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Identifying responders to oral iron supplementation in heart failure with a reduced ejection fraction

a post-hoc analysis of the IRONOUT-HF trial

Ambrosy, Andrew P.a,b; Lewis, Gregory D.c; Malhotra, Rajeevc; Jones, Aaron D.b; Greene, Stephen J.d,e; Fudim, Maratd,e; Coles, Adriane; Butler, Javedf; Sharma, Abhinavg; Hernandez, Adrian F.d,e; Mentz, Robert J.d,e

Journal of Cardiovascular Medicine: April 2019 - Volume 20 - Issue 4 - p 223–225
doi: 10.2459/JCM.0000000000000736
Research articles: Heart failure
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Background The IRONOUT-HF trial previously demonstrated that oral iron supplementation minimally increased iron stores and did not improve exercise capacity in patients with heart failure with a reduced ejection fraction (HFrEF) and iron deficiency.

Methods The IRONOUT-HF trial was a double-blind, placebo-controlled, randomized clinical trial designed to test the efficacy and safety of oral iron polysaccharide compared to matching placebo among patients with HFrEF and iron deficiency. Study participants received oral iron polysaccharide 150 mg twice daily or matching placebo for 16 weeks. Response to oral iron was defined as a ferritin level >300 ng/mL or a ferritin level 100-300 ng/mL with a transferrin saturation >20% at the end of the study.

Results The final analytical cohort included 98 patients with HFrEF and iron deficiency at baseline. Study participants had a median (25th, 75th) age of 63 years (54 years, 71 years), included 40% women (N = 39). After 16 weeks of therapy, 24 patients (24%) responded to oral iron supplementation while 74 patients (76%) remained iron deficient despite treatment. There was no association between response to oral iron supplementation and improvement in functional status (i.e. peak VO2 or anaerobic threshold), myocardial stress (i.e. NT-proBNP levels), or HRQOL (i.e. Kansas City Cardiomyopathy Questionnaire) at week 16.

Conclusion This study failed to identify a subset of responders more likely to derive a clinical benefit from oral iron therapy and does not support its routine use in patients with symptomatic HFrEF and iron deficiency.

aDivision of Cardiology, The Permanente Medical Group, San Francisco

bDivision of Research, Kaiser Permanente Northern California, Oakland, California

cDivision of Cardiology, Massachusetts General Hospital, Boston, Massachusetts

dDivision of Cardiology, Duke University Medical Center, Durham

eDuke Clinical Research Institute, Durham, North Carolina

fDepartment of Medicine, University of Mississippi Medical Center, Jackson, Mississippi

gDivision of Cardiology, Stanford Hospital and Clinics, Palo Alto, California, USA

Correspondence to Andrew P. Ambrosy, MD, Division of Cardiology, The Permanente Medical Group, 2238 Geary Boulevard, 8th Floor, San Francisco, CA 94114, USA E-mail: andrew.p.ambrosy@kp.org

Received 13 August, 2018

Accepted 24 October, 2018

© 2019 Italian Federation of Cardiology. All rights reserved.