Effect of Remote Preconditioning in Patients Undergoing Off-pump Coronary Artery Bypass Graft Surgery

In recent several clinical trials, remote preconditioning showed very powerful myocardial protection. However, the myocardial protective effect by remote preconditioning was not evaluated on the patients undergoing off pump coronary artery bypass graft surgery (OPCAB). The investigators hypothesized that the lower limb remote preconditioning could protect the myocardium during the OPCAB. In this study, the investigators will try to evaluate whether remote preconditioning could induce myocardial protection on the OPCAB patients.