Pain Prevention During Propofol Infusion in Pediatric: Hypnoanalgesia of the Hand Versus Lidocaine.

Inclusion Criteria: * Children from 7 to 14 years old. * Admitted for programmed or ambulatory surgery under general anesthesia. * ASA I to II. (ASA1: Normal patient or ASA 2: Patient with moderate systemic abnormality). * Parents or legal guardians who have signed informed consent to the inclusion visit. Exclusion Criteria: * Children under 7, over 14 * In regulated girls, presence of a pregnancy * ASA III, IV * Contraindication to propofol (known hypersensitivity to propofol or to one of its constituents) * Contraindications to lidocaine (known hypersensitivity to lidocaine hydrochloride, amide bonded local anesthetics or to any of the excipients, patients with recurrent porphyria) * Contraindications to nitrous oxide * Patient whose clinical condition requires titration of propofol during induction, for good hemodynamic tolerance. * Refusal by the child or the parents of intravenous induction. * Psychological distress (agitation, mental deficiencies, communication disorders, deafness problems). * Analgesic or sedative treatment within 24 hours before induction. * Locoregional or perimedullary anesthesia before anesthetic induction.