A patient is admitted to the hospital because of hypoxemia. On ambient air the patient's PaO2 is 50 mm Hg with an oxygen saturation of 82%
While breathing 100% oxygen through a non-rebreathing mask, his PaO2 is 83 mm Hg with an oxygen saturation of 92%. The cause of this man's hypoxemia is most likely:
A. a physiological shunt
B. low
C. hypoventilation
D. decreased inspired oxygen
ANS: A
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