Myocytes, CardiacAnimals, NewbornMyocardiumCardiomegalyCells, CulturedHypertrophyRats, Sprague-DawleyHeartHeart VentriclesRats, WistarMyocardial ContractionHypertrophy, Left VentricularSignal TransductionGene Expression RegulationPhosphorylationCell SizeMitochondria, HeartCardiac Surgical ProceduresPhenylephrineHeart Defects, CongenitalRNA, MessengerCalciumMuscle CellsCardiac OutputArrhythmias, CardiacIsoproterenolCalcium Channels, L-TypeHypertrophy, Right VentricularFibroblastsVentricular FunctionSodium-Calcium ExchangerAtrial Natriuretic FactorVentricular RemodelingHeart FailureSarcomeresSarcolemmaCalcium SignalingEchocardiographyCardiomyopathiesPatch-Clamp TechniquesTime FactorsAdrenergic beta-AgonistsSarcoplasmic ReticulumDeath, Sudden, CardiacHeart AtriaMuscle ProteinsGuinea PigsReceptors, Adrenergic, betaSarcoplasmic Reticulum Calcium-Transporting ATPasesCardiotonic AgentsMice, TransgenicMyosin Heavy ChainsAction PotentialsModels, CardiovascularHeart DiseasesInfant, NewbornOrgan SizeMembrane PotentialsAngiotensin IIDisease Models, AnimalFibrosisCardiomyopathy, HypertrophicEndothelin-1GATA4 Transcription FactorPotassium ChannelsBlood PressureCalcineurinMice, KnockoutElectrocardiographyCardiac Pacing, ArtificialVentricular Function, LeftRyanodine Receptor Calcium Release ChannelCell EnlargementDogsHemodynamicsHypertensionCardiac MyosinsMice, Inbred C57BLCardiomyopathy, DilatedRabbitsReceptors, Adrenergic, beta-1Myocardial IschemiaCaveolin 3Calcium ChannelsHeart RateElectrophysiologyMyocardial InfarctionEnzyme InhibitorsReceptors, Adrenergic, alpha-1Gene ExpressionTroponin IVentricular MyosinsCardiac Output, LowDose-Response Relationship, DrugMyoblasts, CardiacMyocardial Reperfusion InjuryCardiac CatheterizationMyofibrilsCardiac TamponadeMuscle Fibers, Skeletal