Neural ConductionAtrioventricular NodeHeart Conduction SystemHeart BlockBundle of HisAtrioventricular BlockElectrocardiographySick Sinus SyndromeSinoatrial NodePacemaker, ArtificialWolff-Parkinson-White SyndromeCardiac Pacing, ArtificialArrhythmias, CardiacBradycardiaHeart AtriaTachycardia, SupraventricularAtrial FlutterSinoatrial BlockAtrial FunctionElectrophysiologic Techniques, CardiacTachycardiaHeartHeart RateConnexinsElectrophysiologyBundle-Branch BlockCardiac Complexes, PrematureAtrial FibrillationDogsCatheter AblationHeart VentriclesTachycardia, Atrioventricular Nodal ReentryFetal DiseasesVagus NerveAnti-Arrhythmia AgentsVerapamilHalothaneAction PotentialsBone ConductionEnfluraneVentricular FunctionMedian NerveTime FactorsMyocardiumGuinea PigsCardiac CatheterizationRefractory Period, ElectrophysiologicalUlnar NerveEchocardiographyMyocardial ContractionPeripheral NervesIsofluraneTibial NerveAphasia, ConductionAxonsElectrodiagnosisAdenosineSural NervePurkinje FibersPeripheral Nervous System Diseases