Heart AtriaMyocytes, CardiacPhenotypeHeart VentriclesMyocardiumLarvaDrosophila melanogasterCells, CulturedCardiomegalyHeartMyocardial ContractionMutationAnimals, NewbornRats, WistarCalciumRats, Sprague-DawleyCell SizeCardiac MyosinsIsoproterenolCardiotonic AgentsSarcomeresCalcium Channels, L-TypeAdrenergic beta-AgonistsSarcoplasmic Reticulum Calcium-Transporting ATPasesVentricular FunctionExcitation Contraction CouplingHypertrophySignal TransductionSarcolemmaMitochondria, HeartCalcium SignalingSodium-Calcium ExchangerConnexin 43PhenylephrineSarcoplasmic ReticulumAtrial Natriuretic FactorApoptosisMice, TransgenicPatch-Clamp TechniquesRyanodine Receptor Calcium Release ChannelAction PotentialsHeart FailureMicroscopy, ConfocalGATA4 Transcription FactorMice, Inbred C57BLTime FactorsCell DifferentiationMice, KnockoutEnzyme ActivationRNA, MessengerPhosphorylationMyocardial Reperfusion InjuryCalcium-Binding ProteinsDisease Models, AnimalDose-Response Relationship, DrugVentricular RemodelingGene ExpressionProtein Kinase CAngiotensin IICaffeineEmbryonic Stem CellsArrhythmias, CardiacBlotting, WesternPropanolaminesReceptors, Adrenergic, betaRabbitsEnzyme InhibitorsCardiomyopathiesGap JunctionsMuscle CellsVentricular MyosinsCalcium ChannelsStimulation, ChemicalCyclic AMP-Dependent Protein KinasesCyclic AMPPhosphodiesterase InhibitorsPotassium ChannelsCytosolIon TransportMyoblasts, CardiacGuinea PigsDogsPhenylalanineGene Expression RegulationMyocardial IschemiaTransfectionMuscle ProteinsImidazolesCell EnlargementCell SurvivalCalcium Channel BlockersMyocardial InfarctionCardiomyopathy, DilatedReactive Oxygen SpeciesRegenerationMitogen-Activated Protein Kinase 1Reverse Transcriptase Polymerase Chain ReactionMembrane PotentialsSodium ChannelsCell Line