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Arrhythmias, CardiacCardiac ElectrophysiologyElectrophysiologyElectrocardiographyElectrocardiography, AmbulatoryTachycardia, SupraventricularArrhythmia, SinusSyncopeTachycardia, VentricularAnti-Arrhythmia AgentsVentricular Premature ComplexesTachycardiaCatheter AblationHeart Conduction SystemDizzinessAtrial FibrillationElectrophysiologic Techniques, CardiacHealth Services AccessibilityTachycardia, ParoxysmalHealth ServicesElectrophysiological PhenomenaAtrioventricular NodeDeath, Sudden, CardiacHealth Services Needs and DemandTachycardia, SinusElectrophysiological ProcessesAtrial Premature ComplexesMental Health ServicesTachycardia, Atrioventricular Nodal ReentryVentricular FibrillationAction PotentialsFamily Planning ServicesWolff-Parkinson-White SyndromeCardiac Pacing, ArtificialHeart AtriaHeart RateDefibrillators, ImplantableHome Care ServicesHeart VentriclesTime FactorsHeart SoundsHeart BlockHealth Services ResearchCommunity Health ServicesSick Sinus SyndromeHeartModels, CardiovascularLong QT SyndromeTreatment OutcomePheochromocytomaPatch-Clamp TechniquesVoltage-Sensitive Dye ImagingRural Health ServicesEchocardiographyDyspneaMedical History TakingFollow-Up StudiesAtrial FlutterHealth Services for the AgedParagangliomaChild Health ServicesMyocytes, CardiacReproductive Health ServicesPreventive Health ServicesCardiac Complexes, PrematureProspective StudiesHeart NeoplasmsTilt-Table TestBody Surface Potential MappingThyroiditis, SubacuteDiscriminant AnalysisChest PainRetrospective StudiesDogsHeart DiseasesMaternal Health ServicesAdrenal Gland NeoplasmsEmergency Medical ServicesNAV1.5 Voltage-Gated Sodium ChannelCommunity Mental Health ServicesHeadacheMembrane PotentialsAmbulatory CareUnited StatesElectric CountershockCardiac Surgical ProceduresMyocardiumQuestionnairesSodium ChannelsAdolescent Health ServicesLibrary ServicesContract ServicesEther-A-Go-Go Potassium ChannelsBundle-Branch BlockTorsades de PointesVentricular DysfunctionDiagnostic ServicesRisk FactorsPredictive Value of TestsNursing Services