Cardiac ElectrophysiologyElectrophysiological ProcessesEpicardial MappingElectrophysiologic Techniques, CardiacModels, CardiovascularArrhythmias, CardiacHeartElectrophysiologyHeart Conduction SystemVoltage-Sensitive Dye ImagingElectrophysiological PhenomenaMyocytes, CardiacAction PotentialsElectrocardiographyAtrioventricular NodeHeart VentriclesComputer SimulationCatheter AblationLong QT SyndromeMyocardiumHeart RatePotassium ChannelsSpecializationCardiac OutputAlgorithmsMedicineDeath, Sudden, CardiacCardiac Surgical ProceduresCardiac Pacing, ArtificialPatch-Clamp TechniquesNurse CliniciansTime FactorsReferral and ConsultationCardiomegalyCardiac CatheterizationHeart DiseasesHeart AtriaMyocardial ContractionMembrane Potentials