Document Detail

Validating facemask use for gas exchange analysis in patients with congestive heart failure.
MedLine Citation:
PMID:  11314290     Owner:  NLM     Status:  MEDLINE    
PURPOSE: Functional limitation, often associated with congestive heart failure (CHF), is most accurately assessed with measurement of peak VO2 (VO2peak) during exercise testing. VO2peak strongly predicts survival in CHF patients and is used to triage patients for cardiac transplantation. However, the traditional mouthpiece/noseclip equipment used for gas exchange analysis is often cumbersome and uncomfortable. Several alternative facemask designs tested previously in healthy cohorts were inferior to the mouthpiece for measuring VO2peak. In this study, a series of facemasks designed specifically for VO2peak testing (Hans-Rudolph) was employed. Although previously validated in healthy young adults, this apparatus has not been validated in patients with severe CHF. METHODS: The Hans-Rudolph facemasks were compared with the mouthpiece apparatus in 30 patients with severe CHF. Each subject completed a cardiopulmonary exercise test with each device. Twelve subjects were randomized to evaluate a possible training effect. To enhance recruitment, 18 additional subjects were recruited after they had completed a test with the mouthpiece. RESULTS: There was no evidence of a training effect and no differences in gas exchange measurements were found between the two devices. The weight-adjusted VO2peak measurements were 17.1 +/- 5.3 ml O2/kg/min for the mouthpiece group and 17.3 +/- 5.6 ml O2/kg/min for the mask group (P = 0.54). CONCLUSIONS: The facemask was shown to be equivalent to the mouthpiece for measuring VO2peak in CHF patients. Concerns of hypoventilation and decreased VO2peak associated with previous facemask designs were not substantiated. Since successful exercise testing depends on maximal exertion, providing a choice of equipment may facilitate cooperation without sacrificing accuracy.
D A Baran; E Rosenwinkel; D K Spierer; J Lisker; J Whelan; M Rosa; R L Goldsmith
Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial; Validation Studies    
Journal Detail:
Title:  Journal of cardiopulmonary rehabilitation     Volume:  21     ISSN:  0883-9212     ISO Abbreviation:  J Cardiopulm Rehabil     Publication Date:    2001 Mar-Apr
Date Detail:
Created Date:  2001-04-20     Completed Date:  2001-09-13     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  8511296     Medline TA:  J Cardiopulm Rehabil     Country:  United States    
Other Details:
Languages:  eng     Pagination:  94-100     Citation Subset:  IM    
Mt. Sinai Medical Center, Department of Medicine, Division of Cardiology, 1 Gustave L. Levy Place, Box 1030, New York, NY 10029, USA.
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MeSH Terms
Controlled Clinical Trials as Topic
Cross-Over Studies
Equipment Design
Exercise Test*
Heart Failure / physiopathology*
Middle Aged
Oxygen Consumption / physiology*
Pulmonary Gas Exchange*

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

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