The purpose of cuff in endotracheal tube is to:

Appeared in: BHU NO-2019

Explanation

The primary function of the cuff on an endotracheal tube is to inflate and create an airtight seal against the tracheal wall.
This seal is essential for delivering effective positive pressure ventilation by preventing air from leaking back around the tube.
The seal also protects the airway by blocking oral or gastric secretions from entering the lungs, which helps prevent aspiration pneumonia.

Option B: An over-inflated cuff is a significant cause of tracheal damage, including pressure necrosis and stenosis. The cuff itself does not prevent damage; improper use causes it.
Option C: A radiopaque line that runs the length of the endotracheal tube, not the cuff, is the feature designed to make its location visible on an X-ray.
Option D: The tube is prevented from dislocating by external fixation methods, such as adhesive tape or commercial endotracheal tube holders, which secure it to the patient's face.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Function of the Endotracheal Tube (ETT) Cuff as background academic context rather than a clinical decision trigger.
Proper cuff management is a critical nursing responsibility to balance the need for effective ventilation with the prevention of tracheal injury.
Regularly monitoring cuff pressure to keep it within the therapeutic range (typically 20-30 cm H₂O) is vital to prevent complications like tracheal necrosis (from over-inflation) or aspiration (from under-inflation).
What if? If a patient with an ETT suddenly develops an audible air leak and their ventilator alarms for low pressure, the nurse's first action should be to assess the cuff pressure and check for a leak in the pilot balloon system, as this could indicate cuff failure.

How to Approach the Question

This is a factual recall question about the function of a specific piece of medical equipment.
First, identify the key components mentioned in the question: the 'cuff' and the 'endotracheal tube'.
Recall the primary purpose of an inflatable cuff in a medical tube placed in an airway. Its function is to expand and fill the space.
Evaluate each option based on this function. Option A, 'Provide airtight seal', directly describes the result of inflating the cuff in the trachea.
Analyze the other options to confirm they are incorrect. Preventing damage, radiological location, and preventing dislocation are all important aspects of ETT care, but they are achieved by other features of the tube or other nursing procedures, not by the cuff's primary function.

Concept Tested & Keywords

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E6 Nursing Fundamentals Taylor pp. 734-736, 736-738

Practise the full BHU NO-2019

Attempt every question from this paper in a timed mock, then review the full solution for each one.