Atrioventricular NodeTachycardia, Atrioventricular Nodal ReentryBundle of HisMyocardiumHeart Conduction SystemSinoatrial NodeHeart VentriclesHeart BlockCatheter AblationCardiac Pacing, ArtificialElectrocardiographyTachycardia, ParoxysmalHeartHeart AtriaLymph NodesElectrophysiologic Techniques, CardiacTachycardiaWolff-Parkinson-White SyndromeTachycardia, SupraventricularVentricular FunctionIsolated Noncompaction of the Ventricular MyocardiumDogsMyocardial ContractionAtrial FunctionTachycardia, Ectopic JunctionalHeart SeptumRabbitsAction PotentialsAtrial FibrillationRefractory Period, ElectrophysiologicalElectrocoagulationArrhythmias, CardiacSick Sinus SyndromePurkinje FibersPapillary MusclesElectrophysiologyModels, CardiovascularAnti-Arrhythmia AgentsAtrial FlutterUltimobranchial BodyHeart RateTachycardia, Ectopic AtrialTime FactorsConnexinsPacemaker, ArtificialVagus NerveBupranololMyocytes, CardiacRadio WavesAequorinAtrioventricular BlockPericardiumCardiomyopathiesMicroelectrodesFerretsBody Surface Potential MappingMyocardial StunningAdenosineElectric StimulationMyocardial IschemiaFollow-Up StudiesEndocardiumLymph Node ExcisionHeart NeoplasmsCardiomyopathy, DilatedCoronary CirculationCardiomegalyCardiotonic AgentsMyocardial InfarctionEchocardiographyTricuspid ValveHeart Defects, CongenitalHeart FailureSentinel Lymph Node BiopsyVentricular DysfunctionFetal HeartStimulation, ChemicalConnexin 43Membrane PotentialsCalciumEndocardial FibroelastosisMyocardial Reperfusion InjuryDepression, ChemicalTreatment OutcomeGuinea Pigs