An increasing PIP may indicate which of the following?
a. Decreasing lung compliance
b. Decreasing airway resistance
c. Leak in the ventilator circuit
d. Increasing dynamic compliance
ANS: A
Compliance is equal to tidal volume divided by peak inspiratory pressure (PIP). If the PIP is ris-ing, the compliance is decreasing. Therefore, the answer is "A." An increasing PIP would be caused by a rise in airway resistance and decreased dynamic compliance. A leak in the system would be indicated by a decreased PIP.
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