Atrial AppendageEmbolismEchocardiography, TransesophagealAtrial FibrillationAnticoagulantsHemostatic TechniquesWound Closure TechniquesHeart AtriaAtrial Function, LeftHemostasis, SurgicalSeptal Occluder DevicePuncturesFemoral ArteryCardiac CatheterizationProstheses and ImplantsSuturesEquipment DesignThromboembolismSuture TechniquesEquipment SafetyForamen Ovale, PatentHeart Septal Defects, AtrialEquipment and SuppliesElectric CountershockDevice RemovalCatheterization, PeripheralThrombosisEquipment FailureHematomaBalloon OcclusionHeart AneurysmTreatment OutcomeCardiac Surgical ProceduresHemorrhageSurgical InstrumentsAtrial FunctionHeart DiseasesFeasibility Studies