Clinical Research Directory

Inclusion Criteria: All patients aged 18 years and older will be included in the study if they meet at least one of the following criteria : * Acute respiratory distress, defined as dyspnea respiratory rate ≥ 25 cycles/min * Hypoxemia, defined as the need for more 6 liters of oxygen to maintain an oxygen saturation (SpO2) of ≥ 92%. The fraction of inspired oxygen (FiO2) will be estimated using the 3% rule. Exclusion Criteria: Patients with any of the following criteria will not be included in the study: * Pregnant or breastfeeding women * Persons deprived of their liberty * Exacerbation of asthma, chronic obstructive pulmonary disease, or another chronic respiratory disease * Moderate to large amount of unilateral or bilateral undrained pleural effusion * Contraindication to CPAP: patient refusal, undrained pneumothorax, chest injury, repeated or large vomiting, upper gastrointestinal bleeding, craniofacial trauma, severe upper airway obstruction, or tetraplegia in the initial phase * Cardiac arrest, severe arrhythmias, shock requiring the use of vasopressors (norepinephrine, adrenaline, dopamine) * Altered level of consciousness (Glasgow Coma Scale score \< 13), repeated seizures, or status epilepticus * Medical decision to limit treatment: no intubation, no admission to intensive care * Refusal to participate in the study or participation in another interventional study on respiratory distress or acute respiratory failure.