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.

Question

Quizplus · Accepted Answer

An increased P(A-a)O₂ indicates increased physiological shunting. The normal P(A-a)O₂ is approximately 7 to 14 mm Hg during breathing of room air and as high as 50 to 60 mm Hg during the breathing of 100% oxygen. These normal values increase with age as the lung becomes more inefficient. The variability of P(A-a)O₂ with FIO₂ limits its usefulness as a shunt indicator when FIO₂ is changed.

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

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