During the course of several patient-ventilator system checks a respiratory therapist notices that the patient's peak inspiratory pressure (PIP) is rising, while the plateau pressure (Pplateau) has re-mained the same
This most likely indicates which of the following?
a. Decrease in dynamic compliance
b. Increase in airway resistance
c. Decrease in static compliance
d. Increase in elastic recoil of alveolar walls
ANS: B
The difference between the peak inspiratory pressure (PIP) and plateau pressure (Pplateau) readings (PIP − Pplateau) is the transairway pressure (PTA). PTA is the amount of pressure required to over-come airway resistance (Raw) (Raw = PTA/Flow). Notice that PTA includes the resistance of the en-dotracheal tube (ET). A higher than expected difference between PIP and Pplateau suggests an in-creased Raw.
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