Endomyocardial biopsy findings in 16/20 patients with hypertrophic cardiomyopathy (haematoxylin-eosin staining)
| Biopsy findings | Number (%) |
| Heterogeneity in myocyte size | |
| No | 3 (19) |
| Moderate | 6 (38) |
| Marked | 7 (44) |
| Myocyte hypertrophy | |
| No | 1 (6) |
| Mild | 11 (69) |
| Moderate | 4 (25) |
| Myofibre disarray | |
| No | 2 (13) |
| Mild | 6 (38) |
| Moderate | 6 (38) |
| Marked | 2 (13) |
| Myocardial fibrosis | |
| No | 2 (13) |
| Mild | 6 (38) |
| Moderate | 6 (38) |
| Marked | 2 (13) |
| Inflammatory cell infiltration* | |
| No | 10 (63) |
| Mild | 4 (25) |
| Moderate | 1 (6) |
| Marked | 1 (6) |
| Intramyocardial small artery narrowing | |
| No | 12 (75) |
| Mild | 2 (13) |
| Moderate | 1 (6) |
| Marked | 1 (6) |
↵* Eosinophilic granulocytes and mononuclear inflammatory cells.