Patient demographics and preoperative data
| On-X group, n=33 | St Jude Medical Regent valve group, n=33 | p Value | |
| Female, n (%) | 6 (18.2) | 9 (27.3) | 0.279 |
| Age, years (SD) | 50.4 (14.3) | 55.3 (7.5) | 0.216 |
| Body surface area, m2 (SD) | 2.0 (0.3) | 2.0 (0.3) | 0.200 |
| Diabetes, n (%) | 4 (12.1) | 15 (45.5) | 0.003 |
| Hypertension, n (%) | 13 (39.4) | 22 (66.7) | 0.028 |
| Hyperlipidaemia, n (%) | 10 (30.3) | 18 (54.5) | 0.048 |
| Renal failure requiring dialysis, n (%) | 0 (0) | 1 (3.0) | 0.317 |
| Peripheral vascular disease, n (%) | |||
| Chronic obstructive pulmonary disease, n (%) | 4 (12.1) | 7 (21.2) | 0.325 |
| Cerebrovascular accident, n (%) | 1 (3.0) | 0 (0) | 0.317 |
| Coronary artery disease, n (%) | 7 (21.2) | 12 (36.4) | 0.174 |
| NYHA class, n (%) | 0.128 | ||
| NYHA 1 | 1 (3.0) | 0 (0) | |
| NYHA 2 | 16 (48.5) | 11 (33.3) | |
| NYHA 3 | 14 (42.4) | 19 (57.6) | |
| NYHA 4 | 2 (6.1) | 3 (9.1) | |
| Peak gradient, mm Hg (SD)* | 82.8 (26.1) | 78.2 (18.9) | 0.637 |
| Mean gradient, mm Hg (SD)* | 56.9 (16.5) | 47.5 (10.9) | 0.159 |
| Aortic valve area, m2 (SD)* | 0.80 (0.26) | 0.85 (0.15) | 0.975 |
| Reduced left ventricular ejection fraction (<50%), n (%) | 3 (9.1) | 5 (15.1) | 0.319 |
| Valve lesion, n (%) | 0.317 | ||
| Aortic stenosis | 13 (39.4) | 17 (56.7) | |
| Aortic regurgitation | 15 (45.5) | 11 (36.7) | |
| Mixed disease | 5 (15.2) | 2 (6.7) |
*Patients with isolated aortic regurgitation are excluded from this calculation.
Significant p values are highlighted.
NYHA, New York Heart Association.