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Arrhythmias, CardiacSyndromeCardiac ElectrophysiologyElectrophysiologyArrhythmia, SinusElectrocardiographyElectrophysiologic Techniques, CardiacTachycardia, VentricularHealth Services AccessibilityHealth ServicesElectrophysiological PhenomenaAnti-Arrhythmia AgentsHeart Conduction SystemHealth Services Needs and DemandElectrophysiological ProcessesLong QT SyndromeVentricular FibrillationMental Health ServicesAction PotentialsDown SyndromeFamily Planning ServicesMetabolic Syndrome XHome Care ServicesVentricular Premature ComplexesCatheter AblationAtrial FibrillationTachycardia, SupraventricularHealth Services ResearchTachycardiaTime FactorsCommunity Health ServicesHeartDeath, Sudden, CardiacElectrocardiography, AmbulatoryHeart AtriaModels, CardiovascularCardiac Pacing, ArtificialPatch-Clamp TechniquesHeart RateVoltage-Sensitive Dye ImagingRural Health ServicesHeart VentriclesNephrotic SyndromeNAV1.5 Voltage-Gated Sodium ChannelAtrial FlutterHealth Services for the AgedMyocytes, CardiacChild Health ServicesCardiac Complexes, PrematureDogsDefibrillators, ImplantablePreventive Health ServicesSjogren's SyndromeBody Surface Potential MappingReproductive Health ServicesAtrioventricular NodeEmergency Medical ServicesUnited StatesMaternal Health ServicesCommunity Mental Health ServicesMembrane PotentialsTreatment OutcomeSodium ChannelsWolff-Parkinson-White SyndromeEther-A-Go-Go Potassium ChannelsMyocardiumRisk FactorsRetrospective StudiesElectric CountershockHeart BlockFollow-Up StudiesTorsades de PointesTurner SyndromeAdolescent Health ServicesLibrary ServicesContract ServicesVentricular DysfunctionMutationDiagnostic ServicesDisease Models, AnimalPotassium Channels, Voltage-GatedProspective StudiesNursing ServicesAbnormalities, MultipleAtrial FunctionPacemaker, ArtificialMyelodysplastic SyndromesAmiodaroneDelivery of Health CareFlecainideHealth Services AdministrationUrban Health ServicesPotassium ChannelsRefractory Period, ElectrophysiologicalPericardiumSyncopeMyocardial InfarctionCushing SyndromeAcute Coronary SyndromeNeurons