Central Venous PressureCardiac OutputHemodynamicsBlood PressureHeart FailurePulmonary Wedge PressureStroke VolumePressureBlood VolumeLower Body Negative PressureVentricular PressureHeart RateDiastoleVascular ResistanceEchocardiography, DopplerVentricular Function, LeftCardiac CatheterizationEchocardiography, Doppler, PulsedHeartVentricular Dysfunction, LeftMitral ValveMyocytes, CardiacVascular CapacitanceVenous PressureMyocardial ContractionEchocardiographyHeart VentriclesAtrial Function, LeftHydrostatic PressureSystoleVentricular FunctionBlood Flow VelocityCardiac Surgical ProceduresHypertensionDogsBlood CirculationCardiac VolumeRoot Canal Filling MaterialsNatriuretic Peptide, BrainTime FactorsMyocardiumEchocardiography, Doppler, ColorBlood Pressure DeterminationHeart DiseasesArrhythmias, CardiacCatheterization, Swan-GanzProspective StudiesComplianceCoronary CirculationAtrial FunctionModels, CardiovascularDeath, Sudden, CardiacHeart AtriaVentricular Function, RightTransducers, PressureValsalva ManeuverCardiomyopathiesElectrocardiographyCardiomegalyIntracranial PressureCardiomyopathy, HypertrophicIsosorbide DinitrateHydralazineCardiomyopathy, DilatedIntraocular PressureBlood Pressure Monitoring, AmbulatoryHeart Function TestsCardiotonic AgentsAtrial Natriuretic FactorVentricular RemodelingAnesthesiaReproducibility of ResultsPredictive Value of TestsCardiac Pacing, ArtificialVentricular Dysfunction, RightMyocardial InfarctionAtrial Function, RightCardiomyopathy, RestrictiveAtmospheric PressureHeart Failure, SystolicAir PressureHypertrophy, Left VentricularPrenalterolRegional Blood FlowPericardiumCardiac TamponadeHeart Failure, DiastolicCoronary DiseaseTreatment OutcomeArterial PressurePulmonary CirculationPulmonary ArteryNitroglycerinExercise TestPositive-Pressure RespirationOrthostatic IntolerancePhysical ExertionVeinsFollow-Up StudiesAnalysis of Variance