alveolar air equation

alveolar air equation

a mathematical expression relating the approximate alveolar oxygen tension to the arterial partial pressure of carbon dioxide (PaCO2), the fraction of inspired oxygen, and the ratio of carbon dioxide production to oxygen consumption.

al·ve·o·lar air e·qua·tion

(al-vē'ŏ-lăr ār ĕ-kwā'zhŭn)
An equation that calculates an approximation of alveolar oxygen tension if the fractional concentration of inspired oxygen, arterial carbon dioxide tension, and respiratory exchange ratio (i.e., carbon dioxide production divided by oxygen consumption) are known.
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References in periodicals archive ?
The alveolar air equation is needed to calculate the [CcO.
40, a significant amount of nitrogen molecules would wash out of the lungs, and the PAO2 would increase to about 225 mm Hg, based on the alveolar air equation.