Atrial AppendageHeart AtriaEchocardiography, TransesophagealAtrial Function, LeftIsomerismAtrial FibrillationHeart Defects, CongenitalHeterotaxy SyndromeHeart Septal DefectsThromboembolismPulmonary VeinsElectric CountershockAbnormalities, MultipleSitus InversusThrombosisHeart AneurysmVenae CavaeSeptal Occluder DeviceAtrial FunctionDextrocardiaHeart DiseasesLevocardiaCatheter AblationAtrial SeptumAtrial FlutterHeart Bypass, RightMitral Valve StenosisEchocardiographyProstheses and ImplantsSinoatrial NodeCardiac Pacing, ArtificialAnticoagulantsHeart BlockCardiac Surgical ProceduresAtrial Function, RightErythrocruorinsRheumatic Heart DiseasePulmonary Veno-Occlusive DiseaseBlood Flow VelocityTachycardia, Ectopic AtrialDiabetes Insipidus, NeurogenicEmbolismSick Sinus SyndromePericardiumCardiac CatheterizationFeasibility StudiesGrowth Differentiation Factor 1Therapeutic OcclusionTreatment OutcomeEchocardiography, Doppler, PulsedWarfarinFetal HeartCyanosisAbortion, EugenicDogsHeart Septal Defects, AtrialCardiac CathetersEchocardiography, Three-DimensionalExtremitiesVena Cava, SuperiorRefractory Period, ElectrophysiologicalStrokePericardial EffusionAtrioventricular NodeHeart Valve DiseasesBody PatterningCarcinoma, Skin AppendageHeart Conduction SystemNodal ProteinMitral ValveCoronary ThrombosisEchocardiography, DopplerCefamandoleElectrocardiographyBalloon OcclusionFetal DiseasesFollow-Up StudiesHeart RatePacemaker, ArtificialHeart SeptumMyocardiumVena Cava, InferiorMyocardial StunningPremedicationEndocardiumTime FactorsBalloon ValvuloplastyFontan ProcedureAzygos VeinTachycardia, Supraventricular