Atrial FlutterTricuspid ValveCatheter AblationElectrophysiologic Techniques, CardiacVenae CavaeHeart Conduction SystemVena Cava, InferiorHeart AtriaBody Surface Potential MappingCryosurgeryAtrial FibrillationElectrocardiographyRecurrenceTreatment OutcomeProspective StudiesPulmonary VeinsFallopian TubesSperm TransportFollow-Up StudiesMetencephalonOviductsHeart BlockOvum Transport