Long-term (10-year) outcome in patients with unstable angin pectoris treated by coronary balloon angioplasty

Objectives. We sought to examine completed 10-year survival and event-free survival in patients with stable and unstable angin pectoris treated by coronary balloon angioplasty. Background. Patients with unstable angin are at increased risk for recurrent acute coronary events. Methods. The study included 208 consecutive patients (133 with stable and 75 with unstable angin pectoris) undergoing angioplasty from 1984 to 1986. The balloon crossed the lesion in 185 patients (121 with stable and 64 with unstable angin pectoris). Angioplasty was performed in patients with unstable angin pectoris 12 ± 15 days (median 8) after symptom onset. Patients with unstable angin pectoris were classified retrospectively into Braunwald class I (n = 3), class II (n = 20), class III (n = 28), class B (n = 52) and class C (n = 12). Follow-up dat were obtained from hospital charts, telephone interview and official death certificates where applicable. The study had >80% power to detect clinically significant 20% difference in survival and 20% difference in event-free survival between the stable and unstable patient groups. Results. Despite similar baseline characteristics, early (40-day) mortality was slightly higher in patients with unstable angin (4.7% [3 of 64 patients] vs. 0.8% [1 of 121 patients], p = NS). Long-term outcome was not different, because survival curves were parallel thereafter (10-year survival was 83% for those with stable and 77% for those with unstable angina, p = NS). Survival free of myocardial infarction or coronary artery bypass graft surgery at 10 years was 53% in patients with stable and 47% in patients with unstable angin (p = NS), and survival free of infarction, bypass surgery or repeat angioplasty was 32% for both groups at 10 years. In patients with Braunwald class III unstable angina, 10-year survival was 80%, as compared with 85% in other patients with unstable angina, due to the early hazard (p = NS). Survival and event-free survival were similar in patients who had had recent myocardial infarction (Braunwald class C) and in patients with acute electrocardiographic changes. Repeat hospital admissions were not more frequent in patients with unstable angin (3.1 ± 3.5 vs. 3.0 ± 2.6, p = NS). Conclusions. Ten-year survival and event-free survival were similar in patients with stable and unstable angin pectoris treated by coronary balloon angioplasty, with no evidence of an increased rate of recurrent cardiovascular events in the unstable group.