IsofluraneAnesthetics, DissociativeAnesthetics, InhalationHalothaneAnesthesia, InhalationEnfluraneMethyl EthersAnestheticsNitrous OxideXylazineAnesthesiaAnesthetics, IntravenousAnesthetics, CombinedPropofolDose-Response Relationship, DrugThiopentalAnesthesia, GeneralAnalgesicsExcitatory Amino Acid AntagonistsEthersFentanylAnesthetics, GeneralMidazolamAnesthesia Recovery PeriodPentobarbitalAnesthesia, IntravenousAdjuvants, AnesthesiaHemodynamicsRats, Sprague-DawleyMedetomidineXenonDogsAcepromazineReceptors, N-Methyl-D-AspartateDepressive Disorder, Treatment-ResistantDrug InteractionsPreanesthetic MedicationBlood Gas AnalysisElectroencephalographyDepression, ChemicalStereoisomerismConscious SedationEtherMethoxyfluraneHeart RateBlood PressureBrainIschemic Preconditioning, MyocardialMethohexitalPulmonary AlveoliAnesthesia, CaudalRespirationDexmedetomidineAmnesia, AnterogradeHeartIschemic PreconditioningAnalgesics, OpioidPsychoses, Substance-InducedPartial PressurePain, PostoperativeDouble-Blind MethodTiletamineMyocardial ContractionRats, WistarMonitoring, IntraoperativeEtomidateTime FactorsIntracranial PressureAnalgesiaMorphineAnesthesia, IntratrachealCarbon DioxideCerebrovascular CirculationShiveringKetamine