| Hemodynamic basis of the reduced oxygen uptake relative to work rate during incremental exercise in patients with chronic heart failure. | |
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MedLine Citation:
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PMID: 11959385 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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Yasuhiko Tanabe; Iwao Nakagawa; Eiichi Ito; Kaoru Suzuki |
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Publication Detail:
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Type: Comparative Study; Journal Article |
Journal Detail:
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Title: International journal of cardiology Volume: 83 ISSN: 0167-5273 ISO Abbreviation: Int. J. Cardiol. Publication Date: 2002 Apr |
Date Detail:
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Created Date: 2002-04-17 Completed Date: 2002-06-28 Revised Date: 2007-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8200291 Medline TA: Int J Cardiol Country: Ireland |
Other Details:
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Languages: eng Pagination: 57-62 Citation Subset: IM |
Affiliation:
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Department of Cardiology, Niigata Prefectural Shibata Hospital, Ohte-machi 4-5-48, Shibata City, Niigata 957-8588, Japan. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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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:
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7782-44-7/Oxygen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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