Death, SuddenAutopsyDeath, Sudden, CardiacCause of DeathSudden Infant DeathCell DeathArrhythmias, CardiacCardiomyopathy, HypertrophicElectrocardiographyTachycardia, VentricularFatal OutcomeVentricular FibrillationDeathLong QT SyndromeRisk FactorsForensic PathologyDefibrillators, ImplantableSyncopeElectrocardiography, AmbulatoryFollow-Up StudiesCardiomyopathiesRetrospective StudiesCoronary Vessel AnomaliesTime FactorsAnti-Arrhythmia AgentsAjmalineProspective StudiesInfant, NewbornSyndromeArrhythmogenic Right Ventricular DysplasiaHeart Conduction SystemMyocardial InfarctionHeart ArrestNAV1.5 Voltage-Gated Sodium ChannelSportsHeart DiseasesAbnormalities, MultipleFetal DeathHeart FailurePrognosisIncidenceBrugada SyndromeKCNQ1 Potassium ChannelCardiomyopathy, DilatedMyocardiumHeart BlockBundle-Branch BlockMutationCardiac Complexes, PrematureTachycardiaAmiodaroneRisk AssessmentEchocardiographySurvival AnalysisPedigreeTreatment OutcomeEther-A-Go-Go Potassium ChannelsMagnetic Resonance ImagingAge FactorsRiskHeart RateBrain DeathBrainPredictive Value of TestsPhenotypeCoronary DiseaseCohort StudiesPregnancyVentricular Premature ComplexesCongenital AbnormalitiesHeart VentriclesChromosome AberrationsHeartJapanDisease Models, AnimalMyocardial IschemiaTetralogy of FallotAttitude to DeathKCNQ Potassium ChannelsSurvival RateAthletesCoroners and Medical ExaminersAsphyxiaMandatory TestingCardiac Pacing, ArtificialPotassium Channels, Voltage-GatedTymoviridaeAdrenergic beta-AntagonistsAutonomic Nervous SystemCardiovascular AbnormalitiesThoracic InjuriesVentricular DysfunctionCase-Control StudiesAutonomic Nervous System DiseasesStroke VolumeLown-Ganong-Levine SyndromeTomography, X-Ray ComputedIsolated Noncompaction of the Ventricular MyocardiumHypertrophy, Left VentricularCardiomyopathy, Restrictive