Bundle-Branch BlockElectrocardiographyBundle of HisHeart Conduction SystemCardiac Pacing, ArtificialHeart BlockAjmalineCardiac Resynchronization TherapyVectorcardiographyPacemaker, ArtificialHeart SeptumTachycardia, VentricularAtrioventricular BlockCardiomyopathy, DilatedBrugada SyndromeTachycardia, ReciprocatingElectrophysiologic Techniques, CardiacSyncopeVentricular Dysfunction, LeftHeart VentriclesTachycardiaArrhythmias, CardiacProcainamideVentricular Premature ComplexesCatheter AblationHeart FailureVentricular Function, LeftEchocardiographyTreatment OutcomePurkinje FibersVentricular DysfunctionEchocardiography, DopplerNerve BlockCardiomyopathiesDeath, Sudden, CardiacDefibrillators, ImplantableBody Surface Potential MappingSyndromeMyocardial InfarctionAtrioventricular NodeProspective StudiesStroke VolumeFollow-Up StudiesElectrocardiography, AmbulatoryVentricular FibrillationPredictive Value of TestsTime FactorsTachycardia, SupraventricularZygapophyseal JointPhonocardiographyExercise TestCardiac CatheterizationThallium RadioisotopesAnti-Arrhythmia AgentsNAV1.5 Voltage-Gated Sodium ChannelWolff-Parkinson-White SyndromeCardiac Resynchronization Therapy DevicesRetrospective StudiesTomography, Emission-Computed, Single-PhotonTachycardia, Atrioventricular Nodal ReentryPrognosisModels, CardiovascularHeartBradycardiaVentricular Dysfunction, RightTetralogy of FallotHeart Function TestsCoronary AngiographySensitivity and SpecificityIohexolTechnetium Tc 99m SestamibiMitral Valve InsufficiencyMyocardial ContractionThrombolytic TherapyDipyridamoleDogsArrhythmogenic Right Ventricular DysplasiaHeart Valve Prosthesis ImplantationCardiomyopathy, HypertrophicSodium ChannelsHeart Septal Defects, VentricularHeart AtriaRisk FactorsVentricular RemodelingDobutamineHeart Valve ProsthesisHeart RateEchocardiography, StressMyocardiumElectrophysiologyFalse Positive ReactionsTachycardia, ParoxysmalAortic Valve StenosisIncidenceCoronary DiseaseSignal Processing, Computer-AssistedVerapamilReproducibility of ResultsMultivariate AnalysisMyocardial Ischemia