Relationship of resting hemoglobin concentration to peak oxygen uptake in heart failure patients.

Anemia is frequent in chronic heart failure (HF). To calculate what change in peak oxygen uptake ( VO(2)) should be expected in the event of changes in hemoglobin concentration, we studied the correlation between peak VO(2) and hemoglobin concentration in a large HF population. We carried out retrospective analysis of all cardiopulmonary exercise tests (CPET) performed in our HF Clinic between June 2001 and March 2009 in HF patients who had a resting hemoglobin concentration measurement taken within 7 days of the CPET. We collected 967 CPETs, 704 tests were considered maximal and analyzed. We identified 181 patients (26%) as anemic. Peak VO(2) was lower (P < 0.001) in anemic patients (971 +/- 23 ml/min) compared with nonanemic (1243 +/- 18 ml/min). The slope of the VO(2) vs. hemoglobin ratio was 109 ml/min/g/dl at peak exercise. This correlation remained significant also when several confounding variables were analyzed by multivariate analysis. As an average, each gram of hemoglobin accounts, at peak exercise, for 109 ml/min change in VO(2) which is equivalent to 0.97 ml/min/kg. Therefore, in HF patients anemia treatment should increase VO(2) by 109 ml/min for each g/dl of hemoglobin increase. 2010 Wiley-Liss, Inc.

Citation

Piergiuseppe Agostoni, Elisabetta Salvioni, Chiara Debenedetti, Carlo Vignati, Gaia Cattadori, Mauro Contini, Damiano Magrì, Pietro Palermo, Erica Gondoni, Denise Brusoni, Cesare Fiorentini, Anna Apostolo. Relationship of resting hemoglobin concentration to peak oxygen uptake in heart failure patients. American journal of hematology. 2010 Jun;85(6):414-7

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PMID: 20513118

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