Atrioventricular NodeTachycardia, Atrioventricular Nodal ReentryBundle of HisHeart Conduction SystemSinoatrial NodeHeart BlockCatheter AblationCardiac Pacing, ArtificialTachycardia, ParoxysmalElectrocardiographyLymph NodesElectrophysiologic Techniques, CardiacTachycardiaWolff-Parkinson-White SyndromeTachycardia, SupraventricularHeart AtriaTachycardia, Ectopic JunctionalAtrial FunctionAtrial FibrillationElectrocoagulationSick Sinus SyndromeAtrial FlutterHeart SeptumRefractory Period, ElectrophysiologicalUltimobranchial BodyTachycardia, Ectopic AtrialRabbitsElectrophysiologyPacemaker, ArtificialVagus NerveRadio WavesAtrioventricular BlockAnti-Arrhythmia AgentsPurkinje FibersDogsArrhythmias, CardiacHeart VentriclesAction PotentialsHeart RateConnexinsBody Surface Potential MappingLymph Node ExcisionFollow-Up StudiesMicroelectrodesModels, CardiovascularHeart NeoplasmsHeartTricuspid ValveTime FactorsMyocardiumSentinel Lymph Node BiopsyAdenosineTreatment Outcome