| ASD | Atrial septal defect |
| ASO | Atrial septal occlude |
| CABARET | CAse-BAsed REview sTandards |
| CT | Computed tomography |
| ESC | European Society of Cardiology |
| LA | Left atrium |
| OS | Ostium secundum |
| RA | Right atrium |
| TEE | Transesophageal echocardiography |
| TTE | Transthoracic echocardiography |
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