Cardiac VolumeCardiomegalyEchocardiography, Four-DimensionalFetal HeartEchocardiography, Three-DimensionalHeartStroke VolumeBlood VolumeMyocytes, CardiacVentricular RemodelingVenae CavaeArteriovenous FistulaCardiac OutputMyocardiumHemodynamicsVentricular Function, RightHeart FailureHeart VentriclesHypertrophy, Left VentricularWater-Electrolyte ImbalanceHyperemiaVentricular Function, LeftVentricular PressureEchocardiographyMyocardial ContractionAortic Valve InsufficiencyOrgan SizeBlood PressureTime FactorsPlasma VolumeMitral Valve InsufficiencyCardiac CatheterizationCardiac Output, LowDielectric SpectroscopyRats, Sprague-DawleyDiastoleAtrial Natriuretic FactorDogsDisease Models, AnimalLung Volume MeasurementsArrhythmias, CardiacVentricular Dysfunction, LeftCardiac Surgical ProceduresHeart DiseasesVentricular Dysfunction, RightNatriuretic Peptide, BrainHeart RateUrotensinsHeart Septal Defects, AtrialDeath, Sudden, CardiacPulmonary Valve InsufficiencyCardiac Output, HighArteriovenous Shunt, SurgicalHemochromatosisMagnetic Resonance ImagingRats, WistarTreatment OutcomeSystoleErythrocyte VolumeCardiography, ImpedanceElectrocardiographyBlood Volume Determination