PropofolBradycardiaAnesthetics, IntravenousHeart RateHypnotics and SedativesApneaAnesthetics, CombinedConscious SedationAnesthesia Recovery PeriodVagus NerveHypotensionAnesthesiaAnesthesia, GeneralThiopentalAnesthetics, InhalationBlood PressureReflexMonitoring, IntraoperativeMethyl EthersAlfentanilMidazolamDeep SedationConsciousnessSinoatrial NodeFentanylElectroencephalographyArrhythmia, SinusReflex, OculocardiacEtomidateAnestheticsElectrocardiographyMethohexitalAtropineDose-Response Relationship, DrugConsciousness MonitorsAnesthetics, GeneralHeart BlockDivingBiguanidesPiperidinesBaroreflexSick Sinus SyndromeRespirationHemodynamicsInfusions, IntravenousAdjuvants, AnesthesiaSyncopePacemaker, ArtificialIsofluraneCardiovascular SystemKetaminePreanesthetic MedicationNitrous OxideHeartTachycardiaVagotomyAtropine DerivativesAtrioventricular BlockClonidineArrhythmias, CardiacChemoreceptor CellsMedulla OblongataParasympatholyticsPressoreceptorsInjections, IntravenousAnesthetics, DissociativeAnesthesia, SpinalSyncope, VasovagalDexmedetomidineDecerebrate StateParasympathetic Nervous SystemDogsIntubation, IntratrachealUnconsciousnessDrug InteractionsRats, Sprague-DawleyCardiac Pacing, ArtificialRats, WistarCarotid SinusDouble-Blind MethodImmersionSolitary NucleusIntraoperative ComplicationsAnalgesics, OpioidAutonomic Nervous SystemEmulsionsAnti-Arrhythmia AgentsSympathetic Nervous SystemHeart ArrestSympatholyticsMicroinjectionsCiguatera PoisoningHeart Rate, FetalPentobarbitalInfusion PumpsPostsynaptic Potential SummationAmbulatory Surgical ProceduresTime FactorsTorsades de PointesProspective Studies