The American Heart Association 17-segment model standardizes the left ventricle into basal, mid, and apical sections — the lingua franca for reporting perfusion and wall-motion findings across modalities.
1 Basal & mid cavity segments
| Wall | Basal | Mid |
|---|---|---|
| Anterior | 1 | 7 |
| Anteroseptal | 2 | 8 |
| Inferoseptal | 3 | 9 |
| Inferior | 4 | 10 |
| Inferolateral | 5 | 11 |
| Anterolateral | 6 | 12 |
2 Apical segments
| Wall | Segment |
|---|---|
| Anterior | 13 |
| Septal | 14 |
| Inferior | 15 |
| Lateral | 16 |
3 True apex
Segment 17 — the apical cap, supplied almost exclusively by the LAD.