What is the highest PAO2 one could expect to observe in an individual breathing room air at sea level?
a. 90 to 100 mm Hg
b. 110 to 120 mm Hg
c. 640 to 670 mm Hg
d. 710 to 760 mm Hg
ANS: B
Neural control mechanisms and the increased of work breathing prevent decreases in PACO2 much below 15 to 20 mm Hg. Thus, whenever a patient is breathing room air at sea level, the res-piratory therapist should not expect to see a PaO2 any higher than 120 mm Hg during hyperven-tilation.
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