Pediatric Emergency Suture Care: a Trial Comparing the Analgesic Efficacy of Hypnosis Versus MEOPA

Inclusion Criteria: * The patient was informed about the implementation of the study, its objectives, constraints and patient rights * The legal representative of the patient must have given free and informed consent and signed the consent * The patient must be affiliated with or beneficiary of a health insurance plan * The patient is available for 15 days of follow-up * The patient is consulting in the emergency department for a wound requiring the completion of a suture and for which the operator considers that the use of nitrous oxide is necessary and possible. Exclusion Criteria: * The patient is participating in another interventional study * The patient has participated in another interventional study in the last 3 months * The patient is in an exclusion period determined by a previous study * The patient and/or his/her parents (or legal representative) refuses to sign the consent * It proves impossible to correctly inform the patient and / or his/her parents (or legal representative) * The patient has a contra-indication (or an incompatible drug combination) for a treatment required in this study (MEOPA): intracranial hypertension, impaired consciousness, pneumothorax, high rate oxygen-dependence, facial trauma preventing mask application. * The patient has a condition that makes hypnosis impossible: e.g. encephalopathy, deafness, communication disorders, does not speak French * Suture requiring surgical exploration or an operating room, or general anesthesia or an ears-nose-throat, orthopedic or visceral surgeon (e.g. wound of the oral cavity, abdominal or thoracic penetrating wound, finger or palm wound requiring exploration by an orthopaedist) * Fractures associated with wound * Use of level II/III analgesics before the beginning of pre-suture care support