Survival 15 to 20 years after coronary bypass surgery for angina

Heart Institute, St. Vincent Hospital and Medical Center, Portland, OR.

OBJECTIVES. The aim of this study was to determine the 15- to 20-year outcome of coronary bypass surgery in patients with angina. BACKGROUND. Coronary bypass surgery has been performed for > 20 years; we need to know the expected outcome of a very long-term follow-up. METHODS. Using actuarial techniques, we determined the outcome of coronary bypass surgery performed for chronic stable and unstable angina in 7,529 patients from 1969 to 1988. RESULTS. The 5-, 10-, 15- and 20-year survival rates (mean +/- SE) were 88 +/- 1, 73 +/- 1, 53 +/- 1 and 38 +/- 3%, respectively, for the whole group. Compared with patients operated on in 1974 to 1988 (n = 7,026), patients operated on in 1969 to 1973 (n = 503) were younger and had less coronary artery disease but had a higher operative mortality rate and a shorter long-term survival time; 15- and 20-year survival of the 1969 to 1973 cohort was 47 +/- 2% and 33 +/- 3%, respectively. The 1974 to 1988 cohort of patients had a 2.1% operative mortality rate and a 10- and 15-year survival probability of 74 +/- 1% and 55 +/- 2%, respectively. For 2,128 patients with "normal" left ventricular function, the 10- and 15-year survival probability was 82 +/- 1% and 64 +/- 3%, respectively, and for 2,413 patients with "abnormal" left ventricular function, it was 66 +/- 1% and 47 +/- 3%, respectively (p < 0.0001); for men it was 74 +/- 1% and 56 +/- 2%, respectively, and for women, 70 +/- 2% and 52 +/- 5%, respectively, p < 0.05. The actuarial percentages of reoperation and myocardial infarction at 15 years were 33 +/- 2% and 26 +/- 2%, respectively; these values did not differ significantly between men and women. There was a significant (p < 0.001) difference between men and women in angina status; 81% of the men versus 74% of the women had no angina or mild angina at the most recent follow-up study. CONCLUSIONS. Coronary bypass surgery is an effective form of therapy for angina (for 15 to 20 years) in both men and women.

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