For a successful weaning outcome, ____.
A. the PaO2 should be > 75 mm Hg
B. the P(A-a)O2 should be < 450 mm Hg while on 100% O2.
C. the PaO2/FIO2 should be 
150 mm Hg
D. the QS/QT should be < 45%
Answer: C
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