Atrial FlutterAtrial FibrillationCatheter AblationAtrioventricular NodeHeart BlockElectrocardiographyAnti-Arrhythmia AgentsCardiac Pacing, ArtificialPropafenoneTricuspid ValveHeart AtriaRefractory Period, ElectrophysiologicalHeart Conduction SystemElectric CountershockAmiodaroneTachycardia, SupraventricularTachycardiaPericarditisElectrophysiologic Techniques, CardiacProcainamideDigoxinAtrial FunctionTachycardia, ParoxysmalBody Surface Potential MappingParasympathectomyHeart RateAtrial Function, RightPacemaker, ArtificialVena Cava, InferiorDisopyramideFlecainideDogsMagnetocardiographyFetal DiseasesArrhythmias, CardiacElectrocardiography, AmbulatoryTreatment OutcomeAtrial Premature ComplexesElectrophysiologyCervical PlexusTachycardia, Atrioventricular Nodal ReentryHeart VentriclesTachycardia, Ectopic AtrialFollow-Up StudiesHydrops FetalisCryosurgeryWolff-Parkinson-White SyndromeDiltiazemPulmonary VeinsRecurrenceCoronary SinusFluoroscopyProspective StudiesBradycardiaCardiac CathetersVagus NerveButylscopolammonium BromideAtrial Function, LeftSick Sinus SyndromeTime FactorsTachycardia, Sinoatrial Nodal ReentryEchocardiography, TransesophagealMetoprololVenae CavaeEdrophoniumSotalolVentricular DysfunctionBundle of HisVentricular FunctionParasympatholyticsHeart DiseasesAtrial AppendageDysgeusiaAtrial SeptumHeart Defects, CongenitalSulfonamidesArrhythmia, SinusPostoperative ComplicationsSurgery, Computer-AssistedCardiac CatheterizationAzygos VeinAdrenergic beta-AntagonistsEchocardiographyElectric StimulationCardiac Output