The advantage of APRV over VC-CMV or PC-CMV is which of the following?
a. It enhances CO2 elimination.
b. Volume delivery is consistent.
c. Independent lung regions are better venti-lated.
d. It reduces the risk of ventilator-induced lung injury.
ANS: D
APRV can reduce airway pressure in patients with ALI/ARDS; it therefore is also thought to reduce the risk of ventilator-induced lung injury. In APRV, the volume delivery varies, depend-ing on lung compliance, airway resistance, and the patient's spontaneous effort. APRV helps ventilate the dependent regions of the lungs, which are better perfused, improving the patient's ventilation/perfusion matching. CO2 elimination is not completely supported by APRV and relies more on the patient's spontaneous breathing.
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