Abstract
Conclusions
A method for obtaining an accurate mixed sample of the total inspired air is described. Provision is made for control of the size of the sample and the rate of sampling so that they conform to the inspired air of the subject.
The CO2 percentage of the inspired air in a mask is more reliably obtained through this method than through alveolar CO2 samples, since the volume of ventilation tends to keep the CO2 tension constant. Alveolar samples taken at low barometric pressures, such as 140 mm Hg, are compressed to such a small volume at sea level that analysis may be difficult. Such difficulty is not experienced when taking large inspired air samples for analysis.
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