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 FibrillationElectrocoagulationAtrial FunctionSick Sinus SyndromeAtrial FlutterRefractory Period, ElectrophysiologicalHeart SeptumUltimobranchial BodyTachycardia, Ectopic AtrialRabbitsElectrophysiologyPacemaker, ArtificialVagus NerveRadio WavesAtrioventricular BlockAnti-Arrhythmia AgentsDogsPurkinje FibersHeart VentriclesArrhythmias, CardiacAction PotentialsHeart RateFollow-Up StudiesBody Surface Potential MappingConnexinsLymph Node ExcisionCranial Fossa, PosteriorHeart NeoplasmsMicroelectrodesModels, CardiovascularTime FactorsTricuspid ValveHeartTreatment OutcomeSentinel Lymph Node BiopsyMyocardiumAdenosine