Assessment of Airway Opening Pressure in Invasively Ventilated Children

Acute respiratory distress syndrome (ARDS) in children is associated with significant morbidity and mortality. Current studies seek to individualize the management of children by defining several phenotypes, based until now mainly on clinical presentation. A better understanding of the respiratory mechanics of each patient could allow the individualization of other phenotypes and adapt their management with individualized ventilation. The method for detecting airway opening pressure (AOP) in children has not yet been validated and the reference methods in adults are difficult to apply in children due to their physiological particularities. The main objective of the study is to evaluate the feasibility of two methods for measuring airway opening pressure in invasively ventilated pediatric patients: "pediatric slow flow method" based on a recent bench study and "fixed flow method" based on an adult study. The two methods will be separated by a wash out. The method will be considered feasible if at least one on three measures can be interpretated. Air flow will be recorded using a pneumotachograph connected to a T piece.