Myocytes, CardiacMyocardiumMEF2 Transcription FactorsMyogenic Regulatory FactorsMuscle CellsCardiomegalyMyocardial ContractionHeart VentriclesHeartCell SizeCells, CulturedVentricular RemodelingSarcomeresRats, Sprague-DawleyCalciumCardiomyopathiesMyosin Heavy ChainsHypertrophyVentricular FunctionAnimals, NewbornMADS Domain ProteinsSarcoplasmic Reticulum Calcium-Transporting ATPasesHeart FailureModels, CardiovascularIsoproterenolCalcium SignalingSarcoplasmic ReticulumCardiomyopathy, DilatedMice, TransgenicFibrosisApoptosisSignal TransductionVentricular MyosinsSarcolemmaCalcium Channels, L-TypeMuscle ProteinsCardiotonic AgentsReceptors, Adrenergic, beta-1Ventricular Function, LeftSodium-Calcium ExchangerDisease Models, AnimalExcitation Contraction CouplingMuscle Fibers, SkeletalOrgan SizeCell EnlargementTime FactorsReceptors, Adrenergic, betaGATA4 Transcription FactorMyocardial Reperfusion InjuryHypertrophy, Left VentricularMyocardial InfarctionMyocarditisCalcineurinRats, WistarMuscle DevelopmentMyofibrilsGene Expression RegulationMice, KnockoutDogsEchocardiographyAction PotentialsMitogen-Activated Protein Kinase 7Myocardial IschemiaHeart AtriaMitochondria, HeartTranscription FactorsVentricular DysfunctionMuscle, SkeletalPhosphorylationMice, Inbred C57BLHistone DeacetylasesHemodynamicsNecrosisCardiac MyosinsVentricular Dysfunction, LeftVentricular PressureRNA, MessengerCell DifferentiationCalcium-Binding ProteinsEndocardiumCalcium-Transporting ATPasesBlotting, WesternDNA-Binding ProteinsHeart Arrest, InducedAngiotensin IIConnexin 43Caspase 3Caveolin 3Arrhythmias, CardiacAdrenergic beta-1 Receptor AgonistsMicroscopy, ConfocalMyoblastsIn Situ Nick-End LabelingMyogeninCardiomyopathy, AlcoholicPhenylephrineReceptors, Adrenergic, beta-2Cell NucleusTroponin IMyoD Protein