Descriptive Observational Study of Patient-performed Pre-oxygenation

"Management is not modified. Routine monitoring (ECG, BP, SpO2). As in care, the patient takes the mask and the respirator is started, delivering an inspired oxygen fraction of 100% (FiO2=1).~Monitoring of : inspired fraction of oxygen, expired fraction of oxygen and end-tidal fraction of carbon dioxide. The ventilator also provides the respiratory rate and tidal volume carried out by the patient.~The fresh gas flow is set by default and will be adjusted to 12l/min for patient comfort.After less than a minute, a normal capnia curve and the presence of an FeO2 value appear. Here, time is standardized to 1 min. In the absence of one of these elements, the caregiver always takes control of preoxygenation.Timer is started, it is T0 min. At T 3min, collection of values and decision-making :~* objectives achieved : end of this sequence.~* objectives not achieved, the caregiver takes control again for an additional 2 minutes in order to seek to achieve an FeO2\>90%."

APAIS scale

Visual analog anxiety scale (VAS-A)

Visual analog comfort scale (VAS-C)