SydnonesMyocardiumGlucoseMyocytes, CardiacEnergy MetabolismHeartSubstrate SpecificityCardiomegalyCardiac OutputCells, CulturedMyocardial ContractionArrhythmias, CardiacHeart VentriclesKineticsAnimals, NewbornCardiac Surgical ProceduresDeath, Sudden, CardiacRats, Sprague-DawleyMolecular Sequence DataCalciumRats, WistarTime FactorsHeart DiseasesAmino Acid SequenceCardiomyopathiesMyoblasts, CardiacCardiac MyosinsHeart FailureMitochondria, HeartCardiotonic AgentsSignal TransductionPhosphorylationCardiac Pacing, ArtificialVentricular RemodelingSarcomeresBinding SitesMyocardial InfarctionMyocardial Reperfusion InjuryCardiac TamponadeIsoproterenolMyocardial IschemiaMice, TransgenicGATA4 Transcription FactorEnzyme ActivationCardiomyopathy, DilatedProtein BindingCardiac CatheterizationTroponin ICatalysisCell SizeMuscle ProteinsApoptosisCalcium Channels, L-TypeCell DifferentiationModels, MolecularMuscle CellsSarcolemmaEchocardiographyDisease Models, AnimalHeart ArrestMice, Inbred C57BLRecombinant ProteinsCell LineHeart AtriaRNA, MessengerEnzyme InhibitorsEmbryonic Stem CellsBase SequenceVentricular Function, LeftSarcoplasmic Reticulum Calcium-Transporting ATPasesElectrocardiographyMutationAtrial Natriuretic FactorCalcium SignalingMice, KnockoutHeart RateAdenosine TriphosphateHypertrophyHydrogen-Ion ConcentrationConnexin 43HemodynamicsDogsDose-Response Relationship, DrugAdrenergic beta-AgonistsBlotting, WesternSodium-Calcium ExchangerHydrolysisVentricular MyosinsFibrosisCardiac Output, LowGene ExpressionGene Expression RegulationModels, CardiovascularRabbitsOxidation-ReductionCardiac Imaging TechniquesHeart Conduction SystemTroponin THeart TransplantationFetal Heart