Document Detail


Poor relationship between exercise capacity and spirometric measurements in patients with more symptomatic heart failure.
MedLine Citation:
PMID:  16230266     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: The origin of exercise limitation in patients with chronic heart failure (CHF) is multifactorial, and the relative contributions of different abnormalities may vary with severity of heart failure symptoms. The aim of the current study was to determine the extent to which spirometric indices predict peak exercise capacity in patients with differing severity of symptoms. METHODS AND RESULTS: A total of 340 patients with left ventricular systolic dysfunction underwent spirometry, and a ramped, maximal exercise treadmill test with metabolic gas exchange measurements. For comparative purposes, a group of 174 aged-matched controls with no major structural heart disease (MSHD) was also included. In a stepwise linear regression model, forced expiratory volume in 1 second (FEV1) and forced vital capacity (FVC) were independent predictors of peak oxygen uptake (pVO2) in controls (r2= 18-25%; P = .001) and New York Heart Association (NYHA) I-II patients (r2= 16-18%; P = .001). No association between spirometric indices (FEV1/FVC) and pVO2 (r2= 1-2%; P > .05) was found in NYHA III-IV patients. CONCLUSION: In aged-matched controls with no MSHD, spirometric variables (FEV1/FVC) explain 18% to 25% of the variance in pVO2, and 16% to 18% of the variance in patients with NYHA class I-II symptoms. As symptoms worsen, the influence of spirometric variables on peak exercise capacity diminishes, and there is no such relation in the NYHA class III-IV patients.
Authors:
Lee Ingle; Rhidian J Shelton; John G F Cleland; Andrew L Clark
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of cardiac failure     Volume:  11     ISSN:  1071-9164     ISO Abbreviation:  J. Card. Fail.     Publication Date:  2005 Oct 
Date Detail:
Created Date:  2005-10-18     Completed Date:  2006-05-22     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  9442138     Medline TA:  J Card Fail     Country:  United States    
Other Details:
Languages:  eng     Pagination:  619-23     Citation Subset:  IM    
Affiliation:
Department of Academic Cardiology, Castle Hill Hospital, Castle Road, Cottingham, Hull, United Kingdom.
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MeSH Terms
Descriptor/Qualifier:
Aged
Exercise Test
Exercise Tolerance*
Female
Forced Expiratory Volume
Heart Failure / physiopathology*
Heart Rate
Humans
Male
Middle Aged
Oxygen Consumption
Physical Endurance
Predictive Value of Tests
Severity of Illness Index
Spirometry*
Stroke Volume
Systole
Ventricular Dysfunction, Left / physiopathology
Vital Capacity

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


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