Long QT SyndromeKCNQ1 Potassium ChannelEther-A-Go-Go Potassium ChannelsTorsades de PointesPotassium Channels, Voltage-GatedKCNQ Potassium ChannelsNAV1.5 Voltage-Gated Sodium ChannelRomano-Ward SyndromeSyndromeElectrocardiographyMexiletineSyncopeDeath, Sudden, CardiacArrhythmias, CardiacAnti-Arrhythmia AgentsSodium ChannelsMutationJervell-Lange Nielsen SyndromePotassium ChannelsCation Transport ProteinsHeart Conduction SystemChannelopathiesBrugada SyndromeMutation, MissenseAdrenergic beta-AntagonistsCisaprideBradycardiaSympathectomyHeart ArrestAstemizoleAction PotentialsPedigreeFlecainideSyndactylyGenetic TestingNadololPatch-Clamp TechniquesPhenotypeVentricular Premature ComplexesTachycardia, VentricularHeartAcetanilidesIon Channel GatingAtrioventricular BlockElectrocardiography, AmbulatoryHeart RateQuinidineMyocytes, CardiacElectrophysiologyGenotypeDefibrillators, ImplantablePotassium Channel BlockersDNA Mutational AnalysisDown SyndromeSodium Channel BlockersMetabolic Syndrome XBepridilDeath, SuddenHEK293 CellsModels, CardiovascularDelayed Rectifier Potassium ChannelsHeart VentriclesHeterozygoteGenetic Predisposition to DiseaseNicorandilMethoxamineSotalolChromosomes, Human, Pair 7Chromosomes, Human, Pair 11Cnidarian VenomsFamily HealthPropranololPolymorphism, Single-Stranded ConformationalVentricular FibrillationTrans-ActivatorsCardiac Pacing, ArtificialSudden Infant DeathMuscle ProteinsRisk FactorsRisk AssessmentToesXenopusUtahElectrophysiologic Techniques, CardiacProtein TransportMyocardiumInfant, NewbornFounder EffectPiperidinesEpinephrineNephrotic SyndromeMembrane PotentialsHypokalemiaPotassium