HypotensionCardiac OutputHypotension, ControlledHemodynamicsBlood PressureVascular ResistanceShock, SepticHypotension, OrthostaticHeart RateDogsHypertension, PulmonaryCerebrovascular CirculationThermodilutionIntracranial HypotensionSwineMyocytes, CardiacCardiac Output, LowVasodilator AgentsTime FactorsBrain IschemiaNitric OxideVasodilationHeartDye Dilution TechniqueCardiac Output, HighCardiac Surgical ProceduresCardiography, ImpedanceStroke VolumeRegional Blood FlowArrhythmias, CardiacOxygen ConsumptionBlood VolumeCatheterization, Swan-GanzBlood CirculationHeart Function TestsMyocardial ContractionPulmonary CirculationHeart FailureDeath, Sudden, CardiacCardiac CatheterizationCardiac Pacing, ArtificialMonitoring, PhysiologicHeart VentriclesHeart DiseasesMyocardiumCardiac TamponadeBradycardiaCentral Venous PressureOxygenEchocardiographyCardiovascular Physiological PhenomenaElectrocardiographyVentricular Function, LeftAnesthesiaCardiovascular SystemTrimethaphanCardiomegalyCarbon DioxideBlood Gas AnalysisIndicator Dilution TechniquesShockPhysical ExertionHeart ArrestBlood Flow VelocityCardiac VolumeNorepinephrineHypovolemiaCardiotonic AgentsSplanchnic CirculationPost-Exercise HypotensionFluid TherapyPostureBlood Volume DeterminationProspective StudiesRats, Sprague-DawleyModels, CardiovascularEphedrineMonitoring, IntraoperativeAutonomic Nervous System DiseasesPulmonary ArteryRespirationTreatment OutcomeExercise TestPulmonary Wedge PressureAnesthesia, SpinalCardiomyopathiesCoronary CirculationAnesthesia, ObstetricalSupine PositionSyncopeResuscitationEchocardiography, DopplerEpinephrineArterial PressureVentricular FunctionPulmonary Gas ExchangeDisease Models, AnimalPressoreceptorsHemorrhageBaroreflex