Cardiac ElectrophysiologyElectrophysiological ProcessesElectrophysiologic Techniques, CardiacEpicardial MappingArrhythmias, CardiacModels, CardiovascularHeartMyocytes, CardiacHeart Conduction SystemElectrophysiologyVoltage-Sensitive Dye ImagingElectrophysiological PhenomenaElectrocardiographyAction PotentialsAtrioventricular NodeHeart VentriclesCardiac OutputComputer SimulationLong QT SyndromeCatheter AblationMyocardiumDeath, Sudden, CardiacHeart RateCell DeathCardiac Surgical ProceduresPotassium ChannelsCause of DeathCardiac Pacing, ArtificialAlgorithmsCardiomegalyDeathHeart DiseasesCardiac CatheterizationCardiac TamponadeMyocardial ContractionTime FactorsHeart ArrestHeart FailureHeart AtriaCardiomyopathiesMyoblasts, CardiacPatch-Clamp TechniquesMyocardial InfarctionEchocardiographyCardiac MyosinsCardiac Imaging TechniquesRats, Sprague-DawleyDogsCardiac GlycosidesCalciumHemodynamicsMembrane PotentialsCardiac Output, LowVentricular Function, LeftOut-of-Hospital Cardiac ArrestCells, CulturedTreatment OutcomeHeart TransplantationDisease Models, AnimalCardiac VolumeVentricular RemodelingTroponin IVentricular FunctionBlood PressureProspective StudiesHeart Defects, Congenital