Optiflow in Sequential Non-Invasive Ventilation

Exclusion Criteria

• •Existence of criteria for intubation.
• •Refusal to participate in the study.
• •Pregnancy
• •Patient under guardianship or trusteeship
• •Patients for whom a decision of non intubation has been decided.
• •Patients who have received one or several NIV session for ARDS before hospital admission
• •Home noninvasive ventilation
• •Tracheostomy
• •Hemodynamic instability
• •Hypercapnia (PaCO2\>45 mm Hg).
• •left ventricular failure (cardiogenic pulmonary acute edema).
• •Ineffective coughing.
• •Recent gastric or oesophageal surgery
• •Severe ventricular rhythm disorder
• •High digestive haemorrhage
• •Lack of collaboration
• •Pernicious vomiting
• •Upper airway obstruction
• •Severe sepsis.
• •Undrained pneumothorax.