Assessment of Airway Opening Pressure in Invasively Ventilated Children

Inclusion Criteria: * Minor patients weighing more than 5 kg, hospitalized in the pediatric intensive care unit at Necker-Enfants Malades Hospital and receiving invasive ventilation. To assess patients with acute respiratory distress syndrome, the PALICC-2 criteria are used. * Holders of parental authority must be informed and consent to their child's participation in the study. * The patient must be passively ventilated to ensure reliable measurements. This means that the patient must not be spontaneously ventilating and must be completely passively ventilated by the ventilator (no respiratory effort during long-term inflation). Exclusion Criteria: * Respiratory mechanics preventing interpretation of maneuvers (flow too low and/or resistance too high) * Patient \< 5 kg * Refusal by those with parental authority * Patient not affiliated with social security * Patient receiving AME (Medical Aid for Life) * Contraindication or impossibility of performing static respiratory mechanics measurements: pneumothorax or pleural leak, head trauma or threatening HTIC, unstable patient with SpO2 \< 88%, patient receiving nitric oxide (NO) (circuit leaks) or other circuit leaks or patient leaks \> 20% displayed on the ventilator