Effect of ejection fraction on clinical outcomes in patients treated with omecamtiv mecarbil in GALACTIC-HF

Teerlink, J. R. et al. (2021) Effect of ejection fraction on clinical outcomes in patients treated with omecamtiv mecarbil in GALACTIC-HF. Journal of the American College of Cardiology, 78(2), pp. 97-108. (doi: 10.1016/j.jacc.2021.04.065) (PMID:34015475)

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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)

Item Type:Articles
Glasgow Author(s) Enlighten ID:McMurray, Professor John
Authors: Teerlink, J. R., Diaz, R., Felker, G. M., McMurray, J. J.V., Metra, M., Solomon, S. D., Biering-Sørensen, T., Böhm, M., Bonderman, D., Fang, J. C., Lanfear, D. E., Lund, M., Momomura, S.-I., O'Meara, E., Ponikowski, P., Spinar, J., Flores-Arredondo, J. H., Claggett, B. L., Heitner, S. B., Kupfer, S., Abbasi, S. A., and Malik, F. I.
College/School:College of Medical Veterinary and Life Sciences > Institute of Cardiovascular and Medical Sciences
Journal Name:Journal of the American College of Cardiology
ISSN (Online):1558-3597
Published Online:17 May 2021
Copyright Holders:Copyright © 2021 Elsevier on behalf of the American College of Cardiology Foundation
First Published:First published in Journal of the American College of Cardiology 78(2):97-108
Publisher Policy:Reproduced under a Creative Commons licence

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