The document summarizes the DELIVER trial which studied the effects of dapagliflozin in patients with heart failure with preserved ejection fraction (HFpEF) and mildly reduced ejection fraction. The trial found that dapagliflozin reduced the composite of worsening heart failure events, cardiovascular death, and total worsening heart failure events compared to placebo in over 6,000 patients. The benefits were consistent across subgroups including those with and without diabetes, prior reduced ejection fraction, and recent hospitalization for heart failure.