Bubble Humidifier Making a Whistling Noise? (TMC Practice Question)

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The video breaks down a sample TMC practice question about a bubble humidifier that is making a whistling noise. What is the primary cause?
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➡️ Question
During the assessment of a 52-year-old female patient who is receiving oxygen via nasal cannula at 4 L/min, you hear the bubble humidifier making a whistling noise. What is the most likely cause of this finding?
A. There is an obstruction in the delivery tube
B. The patient’s ventilation has increased
C. There is a clogged system diffuser
D. The flowmeter pressure is set too high

If you’ve ever accidentally stepped on the tubing of a bubble humidifier while being used, you will automatically recognize that the correct answer is A. The relief valve of a bubble humidifier was designed to sound whenever the pressure in the reservoir container exceeds the valve’s threshold pressure, resulting in a loud, whistling noise. And, of course, the most common reason for this to occur is when there is a downstream obstruction to outflow.

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⏰TIMESTAMPS
0:00 - Intro
0:23 - Practice Question
0:55 - Explanation
1:25 - Correct Answer

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