Author Question: The pressure at which large numbers of alveoli become overinflated in a patient with acute ... (Read 18 times)

Yolanda · **on:** Jul 16, 2018

The pressure at which large numbers of alveoli become overinflated in a patient with acute res-piratory distress syndrome (ARDS) is located on the static pressure-volume curve at which of the following?

a. Upper inflection point
b. Lower inflection point
c. Peak inspiratory pressure
d. Between the lower and upper inflection points

Question 2

Which of the following indicates an increase in airway resistance in a patient receiving mechani-cal ventilation with a constant tidal volume?

a. Increased peak inspiratory pressure (PIP) and transairway pressure (PTA)
b. Increased static compliance
c. Increased plateau pressure (Pplateau) and stable PIP
d. Decreased dynamic compliance

cici · **Reply #1 on:** Jul 16, 2018

Answer to Question 1

ANS: A
The upper inflection point indicates a point at which large numbers of alveoli are becoming over-inflated.

Answer to Question 2

ANS: A
Airway resistance can be estimated for a ventilated patient using transairway pressure (PTA). When peak inspiratory pressure (PIP) increases and plateau pressure (Pplateau) remains relatively unchanged, there is an increase in PTA. An increased Pplateau and a stable PIP indicate a decrease in static compliance.