Is the elevated slope relating ventilation to carbon dioxide production in chronic heart failure a consequence of slow metabolic gas kinetics?
Open Access
- 1 August 2002
- journal article
- research article
- Published by Wiley in European Journal of Heart Failure
- Vol. 4 (4), 469-472
- https://doi.org/10.1016/s1388-9842(02)00093-4
Abstract
Objective Patients with heart failure have slow metabolic gas exchange kinetics, which may contribute to the elevated slope of the relationship between ventilation and carbon dioxide production (Ve/Vco2 slope). Setting A tertiary referral centre for cardiology. Subjects Eleven patients with stable chronic heart failure and 11 age‐matched controls. Design Each subject underwent maximal bicycle‐based peak exercise testing with metabolic gas exchange analysis and three further repeated tests at 15%, 25% and 50% of the load achieved at peak exercise. The ventilation and carbon dioxide production from each of these steady‐state tests was used to re‐calculate the Ve/Vco2 slope and compared with the Ve/Vco2 slope derived from the maximal test. Results Peak oxygen consumption [mean (S.D.)] was lower in heart failure patients [18.2 (4.0) vs. 31.2 (6.3) ml/kg per min; PVe/Vco2 slope was steeper in patients than controls [32.7 (8.3) vs. 27.1 (1.6); PVe/Vco2 slope reconstructed from the three steady state tests and resting data and that gained from the maximal test [35.3 (7.8) vs. 25.9 (3.2); P‐0.43]. Conclusions The elevated slope of the relationship between ventilation and carbon dioxide production is not a consequence of the short stages of a standard incremental exercise test combined with delayed metabolic gas kinetics in heart failure patients.Keywords
This publication has 20 references indexed in Scilit:
- Contribution of skeletal muscle ‘ergoreceptors’ in the human leg to respiratory control in chronic heart failureThe Journal of Physiology, 2000
- Chronic heart failure in the elderly: value of cardiopulmonary exercise testing in risk stratificationHeart, 2000
- Cardiopulmonary exercise testing for prognosis in chronic heart failure: continuous and independent prognostic value from VE/VCO2slope and peak VO2European Heart Journal, 2000
- Exercise limitation in chronic heart failure: Central role of the peripheryJournal of the American College of Cardiology, 1996
- Anatomical dead space, ventilatory pattern, and exercise capacity in chronic heart failure.Heart, 1995
- Gas exchange responses to constant work rate exercise in chronic cardiac failure.Heart, 1994
- Usefulness of arterial blood gas estimations during exercise in patients with chronic heart failure.Heart, 1994
- A critical threshold of exercise capacity in the ventilatory response to exercise in heart failure.Heart, 1991
- Mechanism of the increased ventilatory response to exercise in patients with chronic heart failure.Heart, 1990
- Arterial oxygenation and arterial oxygen transport in chronic myocardial failure at rest, during exercise and after hydralazine treatment.Circulation, 1982