Cardiac ElectrophysiologyArrhythmias, CardiacElectrophysiological ProcessesElectrophysiologic Techniques, CardiacModels, CardiovascularHeartEpicardial MappingMyocytes, CardiacHeart Conduction SystemElectrocardiographyElectrophysiologyElectrophysiological PhenomenaVoltage-Sensitive Dye ImagingAction PotentialsLong QT SyndromeHeart VentriclesAtrioventricular NodeCatheter AblationHeart RateMyocardiumDeath, Sudden, CardiacComputer SimulationAnti-Arrhythmia AgentsCardiac OutputArrhythmia, SinusPotassium ChannelsTachycardia, VentricularCardiac Pacing, ArtificialCardiac Surgical ProceduresVentricular FibrillationAtrial FibrillationElectrocardiography, AmbulatoryVentricular Premature ComplexesNAV1.5 Voltage-Gated Sodium ChannelTime FactorsHeart DiseasesTachycardiaHeart AtriaCardiac Complexes, PrematureMyocardial ContractionEther-A-Go-Go Potassium ChannelsAlgorithmsDogsCardiomegalyEncainideHeart ArrestPotassium Channels, Voltage-GatedSodium ChannelsHeart FailureTachycardia, SupraventricularTreatment OutcomeMyocardial InfarctionDeath, SuddenKCNQ1 Potassium ChannelCardiac CatheterizationPatch-Clamp TechniquesCardiomyopathiesBradycardiaAtrial FlutterEchocardiographyCardiac TamponadeCardiac Imaging TechniquesBody Surface Potential MappingVentricular FunctionMoricizineHeart BlockPericardiumCalciumDefibrillators, ImplantableMyocardial IschemiaDisease ManagementFlecainideKCNQ Potassium ChannelsFollow-Up StudiesProspective StudiesHemodynamicsDisease Models, AnimalRisk FactorsPacemaker, ArtificialDigitalis GlycosidesRetrospective StudiesAmiodaroneElectric CountershockMembrane PotentialsBlood PressureTorsades de PointesAtrial Premature ComplexesVentricular Function, LeftRats, Sprague-DawleyChlorofluorocarbons, MethaneTelemetryIon ChannelsAutonomic Nervous SystemSyncopeMyoblasts, CardiacIon Channel GatingRyanodine Receptor Calcium Release ChannelCalcium SignalingCardiotonic AgentsCardiomyopathy, Dilated