Optimization of Positive End Expiratory Pressure by Use of Pulmonary Ultrasound for Patients With Blunt Chest Trauma Treated by Non-Invasive Ventilation (Opti-PEP).

This is an open-label, randomized controlled study comparing two non-invasive ventilation initiation strategies.Patients may be included if they present with acute respiratory failure related to blunt chest trauma.The intervention group will benefit from the use by the physiotherapist of pulmonary ultrasound for the adjustment of Positive End Expiratory Pressure (PEEP) during the 1st session. The conventional group will benefit from the non-invasive ventilation according to the current care.