The Prognosis of Patients with Coronary Artery

more major coronary arteries determined by preoperative coronary arteriography and relatively stable and disabling (New York Heart Association Functional Class III and IV) angina pectoris. During the total observation period there were 35 deaths: 18 early and 17 late. The over-all 4-year survival rate by life-table methods was 89%, and it differed among patients with one-vessel involvement (96%), two-vessel involvement (89%), and three-vessel involvement (84%), but not significantly so. The patency rate of bypass grafts determined in 191 patients at a mean time of six months postoperatively was 76%. Functional class I and II status was 93% during the first year and was 75% during the fourth year after operation in observed survivors.