Conscious SedationAnesthesia, DentalHypnotics and SedativesMidazolamDeep SedationPropofolHydroxyzineAnesthetics, IntravenousPreanesthetic MedicationAnesthesia, LocalAnesthesia, GeneralAnesthesia Recovery PeriodDental AnxietyAnesthesia, IntravenousAnesthesia, RectalAlphaprodineConsciousnessMeperidineEndoscopy, Digestive SystemChloral HydrateDentistry, OperativeBurns, ElectricAnalgesics, OpioidDiazepamNitrous OxideDexmedetomidineDental ImplantationManifest Anxiety ScaleGastric BalloonEndoscopy, GastrointestinalTooth ExtractionFentanylIntubation, IntratrachealDouble-Blind MethodProspective StudiesInjections, IntravenousColonoscopyAdjuvants, AnesthesiaPainPatient SatisfactionAnesthetics, CombinedAlfentanilCholangiopancreatography, Endoscopic RetrogradeBronchoscopyAnalgesiaAnalgesia, EpiduralSufentanilPain, PostoperativeNeurosurgical ProceduresPilot ProjectsHeart RateAnesthesiaTreatment OutcomeOxygenBupivacainePain MeasurementMorphineTime FactorsBlood PressureDroperidolAnalgesia, Patient-ControlledKetamineDogsAnesthetics, LocalAnxietyEquipment DesignHemodynamicsAnesthetics, InhalationAnalgesia, ObstetricalDose-Response Relationship, DrugAdministration, CutaneousAnesthetics, DissociativeRetrospective Studies