Suitability of secundum atrial septal defect for transcatheter device closure
| View | TOE measurements (mm) | |
| Any | Largest dimension of defect (2DE) | |
| Largest dimension of defect (CFM) | ||
| Mid oesophageal four chamber view | Inferior rim of defect to MV | |
| Inferior rim of defect to TV | ||
| Total septal length | ||
| Short axis view at base of heart | Antero-superior rim of defect (to aortic root) | |
| Posterior rim of defect (to pulmonary vein) | ||
| Total septal length | ||
| G-O junction (0°) or oblique (130°) coronary sinus view | Inferior rim of defect to coronary sinus | |
| Biatrial view | Superior rim of defect to SVC | |
| Inferior rim of defect to IVC | ||
| Total septal length | ||
2DE, two dimensional echocardiography; CFM, colour flow mapping; G-O, gastro-oesophageal; IVC, inferior vena cava; MV, mitral valve; SVC, superior vena cava; TV, tricuspid valve.