Cardiac ElectrophysiologyCardiomyopathy, DilatedElectrophysiological ProcessesCardiomyopathy, HypertrophicElectrophysiologic Techniques, CardiacEpicardial MappingArrhythmias, CardiacHeartModels, CardiovascularMyocytes, CardiacHeart Conduction SystemElectrophysiologyCardiomyopathiesElectrocardiographyVoltage-Sensitive Dye ImagingElectrophysiological PhenomenaHeart VentriclesAction PotentialsMyocardiumAtrioventricular NodeCardiomyopathy, RestrictiveTakotsubo CardiomyopathyCatheter AblationCardiac OutputLong QT SyndromeComputer SimulationDeath, Sudden, CardiacCardiomyopathy, Hypertrophic, FamilialHeart RateChagas CardiomyopathyCardiac Surgical ProceduresEchocardiographyCardiac Pacing, ArtificialPotassium ChannelsMyocardial ContractionHeart FailureCardiomegalyHeart DiseasesVentricular Function, LeftCardiac CatheterizationCardiomyopathy, AlcoholicCardiac MyosinsVentricular Dysfunction, LeftAlgorithmsTime FactorsMyocarditisStroke VolumeCardiac TamponadeHemodynamicsArrhythmogenic Right Ventricular DysplasiaDiabetic CardiomyopathiesHeart TransplantationVentricular RemodelingHeart SeptumHeart AtriaHeart ArrestFibrosisMyocardial IschemiaTroponin TDisease Models, AnimalTachycardia, VentricularCardiac Output, LowCardiac Imaging TechniquesCalciumTroponin ITreatment OutcomeDogsSarcomeresHeart Function TestsHypertrophy, Left VentricularMyocardial InfarctionEndocardiumMice, TransgenicPatch-Clamp TechniquesMyoblasts, CardiacRats, Sprague-DawleyEchocardiography, DopplerCardiac VolumeCardiotonic AgentsVentricular FunctionMyosin Heavy ChainsVentricular MyosinsPacemaker, ArtificialFollow-Up StudiesEndomyocardial FibrosisDefibrillators, ImplantableMutationProspective StudiesCardiac GlycosidesBlood PressureHeart Defects, CongenitalHeart BlockVentricular Outflow ObstructionMembrane PotentialsCells, CulturedVentricular DysfunctionMagnetic Resonance Imaging, CineDiastoleOut-of-Hospital Cardiac ArrestCardiac Resynchronization Therapy