Effect of Dapagliflozin on health-related quality of life in patients with heart failure: a meta-analysis of Randomized Controlled Trials

Abstract Introduction Dapagliflozin, a sodium-glucose cotransporter 2 (SGLT2) inhibitor, reduces the risk of cardiovascular mortality and hospitalization for heart failure among individuals with chronic heart failure with reduced (HFrEF) or preserved ejection fraction (HFpEF). The effect of dapagliflozin on symptoms, physical capacity and quality of life is still unclear in this population. Purpose To investigate the effects of dapagliflozin on symptoms and health-related quality of life improvement in patients with chronic heart failure. Methods We systematically searched PubMed, Embase and Cochrane Central databases for randomized controlled trials (RCTs) comparing dapagliflozin to placebo in patients with chronic heart failure. We pooled mean differences (MD) and 95% confidence intervals (CI) with a random-effects model for continuous outcomes. Subgroup analyses were performed by reduced or preserved ejection fraction (EF). The outcomes analyzed were change in Kansas City Cardiomyopathy Questionnaire (KCCQ) score and six-minute walk test (6MWT). Results Five RCTs with 6,238 patients were included. Of these, 5,410 (86.7%) presented a reduced EF and 2,724 (43.65%) had diabetes. There was a statistical significant improvement in total symptoms score (KCCQ-TSS) (MD=3.08; 95% CI 2.14-4.02; p<0.00001; I2=0%; Fig.1A) and in physical limitation score (KCCQ-PLS) (MD=3.91; 95% CI 1.66-6.17; p=0.0007; I2=0%; Fig1B) when dapagliflozin was compared to placebo. Subgroup analyses showed that the KCCQ-TSS score were significant higher in patients treated with dapagliflozin when compared to placebo in HFrEF (MD= 2.98; 95% CI 1.96-.99; p<0.00001; I2=0%; Fig1A) and HFpEF group (MD=3.73; 95% CI 1.16-6.30; p=0.004; I2=0%; Fig1A). The KCCQ-PLS score had a significant increase after dapagliflozin treatment when compared to placebo in participants with HFrEF (MD=4.36; 95% CI 0.72-8.00; p=0.02; I2=0%; Fig1B) and HFpEF (MD=3.64; 95% CI 0.76-6.51; p=0.01; I2=0%; Fig1B). There was no significant difference in 6MWT in dapagliflozin versus placebo group (MD=5.78; 95% CI -0.48-12.03; p=0.07; I2=0%; Fig.2). Conclusions Dapagliflozin improves health-related quality of life by reducing symptoms and physical limitation in patients with HFrEF and HFpEF.