Abstract
Between 1984 and 1989,806 patients underwent AC bypass surgery in Juntendo hospital with a 1.0% hospital mortality. Among the 798 patients discharged 795 patients were followed with a 99.6 % follow-up rate. The follow-up period was from 4.5 months to 92.8 months with a mean of 53.6 months.
The actuarial survival rate was 97% in 3 years, 95% in 5 years, and 91 % in 7 years after surgery and the mortality was 1.2% per year. Seventeen patients (40.4%) died from maligant tumors, 7 patients (6.7%) from cerebro-vascular accidents, 6 patients from cardiac reasons and 12 patients died from other causes.
Multiple logistic analysis showed that age of over 65 years, diabetes and poor left ventricular function (ejection fraction less than 45%) were significant risk factors lowering the survival rate and that the use of the internal mammary artery to the left anterior descending coronary artery significantly increased the survival rate.
