What is the maximum diameter of a suction catheter in relation to the internal diameter of an endotracheal tube?

• A. 1/4
• B. 2/3
• C. 3/4
• D. 1/2

Answer: (D)

The maximum diameter of a suction catheter in relation to the internal diameter of an endotracheal tube is typically recommended to be no greater than one-half of the internal diameter of the tube. This guideline is critical to ensure that there is enough space for ventilation and to allow adequate airflow through the tube while suctioning is performed. Using a suction catheter that exceeds this ratio could lead to significant airway obstruction, which can impair the patient’s ability to breathe and maintain adequate oxygenation.

In practice, maintaining this ratio also helps prevent trauma to the airway and minimizes complications during suctioning. The use of a suction catheter that is appropriately sized allows for effective clearance of secretions without compromising airflow. Therefore, ensuring that the diameter of the suction catheter does not exceed one-half of the internal diameter of the endotracheal tube is vital for patient safety and effective airway management.