Benefits of Optiflow® Device for Preoxygenation Before Intubation in Acute Hypoxemic Respiratory Failure : The PREOXYFLOW Study

Inclusion Criteria: * Adults older than 18 years regardless of the gender * Acute hypoxemic respiratory failure defined as : Respiratory rate \> 30/mn AND Hypoxemia with SpO2 \<90% with oxygen supply \> FiO2 0,5 AND PaO2/FiO2 \<300 mmHg Exclusion Criteria: * Contraindication to oro-tracheal intubation * Intubation without anesthetic delivery * Intubation during cardiac arrest * Asphyxia with immediate intubation needed * Nasopharyngeal obstacle with contraindication to use Optiflow device * Patients with a documented Cormack IV exposition before inclusion * Protected adult * Pregnancy * Lack of consent * Patient already enrolled in an other randomized study.