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Arrhythmias, CardiacCardiac ElectrophysiologyElectrophysiologyArrhythmia, SinusElectrocardiographyElectrophysiologic Techniques, CardiacHealth Services AccessibilityTachycardia, VentricularHealth ServicesElectrophysiological PhenomenaAnti-Arrhythmia AgentsHeart Conduction SystemHealth Services Needs and DemandElectrophysiological ProcessesMental Health ServicesVentricular FibrillationAction PotentialsFamily Planning ServicesHome Care ServicesVentricular Premature ComplexesCatheter AblationAtrial FibrillationTachycardia, SupraventricularHealth Services ResearchTachycardiaCommunity Health ServicesHeartModels, CardiovascularElectrocardiography, AmbulatoryLong QT SyndromeHeart AtriaCardiac Pacing, ArtificialDeath, Sudden, CardiacPatch-Clamp TechniquesVoltage-Sensitive Dye ImagingRural Health ServicesHeart RateHeart VentriclesAtrial FlutterTime FactorsHealth Services for the AgedChild Health ServicesMyocytes, CardiacReproductive Health ServicesPreventive Health ServicesCardiac Complexes, PrematureBody Surface Potential MappingDefibrillators, ImplantableAtrioventricular NodeDogsMaternal Health ServicesEmergency Medical ServicesNAV1.5 Voltage-Gated Sodium ChannelCommunity Mental Health ServicesMembrane PotentialsUnited StatesElectric CountershockMyocardiumSodium ChannelsAdolescent Health ServicesLibrary ServicesContract ServicesEther-A-Go-Go Potassium ChannelsHeart BlockTorsades de PointesVentricular DysfunctionDiagnostic ServicesNursing ServicesAtrial FunctionDelivery of Health CarePotassium Channels, Voltage-GatedHealth Services AdministrationUrban Health ServicesAmiodaroneRefractory Period, ElectrophysiologicalPacemaker, ArtificialFlecainidePotassium ChannelsWomen's Health ServicesState MedicineEpicardial MappingPericardiumIon ChannelsGenetic ServicesBundle of HisTelemetryUnited States Dept. of Health and Human ServicesTachycardia, Ectopic AtrialNeuronsVentricular FunctionTreatment OutcomeRetrospective StudiesAccessory Atrioventricular BundleCalciumFollow-Up StudiesSyncopeDental Health ServicesCenters for Medicare and Medicaid Services (U.S.)Myocardial InfarctionEmergency Service, Hospital