Arrhythmias, CardiacElectrocardiographyElectrocardiography, AmbulatoryHeartMyocytes, CardiacDeath, Sudden, CardiacHeart Conduction SystemAnti-Arrhythmia AgentsArrhythmia, SinusLong QT SyndromeTachycardia, VentricularHeart RateVentricular Premature ComplexesEchocardiographyAtrial FibrillationVentricular FibrillationTachycardiaExercise TestHeart VentriclesMyocardial InfarctionMyocardiumHeart DiseasesCardiac Pacing, ArtificialBradycardiaCardiac Complexes, PrematureDeath, SuddenModels, CardiovascularEncainideNAV1.5 Voltage-Gated Sodium ChannelMyocardial IschemiaTachycardia, SupraventricularMagnetocardiographyCardiac Surgical ProceduresCardiomyopathiesSignal Processing, Computer-AssistedHeart BlockTime FactorsCardiac OutputHeart AtriaEther-A-Go-Go Potassium ChannelsDogsProspective StudiesTelemetryMyocardial ContractionCatheter AblationPredictive Value of TestsAction PotentialsHeart FailureVectorcardiographySyncopePotassium Channels, Voltage-GatedMoricizineCardiac ElectrophysiologyKCNQ1 Potassium ChannelFollow-Up StudiesBody Surface Potential MappingFlecainideRisk FactorsHypertrophy, Left VentricularSodium ChannelsCoronary DiseaseAtrial FlutterAutonomic Nervous SystemDefibrillators, ImplantableElectrophysiologic Techniques, CardiacMonitoring, PhysiologicTreatment OutcomeDigitalis GlycosidesAtrial Premature ComplexesHeart ArrestCardiologyVentricular Function, LeftChlorofluorocarbons, MethanePacemaker, ArtificialCardiac CatheterizationChest PainCardiomyopathy, DilatedBrugada SyndromeBlood PressureVentricular FunctionCardiotonic AgentsKCNQ Potassium ChannelsAmiodaroneSensitivity and SpecificityHemodynamicsPrognosisTorsades de PointesCoronary AngiographyCardiomegalyTachycardia, SinusVentricular Dysfunction, LeftElectrophysiologyHeart AuscultationHypokalemiaRetrospective StudiesAconitineCardiac Imaging TechniquesPotassium ChannelsAtrioventricular NodeHeart Function Tests