Myocardial ContractionMyocytes, CardiacHeartMyocardiumCardiac OutputSarcoplasmic Reticulum Calcium-Transporting ATPasesIsoproterenolCardiotonic AgentsCardiomegalyCalciumCalcium-Binding ProteinsHeart VentriclesHemodynamicsVentricular Function, LeftPapillary MusclesHeart FailureHeart RateAdrenergic beta-AgonistsBlood PressureDogsSarcoplasmic ReticulumReceptors, Adrenergic, betaCardiomyopathiesTroponin ICardiac MyosinsSarcomeresVentricular FunctionCalcium SignalingRats, Sprague-DawleySodium-Calcium ExchangerReceptors, Adrenergic, beta-1Heart DiseasesCardiac Pacing, ArtificialGasotransmittersMice, KnockoutHeart Function TestsVentricular PressureArrhythmias, CardiacMice, TransgenicTime FactorsEchocardiographyCardiac Surgical ProceduresCalcium Channels, L-TypeCardiac Output, LowMyofibrilsExcitation Contraction CouplingMyosin Heavy ChainsAdrenergic beta-AntagonistsStroke VolumeVentricular RemodelingCalcium-Transporting ATPasesVascular ResistanceDeath, Sudden, CardiacCardiomyopathy, DilatedPerfusionRyanodine Receptor Calcium Release ChannelMuscle ContractionVentricular MyosinsDisease Models, AnimalDose-Response Relationship, DrugRats, WistarSystoleElectrocardiographyDobutamineActin CytoskeletonMuscle ProteinsCells, CulturedClass Ib Phosphatidylinositol 3-KinaseMyocardial Reperfusion InjuryUterine ContractionReceptors, Adrenergic, beta-2Myocardial InfarctionPhosphorylationCoronary CirculationVentricular Dysfunction, LeftMice, Inbred C57BLSignal TransductionHydrazonesCyclic AMP-Dependent Protein KinasesNorepinephrineMyocardial IschemiaRabbitsCardiac CatheterizationSarcolemmaCardiovascular Physiological PhenomenaNitric OxideStimulation, ChemicalDiastoleCardiac TamponadePropanolaminesGuinea PigsReceptors, Adrenergic, beta-3Atrial Natriuretic FactorSodium-Potassium-Exchanging ATPaseOuabainDepression, ChemicalCardiovascular SystemCyclic AMPMyosinsProtein Kinase C-alpha