Atrial FlutterAtrial FibrillationBradycardiaCatheter AblationHeart AtriaElectric CountershockAnti-Arrhythmia AgentsElectrocardiographyChronic DiseasePulmonary VeinsCardiac Pacing, ArtificialPropafenoneAtrial AppendageElectrophysiologic Techniques, CardiacAmiodaroneHeart Conduction SystemWarfarinAtrial FunctionAnticoagulantsAtrial Function, LeftRefractory Period, ElectrophysiologicalVentricular FibrillationAtrioventricular NodeTachycardia, ParoxysmalTreatment OutcomeSick Sinus SyndromePacemaker, ArtificialTricuspid ValveCryosurgeryArrhythmia, SinusSotalolElectrocardiography, AmbulatoryHeart BlockRecurrenceDigoxinBody Surface Potential MappingHeart RateFollow-Up StudiesProcainamideThromboembolismPericarditisHeart Valve DiseasesFlecainideAtrial Premature ComplexesEchocardiography, TransesophagealAtrial Function, RightTachycardia, SupraventricularTachycardiaTime FactorsBundle of HisMitral ValveProspective StudiesDisopyramideStrokeArrhythmias, CardiacTachycardia, Ectopic AtrialElectrophysiologyDogsEchocardiographyRisk FactorsCardiac Surgical ProceduresHeart DiseasesRetrospective StudiesVena Cava, InferiorAction PotentialsSinoatrial NodeWolff-Parkinson-White SyndromeHeart FailureEmbolismCoronary SinusAtrial Septumbeta-AlaninePostoperative ComplicationsFluoroscopyPredictive Value of TestsMitral Valve StenosisCardiac CathetersEchocardiography, DopplerHeart VentriclesInternational Normalized RatioVagus NerveIncidenceThrombosisAtrioventricular BlockBepridilHydrops FetalisRisk AssessmentHeart Valve Prosthesis ImplantationDefibrillators, ImplantableHemorrhageCardiac CatheterizationTachycardia, VentricularSurgery, Computer-AssistedTachycardia, Sinoatrial Nodal ReentryEquipment DesignMitral Valve InsufficiencyMyocardiumEndocardiumHeartTachycardia, Atrioventricular Nodal Reentry