Conscious SedationEtomidateDeep SedationHypnotics and SedativesAnesthesia, DentalMidazolamPropofolAnesthetics, IntravenousHydroxyzinePreanesthetic MedicationAnesthesia, LocalAnesthesia Recovery PeriodDental AnxietyAnesthesia, IntravenousAnesthesia, GeneralAnesthesia, RectalChloral HydrateConsciousnessMeperidineAlphaprodineEndoscopy, Digestive SystemDexmedetomidineDiazepamDentistry, OperativeFentanylBurns, ElectricManifest Anxiety ScaleDental ImplantationNitrous OxideMethohexitalGastric BalloonEndoscopy, GastrointestinalTooth ExtractionIntubation, IntratrachealThiopentalAnesthetics, GeneralProspective StudiesColonoscopyKetamineDouble-Blind MethodAnalgesiaPatient SatisfactionAnesthetics, CombinedCholangiopancreatography, Endoscopic RetrogradeBronchoscopyConsciousness MonitorsAnesthesiaAnesthetics, DissociativeReflex, RightingInjections, IntravenousAnestheticsElectroencephalographyPainReceptors, GABA-APropylene GlycolPilot ProjectsAdjuvants, AnesthesiaAnalgesics, OpioidHeart RateTreatment OutcomeRespiration, ArtificialDose-Response Relationship, DrugNeurosurgical ProceduresTime FactorsOxygenHypnosis, AnestheticBlood PressureAnxietyAlfentanilPentobarbitalDroperidolIntensive Care UnitsEquipment DesignRetrospective StudiesDogs