Figure 1

Study population. (A) Timeline. (B) Study flow chart. (C) Proportion of HFrecEF at the 1-year follow-up in patients with HFrEF. (D) Changes in LVEF and E/e′ ratio in HFrecEF with low or high E/e′ ratio group. E/e′ peak velocity of the early wave (E) to early diastole (e′), HF heart failure, HFrecEF heart failure with recovered ejection fraction, HFrEF heart failure with reduced ejection fraction, HFuncEF heart failure with unchanged ejection fraction, ROC receiver operating characteristic.