Atrial FlutterCatheter AblationAtrial FibrillationCircadian RhythmTricuspid ValveElectrocardiographyAnti-Arrhythmia AgentsPropafenoneHeart AtriaHeart BlockPericarditisElectrophysiologic Techniques, CardiacElectric CountershockProcainamideHeart Conduction SystemCardiac Pacing, ArtificialBody Surface Potential MappingAtrial Function, RightTachycardia, SupraventricularVena Cava, InferiorDisopyramideFlecainideAmiodaroneAtrial FunctionTachycardiaRefractory Period, ElectrophysiologicalAtrial Premature ComplexesTachycardia, ParoxysmalTachycardia, Ectopic AtrialCryosurgeryHydrops FetalisElectrophysiologyPulmonary VeinsArrhythmias, CardiacRecurrenceAtrioventricular NodeTreatment OutcomeCoronary SinusFollow-Up StudiesFluoroscopyAtrial Function, LeftCardiac CathetersSick Sinus SyndromeButylscopolammonium BromideTachycardia, Sinoatrial Nodal ReentryElectrocardiography, AmbulatoryEchocardiography, TransesophagealFetal DiseasesSotalolBundle of HisTime FactorsProspective StudiesVenae CavaeDogsEdrophoniumDigoxinHeart DiseasesArrhythmia, SinusTachycardia, Atrioventricular Nodal ReentryPacemaker, ArtificialAtrial AppendageDysgeusiaAtrial SeptumHeart RateSulfonamidesPostoperative ComplicationsHeart Defects, CongenitalCardiac CatheterizationEchocardiographySurgery, Computer-AssistedAzygos VeinRetrospective StudiesEquipment DesignEndocardiumPeriodicity