Risks and benefits of aortocoronary bypass surgery in patients aged 65 years or more.

Between January 1970 and July 1978, 85 patients aged 65 years or more underwent aortocoronary bypass surgery at the Montreal Heart Institute. The mortality during the operation and the first 29 days thereafter was 12% overall, but was only 5% when the myocardium was protected by the use of cold cardioplegic solutions. Of the 75 patients who survived this period 7 (9%) had a perioperative transmural myocardial infarction. Nonfatal noncardiac complications were more common in these patients than in younger patients, but did not lead to permanent deficits. Three patients died after discharge from hospital, two of cardiac causes. Only one patient had a nonfatal myocardial infarction after discharge. The actuarial 5-year survival rate for all the patients was 80%. After a mean follow-up period of 30 months the condition of 94% of the patients was improved by at least one class of the New York Heart Association functional classification, and 68% were asymptomatic. It is concluded that aortocoronary bypass surgery can be performed in selected older patients with a relatively low in-hospital mortality and morbidity. Symptomatic improvement occurs in almost all such patients. Cardiac catheterization and aortocoronary bypass surgery should therefore be performed in selected older patients with severe angina that is refractory to optimum medical therapy.