Info

minute

Vco

rate of carbon monoxide uptake per minute

Dlo2

diffusing capacity of the lungs for oxygen

Dlco

diffusing capacity of the lungs for carbon

monoxide monoxide

Pb atmospheric pressure

Palv alveolar pressure

Ppl pleural pressure

PO2 partial pressure of oxygen

PCO2 partial pressure of carbon dioxide

PN2 partial pressure of nitrogen

PaO2 partial pressure of oxygen in arterial blood

PaCO2 partial pressure of carbon dioxide in arterial blood

PAO2 partial pressure of oxygen in alveolar gas

PACO2 partial pressure of carbon dioxide in alveolar gas

PAH2O partial pressure of water in alveolar gas

R respiratory exchange ratio

Q cardiac output

CaO2 concentration of oxygen in arterial blood

Cv02 concentration of oxygen in mixed venous blood

SO2 percentage saturation of hemoglobin with oxygen

SaO2 percentage saturation of hemoglobin with oxygen in arterial blood where FRC is functional residual capacity, CiHe is initial concentration of helium in the spirometer, CfHe is final concentration of helium in the spirometer, and ViSpir is initial volume of the spirometer.

Once the FRC has been determined, the residual volume (RV) can be determined by subtracting expiratory reserve volume (ERV), as measured by normal spirometry, from the FRC. Also, the total lung capacity (TLC) can be determined by adding the inspiratory capacity (IC) to the FRC. That is,

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