Which of the following conditions causes a pressure-volume loop during volume-controlled con-tinuous mandatory ventilation (VC-CMV) to extend farther to the right and flatten out?
a. Asthma
b. Bronchitis
c. Emphysema
d. Pneumonia
ANS: D
The extension to the right and flattening out of the pressure-volume loop during VC-CMV is in-dicative of decreasing compliance. This could be caused by pneumonia. Asthma, bronchitis, and emphysema all have increased airway obstruction.
Health Professions
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