Mechanical Vent Test 4 Practice

In APRV, how are the two pressure levels used and what is the goal?

Low baseline pressure with prolonged releases to maximize CO2 clearance. Constant pressure with spontaneous breaths; maximize tidal volume. High baseline pressure with brief releases to a lower pressure; improve oxygenation and reduce peak inspiratory pressure. High peak inspiratory pressure maintained; avoid alveolar recruitment.

Correct Answer:

High baseline pressure with brief releases to a lower pressure; improve oxygenation and reduce peak inspiratory pressure.

Explanation:

APRV works by keeping the lungs recruited most of the time with a high baseline pressure, then briefly releasing to a lower pressure to allow ventilation and CO2 removal. The goal is to improve oxygenation by maintaining open alveoli while lowering peak inspiratory pressure, which helps reduce the risk of lung injury. Those short, controlled releases let exhalation happen without letting the alveoli collapse, balancing recruitment with ventilation. In this pattern, the two pressure levels and their timing are chosen to maximize oxygenation and minimize injurious pressures, rather than maintaining a constant high pressure or allowing prolonged derecruitment.

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