DexmedetomidinePropofolMedetomidineHypnotics and SedativesAdrenergic alpha-2 Receptor AgonistsAdrenergic alpha-AgonistsAnesthetics, IntravenousConscious SedationAdjuvants, AnesthesiaImidazolesAnalgesics, Non-NarcoticReceptors, Adrenergic, alpha-2MidazolamDeep SedationAnesthesia Recovery PeriodAlfentanilFentanylConsciousness MonitorsAnesthetics, InhalationAnesthetics, CombinedPreanesthetic MedicationThiopentalAnesthesia, GeneralInfusions, IntravenousHemodynamicsDose-Response Relationship, DrugShiveringClonidineAdrenergic alpha-AntagonistsAnestheticsIsofluraneIdazoxanAirway ExtubationAdrenergic alpha-2 Receptor AntagonistsImidazoline ReceptorsMethyl EthersPsychomotor AgitationDouble-Blind MethodKetamineDioxanesMonitoring, IntraoperativeElectroencephalographyHeart RateEtomidateAnalgesicsUnconsciousnessInjections, SpinalPremedicationAnalgesics, OpioidAdjuvants, PharmaceuticAnesthesiaDrug InteractionsAnalgesiaIntubation, IntratrachealSympatholyticsBlood PressureNitrous OxidePiperidinesDeliriumLocus CoeruleusIntensive CareHalothaneRats, Sprague-DawleyAnesthetics, Local