Compared with pressure-controlled inverse ratio ventilation, APRV ...

[savannahhooper]

Compared with pressure-controlled inverse ratio ventilation, APRV does which of the following?
 
  a. Decreases the cardiac index
  b. Reduces the need for sedation
  c. Increases the peak airway pressure
  d. Increases the central venous pressure

Question 2

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.

[momtoalll]

Answer to Question 1

ANS: B
Compared with pressure-controlled inverse ratio ventilation, APRV reduces peak and mean air-way pressures, increases cardiac index, decreases central venous pressure, increases urine output, increases oxygen delivery, and reduces the need for sedation and paralysis.

Answer to Question 2

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.