The acceptable lower limit of PaO2 for a mechanically ventilated patient with ARDS is which of the following?

a. 50 mm Hg
b. 60 mm Hg
c. 70 mm Hg
d. 80 mm Hg


ANS: B
The lower limits of permissive hypoxemia remain controversial. However, most clinicians agree that a target of PaO2 = 60 mm Hg and SpO2 = 90% are acceptable lower limits.

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