Cardiac OutputBlood PressurePressureHemodynamicsVascular ResistanceDogsHeart RateAortaHeartBlood Pressure DeterminationThermodilutionArterial PressureMyocytes, CardiacCardiac Output, LowCoronary CirculationBlood CirculationPulseCardiac CatheterizationModels, CardiovascularPulsatile FlowRegional Blood FlowBlood Flow VelocityTransducers, PressureRadial ArteryStroke VolumeMyocardial ContractionHypertensionOxygen ConsumptionHydrostatic PressureVentricular PressureComplianceVentricular Function, LeftDye Dilution TechniqueCardiac Output, HighHeart VentriclesDiastoleSystoleMyocardiumBlood VolumeCardiac Surgical ProceduresCardiography, ImpedanceTime FactorsCardiac Pacing, ArtificialArteriesPulmonary CirculationCardiac VolumeHeart FailureCardiomegalyVentricular FunctionArrhythmias, CardiacCentral Venous PressureEchocardiographyNitroglycerinElectrocardiographyOxygenAorta, ThoracicHypotensionVasodilator AgentsCatheterization, Swan-GanzBrachial ArteryAnesthesiaCarotid SinusPulmonary ArteryPressoreceptorsPhysical ExertionMonitoring, PhysiologicHeart Function TestsPulmonary Wedge PressureEchocardiography, DopplerPerfusionMetaraminolElasticityDeath, Sudden, CardiacAntihypertensive AgentsPropranololNorepinephrineCoronary VesselsProspective StudiesReproducibility of ResultsAortic Valve StenosisHyperemiaConstrictionHeart DiseasesVentricular Dysfunction, LeftCardiovascular Physiological PhenomenaIntracranial PressureBlood Pressure Monitoring, AmbulatorySwineCoronary DiseaseOphthalmodynamometryIntraocular PressureAdrenergic beta-AntagonistsCollateral CirculationCarbon DioxideCardiac TamponadeRestTreatment OutcomeManometrySympathetic Nervous SystemCatheterization