A 70-year-old man recovering from hip replacement surgery developed fever, hypoxemia, and shortness of breath. After he was given 100% O2 for 30 minutes, his laboratory results were as follows: PaO2 = 90 mm Hg [HCO3−] = 22 mEq/L PaCO2 = 33 mm Hg [Hb] = 15 g% pH = 7.46 SaO2 = 95% The response to 100% O2 reveals that the patient has which of the following?
A
V/Q inequality with low V/Q units
B
Right-to-left shunting
C
Alveolar hypoventilation
D
Carbon monoxide poisoning
E
Diffusion impairment
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