Alveolar Gas Equation - PAO2

Alveolar Gas Equation - PAO2



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Formula:

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


Normals:

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


About:

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


Reference:

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.