Atrial SeptumHeart SeptumLipomatosisHeart AtriaHeart Septal Defects, AtrialHeart NeoplasmsLipomaAnticestodal AgentsEchocardiography, TransesophagealAtrial FunctionForamen OvaleMyxomaAtrioventricular NodeHeart Conduction SystemCardiac Surgical ProceduresEchocardiographySeptum of BrainCatheter AblationCardiac Pacing, ArtificialAtrial FibrillationVentricular SeptumSeptum PellucidumPulmonary Wedge PressureNasal SeptumElectrocardiographyHeart DiseasesMonitoring, IntraoperativeForamen Ovale, PatentProstheses and ImplantsHeart AneurysmCardiac CatheterizationTreatment OutcomeTomography, X-Ray ComputedAtrial Function, RightAtrial AppendageElectrophysiologic Techniques, CardiacHeart Septal DefectsSeptal Occluder DeviceFluoroscopyBalloon OcclusionFontan ProcedureVena Cava, SuperiorAtrial FlutterTricuspid ValveEmbolism, ParadoxicalEmbolismPersistent Fetal Circulation SyndromeHeart Defects, CongenitalRefractory Period, ElectrophysiologicalVectorcardiographyEchocardiography, DopplerHeart BlockFetal HeartFistulaAtrial Function, LeftHypoplastic Left Heart SyndromeEchocardiography, Three-DimensionalPulmonary VeinsEchocardiography, Doppler, ColorHeart-Lung TransplantationCatheterizationHeart VentriclesHeartMitral ValveTachycardia, Atrioventricular Nodal Reentry