Which of the following are true about air-entrainment systems?
1. Their FiO2 values are directly proportional to their total flow.
2. They can provide variable FiO2 values under some clinical conditions.
3. They always deliver O2 concentrations less than 100%.
4. They yield a set FiO2 only if their flow exceeds the patient's.
a. 1 and 3 only
b. 1, 2, and 3 only
c. 3 and 4 only
d. 2, 3, and 4 only
ANS: D
The more air they entrain, the higher is the total output flow, but the lower is the delivered FiO2.
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