Published online before print December 5, 2005, doi: 10.1161/CIRCULATIONAHA.105.561423
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(Circulation. 2005;112:3738-3744.)
© 2005 American Heart Association, Inc.
Heart Failure |
Influence of Ejection Fraction on Cardiovascular Outcomes in a Broad Spectrum of Heart Failure Patients
From the Cardiovascular Division (S.D.S., N.A., H.S., M.A.P.), Department of Medicine, Brigham and Women’s Hospital, Boston, Mass; University of Glasgow (J.J.V.M.), Glasgow, United Kingdom; Sahlgrenska University Hospital/Östra (K.S.), Göteborg, Sweden; Hamilton Health Sciences and McMaster University (S.Y.), Hamilton, Ontario, Canada; Duke University Medical Center (C.B.G.), Durham, NC; AstraZeneca LP (E.L.M.), Wilmington, Del; and London School of Hygiene (D.W., S.P.), London, United Kingdom.
Correspondence to Scott D. Solomon, MD, Cardiovascular Division, Brigham and Women’s Hospital, 75 Francis St, Boston, MA 02445.
Received May 10, 2005; revision received August 9, 2005; accepted September 7, 2005.
Background— Left ventricular function is a principal determinant of cardiovascular risk in patients with heart failure. The growing number of patients with preserved systolic function heart failure underscores the importance of understanding the relationship between ejection fraction and risk.
Methods and Results— We studied 7599 patients with a broad spectrum of symptomatic heart failure enrolled in the Candesartan in Heart failure: Assessment of Reduction in Mortality and morbidity (CHARM) Program. All patients were randomized to candesartan at a target dose of 32 mg once daily or matching placebo and followed up for a median of 38 months. We related left ventricular ejection fraction (LVEF), measured before randomization at the sites, to cardiovascular outcomes and causes of death. Mean LVEF in patients enrolled in CHARM was 38.8±14.9% (median LVEF 36%). Patients with lower LVEF tended to have higher baseline New York Heart Association class. The hazard ratio for all-cause mortality increased by 39% for every 10% reduction in ejection fraction below 45% (hazard ratio 1.39, 95% CI 1.32 to 1.46), with adjustment for baseline covariates. All-cause mortality, cardiovascular death, and all components of cardiovascular death declined with increasing ejection fraction until an ejection fraction of 45%, after which the risk of these outcomes remained relatively stable with increasing LVEF. The absolute change in rate per 100 patient-years for each 10% reduction in LVEF was greatest for sudden death and heart failure–related death. The effect of candesartan in reducing cardiovascular outcomes was consistent across LVEF categories.
Conclusions— LVEF is a powerful predictor of cardiovascular outcome in heart failure patients across a broad spectrum of ventricular function. Nevertheless, once elevated to a range above 45%, ejection fraction does not further contribute to assessment of cardiovascular risk in heart failure patients.
Key Words: heart failure • mortality • trials • cardiac function • ejection fraction
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Circulation 2005 112: 3667.
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