Multiple Choice
If Hb and cardiac output are normal, PaO2 must acutely decrease to which of the following levels before clinical manifestations appear?
A) 71 to 80 mm Hg
B) 61 to 70 mm Hg
C) 50 to 60 mm Hg
D) 40 to 49 mm Hg
Correct Answer:

Verified
Correct Answer:
Verified
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