Abstract
Background
The prevalence of iron deficiency (ID) in outpatients with heart failure with preserved ejection fraction (HFpEF) and its relation to exercise capacity and quality of life (QoL) is unknown.
Methods
190 symptomatic outpatients with HFpEF (LVEF 58 ± 7%; age 71 ± 9 years; NYHA 2.4 ± 0.5; BMI 31 ± 6 kg/m2) were enrolled as part of SICA-HF in Germany, England and Slovenia. ID was defined as ferritin < 100 or 100–299 µg/L with transferrin saturation (TSAT) < 20%. Anemia was defined as Hb < 13 g/dL in men, < 12 g/dL in women. Low ferritin-ID was defined as ferritin < 100 µg/L. Patients were divided into 3 groups according to E/e′ at echocardiography: E/e′ ≤ 8; E/e′ 9–14; E/e′ ≥ 15. All patients underwent echocardiography, cardiopulmonary exercise test (CPX), 6-min walk test (6-MWT), and QoL assessment using the EQ5D questionnaire.
Results
Overall, 111 patients (58.4%) showed ID with 89 having low ferritin-ID (46.84%). 78 (41.1%) patients had isolated ID without anemia and 54 patients showed anemia (28.4%). ID was more prevalent in patients with more severe diastolic dysfunction: E/e′ ≤ 8: 44.8% vs. E/e′: 9–14: 53.2% vs. E/e′ ≥ 15: 86.5% (p = 0.0004). Patients with ID performed worse during the 6MWT (420 ± 137 vs. 344 ± 124 m; p = 0.008) and had worse exercise time in CPX (645 ± 168 vs. 538 ± 178 s, p = 0.03). Patients with low ferritin-ID had lower QoL compared to those without ID (p = 0.03).
Conclusion
ID is a frequent co-morbidity in HFpEF and is associated with reduced exercise capacity and QoL. Its prevalence increases with increasing severity of diastolic dysfunction.
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Abbreviations
- ANOVA:
-
Analysis of variance
- ATP:
-
Adenosine triphosphate
- BMI:
-
Body mass index
- CPX:
-
Cardiopulmonary exercise test
- DEXA:
-
Dual energy X-ray absorptiometry
- HB:
-
Hemoglobin
- HF:
-
Heart failure
- HFpEF:
-
Heart failure with preserved ejection fraction
- HFrEF:
-
Heart failure with reduced ejection fraction
- ID:
-
Iron deficiency
- LAVI:
-
Left atrial volume index
- LV:
-
Left ventricular
- 6-MWT:
-
6-min walk test
- NYHA:
-
New York Heart Association
- QoL:
-
Quality of life
- SD:
-
Standard deviation
- SICA-HF:
-
Studies investigating co-morbidities aggravating heart failure
- TSAT:
-
Transferrin saturation
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Funding
The study was funded by the European Commission’s 7th Framework program (FP7/2007–2013) under grant agreement number 241558 (clinical.trial.gov).
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SvH is consulting and has received honoraria for speaking from Solartium Dietetics, Professional Dietetics, Vifor, Novartis, Respicardia, Sorin, and Pfizer. SDA is consulting, has received honoraria for speaking and/or attended advisory boards for Amgen Inc, Professional Dietetics, Psioxus Therapeutics, GTx, Helsinn, GSK, Sanofi, Regeneron, Novartis, Takeda, Servier, Chugai and Vifor. All other authors report no conflict of interest.
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Bekfani, T., Pellicori, P., Morris, D. et al. Iron deficiency in patients with heart failure with preserved ejection fraction and its association with reduced exercise capacity, muscle strength and quality of life. Clin Res Cardiol 108, 203–211 (2019). https://doi.org/10.1007/s00392-018-1344-x
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DOI: https://doi.org/10.1007/s00392-018-1344-x