3152Right ventricular function and long-term outcomes in cardiac resynchronization therapy patients enrolled in MADIT-CRT

Background Long-term predictive value of baseline right ventricular (RV) function and CRT-induced changes of RV function for the clinical outcomes, mortality or heart failure are not well understood, especially in mild HF patients implanted with CRT-D. Methods MADIT-CRT enrolled 1,820 patients at 110 centers worldwide, with either ischemic cardiomyopathy (New York Heart Association [NYHA] functional class I or II), or non-ischemic cardiomyopathy (NYHA functional class II only), sinus rhythm, ejection fraction of 30% or less, and a QRS duration of 130 ms or more. We assessed right ventricular function (RVF) as RV fractional area change by echocardiography at baseline and after 1 year of therapy in patients with LBBB assigned to CRT arm (n=633). Kaplan-Meier survival analyses and multivariate Cox models were utilized to identify RV parameters predicting long-term outcomes of HF or death events. Results During the median follow up of 5.6 years 192 (30.3%) patients had heart failure or death. CRT-D LBBB patients with below or above median RV end-systolic area (RVS) had lower cumulative probabilities of HF/death (p=0.02). Lower, than the median value of both RVS and RVF were associated with higher risk of HF events alone (p=0.004; p=0.01 respectively). In multivariate analysis, after adjustment of relevant clinical covariates more RV reverse remodeling in the terms of RV end-diastolic area (RVD) decrease proved to be an independent predictor for 5-year all-cause mortality (HR: 0.4; p=0.03). Kaplan-Meier analysis of baseline RVF Conclusions Based on our results RV geometry and function before CRT implant and also significant RV reverse remodeling at 12 months follow up are significant predictors of long-term outcomes.