Right ventricular dysfunction and risk of heart failure and mortality after myocardial infarction

Abstract

ObjectivesThe aim of this study was to determine the prognostic value of right ventricular (RV) function in patients after a myocardial infarction (MI). BackgroundRight ventricular function has been shown to predict exercise capacity, autonomic imbalance and survival in patients with advanced heart failure (HF). MethodsTwo-dimensional echocardiograms were obtained in 416 patients with left ventricular (LV) dysfunction (ejection fraction [LVEF] ≤40%) from the Survival And Ventricular Enlargement (SAVE) echocardiographic substudy (mean 11.1 ± 3.2 days post infarction). Right ventricular function from the apical four-chamber view, assessed as the percent change in the cavity area from end diastole to end systole (fractional area change [FAC]), was related to clinical outcome. ResultsRight ventricular function correlated only weakly with the LVEF (r = 0.12, p = 0.013). On univariate analyses, the RV FAC was a predictor of mortality, cardiovascular mortality and HF (p < 0.0001 for all) but not recurrent MI. After adjusting for age, gender, diabetes mellitus, hypertension, previous MI, LVEF, infarct size, cigarette smoking and treatment assignment, RV function remained an independent predictor of total mortality, cardiovascular mortality and HF. Each 5% decrease in the RV FAC was associated with a 16% increased odds of cardiovascular mortality (95% confidence interval 4.3% to 29.2%; p = 0.006). ConclusionsRight ventricular function is an independent predictor of death and the development of HF in patients with LV dysfunction after MI.