Alveolar Gas Equation - PAO2

Alveolar Gas Equation - PAO2

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Alveolar Gas Equation: PAO2 = ( FiO2 * (Patm – PH2O)) – (PaCO2 / RQ).


Mild hypoxemia: PAO2 equals 60-79 Moderate Hypoxemia: PAO2 equals 40-59 Severe Hypoxemia: PAO2 less than 40


Alveolar Gas Equation is used to calculate the partial pressure of oxygen in the alveoli. PAO2: Alveolar partial pressure of oxygen in mmHg. Patm: Barometric pressure in mmHg. PH2O: Water vapour pressure, 47 mmHg saturated at 37C. FiO2: Inspired oxygen in percent. PaCO2: Arterial Carbon Dioxide tension in mmHg. RQ: Respiratroy exchange ratio.

How to Calcualte Alveolar Gas Equation


Berg, Katherine M., MD, Gerald R. Lang, RRT, Justin D. Salciccioli, Eske Bak, Michael N. Cocchi, MD, and Shiva Gautam, PhD. The Rapid Shallow Breathing Index as a Predictor of Failure of Noninvasive Ventilation for Patients With Acute Respiratory Failure. Respiratory Care. N.p., 1 Oct. 2012. Web. 20 May 2016.