Unstable angina pectoris is often premonitory to an acute myocardial infarction. Surgical revascularization in this syndrome is of great potential benefit and relatively low mortality. A patient with unstable angina pectoris is reported. A 65-year-old man complained of dyspnea and pain in the left anterior chest. The pain was brought on by mild exercise, occurred at rest and sleeping time. The pain worsened over a month period and more aggravated in intensity and duration. Physical examination showed no abnormalities except hypertension and laboratory data were within normal limits. His anginal pain was not relived by nitroglycerin ingestion. Preoperative coronary angiograms revealed significant obstruction [>90%] of left anterior descending coronary artery. Aorto-left anterior descending coronary bypass with autogenous saphenous vein used as conduit was performed. The postoperative course was uneventful and he was discharged on 16th postoperative day in a healthy condition.