Evaluation of Laryngeal Ultrasonography Performance in Predicting Major Post Extubation Laryngeal Edema in Intensive Care Patients

* For patient in intensive care unit, extubation failure is defined as the necessity of early reintubation after scheduled extubation, with Increased morbidity and mortality, so it seems important to quickly identify patients with high risk of post-extubation acute respiratory failure. * Major post-extubation laryngeal edema is one of extubation failure causes, and its incidence vary in literature from 4 to 37%. * We can't currently predict arising of a major post-extubation laryngeal edema. However, a recent pilot study showed that laryngeal ultrasonography could help to identify patients with high risk of post-extubation stridor, measuring ultrasonic leak volume and cuff-deflated air-column width, of which we propose to assess diagnostic performance.