What is the cause of the change from pressure-volume loop A to pressure-volume loop B during volume-controlled continuous mandatory ventilation (VC-CMV)?
a. Decreased compliance
b. Increased compliance
c. Decreased airway resistance
d. Increased airway resistance
ANS: A
The volume delivered remains the same for both the loops. However, the pressure has increased from approximately 20 to 35 cm H2O. The alveolar pressure (PA) has increased also. This is indic-ative of a decrease in compliance.
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