Cardiac VolumeEchocardiography, Four-DimensionalFetal HeartHypertrophyHeartEchocardiography, Three-DimensionalStroke VolumeMyocytes, CardiacCardiomegalyHypertrophy, Left VentricularCardiac OutputMyocardiumArrhythmias, CardiacCardiac Surgical ProceduresDeath, Sudden, CardiacHeart VentriclesMyocardial ContractionBlood VolumeEchocardiographyVentricular RemodelingHeart DiseasesHypertrophy, Right VentricularCardiac Pacing, ArtificialHeart FailureCardiac TamponadeCardiac CatheterizationHemodynamicsOrgan SizeElectrocardiographyTime FactorsBlood PressureCardiomyopathiesVentricular Function, LeftHeart RateHeart ArrestFibrosisRats, Sprague-DawleyCardiac MyosinsDisease Models, AnimalMyoblasts, CardiacCardiomyopathy, HypertrophicCardiac Output, LowMyocardial InfarctionAtrial Natriuretic FactorCardiac Imaging TechniquesHypertensionCells, CulturedCardiac GlycosidesCell SizeDogsVentricular Dysfunction, LeftMice, TransgenicCardiotonic AgentsCardiomyopathy, DilatedOut-of-Hospital Cardiac ArrestRats, WistarHeart Transplantation