PRACTICE QUESTIONS
12/3/99


1. Blood gases in a sedated patient breathing room air at PB = 700mmHg were
PaCO2 = 46mmHg
Pa02 = 67mmHg
pHa = 7.33
At 37°C and with an assumed R = 0.90, what is the PAO2 in this patient?
a. 137 mmHg
b. 92 mmHg
c. 86 mmHg
d. 76 mmHg
e. 69 mmHg


  2.   A subject began breathing from her FRC for two minutes from a 9.0 L spirometer containing Helium (He) at an initial concentration of 0.0087. The resulting final FHe in the spirometer was then equal to 0.0065. What is her estimated FRC?
a. 3.05 L
b. 12.15 L
c. 6.72 L
d. 2.45 L
e. 4.55 L