Postoperative complications, n (%)
| Mild AS (AVA >1.5 cm2) | Moderate AS (AVA 1.0–1.5 cm2) | Severe AS (AVA <1.0 cm2) | Control group | P value | |
| RBC transfusion | 45 (68.2) | 33 (70.2) | 22 (68.8) | 170 (60) | NS |
| Myocardial infarction | 3 (4.5) | 4 (8.5) | 5 (15.6) | 3 (1.1) | 0.0001 |
| Sepsis | 1 (1.5) | 0 | 0 | 5 (1.8) | NS |
| DVT | 4 (6) | 4 (8.5) | 2 (6.3) | 15 (5.3) | NS |
| Stroke | 0 | 0 | 0 | 1 (0.4) | NS |
| Delirium | 16 (24.2) | 18 (38.3) | 9 (28.1) | 56 (19.8) | 0.0160 |
| Respiratory failure | 2 (3) | 0 | 1 (3.1) | 7 (2.5) | NS |
| Heart failure | 1 (1.5) | 3 (6.4) | 5 (15.6) | 2 (0.7) | 0.0001 |
| AF | 2 (3) | 1 (2.1) | 1 (3.1) | 3 (1.1) | NS |
AF, atrial fibrillation; AS, aortic stenosis; AVA, aortic valve area; DVT, deep venous thrombosis; RBC, red blood cell.