Bundle-Branch BlockElectrocardiographyBundle of HisHeart Conduction SystemCardiac Pacing, ArtificialHeart BlockAjmalineCardiac Resynchronization TherapyVectorcardiographyPacemaker, ArtificialHeart SeptumTachycardia, VentricularAtrioventricular BlockCardiomyopathy, DilatedBrugada SyndromeElectrophysiologic Techniques, CardiacTachycardia, ReciprocatingSyncopeVentricular Dysfunction, LeftHeart VentriclesTachycardiaArrhythmias, CardiacProcainamideVentricular Premature ComplexesCatheter AblationVentricular Function, LeftHeart FailureEchocardiographyEchocardiography, DopplerVentricular DysfunctionPurkinje FibersCardiomyopathiesNerve BlockBody Surface Potential MappingVentricular Dysfunction, RightDefibrillators, ImplantableTreatment OutcomeDeath, Sudden, CardiacMyocardial InfarctionStroke VolumeAtrioventricular NodeSyndromeElectrocardiography, AmbulatoryVentricular FibrillationTachycardia, SupraventricularProspective StudiesFollow-Up StudiesPredictive Value of TestsCardiac CatheterizationTime FactorsPhonocardiographyVentricular Function, RightZygapophyseal JointAnti-Arrhythmia AgentsThallium RadioisotopesNAV1.5 Voltage-Gated Sodium ChannelExercise TestWolff-Parkinson-White SyndromeCardiac Resynchronization Therapy DevicesTomography, Emission-Computed, Single-PhotonTachycardia, Atrioventricular Nodal ReentryHeartModels, CardiovascularTetralogy of FallotRetrospective StudiesBradycardiaPrognosisArrhythmogenic Right Ventricular DysplasiaHeart Function TestsCoronary AngiographyIohexolHeart AtriaMyocardial ContractionDogsSensitivity and SpecificityTechnetium Tc 99m SestamibiMitral Valve InsufficiencyDipyridamoleHeart Valve Prosthesis ImplantationThrombolytic TherapyHeart Septal Defects, VentricularCardiomyopathy, HypertrophicSodium ChannelsVentricular RemodelingMyocardiumDobutamineHeart Valve ProsthesisElectrophysiologyEchocardiography, StressTachycardia, ParoxysmalSignal Processing, Computer-AssistedFalse Positive ReactionsAortic Valve StenosisVerapamilHeart RateCoronary DiseaseMyocardial IschemiaHemodynamicsObserver VariationMyocardial Reperfusion