Oxygenation Methods and Non-invasive Ventilation in Patients With Acute Respiratory Failure and a do Not Intubate Order

Observational prospective multicenter study Primary outcome: To analyze the efficacy and tolerance of NIV and HFNC in patients admitted to intensive care unit, or intermediate catre unit for acute respiratory insufficiency for whom a a do-not intubate order decision was taken upon admission or after extubation if the patient initially received mechanical ventilation. Secondary outcomes: To analyze the efficacy and tolerance of NIV and HFNC according to the following reason for ICU admission: chronic obstructive pneumopathy decompensated COPD, severe heart failure, evolutive cancer or hematologic malignancy; to analyze tolerance and acceptability of different techniques; to analyze the duration of the oxygenation methods use; to analyze the modalities of eventual withdrawing life support therapies and the associated sedative and opioid treatments; to analyze the satisfaction for the use of the non invasive technique by the relatives and the caregivers; to analyze mortality at D28 and D90 and quality of life at 3 and 6 months in surviving patients