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Background The relationship between diastolic dysfunction (DD) and outcome after CRT is debated. Purpose Purpose of this study was to evaluate the role of DD in predicting all-cause mortality in heart failure patients undergoing CRT. Methods One-hundred ninety-three patients (age: 67±11 years, QRS width: 167±21 ms, LVEF 28±8%) were included in this multicentre prospective study. Mitral filling pattern, mitral tissue Doppler velocity, tricuspid regurgitation velocity, and indexed left atrial volume were used to classify DD from grade I to III according to the 2016 recommendations of the American Society of Echocardiography/European Association of Cardiovascular Imaging. A reduction of LV end-systolic volume &amp;gt;15% at 6-month follow-up (FU) identified CRT-responders and was observed in 132 (68%) patients. Results During a median 35 months FU, 29 (15%) patients died. Through multivariable analysis, coronary artery disease, NYHA functional class and grade I DD were shown to be independent predictors of prognosis (Table 1). Grade I DD was associated with a longer survival rate in both responders and non responders (Figure 1). Non responders with grade II-III DD had the worse outcome (HR 12.5 [3.56–44.04], p&amp;lt;0.0001). Conclusions Better diastolic function at baseline is associated with an improved survival after CRT implantation, independently of CRT-response. Funding Acknowledgement Type of funding source: None

Better diastolic function in CRT candidates is associated with improved survival after CRT implantation