1. What is the air-to-oxygen entrainment ratio for
delivering 40% oxygen through an air entrainment mask?
a. 2 : 1
b. 1 : 2
c. 1 : 3
d. 3 : 1
2. Studies have shown that mustache and pendant cannulas can
reduce the cost of oxygen therapy by as much as:
3. What is the approximate partial pressure of inspired
oxygen of room air if the barometric pressure is raised to 2 atm?
a. 150 mm Hg
b. 300 mm Hg
c. 200 mm Hg
d. 1520 mm Hg
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