Effect of ivabradine in patients with heart failure with preserved ejection fraction: the EDIFY randomized placebo-controlled trial.
Study Goal
The researchers aimed to determine whether heart rate reduction with ivabradine improves cardiac function, including walking distance in the 6-minute walking test, in patients with heart failure with preserved ejection fraction (HFpEF).
Results Summary
The study found no evidence of improvement in the 6-minute walking test distance or other co-primary endpoints with ivabradine compared to placebo. Heart rate reduction did not translate to meaningful clinical benefits in HFpEF patients.
Population
Patients with HFpEF in NYHA classes II and III, in sinus rhythm, with HR ≥70 b.p.m., NT-proBNP ≥220 pg/mL, and left ventricular ejection fraction ≥45%.
Effective Dosage
Ivabradine titrated to 7.5 mg twice daily.
Duration
8 months
Interactions
None mentioned
| Intervention | Direction | Endpoint | Population | Dosage | Impact | Claim # |
|---|---|---|---|---|---|---|
Ivabradine | decrease | heart rate | patients with heart failure with preserved ejection fraction (HFpEF) | -13.0 b.p.m. | reduced | #1 |
Placebo | decrease | heart rate | patients with heart failure with preserved ejection fraction (HFpEF) | -3.5 b.p.m. | reduced | #2 |
Ivabradine | no change | E/e' ratio | patients with heart failure with preserved ejection fraction (HFpEF) | +1.0 | did not improve | #3 |
Placebo | no change | E/e' ratio | patients with heart failure with preserved ejection fraction (HFpEF) | -0.6 | did not improve | #4 |
Ivabradine | no change | distance on the 6-min walking test (6MWT) | patients with heart failure with preserved ejection fraction (HFpEF) | - | did not improve | #5 |
Ivabradine | no change | plasma NT-proBNP concentration | patients with heart failure with preserved ejection fraction (HFpEF) | - | did not improve | #6 |
Ivabradine | no change | outcomes | patients with HFpEF | - | did not improve | #7 |
AIMS: This randomized, double-blind, placebo-controlled trial assessed whether heart rate (HR) reduction with ivabradine improves cardiac function in heart failure with preserved ejection fraction (HFpEF). METHODS AND RESULTS: The prEserveD left ventricular ejectIon fraction chronic heart Failure with ivabradine studY (EDIFY) included 179 patients in New York Heart Association (NYHA) classes II and III, in sinus rhythm, with HR of ≥70 b.p.m., NT-proBNP of ≥220 pg/mL (BNP ≥80 pg/mL) and left ventricular ejection fraction of ≥45%. Ivabradine (or placebo) was titrated to 7.5 mg b.i.d. Patients were followed for 8 months on the change and assessed for three co-primary endpoints: echo-Doppler E/e' ratio, distance on the 6-min walking test (6MWT), and plasma NT-proBNP concentration. At baseline, median E/e' was 12.8 [interquartile range (IQR): 9.9-16.3], median distance on the 6MWT was 320 m (IQR: 247-375 m), and median NT-proBNP was 375 pg/mL (IQR: 253-701 pg/mL). Baseline median HR was 75 b.p.m. (IQR: 70-107 b.p.m.). A total of 171 patients (87 in the ivabradine group, 84 in the placebo group) were evaluated for treatment efficacy. After 8 months of treatment, findings showed a median change in HR of -13.0 b.p.m. (IQR: -18.0 to -6.0 b.p.m.) in the ivabradine group and -3.5 b.p.m. (IQR: -11.5 to 3.0 b.p.m.) in the placebo group [estimated between-group difference: 7.7 b.p.m.; 90% confidence interval (CI) -10 to -5.4; P < 0.0001]. No evidence of improvement was found in any of the three co-primary endpoints. There was almost no change in median E/e' in either of the two groups [median change: +1.0 (IQR: -0.8 to 2.9) in the ivabradine group; -0.6 (IQR: -2.2 to 1.4) in the placebo group; estimated between-group difference: 1.4, 90% CI 0.3-2.5; P = 0.135]. There were no meaningful changes in the other co-primary endpoints and no apparent trends. There was no significant safety concern. CONCLUSIONS: In patients with HFpEF, HR reduction with ivabradine did not improve outcomes. These findings do not support the use of ivabradine in HFpEF.