation on Vascular Hemodynamics and Status

Inclusion Criteria: * More than 50% stenosis of left main trunk and 3 epicardial coronary arteries and their large branches showed by coronary angiography * Or history of myocardial infarction * Or history of prior revascularization * Signed informed consent to participate in the study Exclusion Criteria: * Clinically significant valvular heart disease * Aortic aneurysm * Congenital heart disease * Acute myocarditis * Arrythmias significantly interfere with the triggering of the EECP device * History of cerebral hemorrhage * Hemorrhagic disease * Lower limb infection, phlebitis * Deep venous thrombosis * Malignant disease * INR \> 2.5 * Uncontrolled hypertension, defined as SBP \> 180mmHg or DBP \> 110mmHg * Pregnancy