title: Arterial/alveolar oxygen tension ratio: a critical appraisal.
abstract: A critical analysis of the arterial/alveolar oxygen tension ratio (a/APO2) is presented by rearranging the terms of the pulmonary shunt equation. The influence of the shunt and inspired oxygen concentration on a/APO2 are illustrated. It is shown that, despite reports to the contrary, a/APO2 varies with F1O2, particularly at high shunt levels.
mesh_terms: D006801:Humans; D010100:Oxygen / Q000097:blood*; D011650:Pulmonary Alveoli / Q000032:analysis*; D011659:Pulmonary Gas Exchange
chemical_list: D010100:Oxygen