Refractory Period, ElectrophysiologicalHeart Conduction SystemAtrial FunctionHeart AtriaAtrioventricular NodeAnti-Arrhythmia AgentsCardiac Pacing, ArtificialAtrial FibrillationDogsElectrophysiologic Techniques, CardiacBundle of HisElectrocardiographySotalolAction PotentialsWolff-Parkinson-White SyndromeElectrophysiologyHeart BlockProcainamideFlecainideVentricular FunctionRefractory Period, PsychologicalTachycardia, Atrioventricular Nodal ReentryTachycardiaArrhythmias, CardiacQuinidineDisopyramideMexiletinePericardiumSinoatrial NodeTachycardia, ParoxysmalPropafenoneHeartVentricular FibrillationAmiodaroneAtrial Function, RightBepridilTachycardia, SupraventricularPapillary MusclesElectric StimulationCatheter AblationHeart VentriclesAccessory Atrioventricular BundleNeural ConductionAtrial FlutterHeart RatePhenethylaminesPulmonary VeinsTachycardia, VentricularVagus NerveCardiac Complexes, PrematureAporphinesElectrophysiological PhenomenaPacemaker, ArtificialTachycardia, Ectopic AtrialGuinea PigsElectric CountershockTime FactorsPurkinje FibersPotassium Channel BlockersLidocaineEndocardiumAutonomic Nervous SystemAtrial Function, LeftPericarditisMyocardial ContractionRabbitsDisease Models, AnimalSodium ChannelsVerapamilDose-Response Relationship, DrugSulfonamidesModels, CardiovascularPerfusionMyocardiumIsoproterenolSodium Channel BlockersMyocytes, CardiacGoatsPotassium ChannelsPropranololConnexin 43Adrenergic beta-AntagonistsModels, AnimalTreatment OutcomePotassiumMembrane PotentialsCalcium Channel BlockersAnemia, RefractoryBlood PressureChronic DiseaseAcetylcholineToesPatch-Clamp TechniquesMyocardial IschemiaMyocardial InfarctionEvoked PotentialsSchizophrenia, CatatonicVagus Nerve StimulationNervous System Physiological PhenomenaPeroneal Nerve