ClonidineConscious SedationDeep SedationHypnotics and SedativesAdrenergic alpha-AgonistsMidazolamPreanesthetic MedicationAdrenergic alpha-2 Receptor AgonistsPropofolAnesthesia, DentalDexmedetomidineYohimbineReceptors, Adrenergic, alpha-2SympatholyticsAdjuvants, AnesthesiaAnalgesicsAnesthetics, IntravenousAnesthesia Recovery PeriodAnalgesiaAdrenergic alpha-AntagonistsImidazoline ReceptorsFentanylAnesthesia, IntravenousInjections, SpinalGuanfacineReceptors, Adrenergic, alphaAnalgesics, OpioidChloral HydrateHydroxyzineDental AnxietyAlfentanilDouble-Blind MethodDiazepamConsciousness MonitorsAnesthetics, CombinedAnesthesia, LocalPremedicationAnesthesia, GeneralMedetomidineMeperidineAnalgesia, EpiduralPain, PostoperativeMorphineDroperidolAnesthetics, LocalHeart RateKetamineBlood PressurePain MeasurementIdazoxanAnesthetics, DissociativeDose-Response Relationship, DrugAdrenergic alpha-2 Receptor AntagonistsOxymetazolineConsciousnessAnesthesiaNorepinephrineAnesthesia, SpinalPrazosinNitrous OxideRespiration, ArtificialAnti-Anxiety AgentsSufentanilHemodynamicsPainElectroencephalographyPhentolaminePsychomotor AgitationReceptors, AdrenergicBupivacaineIntensive Care UnitsMethohexitalInjections, IntravenousDioxanesHypotensionLidocaineAnesthesia, InhalationIntensive CareDrug InteractionsAnalgesics, Non-NarcoticLorazepamInfusions, IntravenousNaloxoneNeostigmineShiveringProspective StudiesAnesthesia, EpiduralEpinephrineXylazineMonitoring, IntraoperativeRespirationInjections, EpiduralTooth ExtractionGuanabenzNurse AnesthetistsAnalgesia, ObstetricalImidazolesAnesthetics, InhalationAnesthesiologyAcepromazine