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 FibrillationAtrial FunctionElectrocoagulationSick Sinus SyndromeAtrial FlutterRefractory Period, ElectrophysiologicalUltimobranchial BodyHeart SeptumTachycardia, Ectopic AtrialRabbitsElectrophysiologyPacemaker, ArtificialVagus NerveRadio WavesAtrioventricular BlockAnti-Arrhythmia AgentsPurkinje FibersDogsArrhythmias, CardiacHeart VentriclesAction PotentialsHeart RateConnexinsBody Surface Potential MappingLymph Node ExcisionFollow-Up StudiesHeart NeoplasmsMicroelectrodesModels, CardiovascularTricuspid ValveHeartSentinel Lymph Node BiopsyMyocardiumTime FactorsAdenosine