Myocytes, CardiacHeartMyocardiumCardiac OutputArrhythmias, CardiacCardiac Surgical ProceduresDeath, Sudden, CardiacMyocardial ContractionCardiomegalyMyoblasts, CardiacHeart VentriclesHeart DiseasesCardiac Pacing, ArtificialCardiac TamponadeCardiac CatheterizationCardiomyopathiesModels, CardiovascularHeart ArrestCells, CulturedHeart FailureTime FactorsCalciumVentricular FunctionElectrocardiographyHeart RateMyocardial InfarctionCardiac MyosinsVentricular RemodelingCardiac Imaging TechniquesHeart Conduction SystemAnimals, NewbornCardiac ElectrophysiologyRats, Sprague-DawleyCardiac GlycosidesHemodynamicsEchocardiographyMitochondria, HeartCardiac Output, LowVentricular Function, LeftCardiotonic AgentsHeart AtriaOut-of-Hospital Cardiac ArrestMyocardial IschemiaCardiac VolumeSarcolemmaDogsHeart TransplantationSarcomeresTroponin IAction PotentialsMyofibrilsHeart Defects, CongenitalFetal HeartFibrosisRats, WistarGuinea PigsMuscle CellsStroke VolumeBlood PressureCardiac Resynchronization TherapyIsoproterenolHeart Function TestsDisease Models, AnimalMuscle ProteinsTroponin TAtrial Natriuretic FactorCardiopulmonary ResuscitationHeart NeoplasmsCardiac Care FacilitiesMyocardial Reperfusion InjuryMembrane PotentialsMice, TransgenicCardiomyopathy, DilatedVentricular Dysfunction, LeftGATA4 Transcription FactorSignal TransductionCreatine Kinase, Mitochondrial FormTreatment OutcomeElectrophysiologyTroponinPericardiumProspective StudiesAnti-Arrhythmia AgentsCalcium SignalingCalcium Channels, L-TypeMice, Inbred C57BLRNA, MessengerCell DifferentiationSodium-Calcium ExchangerHeart InjuriesChick EmbryoPotassium ChannelsRabbitsRyanodine Receptor Calcium Release ChannelMice, KnockoutBiological MarkersSodiumSodium ChannelsCardiopulmonary BypassEndocardium