Conscious SedationAnesthesia, DentalHypnotics and SedativesMidazolamDeep SedationAnesthetics, DissociativeHydroxyzinePropofolPreanesthetic MedicationAnesthetics, IntravenousAnesthesia, LocalAnesthesia, GeneralAnesthesia, RectalDental AnxietyAlphaprodineAnesthesia Recovery PeriodConsciousnessAnesthesia, IntravenousMeperidineChloral HydrateEndoscopy, Digestive SystemDentistry, OperativeBurns, ElectricDiazepamDexmedetomidineDental ImplantationManifest Anxiety ScaleGastric BalloonNitrous OxideFentanylEndoscopy, GastrointestinalTooth ExtractionIntubation, IntratrachealColonoscopyProspective StudiesDouble-Blind MethodCholangiopancreatography, Endoscopic RetrogradePatient SatisfactionInjections, IntravenousBronchoscopyAnesthetics, CombinedXylazinePainAnalgesicsAnalgesiaNeurosurgical ProceduresPilot ProjectsOxygenTreatment OutcomeAdjuvants, AnesthesiaAnesthesiaHeart RateAnxietyTime FactorsEquipment DesignBlood PressureAnestheticsAnalgesics, OpioidDogsRetrospective Studies