| ASD II | Secundum atrial septal defect |
| ASO | Amplatzer septal occluder |
| LAA | Late atrial arrhythmia |
| IAS | Interatrial septal length |
| IAS/ASO ratio | Interatrial septal length to the left atrial external device diameter of the ASO |
| Qp/Qs ratio | Ratio of pulmonary to systemic blood flow, estimated from oximetry without oxygen supplementation |
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