Suspension laryngoscopy is realised during apnea. In effect, surgeons are in the mouth of the patient and we can't have access at the aiways. So investigators like to use a Transnasal Humidified Rapid-Insufflation Ventilatory Exchange (THRIVE) to increase time of apnea and decrease the impact of oxygen desaturation.
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desaturation defined as the number of patient who presented at least one desaturation during suspension laryngoscopy
Timeframe: Two hours