Characteristics of aortic prostheses
| AVR | MECH (n=27) | BIO (n=14) | AoV (m/s) | PGR (mm Hg) | MGR (mm Hg) |
| Starr–Edwards | 19 | – | 2.9 (0.5) | 38 (13) | 22 (8) |
| Bjork–Shiley | 6 | – | 3.0 (1.0) | 41 (30) | 22 (15) |
| St Jude | 2 | – | 2.5 (0.3) | 25 (7) | 11 (4) |
| Carpentier–Edwards | – | 14 | 2.0 (0.3) | 17 (6) | 9 (4) |
AoV, peak aortic velocity; AVR, aortic valve replacement; BIO, bioprosthesis; MECH, mechanical; MGR, mean pressure gradient; PGR, peak pressure gradient two weeks postoperatively.