Death, Sudden, CardiacArrhythmias, CardiacDeath, SuddenMyocytes, CardiacDefibrillators, ImplantableSudden Infant DeathTachycardia, VentricularElectrocardiographyVentricular FibrillationHeart ArrestLong QT SyndromeHeartCardiomyopathy, HypertrophicCardiac OutputBrugada SyndromeDefibrillatorsHeart DiseasesRisk FactorsHeart Conduction SystemCardiomyopathiesElectric CountershockAnti-Arrhythmia AgentsCardiac Surgical ProceduresMyocardial InfarctionCardiac Pacing, ArtificialMyocardiumCardiopulmonary ResuscitationElectrocardiography, AmbulatoryHeart RateHeart FailureNAV1.5 Voltage-Gated Sodium ChannelHeart VentriclesArrhythmogenic Right Ventricular DysplasiaRisk AssessmentSyncopeTime FactorsFollow-Up StudiesAutopsyProspective StudiesEchocardiographyCardiac ElectrophysiologyRomano-Ward SyndromeCardiomegalyPredictive Value of TestsKCNQ1 Potassium ChannelStroke VolumeElectrophysiologic Techniques, CardiacCardiomyopathy, DilatedVentricular Dysfunction, LeftCoronary Vessel AnomaliesMyocardial IschemiaMyocardial ContractionEther-A-Go-Go Potassium ChannelsOut-of-Hospital Cardiac ArrestCardiomyopathy, Hypertrophic, FamilialAmiodaroneTreatment OutcomeCause of DeathCardiac TamponadeForensic PathologyRetrospective StudiesAdrenergic beta-AntagonistsAutonomic Nervous SystemIncidenceVentricular Function, LeftCardiac CatheterizationSportsDogsAjmalineAthletesCoronary DiseaseCoronary Artery DiseasePrognosisTroponin TModels, CardiovascularHypertrophy, Left VentricularBundle-Branch BlockTachycardiaProportional Hazards ModelsVentricular RemodelingHemodynamicsEmergency Medical ServicesHeart TransplantationResuscitationHospitals, StateFibrosisSyndromeJervell-Lange Nielsen SyndromeChannelopathiesCase-Control StudiesRyanodine Receptor Calcium Release ChannelPacemaker, ArtificialVentricular DysfunctionHeart Function TestsRiskMyocardial BridgingDisease Models, AnimalOregonMyoblasts, CardiacCardiac Myosins