Heart valve defects (HKF) can be classified into the following severity levels according to the New York Heart Association (NYHA):
NYHA | Complaint level |
I | No complaints |
II | Complaints during heavy exertion |
III | Complaints during light exertion |
IV | Complaints at rest |
Aortic valve stenosis can be classified as follows:
Grade | KÖF* (cm²) | KÖF/body surface (cm²/m²) | Mean pressure difference (mmHg) | Maximum transvalvular flow velocity (m/s) |
Light | > 1,5 | > 1,0 | < 25 | < 3,0 |
Medium | 1,0- 1,5 | 0,6-1,0 | 25-50 | 3,0-4,0 |
Heavy | < 1,0 | < 0,6 | > 50 | > 4,0 |
* KÖF = valve orifice areaAortic valve regurgitation can be classified as follows:
Grade | Regurgitation fraction |
I | < 20 % |
II | 20-39 % |
III | 40-60 % |
IV | > 60 % |
Mitral stenosis can be classified as follows:
Grade | Mitral orifice area (cm²) | Mean pressure gradient (mmHg) | Mean pulmonary capillary pressure under stress (mmHg) |
Slightly | < 8 | > 1,5-2,5 | < 21 |
Medium | 8-15 | 1,0-1,5 | 21-25 |
Heavy | > 15 | < 1,0 | > 25 |
Mitral regurgitation can be classified as follows:
Grade | Regurgitation fraction |
I | < 20 % |
II | 20-39 % |
III | 40-60 % |
IV | > 60 % |