Prevalence of an Early Success of Non-invasive Ventilation in the Emergency Departement.

Non-invasive ventilation is a mechanical ventilation who provides ventilatory support through a facemask, and without the need for tracheal intubation. In the emergency department, non-invasive ventilation is commonly used for the management of acute respiratory failure related with acute exacerbation of chronic obstructive pulmonary disease or with cardiogenic pulmonary oedema. Non-invasive ventilation is associated with an improvement in the outcomes, such as a decreasing in the intubation rate and in the mortality rate. Non-invasive ventilation failure is defined by a requirement to tracheal intubation in a patient managed by non-invasive ventilation. In the intensive care unit, non-invasive ventilation failure is reported from 15 to 50% of patients according to the ARF aetiologies. Due to delayed intubation, non-invasive ventilation failure is associated with poor outcomes and an increasing in the mortality rate. Due to the emergency department's patients (older and/or not to be intubate patients) the actual definition of non-invasive ventilation failure could not be applied as non-invasive ventilation may have been stopped not because it was unsuccessful but because it was unsuccessful in a patient with a do not intubate decision. Consequently, the prevalence of the absence of non-invasive ventilation success in the emergency department is unclear, and its predictive factor are unknown. The aim is to measure the prevalence of the absence of non-invasive ventilation success in the emergency department. The secondary objective is to measure the association between an absence of non-invasive ventilation success and outcomes and to identify risk factor of an absence of non-invasive ventilation success in the emergency department. It's a prospective observationnal multicenter study in department of Initiative Recherche Urgences Study Groups from January 2024, 15th to January 2024, 20th. The Initiative Recherche Urgences is a research network set up on the initiati