Arrhythmias, CardiacArrhythmia, SinusElectrocardiographyTachycardia, VentricularAnti-Arrhythmia AgentsVentricular FibrillationVentricular Premature ComplexesHeart Conduction SystemTachycardiaElectrocardiography, AmbulatoryCardiac Complexes, PrematureDeath, Sudden, CardiacLong QT SyndromeAtrial FibrillationTachycardia, SupraventricularHeart RateElectrophysiologic Techniques, CardiacAtrial FlutterDefibrillators, ImplantableCatheter AblationHeart VentriclesHeartCardiac Pacing, ArtificialFlecainideVentricular DysfunctionTorsades de PointesNAV1.5 Voltage-Gated Sodium ChannelDogsElectric CountershockAmiodaroneAction PotentialsMyocardiumHeart AtriaMyocytes, CardiacDigitalis GlycosidesMyocardial IschemiaBradycardiaModels, CardiovascularAconitineMyocardial InfarctionDeath, SuddenTime FactorsAtrial Premature ComplexesBody Surface Potential MappingPropafenoneMyocardial Reperfusion InjuryHeart BlockEther-A-Go-Go Potassium ChannelsEncainideElectrophysiologyVoltage-Sensitive Dye ImagingTelemetryFollow-Up StudiesSyncopePericardiumCardiac ElectrophysiologyTachycardia, Ectopic AtrialCardiomyopathiesTetralogy of FallotSodium ChannelsProcainamidePacemaker, ArtificialConnexin 43MexiletineQuinidineSotalolTreatment OutcomeDisopyramideAtrioventricular BlockTachycardia, SinusAdrenergic beta-AntagonistsArrhythmogenic Right Ventricular DysplasiaAutonomic Nervous SystemHeart FailurePotassium Channels, Voltage-GatedMyocardial ContractionEpinephrineRisk FactorsHeart DiseasesEchocardiographyKCNQ1 Potassium ChannelRefractory Period, ElectrophysiologicalLidocaineAtrioventricular NodeWolff-Parkinson-White SyndromeEpicardial MappingCardiomyopathy, DilatedHeart ArrestVentricular FunctionDisease Models, AnimalSignal Processing, Computer-AssistedProspective StudiesMoricizineEndocardiumPulmonary VeinsAcetanilidesPostoperative ComplicationsPotassium ChannelsPurkinje FibersDigitalis