Which statement best describes Proportional Assist Ventilation (PAV) mode?

Which statement best describes Proportional Assist Ventilation (PAV) mode?

• A. It is proportional to patient effort and helps synchronize with the patient
• B. It requires complete sedation and paralysis
• C. Pressure, volume, and flow are proportional to the patient's spontaneous effort
• D. It ignores patient demand

Answer: (C)

Proportional Assist Ventilation works by giving support that scales with how hard the patient is trying to breathe. The ventilator estimates the patient’s inspiratory effort in real time and applies pressure in proportion to that effort, using a gain setting to determine how much of the work is shared. Because the pressure support tracks the patient’s effort, the resulting flow and tidal volume also follow the same demand. In other words, as the patient increases effort, the ventilator increases pressure output, which in turn increases flow and delivered volume in proportion to that effort. This keeps the breath more in line with the patient’s own pattern, improving synchronization and reducing the work of breathing. This approach is distinct from modes that require sedation or paralysis, or from fixed, non-responsive support. The idea that pressure, volume, and flow are all proportional to the patient’s spontaneous effort captures the essence of PAV’s responsive, demand-driven nature.

Proportional Assist Ventilation works by giving support that scales with how hard the patient is trying to breathe. The ventilator estimates the patient’s inspiratory effort in real time and applies pressure in proportion to that effort, using a gain setting to determine how much of the work is shared.

Because the pressure support tracks the patient’s effort, the resulting flow and tidal volume also follow the same demand. In other words, as the patient increases effort, the ventilator increases pressure output, which in turn increases flow and delivered volume in proportion to that effort. This keeps the breath more in line with the patient’s own pattern, improving synchronization and reducing the work of breathing.

This approach is distinct from modes that require sedation or paralysis, or from fixed, non-responsive support. The idea that pressure, volume, and flow are all proportional to the patient’s spontaneous effort captures the essence of PAV’s responsive, demand-driven nature.