EIT Assessment of Overdistension in ARDS Patients in Prone Position

Positive End-Expiratory Pressure (PEEP) will be titrated with PEEP-EIT method as it is already done in usual care. A classical low flow Pression Volume (PV) curve will be done in order to detect airway closure and measure compliance, the acquisition of EIT data during PV curve will be analysed secondary with a dedicated software. Reconstruction of EIT derived PV curve will determine the regional airway opening pressures and compliances of the 2 lungs. Two decremental PEEP-EIT titrations will be compared, one in supine and the other just after turning in prone.