Pathological score | Pathological grading | Left ventricular lesions |
0 | − | The structure of the heart was normal and no obvious pathological changes were found. |
1 | + | Epicardium was thickened, focal myocardial cells under epicardium were swelling, degenerative and necrotic, accompanied by granulation tissue or fibrous tissue hyperplasia and the infiltration of a small amout inflammatory cells. |
2 | ++ | Epicardium was thickened, small patchy myocardial cells under epicardium were necrotic, granulation tissue or fibrous tissue was mildly hyperplastic, and a small amount of inflammatory cells were infiltrated. |
3 | +++ | Epicardium was thickened, patchy myocardial cells under epicardium were necrotic, accompanied by the hyperplasia of granulation tissue or fibrous tissue and the infilatration of a small amount inflammatory cell. |
4 | ++++ | Large area myocardium was infarcted (transmural infarct), granulation tissue or fibrous scar tissue was significantly increased, the ventricular wall was significantly thin. |