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39 - Combining flow and carbon dioxide

from 1 - Ventilation

Published online by Cambridge University Press:  05 August 2011

J. S. Gravenstein
Affiliation:
University of Florida
Michael B. Jaffe
Affiliation:
Philip Healthcare
Nikolaus Gravenstein
Affiliation:
University of Florida
David A. Paulus
Affiliation:
University of Florida
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Summary

The combination of flow and carbon dioxide (CO2) gas concentration makes possible the continuous assessment of CO2 production. The volume of carbon dioxide (VOCO2) and CO2 elimination is the net volume of CO2 measured at the mouth or airway, and is calculated as the difference between expired and inspired CO2 normalized to a minute. During steady-state conditions, the lung will excrete CO2 at the same rate as the total body production rate, and there will be no net change in body CO2 stores. Placement of the gas sampling site more proximally will potentially allow the end-tidal partial pressure of CO2 (PETCO2) value to better reflect the alveolar concentration. Clinically acceptable results for volumetric CO2 measurements may be achieved with all of the configurations reviewed under the right favorable conditions if close attention is paid to the measurement, the equipment set-up, and interpretation of the displayed results.
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Capnography , pp. 407 - 412
Publisher: Cambridge University Press
Print publication year: 2011

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