Atrial FlutterArrhythmias, CardiacCatheter AblationAtrial FibrillationHeart AtriaElectrocardiographyAnti-Arrhythmia AgentsPropafenoneElectrophysiologic Techniques, CardiacHeart Conduction SystemTachycardia, Ectopic AtrialCardiac Pacing, ArtificialTachycardia, SupraventricularTricuspid ValveElectric CountershockArrhythmia, SinusHeart BlockBody Surface Potential MappingTachycardiaAtrial FunctionPericarditisProcainamideFlecainidePulmonary VeinsAtrial Premature ComplexesDisopyramideSick Sinus SyndromeRefractory Period, ElectrophysiologicalElectrocardiography, AmbulatoryAtrial Function, RightPacemaker, ArtificialAmiodaroneTachycardia, SinusTreatment OutcomeFollow-Up StudiesVena Cava, InferiorDogsElectrophysiologyTachycardia, VentricularRecurrenceAtrioventricular NodeAtrial AppendageSinoatrial NodeSotalolTachycardia, ParoxysmalTime FactorsHeart RateHeart Septal Defects, AtrialEchocardiographyCryosurgeryEchocardiography, TransesophagealAtrial Function, LeftHeart DiseasesAtrial RemodelingBradycardiaHydrops FetalisProspective StudiesHeart Defects, CongenitalCardiac ElectrophysiologyPostoperative ComplicationsHeartCardiac CatheterizationCoronary SinusMagnetocardiographyFluoroscopyRetrospective StudiesSinoatrial BlockCardiac Surgical ProceduresAction PotentialsButylscopolammonium BromideStellate GanglionVentricular Function, LeftCardiac CathetersVentricular FibrillationFetal DiseasesTachycardia, Sinoatrial Nodal ReentryMyocardiumBundle of HisEquipment DesignHeart VentriclesVentricular Dysfunction, LeftPericardiumVenae CavaeQuinidineTachycardia, Atrioventricular Nodal ReentryDigoxinRisk FactorsEdrophoniumHeart TransplantationEndocardiumModels, CardiovascularChi-Square DistributionVentricular Premature ComplexesSulfonamidesAtrial SeptumDefibrillators, ImplantableCardiac Complexes, PrematureIncidenceSurgery, Computer-AssistedAtrioventricular Block