Atrial FlutterTricuspid ValveCatheter AblationElectrophysiologic Techniques, CardiacVenae CavaeHeart AtriaHeart Conduction SystemAtrial FibrillationVena Cava, InferiorElectrocardiographyBody Surface Potential MappingCryosurgeryRecurrenceTreatment OutcomeProspective StudiesHeart BlockAnti-Arrhythmia AgentsPropafenonePulmonary VeinsPericarditisProcainamideCardiac Pacing, ArtificialElectric CountershockAtrial Function, RightTachycardia, SupraventricularFollow-Up StudiesDisopyramideFlecainideTachycardiaTachycardia, Ectopic AtrialAmiodaroneAtrial Premature ComplexesAtrial FunctionRefractory Period, ElectrophysiologicalCoronary SinusTachycardia, ParoxysmalFallopian TubesHydrops FetalisElectrophysiologyFluoroscopyArrhythmias, CardiacAtrioventricular Node