PropofolAnesthetics, IntravenousHypnotics and SedativesConscious SedationAnesthetics, CombinedAnesthesia Recovery PeriodThiopentalAnesthetics, InhalationMethyl EthersAlfentanilAnesthesia, GeneralDeep SedationMidazolamMonitoring, IntraoperativeFentanylEtomidateMethohexitalConsciousness MonitorsAnesthetics, GeneralElectroencephalographyInfusions, IntravenousAnestheticsIsofluraneAnesthesiaPiperidinesNitrous OxideConsciousnessKetamineDose-Response Relationship, DrugDouble-Blind MethodDrug Administration ScheduleAnesthetics, DissociativeAdjuvants, AnesthesiaUnconsciousnessDrug InteractionsInfusion PumpsEmulsionsInjections, IntravenousPreanesthetic MedicationAnalgesics, OpioidRadiation DosageLethal Dose 50Ambulatory Surgical ProceduresTime FactorsAnesthesia, InhalationIntubation, IntratrachealHeart RateNeuromuscular Nondepolarizing AgentsHemodynamicsRats, Sprague-Dawley