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The diagnostic criteria of the International Society for Heart and Lung Transplantation (ISHLT).
| Grade | Histopathological changes |
|---|---|
| 0 | Rejectin free |
| 1 | Focal and/or perivascular inflammatory cell infiltration, ≤1 myocardial lesion |
| 2 | Multifocal inflammatory cell infiltration with myocardial damage |
| 3 | Diffuse inflammatory cell infiltration, multiple myocardial lesions |
