Interest of Tracheal Extubation in Positive Pressure on Postoperative Oxygenation in Adult Digestive Surgery

Inclusion criteria

• Age> 18 and <80
• Patient going to benefit from general anesthesia with orotracheal intubation for surgery lasting more than 60 minutes at the visceral surgery unit of the Rouen University Hospital.
• Person affiliated to a social security scheme
• Person who has read and understood the newsletter and signed the consent form

Exclusion criteria

• Minor patients or age> 80 years
• History of Obstructive Sleep Apnea Syndrome
• Chronic respiratory failure / History of chronic obstructive pulmonary disease
• Surgery < 60 minutes
• Use of methylene blue intraoperatively
• Extubation finally performed in the operating room
• orotracheal intubation difficult to induce general anesthesia
• Suspected inhalation during orotracheal intubation
• Pneumothorax per operative
• Heart failure authenticated by trans thoracic ultrasound <50%
• Neuromuscular pathologies (myasthenia gravis, myopathies)
• Body mass index> 35
• Emergency surgery
• Patient with an ASA IV score (ie according to the definition of the American Society of Anesthesiology)
• Major surgical complications (hemorrhagic shock)
• Major anesthetic complications (anaphylactic shock, bronchospasm)
• Pregnant or parturient or lactating woman or woman of childbearing age without proven contraception
• Person deprived of their liberty by an administrative or judicial decision or person placed under the protection of justice / guardianship or curatorship