Cardiac ElectrophysiologyCardiac CatheterizationElectrophysiological ProcessesEpicardial MappingElectrophysiologic Techniques, CardiacModels, CardiovascularArrhythmias, CardiacHeartElectrophysiologyHeart Conduction SystemVoltage-Sensitive Dye ImagingElectrophysiological PhenomenaMyocytes, CardiacElectrocardiographyAction PotentialsAtrioventricular NodeHeart VentriclesComputer SimulationCatheter AblationLong QT SyndromeMyocardiumHeart RatePotassium ChannelsCardiac OutputAlgorithmsDeath, Sudden, CardiacCardiac Surgical ProceduresCardiac Pacing, ArtificialSensitivity and SpecificityPatch-Clamp TechniquesTime FactorsHeart DiseasesCardiomegalyHeart AtriaMyocardial ContractionDiagnostic ErrorsDiagnostic ImagingMembrane PotentialsCardiac Tamponade