The static pressure-volume curve shown in the figure indicates the presence of which of the fol-lowing?
a. Atelectasis
b. Pneumonia
c. Pneumothorax
d. Bronchospasm
ANS: D
The static compliance (CS) line shown in the figure is normal. However, the dynamic compliance (CD) curve shows that with increasing volumes there are very high pressure increases. This shows a right shift and flattening of the CD curve and is indicative of increasing airway resistance. Bronchospasm causes an increase in airway resistance. Atelectasis, pneumonia, and pneumotho-rax will cause both the CS and CD curves to shift right and flatten.
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