Previous surgery
| Total 80 | Re-do complex surgery 39 | Re-do AVR 41 | P value | |
| Type of surgery | ||||
| Isolated AV surgery | 38 (47.5) | 11 (28.2) | 27 (65.9) | 0.001 |
| Repair | 12 (15) | 3 (7.7) | 9 (22) | NS |
| Replacement | 26 (32.5) | 8 (2.5) | 18 (43.9) | 0.022 |
| Complex aortic surgery | 32 (40) | 26 (66.7) | 6 (14.6) | 0.000 |
| Root | 26 (32.5) | 21 (53.8) | 5 (12.2) | 0.000 |
| Ascending | 7 (8.8) | 6 (15.4) | 1 (2.4) | 0.047 |
| Arch | 1 (1.2) | 1 (2.6) | 0 | NS |
| Concomitant procedures | 9 | 4 | 5 | NS |
| CABG | 6 | 3 | 3 | NS |
| Mitral valve | 3 | 1 | 2 | NS |
| Non-aortic surgery | 10 (12.5) | 2 (5.1) | 8 (19.5) | 0.052 |
| CABG | 8 (10) | 1 (2.6) | 7 (17.1) | 0.034 |
| Mitral | 2 (2.5) | 1 (2.6) | 1 (2.4) | NS |
| Type of prosthesis | ||||
| Bioprosthesis | 15 (18.8) | 2 (5.1) | 13 (31.7) | 0.002 |
| Mechanical valve | 15 (18.8) | 9 (23.1) | 6 (14.6) | NS |
| Homograft | 11 (13.4) | 11 (28.2) | 0 | 0.000 |
| BioRoot | 7 (8.8) | 7 (17.9) | 0 | 0.005 |
AV, Aortic Valve; AVR, aortic valve replacement; CABG, coronary artery bypass graft; NS, not stated.