Which of the Following Statements Are True of P(A-A)O₂

question 24

Multiple Choice

Which of the following statements are true of P(A-a) O₂?
I.Increased P(A-a) O₂ indicates increased physiological shunting.
II.Normal P(A-a) O₂ is approximately 7 to 14 mm Hg during breathing of room air.
III.P(A-a) O₂ is as high as 50 to 60 mm Hg during the breathing of 100% oxygen.
IV.The variability of P(A-a) O₂ with FIO₂ limits its usefulness as a shunt indicator when FIO₂ is changed.

• A) I, II
• B) III, IV
• C) I, II, III, IV
• D) II, III

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