Journal of Applied Physiology
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J Appl Physiol 47: 1118-1122, 1979;
8750-7587/79 $5.00
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Journal of Applied Physiology, Vol 47, Issue 5 1118-1122, Copyright © 1979 by American Physiological Society

ARTICLES

Incorporating the gas analyzer response time in gas exchange computations

R. R. Mitchell

A simple method for including the gas analyzer response time in the breath-by-breath computation of gas exchange rates is described. The method uses a difference equation form of a model for the gas analyzer in the computation of oxygen uptake and carbon dioxide production and avoids a numerical differentiation required to correct the gas fraction wave forms. The effect of not accounting for analyzer response time is shown to be a 20% underestimation in gas exchange rate. The present method accurately measures gas exchange rate, is relatively insensitive to measurement errors in the analyzer time constant, and does not significantly increase the computation time.


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A. D. Farmery and C. E. W. Hahn
Response-time enhancement of a clinical gas analyzer facilitates measurement of breath-by-breath gas exchange
J Appl Physiol, August 1, 2000; 89(2): 581 - 589.
[Abstract] [Full Text] [PDF]


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