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Abstract   Aims  The role of diastolic dysfunction (DD) in prognostic evaluation in heart failure (HF) patients with impaired systolic function remains unclear. We investigated the impact of echocardiography‐defined DD on survival in HF patients with mid‐range (HFmrEF, EF 41–49%) and reduced ejection fraction (HFrEF, EF &lt; 40%).    Methods and results  A total of 2018 consecutive hospitalized HF patients were retrospectively included and divided in two groups based on baseline EF: HFmrEF group ( n  = 951, aged 69 ± 13 years, 74.2% male) and HFrEF group ( n  = 1067, aged 68 ± 13 years, 76.3% male). Clinical data were collected and analysed. All patients completed ≥1 year clinical follow‐up. The primary endpoint was defined as all‐cause death (including heart transplantation) and cardiovascular (CV)‐related death. All‐cause mortality (30.8% vs. 24.9%,  P  = 0.003) and CV mortality (19.1% vs. 13.5%,  P  = 0.001) were significantly higher in the HFrEF group than the HFmrEF group during follow‐up [median 24 (13–36) months]. All‐cause mortality increased in proportion to DD severity (mild, moderate, and severe) in either HFmrEF (17.1%, 25.4%, and 37.0%,  P  &lt; 0.001) or HFrEF (18.9%, 30.3%, and 39.2%,  P  &lt; 0.001) patients. The risk of all‐cause mortality [hazard ratio (HR) = 1.347,  P  = 0.015] and CV mortality (HR = 1.508,  P  = 0.007) was significantly higher in HFrEF patients with severe DD compared with non‐severe DD after adjustment for identified clinical and echocardiographic covariates. For HFmrEF patients, severe DD was independently associated with increased all‐cause mortality (HR = 1.358,  P  = 0.046) but not with CV mortality (HR = 1.155,  P  = 0.469).    Conclusions  Echocardiography‐defined severe DD is independently associated with increased all‐cause mortality in patients with HFmrEF and HFrEF.

Impact of diastolic dysfunction on outcome in heart failure patients with mid‐range or reduced ejection fraction