Using a protective ventilation strategy during general anesthesia from pre-oxygenation to emergence and selecting patients without risk of a difficult airway or intubation, a lower fraction of inspiratory oxygen (FIO2) can be used during extubation. This might reduce the postoperative area of atelectasis without desaturations becoming more common.

Inclusion Criteria:

• No sign of difficult airway or intubation
• Day case surgery in total intravenous anesthesia with laryngeal mask airway without adding regional anesthesia of plexus brachialis or muscle relaxant.
• Body mass index less than 35.
• American Society of Anesthesiologists physical status (ASA) class I-III

Exclusion Criteria:

• Body mass index 35 or higher
• Increased risk of aspiration
• Obstructive sleep apnea syndrome
• Procedures during surgery making a former easy airway a difficult airway
• Need for opioids after extubation
• Hypothermia