Evolution of rheumatic heart disease according to WHF criteria
| Regression | Stable disease | Progression | Missing | ||
| Definite rheumatic heart disease | |||||
| A | Pathological MR and at least two morphological features of RHD of the MV | 10 | 19 | 0 | 6 |
| B | MS mean gradient ≥4 mm Hg | 0 | 0 | 0 | 0 |
| C | Pathological AR and at least two morphological features of RHD of the AV | 0 | 1 | 0 | 0 |
| D | Borderline disease of both the AV and MV | 0 | 0 | 0 | 0 |
| Borderline rheumatic heart disease | |||||
| A | At least two morphological features of RHD of the MV without pathological MR or MS | 2 | 4 | 2 | 2 |
| B | Pathological MR | 2 | 3 | 1 | 1 |
| C | Pathological AR | 0 | 0 | 0 | 0 |
AR, aortic regurgitation; AV, aortic valve; MR, mitral regurgitation; MS, mitral stenosis; MV, mitral valve; RHD, rheumatic heart disease; WHF, World Heart Federation.