A pediatric patient intubated with a 3.5-mm endotracheal tube is receiving pressure support ventilation.The respiratory therapist notes patient-ventilator asynchrony and a rapid deceleration of flow that prematurely ends inspiration.The most appropriate action to alleviate this is which of the following?

Question

Quizplus · Accepted Answer

ET tubes smaller than 4.5 mm may provide excessive resistance during PS.This can cause pressurization of the ventilator circuit before sufficient flow enters the patient's airway.The result is a rapid deceleration of flow,which may prematurely end the inspiratory phase (premature pressure support termination [PPST]).This phenomenon does not allow the augmentation of Vᴛ,and patient-ventilator asynchrony may result.When PPST is suspected,a slower rise time can be used,which may reduce or eliminate the problem.

A Pediatric Patient Intubated with a 3