Airway pressure oscillation (Paw). Typical oscillatory Paw curve of the Oxylog 3000™ (solid line) in comparison with the Evita-4 NeoFlow™ (broken line). Settings: endotracheal tube internal diameter, 5 mm; biphasic intermittent positive airway pressure, 20/5 cmH2O; respiratory rate, 20/min; inspiration to expiration time ratio, 1:1; ramp, fast. The maximal amplitude of the pressure oscillation is the airway pressure amplitude (Paw-amplitude). Paw-overshoot, airway pressure overshoot.