35RC17_8826_NEPHROPAIN Phase APRES : Interest of the Equimolar Oxygen Nitride Mixture (MEOPA) in the Treatment of Pain in Patients Presenting to the Emergency Department for Suspected Renal Colic: a Study BEFORE AFTER

Patients included in the study will receive MEOPA with a high concentration mask (bottle stored for at least 48 hours horizontally) at a minimum flow rate of 10 L / min under supervision of a health care worker after explanation of use to the patient in a quiet environment (box). MEOPA will be administered for a maximum total duration of 20 minutes, continuously or not depending on the needs of the patient, but after a continuous phase at the beginning of treatment of at least 3 minutes.