HyperkalemiaArrhythmias, CardiacHypoaldosteronismElectrocardiographyPseudohypoaldosteronismMyocytes, CardiacArrhythmia, SinusAnti-Arrhythmia AgentsPotassiumHeart Conduction SystemDeath, Sudden, CardiacHeartLong QT SyndromeTachycardia, VentricularHypokalemiaVentricular FibrillationVentricular Premature ComplexesFludrocortisoneElectrocardiography, AmbulatoryCardiac Complexes, PrematureSpironolactoneTachycardiaHeart RateAtrial FibrillationEncainideNAV1.5 Voltage-Gated Sodium ChannelMyocardiumHeart VentriclesCardiac OutputCardiac Pacing, ArtificialMineralocorticoid Receptor AntagonistsEther-A-Go-Go Potassium ChannelsDogsCardiac Surgical ProceduresModels, CardiovascularDeath, SuddenTime FactorsPotassium Channels, Voltage-GatedHeart FailureMoricizineCardiac ElectrophysiologyBradycardiaKCNQ1 Potassium ChannelHeart DiseasesAction PotentialsFlecainideCatheter AblationMyocardial IschemiaSodium ChannelsAtrial FlutterAcidosisHeart AtriaElectrophysiologic Techniques, CardiacSodium BicarbonateTachycardia, SupraventricularMyocardial ContractionDigitalis GlycosidesAtrial Premature ComplexesHeart ArrestChlorofluorocarbons, MethaneAldosteroneMyocardial InfarctionTreatment OutcomeFollow-Up StudiesKCNQ Potassium ChannelsAmiodaroneRisk FactorsCation Exchange ResinsTorsades de PointesPotassium, DietaryCardiomyopathiesCardiomegalyBlood PressureDefibrillators, ImplantableSodium Chloride SymportersElectrophysiologyAconitineRetrospective StudiesCardiac Imaging TechniquesPotassium ChannelsAngiotensin-Converting Enzyme InhibitorsCatharticsHeart BlockEchocardiographyDisease Models, AnimalPericardiumBody Surface Potential MappingAndersen SyndromeProspective StudiesElectric CountershockAdrenergic beta-AntagonistsCalciumVentricular FunctionSodiumTelemetrySuccinylcholineRyanodine Receptor Calcium Release ChannelPolystyrenesAutonomic Nervous SystemLisinopril