In patients undergoing off-pump coronary artery bypass (OPCAB) surgery with different anesthesia regimens: remifentanil (0.75 mcg/kg/min) and propofol (TCI effect-site concentration 0.8-1.5 mcg/ml) (Group -RP); remifentanil (0.75 mcg/kg/min) and sevoflurane (end-tidal 0.8 vol%) (Group-RS), or sevoflurane (end-tidal 1.2-2.8 vol%)-sufentanil (TCI effect site concentration 0.35-0.75 ng/ml) (Group-SS), intergroup difference in the level of Troponin I (c-TnI) and creatinine kinase subtype-MB is determined before surgery (control), during vascular graft harvesting (harvesting), after completing graft construction (postgrafting), and one day after surgery (postoperative).

To determine the difference of myocardial injury upon using different anesthesia regimens: remifentanil-based regimen versus sevoflurane-sufentanil balanced regimen.

Patients undergoing off-pump coronary artery bypass (OPCAB) surgery are randomly allocated to get remifentanil (0.75 mcg/kg/min) and propofol (TCI effect-site concentration 0.8-1.5 mcg/ml) (Group -RP), remifentanil (0.75 mcg/kg/min) and sevoflurane (end-tidal 0.8 vol%) (Group-RS), or sevoflurane (end-tidal 1.2-2.8 vol%)-sufentanil (TCI effect site concentration0.35-0.75 ng/ml) (Group-SS).

Intergroup difference in the level of Troponin I (c-TnI) and creatine kinase-MB is determined before surgery (control), during vascular graft harvesting (harvesting), after completing graft construction (postgrafting), 1 day after surgery (postoperative).

Inclusion Criteria:

• patient undergoing OPCAB surgery
• patient signed written informed consent

Exclusion Criteria:

• patient with Intra-aortic balloon pump
• patient with renal replacement therapy
• patient wants to withdraw the participation to the study