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Canadian Journal of Anesthesia, Vol 33, 471-474, Copyright © 1986 by Canadian Anesthesiologists' Society

Arterial/Alveolar Oxygen Tension Ratio: A Critical Appraisal

D. JOHN DOYLE MD PHD1

1 Department of Anaesthesia and the Institute of Biomedical Engineering, University of Toronto, Toronto, Ontario, M5S 1A4

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 FIO2, particularly at high shunt levels.

Key Words: ARTERIAL/ALVEOLAR OXYGEN TENSION RATIO • a/APO2 • pulmonary shunt






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Copyright © 1986 by the Canadian Anesthesiologists' Society.