Comparison of gas exchange measurements with a mouthpiece, face mask, and ventilated canopy.
This study compared gas exchange measurements obtained by using a mask, mouthpiece, and ventilated canopy in 30 normal, healthy volunteers. The ventilated canopy and its gas analyzers had an accuracy for oxygen consumption of 98.0 +/- 0.8% and for carbon dioxide production of 100.1 +/- 1.1%. The study indicates that the apparatus used for gas exchange measurement will significantly affect the measurements. The magnitude of the effect is a significant 7.9% increase for oxygen consumption with a mouthpiece and a significant 7.1% increase with a face mask. Carbon dioxide production was significantly increased 10.2% with a mouthpiece and 4.1% with a face mask. There were no differences in the respiratory quotient. The specific purpose for collecting gas exchange measurements will determine whether these differences are of practical significance.
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Department of Surgery, Royal Victoria Hospital, McGill University, Montreal, Canada.
D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008397:Masks; D011659:Pulmonary Gas Exchange; D014691:Ventilation / Q000295:instrumentation*