An increase in airway resistance during volume-controlled ventilation will have which of the fol-lowing effects?
a. Volume increase
b. Flow decrease
c. Pressure increase
d. Rate decrease
ANS: C
When a ventilator is volume-controlled the ventilator will maintain the volume, which will remain unchanged, along with the flow, but the pressure will vary with changes in lung characteristics. An increase in airway pressure will require more pressure to deliver the set volume. The set rate is independent of the changes in pressure.
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