Does Tracheal Suction During Extubation in Intensive Care Unit Decrease Functional Residual Capacity

Inclusion Criteria: * age of 18 years or more * hospitalization in the surgical ICU (whatever the cause of hospitalization) * under mechanical ventilation via a tracheal tube (oro or nasotracheal) for at least 24 hours * satisfying general criteria for mechanical ventilation weaning (described by the French Language Resuscitation Society) * having successfully completed a spontaneous breathing trial (among those described by the SRLF) * physiotherapist available during the first hour after extubation Exclusion Criteria: * the presence of an electrical implantable medical device (pacemaker, automatic defibrillator, deep brain stimulation box) * body mass index (BMI) \> 50 * pregnancy * tracheal tube with subglottic suction channel * technical impossibility of monitoring by electrical impedance tomography (chest plaster, undrained pneumothorax, ...).