Atrioventricular NodeSinoatrial NodeTachycardia, Atrioventricular Nodal ReentryBundle of HisHeart Conduction SystemSick Sinus SyndromeLymph NodesHeart BlockCardiac Pacing, ArtificialCatheter AblationElectrocardiographyTachycardia, ParoxysmalElectrophysiologic Techniques, CardiacHeart AtriaTachycardiaSinoatrial BlockTachycardia, SupraventricularArrhythmia, SinusWolff-Parkinson-White SyndromePacemaker, ArtificialAtrial FibrillationAtrial FunctionTachycardia, SinusCranial SinusesMaxillary SinusTachycardia, Ectopic JunctionalHeart RateRefractory Period, ElectrophysiologicalArrhythmias, CardiacAtrioventricular BlockParanasal SinusesAtrial FlutterBradycardiaElectrocoagulationCavernous SinusSinus of ValsalvaDogsLymph Node ExcisionElectrophysiologyAnti-Arrhythmia AgentsVagus NerveRabbitsCarotid SinusSentinel Lymph Node BiopsyAction PotentialsHeart SeptumFrontal SinusTachycardia, Ectopic AtrialUltimobranchial BodyParanasal Sinus DiseasesSphenoid SinusPurkinje FibersHeart VentriclesBody Surface Potential MappingHeartCoronary SinusRadio WavesFollow-Up StudiesConnexinsTime FactorsLymphatic MetastasisModels, CardiovascularSinus Arrest, CardiacMicroelectrodesAtrial SeptumSinus Thrombosis, IntracranialAtropineTreatment OutcomeMyocardiumEthmoid SinusHeart NeoplasmsTricuspid ValveRanvier's NodesParanasal Sinus NeoplasmsMitochondrial SizeElectric StimulationRetrospective StudiesAdenosineAutonomic Nerve BlockSyncope