Question 1 · Medium
During endotracheal suctioning of an adult, suction is applied only:
- ABefore the catheter enters the tube
- BWhile the catheter is being withdrawn
- CThroughout insertion and withdrawal
- DWhile the catheter is being inserted
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Answer: B · While the catheter is being withdrawn
The catheter is passed with the suction port open so that no negative pressure acts on the airway during insertion. Suction is applied intermittently while the catheter is rotated and withdrawn, for no more than 10-15 seconds. This removes secretions while limiting hypoxaemia and mucosal trauma. The patient is preoxygenated before each pass.
- A: Suction before entry clears nothing and wastes the oxygen reserve.
- C: Continuous suction prolongs oxygen removal and damages the tracheal lining.
- D: Suction during insertion pulls on the mucosa and removes oxygen without clearing secretions.