DexmedetomidinePremedicationConscious SedationMedetomidinePreanesthetic MedicationHypnotics and SedativesDeep SedationAnesthesia, GeneralAnesthesiaAdrenergic alpha-AgonistsMidazolamAdrenergic alpha-2 Receptor AgonistsAdjuvants, AnesthesiaAnesthesia, LocalAnesthesia, IntravenousPropofolAnesthesia, DentalAnesthesia, InhalationAnesthesia, SpinalAnesthesia Recovery PeriodAnesthetics, IntravenousAnesthesia, EpiduralFentanylAnesthesia, ConductionMeperidineClonidineAnesthetics, InhalationAcepromazineKetamineMethyl EthersAnesthetics, CombinedAnesthesia, ObstetricalDiazepamDouble-Blind MethodAmbulatory Surgical ProceduresImidazolesIsofluraneAnti-Anxiety AgentsAnesthetics, LocalNitrous OxideAnalgesics, Non-NarcoticAnestheticsInfusions, Intravenous