Coronary bypass procedures have been demonstrated to:

A. Reduce the incidence of myocardial infarction.

B. Significantly relieves angina symptoms.

C. Statistically improve the life span.

D. Improve the ejection fraction of the left ventricle in many patients in whom it is significantly depressed preoperatively. 

DISCUSSION: In a variety of studies, coronary bypass procedures have been demonstrated to reduce the incidence of subsequent myocardial infarction as well as to relieve significantly anginal symptoms. They also improve the life span of most patients as well as the ejection fraction of the left ventricle in those in whom it was depressed preoperatively.