Document Detail


Hemodynamic basis of the reduced oxygen uptake relative to work rate during incremental exercise in patients with chronic heart failure.
MedLine Citation:
PMID:  11959385     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: The ratio of the increase in oxygen uptake to the increase in work rate (DeltaVO2/DeltaWR) during incremental exercise is reduced in patients with severe chronic heart failure (CHF). However, the pathophysiological basis of the reduced O2 uptake relative to work rate has not been elucidated. METHODS: To elucidate the hemodynamic basis of the reduced ratio of DeltaVO2/DeltaWR during exercise in severe CHF, 48 patients with CHF (15 patients in class I, 21 in class II and 12 in class III) performed maximal ergometer exercise with respiratory gas analysis. Cardiac output and systemic O2 extraction were measured at 1-min intervals during exercise. RESULTS: Both peak VO2 and peak cardiac output decreased as the severity of CHF advanced. Patients in class III showed significantly reduced DeltaVO2/DeltaWR than those in class I (8.2+/-0.9 vs. 9.8+/-1.5 ml/min/W, P<0.01). Cardiac output at rest was significantly lower, and O2 extraction at rest was significantly higher in class III than class I. The ratio of the increase in cardiac output to the increase in work rate (DeltaCO/DeltaWR) was significantly lower in class III than class I (42.5+/-14.5 vs. 60.6+/-10.3 ml/min/W), and the ratio of the increase in O2 extraction to the increase in work rate (DeltaO2 extraction/DeltaWR) was significantly higher in class III than class I (0.45+/-0.13 vs. 0.34+/-0.08%/W). The DeltaVO2/DeltaWR was significantly correlated with the DeltaCO/DeltaWR (r=0.67, P<0.01), and the DeltaCO/DeltaWR was inversely correlated with DeltaO2 extraction/DeltaWR (r=-0.65, P<0.01). CONCLUSIONS: Decreased O2 supply due to reduced cardiac output was not fully compensated by the increased O2 extraction. Reduced ratio of DeltaVO2/DeltaWR in advanced CHF reflected the severely attenuated cardiac output response to exercise.
Authors:
Yasuhiko Tanabe; Iwao Nakagawa; Eiichi Ito; Kaoru Suzuki
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  International journal of cardiology     Volume:  83     ISSN:  0167-5273     ISO Abbreviation:  Int. J. Cardiol.     Publication Date:  2002 Apr 
Date Detail:
Created Date:  2002-04-17     Completed Date:  2002-06-28     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  8200291     Medline TA:  Int J Cardiol     Country:  Ireland    
Other Details:
Languages:  eng     Pagination:  57-62     Citation Subset:  IM    
Affiliation:
Department of Cardiology, Niigata Prefectural Shibata Hospital, Ohte-machi 4-5-48, Shibata City, Niigata 957-8588, Japan.
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MeSH Terms
Descriptor/Qualifier:
Adult
Cardiac Output / physiology
Chronic Disease
Exercise / physiology*
Exercise Test
Female
Heart Failure / blood,  physiopathology*
Hemodynamics / physiology*
Humans
Male
Middle Aged
Oxygen / blood
Oxygen Consumption / physiology*
Severity of Illness Index
Statistics as Topic
Chemical
Reg. No./Substance:
7782-44-7/Oxygen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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