When checking an O2 delivery system that incorporates a bubble humidifier running at 6 L/min, you occlude the delivery tubing, and the humidifier pressure relief immediately pops off. What does this indicate?
a. Malfunctioning humidifier
b. Normal, leak-free system
c. Malfunctioning flowmeter
d. Leak in the delivery tubing
ANS: B
If the system is obstructed at or near the patient interface and the pop-off sounds, the system is leak free.
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