Models, CardiovascularMyocytes, CardiacCardiac OutputHeartArrhythmias, CardiacCardiac Surgical ProceduresDeath, Sudden, CardiacCardiac Pacing, ArtificialCardiomegalyCardiac TamponadeHeart DiseasesMyocardiumMyocardial ContractionCardiac CatheterizationTime FactorsHeart VentriclesHeart ArrestHeart FailureElectrocardiographyHeart RateCardiomyopathiesMyoblasts, CardiacHemodynamicsEchocardiographyCardiac Imaging TechniquesCardiac MyosinsCardiac GlycosidesCardiac Output, LowVentricular Function, LeftMyocardial InfarctionTreatment OutcomeVentricular RemodelingOut-of-Hospital Cardiac ArrestCardiac VolumeBlood PressureHeart TransplantationProspective StudiesTroponin IStroke VolumeDogsModels, BiologicalHeart Defects, CongenitalReproducibility of ResultsVentricular Dysfunction, LeftHeart Function TestsRats, Sprague-DawleyCardiac Resynchronization TherapyHeart Conduction SystemAlgorithmsComputer SimulationTroponin TDisease Models, AnimalPredictive Value of TestsCardiomyopathy, DilatedCardiotonic AgentsRetrospective StudiesCardiopulmonary ResuscitationMyocardial IschemiaCalciumHeart NeoplasmsCardiac Care FacilitiesCardiac ElectrophysiologyFollow-Up StudiesFibrosisBiological MarkersCells, CulturedRats, WistarHeart AtriaVentricular FunctionKineticsFetal HeartRisk FactorsSensitivity and SpecificityPrognosis