Tracheal intubation is the only technique to ensure airway protection, meaning preventing aspiration, and providing mechanical ventilation during general anesthesia (GA). This is an extremely frequent procedure. After intubation, the head of the patient is often moved as the patient is positioned for the surgical procedure (ENT, thoracic and abdominal surgeries, lateral or prone positioning…). This may even happen several times during the same procedure. It is well demonstrated that these head movements are responsible for secondary shifting of the tube (1-9). This can cause accidental extubation or selective bronchial intubation.