During mouth-to-mouth ventilation, what is the approximate alveolar Po2 that can be expected in the patient's lungs when the barometric pressure is 747 mm Hg and the patient's Paco2 is 40 mm Hg?
A. 32 to 39 mm Hg
B. 40 to 48 mm Hg
C. 52 to 76 mm Hg
D. 78 to 84 mm Hg
ANS: C
A. Incorrect response: See explanation C.
B. Incorrect response: See explanation C.
C. Correct response: During expired air resuscitation, the Fdo2 is approximately 16% to 18%, which results in an alveolar Po2 of approximately 52 to 76 mm Hg. This projected alveolar oxygenation tension is based on a barometric pressure of 747 mm Hg and an alveolar Pco2 of 40 mm Hg.
D. Incorrect response: See explanation C
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