Suction Catheter Size for Endotracheal Tube (TMC Practice Question)

This video breaks down a sample TMC Practice Question about the suction catheter size for an endotracheal tube.
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➡️ Question:
A 63-year-old female patient is orally intubated with a size 7 endotracheal tube and is receiving ventilatory support. While attempting to suction the patient with a size 12 Fr catheter, you note that it cannot pass beyond the tip of the tube. Which of the following is the most likely cause of this problem?
A. There is a kink in the tube
B. The tube is in the right mainstem bronchus
C. The suction catheter too short
D. The suction catheter size is too large

➡️ Explanation:
After reading the question and answer choices, first, we must determine if the right size suction catheter is being used. A quick and simple way to do so is to: Double the ET tube size and then take the next size down.

➡️ For example:
The question tells us that the patient has a size 7 endotracheal tube. So now, we can double that number to get 14. Then we need to take the next smallest catheter size, which would be size 12. This confirms that a size 12 Fr catheter is the appropriate size for a size 7 endotracheal tube. So now, looking back at the answer choices, this means that we can rule out C and D automatically. In general, whenever you are unable to pass a suction catheter down the ET tube, it usually indicates that there is some type of obstruction. And the most common types include mucus plugs, kinking, or when the patient is biting the tube. Even if the tube is in the right mainstem bronchus, you should still be able to pass the suction catheter beyond the tip of the tube.
 
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🚑MEDICAL DISCLAIMER
This content is for educational and informational purposes only. It is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Please consult with a physician with any questions that you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you watch in this video. We strive for 100% accuracy, but errors may occur, and medications, protocols, and treatment methods may change over time.

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⏰TIMESTAMPS
0:00 - Intro
0:38 - Practice Question
1:18 - Explanation
2:25 - Example
2:35 - Correct Answer

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