Tachycardia, SupraventricularTachycardia, ParoxysmalTachycardiaTachycardia, Atrioventricular Nodal ReentryProton-Translocating ATPasesTachycardia, VentricularElectrocardiographyWolff-Parkinson-White SyndromeCatheter AblationHydrops FetalisPortal VeinAnti-Arrhythmia AgentsAtrioventricular NodeTachycardia, SinusTachycardia, Ectopic AtrialFlecainideTachycardia, Ectopic JunctionalDigoxinHeartHypertension, PortalHeart Conduction SystemBundle of HisHeart RateArrhythmias, CardiacCardiac Pacing, ArtificialHypertensionElectrophysiologic Techniques, CardiacAtrial FlutterHeart FailureAccessory Atrioventricular BundleFetal DiseasesAtrial Premature ComplexesPre-Excitation SyndromesElectrocardiography, AmbulatoryAmiodaroneHypertension, PulmonaryTachycardia, Sinoatrial Nodal ReentryAtrial FibrillationPortal SystemTreatment OutcomeHeart AtriaElectrocoagulationCattleFollow-Up StudiesHeart BlockHeart Rate, FetalAtrioventricular BlockSotalolHeart Defects, CongenitalElectric CountershockHydroxyzineEchocardiographyHemodynamicsVerapamilRetrospective StudiesFinancial AuditTime FactorsDefibrillators, ImplantableBlood PressureBody Surface Potential MappingCardiomyopathy, DilatedSyncopePropafenoneHeart VentriclesFetal HeartLavandulaInfant, NewbornFetal DistressRecurrencePacemaker, ArtificialVentricular FibrillationProspective StudiesPortal PressureAdenosineSinoatrial NodeCardiac Complexes, PrematurePostural Orthostatic Tachycardia SyndromeCardiac CatheterizationElectrophysiologyRisk FactorsHypertension, RenalHeart DiseasesAntihypertensive AgentsUltrasonography, PrenatalVentricular Function, LeftTachycardia, ReciprocatingPregnancyAzygos VeinAdrenergic beta-AntagonistsInjections, IntravenousIncidenceSafetyPostoperative ComplicationsDogsVentricular Premature ComplexesFluoroscopyHypertension, RenovascularMonitoring, PhysiologicPrognosisMyocardium