Models, CardiovascularModels, BiologicalModels, ChemicalModels, MolecularComputer SimulationMyocytes, CardiacCardiac OutputHeartArrhythmias, CardiacCardiac Surgical ProceduresDeath, Sudden, CardiacCardiomegalyCardiac TamponadeCardiac Pacing, ArtificialHeart DiseasesMyocardiumCardiac CatheterizationMyocardial ContractionHeart ArrestHeart VentriclesMyoblasts, CardiacHeart FailureCardiomyopathiesCardiac MyosinsCardiac Imaging TechniquesElectrocardiographyCardiac GlycosidesHeart RateEchocardiographyCardiac Output, LowOut-of-Hospital Cardiac ArrestTime FactorsHemodynamicsMyocardial InfarctionCardiac VolumeVentricular RemodelingHeart TransplantationTroponin IVentricular Function, LeftHeart Defects, CongenitalStroke VolumeBlood PressureCardiac Resynchronization TherapyHeart Function TestsTroponin THeart Conduction SystemCardiopulmonary ResuscitationHeart NeoplasmsCardiac Care FacilitiesDogsCardiomyopathy, DilatedVentricular Dysfunction, LeftCardiotonic AgentsMyocardial IschemiaTreatment OutcomeCardiac ElectrophysiologyFibrosisRats, Sprague-DawleyFetal Heart