Journal of Applied Physiology
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J Appl Physiol 56: 1423-1425, 1984;
8750-7587/84 $5.00
This Article
Right arrow Full Text (PDF)
Right arrow Submit a response
Right arrow Alert me when this article is cited
Right arrow Alert me when eLetters are posted
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Yeh, M. P.
Right arrow Articles by Yanowitz, F. G.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Yeh, M. P.
Right arrow Articles by Yanowitz, F. G.

Journal of Applied Physiology, Vol 56, Issue 5 1423-1425, Copyright © 1984 by American Physiological Society

ARTICLES

Effect of O2, N2, and CO2 composition on nonlinearity of Fleisch pneumotachograph characteristics

M. P. Yeh, T. D. Adams, R. M. Gardner and F. G. Yanowitz

Although the Fleisch pneumotachograph has many advantages, its flow-conductance characteristics are nonlinear and sensitive to changes in gas composition. The purpose of this study was to assess the effect of different O2, N2, and CO2 compositions on the nonlinearity of the Fleisch pneumotachograph flow-conductance characteristics, by use of a recently developed computerized calibration method. Hospital-grade O2 was mixed with room air to obtain seven gas mixtures (containing O2 percentages of 20.9, 28.3, 38.7, 52.8, 66.7, 78.7, and 99.6%). Within the accuracy of the applied method, the measured flow-conductance curves of the pneumotachograph had the same shape. Relative flow resistance of gas mixtures to room air was directly proportional to their O2 composition. Two O2-N2-CO2 mixtures were also tested. Their relative flow resistance compared with room air was proportional to the viscosity ratios. We concluded that the change in O2, N2, and CO2 composition does not affect the nonlinearity of the Fleisch pneumotachograph flow-conductance characteristics. However, the relative flow resistance compared with room air does change in a predictable way.


This article has been cited by other articles:


Home page
 Eur Respir JHome page
N. MacIntyre, R. O. Crapo, G. Viegi, D. C. Johnson, C. P. M. van der Grinten, V. Brusasco, F. Burgos, R. Casaburi, A. Coates, P. Enright, et al.
Standardisation of the single-breath determination of carbon monoxide uptake in the lung
Eur. Respir. J., October 1, 2005; 26(4): 720 - 735.
[Abstract] [Full Text] [PDF]

Home page
 ChestHome page
B. D. Johnson, I. M. Weisman, R. J. Zeballos, and K. C. Beck
Emerging Concepts in the Evaluation of Ventilatory Limitation During Exercise: The Exercise Tidal Flow-Volume Loop
Chest, August 1, 1999; 116(2): 488 - 503.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
B. Dutrieue, A.-M. Lauzon, S. Verbanck, A. R. Elliott, J. B. West, M. Paiva, and G. K. Prisk
Helium and sulfur hexafluoride bolus washin in short-term microgravity
J Appl Physiol, May 1, 1999; 86(5): 1594 - 1602.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
A.-M. Lauzon, G. K. Prisk, A. R. Elliott, S. Verbanck, M. Paiva, and J. B. West
Paradoxical helium and sulfur hexafluoride single-breath washouts in short-term vs. sustained microgravity
J Appl Physiol, March 1, 1997; 82(3): 859 - 865.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Visit Other APS Journals Online