Atrial FlutterAtrioventricular NodeHeart Conduction SystemHeart BlockCatheter AblationElectrocardiographyNeural ConductionBundle of HisAtrial FibrillationHeart AtriaCardiac Pacing, ArtificialTricuspid ValveElectrophysiologic Techniques, CardiacAtrioventricular BlockAnti-Arrhythmia AgentsTachycardia, SupraventricularPropafenoneSick Sinus SyndromePericarditisProcainamideAtrial FunctionTachycardiaElectric CountershockArrhythmias, CardiacBody Surface Potential MappingPacemaker, ArtificialSinoatrial NodeWolff-Parkinson-White SyndromeAtrial Function, RightElectrophysiologyRefractory Period, ElectrophysiologicalDisopyramideFlecainideVena Cava, InferiorAmiodaroneDogsFetal DiseasesBradycardiaTachycardia, ParoxysmalAtrial Premature ComplexesHeart RateTachycardia, Atrioventricular Nodal ReentryTachycardia, Ectopic AtrialFollow-Up StudiesTreatment OutcomeCryosurgeryHeartHydrops FetalisPulmonary VeinsTime FactorsCardiac CatheterizationSinoatrial BlockCoronary SinusRecurrenceEchocardiographyCardiac Complexes, PrematureFluoroscopyHeart VentriclesTachycardia, Sinoatrial Nodal ReentryConnexinsAtrial Function, LeftBundle-Branch BlockAction PotentialsVagus NerveCardiac CathetersButylscopolammonium BromideElectrocardiography, AmbulatoryVenae CavaeSotalolEchocardiography, TransesophagealProspective StudiesHeart DiseasesAtrial AppendageEdrophoniumVerapamilArrhythmia, SinusDigoxinAtrial SeptumEndocardiumMyocardiumHalothaneHeart Defects, CongenitalPostoperative ComplicationsBone ConductionSulfonamidesEnfluraneDysgeusiaVentricular FunctionMedian NerveSurgery, Computer-AssistedAzygos VeinRetrospective StudiesElectrodesEquipment DesignGuinea PigsHeart Septal Defects, Atrial