Cardiac ElectrophysiologyElectrophysiologic Techniques, CardiacDefibrillators, ImplantableElectrophysiological ProcessesCatheter AblationEpicardial MappingModels, CardiovascularArrhythmias, CardiacHeartMyocytes, CardiacHeart Conduction SystemElectrophysiologyVoltage-Sensitive Dye ImagingElectrophysiological PhenomenaElectrocardiographyAction PotentialsAtrioventricular NodeHeart VentriclesCardiac OutputComputer SimulationLong QT SyndromeMyocardiumHeart RateCardiac Surgical ProceduresDeath, Sudden, CardiacPotassium ChannelsCardiac Pacing, ArtificialAlgorithmsCardiomegalyHeart DiseasesCardiac CatheterizationCardiac TamponadeMyocardial ContractionHeart ArrestTime FactorsHeart FailureHeart Atria