Preanesthetic MedicationMeperidineAnxiety, SeparationMidazolamNitrous OxideAdministration, OralDouble-Blind MethodAcepromazineTrinidad and TobagoShiveringHypnotics and SedativesAnesthesiaHalothaneRespirationAnesthesia, GeneralAnalgesics, OpioidMedication ErrorsMedication AdherenceAdjuvants, Anesthesia