| Influence of heart failure etiology on the prognostic value of peak oxygen consumption and minute ventilation/carbon dioxide production slope. | |
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MedLine Citation:
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PMID: 16236959 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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BACKGROUND: Peak oxygen consumption (V(O2)) and minute ventilation (V(E))/carbon dioxide production (V(CO2)) slope have been widely demonstrated to have strong prognostic value in patients with heart failure (HF). In the present study, we investigated the effect of HF etiology on the prognostic applications of peak V(O2) and Ve/V(CO2) slope. METHODS: Two hundred sixty-eight subjects underwent symptom-limited cardiopulmonary exercise testing (CPX). The population was divided into ischemic (115 men and 22 women) and nonischemic (108 men and 23 women) subgroups. The occurrence of cardiac-related events over the year following CPX was compared between groups using receiver operating characteristic curve (ROC) analysis RESULTS: Mean age +/- SD was significantly higher (61.0 +/- 10.0 years vs 50.3 +/- 16.2 years) while mean peak V(O2) was significantly lower (15.0 +/- 5.2 mL/kg/min vs 17.5 +/- 6.7 mL/kg/min) in the ischemic HF group (p < 0.05). ROC curve analysis demonstrated that both peak V(O2) and V(E)/V(CO2) slope were significant predictors of cardiac events in both the ischemic group (peak V(O2), 0.74; V(E)/V(CO2) slope, 0.76; p < 0.001) and the nonischemic group (peak V(O2), 0.75; V(E)/V(CO2) slope, 0.86; p < 0.001). Optimal prognostic threshold values for peak V(O2) were 14.1 mL/kg/min and 14.6 mL/kg/min in the ischemic and nonischemic groups, respectively. Optimal prognostic threshold values for the V(E)/V(CO2) slope were 34.2 and 34.5 in the ischemic and nonischemic groups, respectively. CONCLUSIONS: Baseline and exercise characteristics were different between ischemic and nonischemic patients with HF. However, the prognostic power of the major CPX variables was strikingly similar. Different prognostic classification schemes based on HF etiology may therefore not be necessary when analyzing CPX responses in clinical practice. |
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Authors:
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Ross Arena; Jonathan Myers; Joshua Abella; Mary Ann Peberdy |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Chest Volume: 128 ISSN: 0012-3692 ISO Abbreviation: Chest Publication Date: 2005 Oct |
Date Detail:
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Created Date: 2005-10-20 Completed Date: 2005-11-21 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 0231335 Medline TA: Chest Country: United States |
Other Details:
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Languages: eng Pagination: 2812-7 Citation Subset: AIM; IM |
Affiliation:
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Department of Physical Therapy, Box 980224, Virginia Commonwealth University, Medical College of Virginia, Health Sciences Campus, Richmond, VA 23298-0224, USA. raarena@.vcu.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Carbon Dioxide
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blood* Female Heart Failure / etiology* Humans Male Middle Aged Myocardial Ischemia / physiopathology* Oxygen Consumption* Prognosis ROC Curve Reference Values Respiratory Physiological Phenomena Ventricular Function, Left |
| Chemical | |
Reg. No./Substance:
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124-38-9/Carbon Dioxide |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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