HeartHeart RateMyocytes, CardiacHeart FailureHeart DiseasesCardiac OutputHeart TransplantationHeart Defects, CongenitalCardiac Surgical ProceduresDeath, Sudden, CardiacArrhythmias, CardiacMyocardiumFetal HeartMyocardial ContractionCardiomegalyCardiac Pacing, ArtificialHeart ValvesHeart AtriaHeart ArrestHeart Function TestsCardiac CatheterizationHemodynamicsCardiomyopathiesCardiac Output, LowCardiac TamponadeTime FactorsEchocardiographyVentricular Function, LeftMyocardial IschemiaMyocardial InfarctionHeart BlockVentricular RemodelingStroke VolumeCardiomyopathy, DilatedHeart VentriclesCardiotonic AgentsCardiac MyosinsMyoblasts, CardiacHeart Arrest, InducedVentricular Dysfunction, LeftDogsHeart InjuriesHeart NeoplasmsCoronary DiseaseCardiac VolumeCardiac GlycosidesTreatment OutcomeProspective StudiesCardiac Imaging TechniquesRats, Sprague-DawleyElectrocardiographyTroponin IRisk FactorsModels, CardiovascularMyocardial Reperfusion InjuryDisease Models, AnimalOut-of-Hospital Cardiac ArrestFollow-Up StudiesCalciumFibrosisPerfusionAdrenergic beta-AntagonistsCardiac Resynchronization TherapyTroponin TRats, WistarNatriuretic Peptide, BrainIsoproterenolVentricular PressureMyocarditisOxygen ConsumptionHeart SeptumCardiac Care FacilitiesAutonomic Nervous SystemHypertrophy, Left VentricularCells, CulturedExercise TestCardiac ElectrophysiologyBiological MarkersPredictive Value of TestsRetrospective StudiesCardiopulmonary ResuscitationDiastoleSystoleBlood PressureEndocardiumHeart Failure, SystolicRisk AssessmentHeart Valve ProsthesisRabbitsHeart Conduction SystemMice, Inbred C57BLPacemaker, ArtificialMuscle ProteinsPrognosisRheumatic Heart DiseaseCardiopulmonary BypassMice, KnockoutHeart Rate, FetalVentricular DysfunctionRNA, Messenger