Difficult orotracheal intubation carries a risk of hemodynamic collapse, neurological sequelae secondary to cerebral anoxia or death. Anesthetic scores and predictive indices are used to predict difficulties and avoid complications for usual tracheal intubation. However, existing indices are not adapted to selective bronchial intubations.

The aim of the study is to determine the incidence of unexpected difficult SBI using conventional screening tests. It is a prospective descriptive epidemiological monocentric study comparing two groups of patients (selective vs. non selective intubations).

Inclusion Criteria:

• For adult patients : age greater than or equal to 18 years
• Patients with thoracic, cardiac, vascular or plastic surgery

Exclusion Criteria:

• Intubations performed before admission to the operating room or catheterization room;
• Patient whose age is less than 18 years
• Traditional re-intubation at the end of the procedure after a selective lung IOT;
• Selective re-intubation in a patient previously intubated on arrival at the operating theater;
• IOT in other departments of the HML (intensive care, Pulmonary Postoperative Unit (UPOP), bronchoscopy, hospitalization services, Intensive Care Unit (ICU), etc.).

All adult patients with intubation during surgery in Marie Lannelongue's hospital