Atrioventricular NodeHeart AtriaTachycardia, Atrioventricular Nodal ReentryBundle of HisHeart Conduction SystemSinoatrial NodeCatheter AblationHeart BlockCardiac Pacing, ArtificialElectrocardiographyElectrophysiologic Techniques, CardiacAtrial FunctionTachycardia, ParoxysmalTachycardiaLymph NodesTachycardia, SupraventricularWolff-Parkinson-White SyndromeAtrial FibrillationAtrial Function, RightAtrial FlutterHeart NeoplasmsTachycardia, Ectopic JunctionalRefractory Period, ElectrophysiologicalSick Sinus SyndromeDogsHeart SeptumTachycardia, Ectopic AtrialElectrocoagulationPacemaker, ArtificialHeartElectrophysiologyHeart RateHeart VentriclesBody Surface Potential MappingVagus NerveAnti-Arrhythmia AgentsRabbitsAction PotentialsArrhythmias, CardiacUltimobranchial BodyAtrioventricular BlockTricuspid ValveVena Cava, SuperiorRadio WavesPurkinje FibersMyocardiumFollow-Up StudiesModels, CardiovascularVena Cava, InferiorThiocyanatesTime FactorsTreatment OutcomeLymph Node ExcisionVentricular Function, RightMicroelectrodesVentricular FunctionAdenosineFistulaElectric StimulationAtropinePulmonary VeinsEchocardiography, TransesophagealMyxomaMyocardial ContractionSentinel Lymph Node BiopsySinus of ValsalvaVentricular Dysfunction, RightEchocardiography