Tachycardia, VentricularTachycardiaElectrocardiographyTachycardia, SupraventricularCatheter AblationVentricular FibrillationAnti-Arrhythmia AgentsTachycardia, Atrioventricular Nodal ReentryArrhythmias, CardiacTachycardia, SinusHeart Conduction SystemElectrophysiologic Techniques, CardiacCardiac Pacing, ArtificialTachycardia, ParoxysmalBody Surface Potential MappingDefibrillators, ImplantableVentricular Premature ComplexesTachycardia, Ectopic AtrialEndocardiumAmiodaroneEpicardial MappingDeath, Sudden, CardiacElectrocardiography, AmbulatoryCardiac Complexes, PrematureHeart VentriclesBundle-Branch BlockProcainamideElectric CountershockFlecainideSyncopeArrhythmogenic Right Ventricular DysplasiaTachycardia, Ectopic JunctionalBundle of HisCardiomyopathiesFollow-Up StudiesElectrophysiologyPericardiumHeart RatePostural Orthostatic Tachycardia SyndromeSotalolTreatment OutcomeCalsequestrinMyocardial InfarctionTachycardia, ReciprocatingCryosurgeryTachycardia, Sinoatrial Nodal ReentryMexiletineCicatrixAtrioventricular NodeDeath, SuddenRecurrenceHeart BlockWolff-Parkinson-White SyndromeTime FactorsLong QT SyndromeCardiomyopathy, DilatedBrugada SyndromeTorsades de PointesHeart ArrestRyanodine Receptor Calcium Release ChannelRetrospective StudiesPropafenoneDogsAccelerated Idioventricular RhythmProspective StudiesEchocardiographyVerapamilPredictive Value of TestsHeartPurkinje FibersCardiomyopathy, HypertrophicCardiac ElectrophysiologyAtrial FlutterPre-Excitation SyndromesSignal Processing, Computer-AssistedAndersen SyndromeNAV1.5 Voltage-Gated Sodium ChannelRefractory Period, ElectrophysiologicalPacemaker, ArtificialAdrenergic beta-AntagonistsTetralogy of FallotSensitivity and SpecificityVentricular DysfunctionVentricular SeptumStroke VolumePrognosisAction PotentialsMyocardial IschemiaCardiac CatheterizationCatecholaminesBradycardiaVentricular Dysfunction, LeftHeart AneurysmHeart AtriaDisopyramideMyocardiumAtrial FibrillationAtrioventricular BlockRisk FactorsDigitalis Glycosides