Prediction of mortality in chronic heart failure from peak oxygen consumption adjusted for either body weight or lean tissue

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Item Type:	Article
Title:	Prediction of mortality in chronic heart failure from peak oxygen consumption adjusted for either body weight or lean tissue
Creators Name:	Cicoira, M., Davos, C.H., Francis, D.P., Doehner, W., Zanolla, L., Franceschini, L., Piepoli, M.F., Coats, A.J., Zardini, P., Poole-Wilson, P.A. and Anker, S.D.
Abstract:	Background: Peak oxygen consumption (pVO2) reflects oxygen extraction from the skeletal muscles, but is routinely corrected for body weight. We hypothesized that correcting pVO2 for lean tissue rather than total body weight would improve the prediction of prognosis in patients with chronic heart failure (CHF). Methods and Results: A total of 272 CHF outpatients (mean age 61 ± 12 years, New York Heart Association [NYHA] class 2.3 ± 0.8) underwent a cardiopulmonary exercise testing and body composition assessment by dual-energy X-ray absorptiometry. During a median follow-up of 608 days (range 8-3656), 75 patients died. Univariate survival analysis showed strong survival prediction from pVO2 adjusted for total weight or lean tissue (χ2 17.7, P < .001; χ2 27.5, P < .0001, respectively). Both predicted survival significantly in bivariate analysis, (χ2 4.6, P = .032; χ2 16.6, P < .0001). The predictive effects were independent of exercise protocol (treadmill versus cycle ergometer) (both P < .001). Multivariate analysis showed that pVO2 adjusted for lean tissue had prognostic importance independently of NYHA class, ejection fraction, and ventilation and carbon dioxide production slope (P < .05 for each). In patients with NYHA class I and II (n = 160), pVO2 adjusted for lean tissue predicted outcome (P = .03). Conclusion: Adjustment for lean tissue instead for body weight increases the prognostic power of pVO2, particularly in patients with mild heart failure.
Keywords:	Exercise Tolerance, Heart Failure, Prognosis, Skeletal Muscle
Source:	Journal of Cardiac Failure
ISSN:	1071-9164
Publisher:	Churchill Livingstone Innc Medical Publishers
Volume:	10
Number:	5
Page Range:	421-426
Date:	1 October 2004
Official Publication:	https://doi.org/10.1016/j.cardfail.2003.12.009
PubMed:	View item in PubMed

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