Bundle-Branch BlockElectrocardiographyBundle of HisHeart Conduction SystemCardiac Pacing, ArtificialHeart BlockAjmalineCardiac Resynchronization TherapyVectorcardiographyPacemaker, ArtificialHeart SeptumTachycardia, VentricularAtrioventricular BlockCardiomyopathy, DilatedBrugada SyndromeTachycardia, ReciprocatingElectrophysiologic Techniques, CardiacSyncopeVentricular Dysfunction, LeftHeart VentriclesTachycardiaProcainamideArrhythmias, CardiacVentricular Premature ComplexesCatheter AblationVentricular Function, LeftHeart FailureEchocardiographyPurkinje FibersVentricular DysfunctionEchocardiography, DopplerNerve BlockCardiomyopathiesDeath, Sudden, CardiacDefibrillators, ImplantableBody Surface Potential MappingAtrioventricular NodeMyocardial InfarctionTreatment OutcomeSyndromeStroke VolumeElectrocardiography, AmbulatoryVentricular FibrillationTachycardia, SupraventricularProspective StudiesPredictive Value of TestsFollow-Up StudiesPhonocardiographyZygapophyseal JointThallium RadioisotopesCardiac CatheterizationTime FactorsAnti-Arrhythmia AgentsNAV1.5 Voltage-Gated Sodium ChannelExercise TestWolff-Parkinson-White SyndromeCardiac Resynchronization Therapy DevicesTachycardia, Atrioventricular Nodal ReentryTomography, Emission-Computed, Single-PhotonModels, CardiovascularHeartBradycardiaPrognosisVentricular Dysfunction, RightRetrospective StudiesTetralogy of FallotHeart Function TestsIohexolCoronary AngiographyTechnetium Tc 99m SestamibiSensitivity and SpecificityMitral Valve InsufficiencyMyocardial ContractionDipyridamoleArrhythmogenic Right Ventricular DysplasiaDogsThrombolytic TherapyHeart Valve Prosthesis ImplantationSodium ChannelsCardiomyopathy, HypertrophicHeart Septal Defects, VentricularHeart AtriaVentricular RemodelingDobutamineHeart Valve ProsthesisEchocardiography, StressMyocardiumElectrophysiologyHeart RateFalse Positive ReactionsTachycardia, ParoxysmalVerapamilAortic Valve StenosisSignal Processing, Computer-AssistedCoronary DiseaseVentricular Function, RightMyocardial IschemiaMyocardial ReperfusionObserver VariationRisk Factors