Increased transairway pressure is associated with which two of the following changes? 1. Increased airway resistance 2. Decreased airway resistance 3. Increased static compliance 4. Decreased static compliance
a. 3 and 4 c. 2 and 4
b. 1 and 3 d. 1 and 2
ANS: B
Transairway pressure is the pressure required to overcome airflow resistance and is calculated by subtracting the plateau pressure from the peak inspiratory pressure. An increase in the peak in-spiratory pressure with a constant plateau pressure increases the transairway pressure. Another way to increase transairway pressure would be to decrease the plateau pressure (i.e., improved static compliance) and keep a constant peak inspiratory pressure.
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