Ace the 2026 Neonatal Nurse Practitioner NCC Exam – Nurture Your Knowledge and Shine Bright!

In HFOV, the amount of gas moved with each oscillation, i.e., the tidal volume, is determined by how big the pressure swing is. That swing is the amplitude of the oscillation—the pressure amplitude. When you increase the amplitude, the lungs experience a larger pressure difference during each cycle, delivering a bigger tidal volume. When you decrease the amplitude, the tidal volume drops.

The other settings influence oxygen and overall ventilatory context but don’t directly set the tidal volume. Mean airway pressure (MAP) establishes the baseline pressure and largely affects lung recruitment and oxygenation. FiO2 controls the oxygen concentration delivered. Frequency changes how many oscillations occur per second and influences CO2 clearance, but it does not directly set the amount of air moved per beat.