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Eur Heart J. 2013 Aug;34(29):2271-80. doi: 10.1093/eurheartj/ehs433. Epub 2013 Jan 12.

Association between resting heart rate, chronotropic index, and long-term outcomes in patients with heart failure receiving β-blocker therapy: data from the HF-ACTION trial.

Author information

1
INSERM, Center of Clinical Investigation-9501, University Hospital Nancy, Lorrain Institute of Heart and Vessels Louis Mathieu, 4, rue du Morvan, 54500 Vandoeuvre-Les-Nancy, France. d.dobre@chu-nancy.fr

Abstract

AIMS:

The aim of this study was to assess the association between resting heart rate (HR), chronotropic index (CI), and clinical outcomes in optimally treated chronic heart failure (HF) patients on β-blocker therapy.

METHODS AND RESULTS:

We performed a sub-study in 1118 patients with HF and reduced ejection fraction (EF < 35%) included in the HF-ACTION trial. Patients in sinus rhythm who received a β-blocker and who performed with maximal effort on the exercise test were included. Chronotropic index was calculated as an index of HR reserve achieved, by using the equation (220-age) for estimating maximum HR. A sensitivity analysis using an equation developed for HF patients on β-blockers was also performed. Cox proportional hazards models were fit to assess the association between CI and clinical outcomes. Median (25th, 75th percentiles) follow-up was 32 (21, 44) months. In a multivariable model including resting HR and CI as continuous variables, neither was associated with the primary outcome of all-cause mortality or hospitalization. However, each 0.1 unit decrease in CI <0.6 was associated with 17% increased risk of all-cause mortality (hazard ratio 1.17, 95% confidence interval 1.01-1.36; P = 0.036), and 13% increased risk of cardiovascular mortality or HF hospitalization (hazard ratio 1.13, 1.02-1.26; P = 0.025). Overall, 666 of 1118 (60%) patients had a CI <0.6. Chronotropic index did not retain statistical significance when dichotomized at a value of ≤ 0.62.

CONCLUSION:

In HF patients receiving optimal medical therapy, a decrease in CI <0.6 was associated with adverse clinical outcomes. Obtaining an optimal HR response to exercise, even in patients receiving optimal β-blocker therapy, may be a therapeutic target in the HF population.

KEYWORDS:

Chronic heart failure; Chronotropic incompetence; Chronotropic index; Heart rate; Heart rate reserve

PMID:
23315907
PMCID:
PMC3858021
DOI:
10.1093/eurheartj/ehs433
[Indexed for MEDLINE]
Free PMC Article

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