Tachycardia, VentricularTachycardiaAnti-Arrhythmia AgentsDefibrillators, ImplantableVentricular FibrillationElectrocardiographyAmiodaroneArrhythmias, CardiacDeath, Sudden, CardiacTachycardia, SupraventricularCardiac Pacing, ArtificialElectrophysiologic Techniques, CardiacLong QT SyndromeHeart Conduction SystemElectrocardiography, AmbulatorySotalolTorsades de PointesBradycardiaCardiovascular DeconditioningElectric CountershockTachycardia, Ectopic AtrialBepridilVentricular Premature ComplexesPyrimidinonesMexiletineCardiac Complexes, PrematureSyncopeRefractory Period, ElectrophysiologicalFollow-Up StudiesElectrophysiologyQuinolinium CompoundsRecurrenceProcainamideHeart RateDogsCardiomyopathiesMyocardial InfarctionHeart VentriclesVentricular DysfunctionAtrial FlutterCatheter AblationBrugada SyndromeAction PotentialsTreatment OutcomeHeart ArrestConnexin 43Bundle-Branch BlockTime FactorsHeartStroke VolumeModels, CardiovascularAtrial FibrillationAlkanesTricuspid AtresiaHeart FailureAdrenergic beta-AntagonistsPacemaker, ArtificialTachycardia, ParoxysmalHeart AtriaVentricular Dysfunction, LeftProspective StudiesCardiomyopathy, HypertrophicCardiomyopathy, DilatedRetrospective StudiesMyocytes, CardiacRisk FactorsMyocardial IschemiaDisease SusceptibilityDisease Models, AnimalPredictive Value of TestsCardiac ElectrophysiologySympathetic Nervous SystemMyocardiumSurvival RateArrhythmia, SinusHeart BlockIncidenceFlecainideTachycardia, Ectopic JunctionalCoronary DiseasePropafenonePulmonary VeinsRisk AssessmentRabbitsSensitivity and SpecificitySick Sinus SyndromeTachycardia, SinusBody Surface Potential MappingFontan ProcedureAtrial RemodelingTachycardia, Atrioventricular Nodal ReentryDose-Response Relationship, DrugTachycardia, Sinoatrial Nodal ReentryAdrenergic alpha-2 Receptor AgonistsEructationDexmedetomidineAtrioventricular NodeAtrial SeptumPericardiumAtrial Function