Which describes the dual ventilator mode?

• A. Volume-targeted, Pressure-limited breaths
• B. Pressure-targeted breaths with pressure support
• C. Spontaneous breathing
• D. NAVA mode

Answer: (A)

Dual ventilator mode blends a target volume with a safety ceiling. It aims to deliver a preset tidal volume, but the inspiratory pressure is capped at a defined maximum to prevent high airway pressures. The ventilator increases pressure breath by breath to reach the volume target; if the pressure limit is reached, the delivered volume may be less, which is how it protects the lungs while still trying to guarantee a specific amount of air with each breath. This combination—volume guarantee plus pressure limitation—is what the description “volume-targeted, pressure-limited breaths” captures.

The other options describe different approaches: purely pressure-targeted breaths don’t guarantee a specific volume, spontaneous breathing relies on patient effort without a fixed target, and NAVA uses neural signals to control support rather than a fixed volume or pressure target.