Abstract:Objective: To observe effects of different analgesics on myocardial ischemia(MI) in patients with coronary heart disease(CHD) undergoing noncardiac surgery.Methods: 169 patients were divided into three groups,patient contralled epidural analgesia(PCEA) group,IM group and control group.The incidence of MI,the number of ischemic episodes per hour,the duration of MI,the area under the curve per hour and VAS scores were recorded for at least 48 hours after surgery.Results: Systemic relieving pain using PCEA availably reduced the incidence of MI,the number of ischemic episodes per hour,the duration of MI,the area under the curve per hour and VAS scores.There was significant difference between PCEA group and the other groups(P<0.01).Conclusion: Perfect relieving pain is necessary after surgery and can reduce MI in CHD patients undergoing noncardiac surgery.