Effect of Ejection Fraction on Clinical Outcomes in Patients Treated With Omecamtiv Mecarbil in GALACTIC-HF.

Journal Article (Clinical Trial, Phase III;Journal Article)

BACKGROUND: In GALACTIC-HF (Global Approach to Lowering Adverse Cardiac outcomes Through Improving Contractility in Heart Failure) (n = 8,256), the cardiac myosin activator, omecamtiv mecarbil, significantly reduced the primary composite endpoint (PCE) of time-to-first heart failure event or cardiovascular death in patients with heart failure and reduced ejection fraction (EF) (≤35%). OBJECTIVES: The purpose of this study was to evaluate the influence of baseline EF on the therapeutic effect of omecamtiv mecarbil. METHODS: Outcomes in patients treated with omecamtiv mecarbil were compared with placebo according to EF. RESULTS: The risk of the PCE in the placebo group was nearly 1.8-fold greater in the lowest EF (≤22%) compared with the highest EF (≥33%) quartile. Amongst the pre-specified subgroups, EF was the strongest modifier of the treatment effect of omecamtiv mecarbil on the PCE (interaction as continuous variable, p = 0.004). Patients receiving omecamtiv mecarbil had a progressively greater relative and absolute treatment effect as baseline EF decreased, with a 17% relative risk reduction for the PCE in patients with baseline EF ≤22% (n = 2,246; hazard ratio: 0.83; 95% confidence interval: 0.73 to 0.95) compared with patients with EF ≥33% (n = 1,750; hazard ratio: 0.99; 95% confidence interval: 0.84 to 1.16; interaction as EF by quartiles, p = 0.013). The absolute reduction in the PCE increased with decreasing EF (EF ≤22%; absolute risk reduction, 7.4 events per 100 patient-years; number needed to treat for 3 years = 11.8), compared with no reduction in the highest EF quartile. CONCLUSIONS: In heart failure patients with reduced EF, omecamtiv mecarbil produced greater therapeutic benefit as baseline EF decreased. These findings are consistent with the drug's mechanism of selectively improving systolic function and presents an important opportunity to improve the outcomes in a group of patients at greatest risk. (Registrational Study With Omecamtiv Mecarbil/AMG 423 to Treat Chronic Heart Failure With Reduced Ejection Fraction [GALACTIC-HF]; NCT02929329).

Full Text

Duke Authors

Cited Authors

  • Teerlink, JR; Diaz, R; Felker, GM; McMurray, JJV; Metra, M; Solomon, SD; Biering-Sørensen, T; Böhm, M; Bonderman, D; Fang, JC; Lanfear, DE; Lund, M; Momomura, S-I; O'Meara, E; Ponikowski, P; Spinar, J; Flores-Arredondo, JH; Claggett, BL; Heitner, SB; Kupfer, S; Abbasi, SA; Malik, FI; GALACTIC-HF Investigators,

Published Date

  • July 13, 2021

Published In

Volume / Issue

  • 78 / 2

Start / End Page

  • 97 - 108

PubMed ID

  • 34015475

Electronic International Standard Serial Number (EISSN)

  • 1558-3597

Digital Object Identifier (DOI)

  • 10.1016/j.jacc.2021.04.065


  • eng

Conference Location

  • United States