Atrial AppendageEmbolismEchocardiography, TransesophagealAtrial FibrillationAnticoagulantsAtrial Function, LeftHeart AtriaThromboembolismSeptal Occluder DeviceThrombosisElectric CountershockHeart AneurysmHeart DiseasesProstheses and ImplantsMitral Valve StenosisCatheter AblationAtrial FlutterBlood Flow VelocityPulmonary VeinsCardiac CatheterizationCardiac Surgical ProceduresRheumatic Heart DiseaseTherapeutic OcclusionAtrial FunctionEchocardiography