Certified Respiratory Therapist Exam 2025 – 400 Free Practice Questions to Pass the Exam

When suctioning through an endotracheal (ET) tube, encountering resistance can indicate that the catheter being used is either too large for the tube or that there may be blockage or secretions within the airway. The choice of using a 10-Fr catheter is appropriate because it provides a better fit within a size 6-mm ID ET tube, striking a balance between effective suctioning and minimizing trauma or irritation to the airway.

Using a catheter that is smaller in diameter can reduce the likelihood of causing airway obstruction or increasing the work of breathing, while still allowing for effective clearance of secretions. A 10-Fr catheter, being smaller than a 14-Fr, will offer less resistance in the narrow confines of a 6-mm ID tube while still adequately performing suctioning tasks.

When managing a patient's airway, it's also crucial to consider the patient's comfort, safety, and the goal of maintaining as clear an airway as possible. Therefore, the choice of moving to a smaller catheter helps facilitate these objectives effectively.