Death, Sudden, CardiacDeath, SuddenArrhythmias, CardiacSurvival RateMyocytes, CardiacDefibrillators, ImplantableCell SurvivalTachycardia, VentricularElectrocardiographySudden Infant DeathVentricular FibrillationHeart ArrestLong QT SyndromeHeartCardiomyopathy, HypertrophicRisk FactorsCardiac OutputSurvival AnalysisBrugada SyndromeTime FactorsDefibrillatorsDisease-Free SurvivalHeart DiseasesTreatment OutcomeFollow-Up StudiesCardiomyopathiesHeart Conduction SystemElectric CountershockAnti-Arrhythmia AgentsCardiopulmonary ResuscitationMyocardial InfarctionRetrospective StudiesCardiac Surgical ProceduresSurvivalMyocardiumCardiac Pacing, ArtificialRisk AssessmentProspective StudiesHeart FailureHeart RateElectrocardiography, AmbulatoryNAV1.5 Voltage-Gated Sodium ChannelGraft SurvivalHeart VentriclesPredictive Value of TestsKaplan-Meier EstimateArrhythmogenic Right Ventricular DysplasiaSyncopeProportional Hazards ModelsPrognosisAutopsyEchocardiographyCardiomegalyCardiac ElectrophysiologyStroke VolumeRomano-Ward SyndromeCause of DeathKCNQ1 Potassium ChannelOut-of-Hospital Cardiac ArrestCardiomyopathy, DilatedVentricular Dysfunction, LeftElectrophysiologic Techniques, CardiacMyocardial IschemiaIncidenceMyocardial ContractionCoronary Vessel AnomaliesEther-A-Go-Go Potassium ChannelsAmiodaroneCardiomyopathy, Hypertrophic, FamilialAdrenergic beta-AntagonistsMultivariate AnalysisCardiac TamponadeCohort StudiesForensic PathologyAutonomic Nervous SystemVentricular Function, LeftDisease Models, AnimalDogsMutationCardiac CatheterizationHeart TransplantationCoronary DiseaseSportsAjmalineCoronary Artery DiseaseAthletesTroponin TModels, CardiovascularHypertrophy, Left VentricularEmergency Medical ServicesCase-Control StudiesRiskBundle-Branch BlockResuscitationUnited StatesHemodynamicsAge FactorsVentricular RemodelingTachycardiaFibrosis