Efficacy of SGLT2-inhibitors across different definitions of heart failure with preserved ejection fraction

AimsSodium-glucose cotransporter 2 inhibitors (SGLT2i) have been evaluated in phase 3 randomized-controlled trials (RCTs) that enrolled individuals with heart failure and preserved ejection fraction (HFpEF) based on detailed clinical, biochemical, and echocardiographic criteria (hereafter HF-RCTs), and in cardiovascular outcomes trials (CVOTs) in diabetic patients, in which the diagnosis of HFpEF relied on medical history. Methods: and resultsWe performed a study-level meta-analysis of the efficacy of SGLT2i across different definitions of HFpEF. Three HF-RCTs (EMPEROR-Preserved, DELIVER, and SOLOIST-WHF) and four CVOTs (EMPA-REG OUTCOME, DECLARE-TIMI 58, VERTIS-CV, and SCORED) were included, for a total of 14 034 patients. SGLT2i reduced the risk of cardiovascular death or heart failure hospitalization (HFH) in all RCTs pooled together [risk ratio 0.75, 95% confidence interval (95% CI) 0.63-0.89, NNT 19], in HF-RCTs (risk ratio 0.71, 95% CI 0.52-0.97, NNT 13), and in CVOTs (risk ratio 0.78, 95% CI 0.60-0.99, NNT 26). SGLT2i also decreased the risk of HFH in all RCTs (risk ratio 0.81, 95% CI 0.73-0.90, NNT 45), in HF-RCTs (risk ratio 0.81, 95% CI 0.72-0.93, NNT 37), and in CVOTs (risk ratio 0.78, 95% CI 0.61-0.99, NNT 46). By contrast, SGLT2i were not superior to placebo for cardiovascular death or all-cause death in all RCTs, HF-RCTs, or CVOTs. Results were comparable after excluding one RCT at a time. Meta-regression analysis confirmed that the type of RCT (HF-RCT vs. CVOT) did not influence the SGLT2i effect. Conclusions: In RCTs, SGLT2i improved the outcomes of patients with HFpEF regardless of how the latter was diagnosed.