Anesthetics, DissociativeInfusions, IntravenousInfusions, ParenteralXylazineInfusion PumpsAnalgesicsExcitatory Amino Acid AntagonistsAnesthetics, CombinedAnestheticsMidazolamInfusions, Intra-ArterialThiopentalDose-Response Relationship, DrugAnesthetics, IntravenousReceptors, N-Methyl-D-AspartateAnesthesia, IntravenousPropofolDepressive Disorder, Treatment-ResistantAcepromazineAnesthesiaConscious SedationMedetomidineAdjuvants, AnesthesiaStereoisomerismPentobarbitalAnesthesia, CaudalDouble-Blind MethodPsychoses, Substance-InducedAnesthesia, GeneralPain, PostoperativeRats, Sprague-DawleyPreanesthetic MedicationInjections, IntravenousAnalgesics, OpioidAnalgesiaBlood PressureFentanylInjections, IntramuscularInfusion Pumps, ImplantableHeart RateMorphineTiletamineDrug InteractionsTime FactorsPain MeasurementHemodynamicsPain, IntractableDexmedetomidineDrug Administration ScheduleAntidepressive AgentsInfusions, SubcutaneousInjections, SpinalCross-Over StudiesDogsRespirationAnesthesia Recovery PeriodRats, WistarEtomidatePhencyclidineZolazepamDizocilpine MaleateAnalgesia, EpiduralBrainMemantineAnesthetics, LocalHallucinogensDiazepamAnesthesia, DentalN-MethylaspartateInfusions, IntralesionalAdjuvants, PharmaceuticHalothaneDextromethorphanHyperalgesiaNitrous OxideAmnesia, AnterogradeRiluzoleAnesthetics, InhalationDrug SynergismDisease Models, AnimalElectroencephalographyBehavior, AnimalDrug CombinationsAnalysis of VarianceRandom AllocationLidocaineAnesthesia, RectalNeurotoxicity SyndromesAnesthesia, InhalationSurgical Procedures, MinorTreatment OutcomeIsofluraneDrug ToleranceAnalgesia, Patient-ControlledNorepinephrineGlucoseAlfentanilAdministration, RectalPainMethohexital