High-flow Nasal Oxygenation During Preoxygenation and Atelectasis

The Effect of High-flow Nasal Cannula Applied During Preoxygenation for Prevention of Atelectasis in Patients With Obesity Undergoing General Anesthesia: A Randomized Controlled Trial

Atelectasis after induction of general anesthesia is common even in healthy patients and is clinically problematic, especially in obese patients. We aim to investigate whether preoxygenation with high-flow nasal oxygen during anesthesia induction reduces atelectasis in obese patients.

Inclusion Criteria:

• Adults patients undergoinig surgery under general anesthesia with a BMI of 30 kg/m2 or greater who have given informed consent

Exclusion Criteria:

• surgery time less than 2 hours
• Nasotracheal intubation
• Severe cardiac or respiratory disease
• History of difficult airway
• History of a surgery or anatomical anomaly in the head and neck
• History of Inability to breathe through nose
• Gastric reflux disease