Risk factors for mortality in octogenarians undergoing myocardial revascularization surgery

Age over 80 years, by itself, is not the only risk factor for mortality in coronary artery bypass grafting.

To identify risk factors for mortality in octogenarian patients undergoing CABG.

We studied 164 patients aged 80 years and over. The variables studied were: gender; age (in years); ejection fraction (LVEF); reoperation; emergency surgery; number of revascularized arteries; use of the left internal thoracic artery (LITA); use of cardiopulmonary bypass (CPB); associated surgery; revascularization of the left anterior descending artery (DA); and use of intra-aortic balloon (IAB). Statistical analysis was done using descriptive analysis, univariate and multivariate logistic regression. A p value < 0.05 was considered statistically significant, and multivariate analysis was performed for variables whose value was p < 0.20.

Mortality was 11%. Univariate analysis showed that low LVEF (p = 0.008), emergency surgery (p < 0.001), and use of intra-aortic balloon (p = 0.049) were related to higher mortality. When adjusted by logistic regression, age over 85 years was correlated with a 6.31 times greater mortality (p = 0.012), and emergency surgery was related to a 55.39 times greater mortality (p < 0.001).

In octogenarians undergoing coronary artery bypass surgery, age over 85 years and emergency surgery are important predictors of mortality.