The mortality rate and early complications of coronary artery bypass surgery were assessed for the first 441 consecutive patients operated on at Turku University Hospital. The overall hospital mortality rate was 2.5%. Perioperative myocardial infarction (PMI) accounted for more than half of the deaths, cerebral thromboembolism and sudden coronary death each for one-fifth and left ventricular failure for one-tenth. Postoperative complications occurred in 17.7% of the patients. Bleeding and postpericardiotomy syndrome were the most common complications (in 5.2 and 3.6% of the patients). Sternal resuture was needed in 3.2% of the patients, and PMI occurred in 2.9%. PMI had a 46% mortality rate, with two-thirds of the deaths occurring in the operating theatre. Only PMI reached statistical significance as sole cause of death. Mode of myocardial protection, completeness of revascularization and severity of coronary disease did not influence the PMI rate. Graft patency overall was 92.8% on average 3 months after surgery. The respective patency rates for internal mammary artery grafts and vein grafts were 90.3 and 92.9%.
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