Topic

Question 1: Which of the following statements is conclusive of the diagnosis of a right-to-left pulmonary shunt?

PO2 should increase dramatically (>600 Torr) when 100% O2 is administered.

PO2 should rise to a level between 150 and 600 Torr when 100% O2 is administered.

There should be no change in PO2 when 100% O2 is administered.

The shunt fraction can only be measured if PO2 rises to >600 Torr when 100% O2 is administered.

Question 2: Lung fields have traditionally been classified into physiologic zones. Which of the following statements most accurately describes the pressures in Zone 2 (middle lung fields) under normal conditions?

Question 3: Which of the follwing is an appropriate P(A-a)O2 range for a healthy 40 year old man?

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