Myocytes, CardiacHeartCardiac OutputMyocardiumHeart Function TestsMyocardial ContractionVentricular Function, LeftCardiomegalyArrhythmias, CardiacVentricular RemodelingEchocardiographyHeart FailureCardiomyopathiesCardiac Surgical ProceduresHeart VentriclesMyocardial InfarctionHeart DiseasesHemodynamicsDeath, Sudden, CardiacStroke VolumeCardiomyopathy, DilatedHeart RateCardiotonic AgentsVentricular Dysfunction, LeftCardiac Pacing, ArtificialDisease Models, AnimalVentricular PressureElectrocardiographyFibrosisTime FactorsCardiac CatheterizationVentricular FunctionMyocardial Reperfusion InjuryMyocardial IschemiaBlood PressureCardiac Output, LowMyoblasts, CardiacCardiac MyosinsCardiac TamponadeFetal HeartRats, Sprague-DawleyVentricular DysfunctionHeart ArrestTroponin IDiastoleSarcoplasmic Reticulum Calcium-Transporting ATPasesSystoleMice, TransgenicCardiac VolumeMice, Inbred C57BLCardiac Imaging TechniquesHypertrophy, Left VentricularMyocarditisMice, KnockoutIsoproterenolEchocardiography, DopplerRats, WistarCoronary CirculationCalciumDogsHeart Defects, CongenitalHeart TransplantationMyosin Heavy ChainsAtrial Natriuretic FactorTreatment OutcomeMagnetic Resonance Imaging, CineNatriuretic Peptide, BrainMitochondria, HeartTroponin TCells, CulturedModels, CardiovascularCardiac GlycosidesCoronary VesselsReceptors, Adrenergic, betaDiabetic CardiomyopathiesVentricular MyosinsAdrenergic beta-AgonistsHeart Conduction SystemOut-of-Hospital Cardiac ArrestEdema, CardiacAdrenergic beta-AntagonistsHeart AtriaCardiac Resynchronization TherapyCreatine KinaseOrgan SizeProspective StudiesSarcomeresMuscle CellsSignal TransductionCardiac ElectrophysiologyOxygen ConsumptionMuscle ProteinsBiological MarkersModels, AnimalCalcium-Binding ProteinsCardiopulmonary BypassFollow-Up StudiesPericardiumEchocardiography, Doppler, PulsedReceptors, Adrenergic, beta-1