Presurgery Anxiolysis in Children Treated With Hydroxyzine Versus Non-pharmacological Intervention (Distractoria Technique Clown)

Inclusion Criteria: * Children between 2 and 16 years old * Patients with programmed major ambulatory surgery. * Assessment of anesthetic risk ASA I-II. * Informed consent signed by their legal authorized representatives. * No antihistaminic allergies. * Assent signed by children between 12 and 16 years old. Exclusion Criteria: * Patients with previous surgeries. * Anesthetic risk ASA more than II. * Patients with hypersensitivity to the active substance, to any of the excipients, to cetirizine, to other piperazine derivatives, to aminophylline or etilenamida * Patients with porphyria * Patients with known QT prolongation, either congenital or acquired * Patients with known risk factors for QT prolongation including a pre-existing cardiovascular disease, previous electrolyte imbalances, family history of sudden cardiac death, significant bradycardia and concomitant use of drugs with potential known to produce QT prolongation and / or induce Torsades de Pointes.