High Flow Nasal Oxygen Therapy for Hypoxemy After Cardiac Surgery

High Flow Nasal Oxygen Therapy for Hypoxemy After Cardiac Surgery

The main objective of this study is to evaluate the gas exchange (ventilation-perfusion ratio) with the system Optiflow® compared to facial mask among patients having an acute respiratory failure after cardiac surgery.

Inclusion Criteria:

• Patient with indication of coronary artery bypass
• Absence of preoperative respiratory failure
• Hypoxia after extubation defined as SpO2 < 96% with Venturi mask 50% 8L/min
• Age > 18 years
• Signed informed consent

Exclusion Criteria:

• Patients requiring an imminent intubation, in coma or respiratory exhaustion, in a state of shock or severe rhythm disorders
• Hemodynamic instability, low flow rate
• Pneumothorax or hemothorax
• Bleeding major, ischemic signs
• Ventricular arrhythmia
• Respiratory failure
• Non controlled hyperalgia
• Alteration of mental status
• Cardiac surgery patients in post-operative valve surgery associated with coronary artery bypass surgery or isolated valve surgery
• Pregnancy
• Major under guardianship