In PRVC/APV-CMV, which parameter is actively targeted by the ventilator to reach the set tidal volume?

• A. Respiratory Rate
• B. PEEP
• C. FiO2
• D. Target Tidal Volume

Answer: (D)

In PRVC/APV-CMV the ventilator uses a feedback loop to deliver a specific tidal volume. It continuously adjusts the inspiratory pressure breath by breath to reach the set volume. If the delivered volume is too low, the machine increases the pressure for the next breath; if it’s too high, it reduces the pressure. This breath-to-breath optimization happens within safe pressure limits to maintain the target tidal volume.

Other settings like respiratory rate only determine how often breaths occur, not how much air is delivered in each breath. PEEP mainly affects alveolar recruitment and end-expiratory pressure, influencing oxygenation rather than the delivered VT. FiO2 adjusts the oxygen content, not the volume per breath.