Conscious SedationDeep SedationAnalgesiaHypnotics and SedativesAnesthesia, DentalMidazolamAnalgesia, EpiduralPropofolAnalgesia, ObstetricalHydroxyzinePreanesthetic MedicationAnesthetics, IntravenousAnesthesia, LocalMeperidineAnesthesia, GeneralAnesthesia Recovery PeriodDental AnxietyAnalgesia, Patient-ControlledFentanylAnesthesia, RectalAnesthesia, IntravenousConsciousnessChloral HydrateAlphaprodineAnalgesics, OpioidDexmedetomidineEndoscopy, Digestive SystemDiazepamDentistry, OperativeBurns, ElectricPain, PostoperativeNitrous OxideManifest Anxiety ScalePain MeasurementDental ImplantationTooth ExtractionGastric BalloonEndoscopy, GastrointestinalMorphinePainDouble-Blind MethodAnesthetics, LocalAnalgesicsProspective StudiesBupivacainePatient SatisfactionColonoscopyIntubation, IntratrachealKetamineSufentanilAnesthetics, CombinedInjections, IntravenousAdjuvants, AnesthesiaAnesthesia, EpiduralAcupuncture AnalgesiaCholangiopancreatography, Endoscopic RetrogradeAnesthetics, DissociativeBronchoscopyConsciousness MonitorsAlfentanilTreatment OutcomeAnesthesia, SpinalInjections, SpinalPilot ProjectsClonidineNerve BlockTime FactorsDroperidolAnesthesiaOxygenRespiration, ArtificialNeurosurgical ProceduresTramadolAnesthesia, ObstetricalHeart RateAnxietyAnalgesics, Non-NarcoticLabor PainAmbulatory Surgical ProceduresEquipment DesignButorphanolPostoperative Nausea and VomitingAnesthesia, ConductionInfusions, IntravenousBlood PressureIntensive Care UnitsLidocaineDose-Response Relationship, DrugRetrospective StudiesIntensive CareElectroencephalographyPiperidines