| Are oxygen uptake kinetics in chronic heart failure limited by oxygen delivery or oxygen utilization? | |
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MedLine Citation:
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PMID: 19168233 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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BACKGROUND: The delay in O(2) uptake kinetics during and after submaximal physical activity (O(2) onset and recovery kinetics, respectively) correlates well with the functional capacity of patients with chronic heart failure (CHF). This study examined the physiological background of this delay in moderately impaired CHF patients by comparing kinetics of cardiac output (Q) and O(2) uptake (V(O(2))). METHODS: Fourteen stable CHF patients (New York Heart Association class II-III) and 8 healthy subjects, matched for age and body mass index, were included. All subjects performed a submaximal constant-load exercise test to assess O(2) uptake kinetics. Furthermore, in 10 CHF patients Q was measured by a radial artery pulse contour analysis method, which enabled the simultaneous modelling of exercise-related kinetics of Q and V(O(2)). RESULTS: Both O(2) onset and recovery kinetics were delayed in the patient group. There were no significant differences between the time constants of Q and V(O(2)) during exercise-onset (62+/-25 s versus 59+/-28 s, p=0.51) or recovery (61+/-25 s versus 57+/-20 s, p=0.38) in the patient group, indicating that O(2) delivery was not in excess of the metabolic demands in these patients. CONCLUSION: The delay in O(2) onset and recovery kinetics in moderately impaired CHF patients is suggested to be due to limitations in O(2) delivery. Therefore, strategies aimed at improving exercise performance of these patients should focus more on improvements of O(2) delivery than on O(2) utilization. |
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Authors:
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Hareld M Kemps; Goof Schep; Maria L Zonderland; Eric J Thijssen; Wouter R De Vries; Bart Wessels; Pieter A Doevendans; Pieter F Wijn |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't Date: 2009-01-26 |
Journal Detail:
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Title: International journal of cardiology Volume: 142 ISSN: 1874-1754 ISO Abbreviation: Int. J. Cardiol. Publication Date: 2010 Jul |
Date Detail:
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Created Date: 2010-06-14 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8200291 Medline TA: Int J Cardiol Country: Netherlands |
Other Details:
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Languages: eng Pagination: 138-44 Citation Subset: IM |
Copyright Information:
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Copyright (c) 2008 Elsevier Ireland Ltd. All rights reserved. |
Affiliation:
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Department of Cardiology, Máxima Medical Centre, Veldhoven, The Netherlands. H.Kemps@wxs.nl |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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