Table 1 Patient characteristics and preoperative comorbidities according to case volume
Low volume (< 30 cases/year, n = 1928) | Medium volume (30–60 cases/year, n = 717) | High volume (> 60 cases/year, n = 2222) | P | |
|---|---|---|---|---|
Age (years) | 61.9 (14.4) | 60.6 (14.7) | 63.2 (13.3) | < 0.001 |
Female | 969 (50.3%) | 340 (47.4%) | 844 (38.0%) | < 0.001 |
Extracardiac arteriopathy | 250 (13.0%) | 77 (10.7%) | 298 (13.4%) | 0.174 |
Renal impairment | 31 (1.6%) | 7 (1.0%) | 29 (1.3%) | 0.430 |
Chronic lung disease | 623 (32.3%) | 239 (33.3%) | 745 (33.5%) | 0.695 |
Hypertension | 1151 (59.7%) | 397 (55.4%) | 1446 (65.1%) | < 0.001 |
Hyperlipidemia | 382 (19.8%) | 154 (21.5%) | 618 (27.8%) | < 0.001 |
Diabetes mellitus | 150 (7.8%) | 42 (5.9%) | 193 (8.7%) | 0.049 |
Atrial fibrillation | 66 (3.4%) | 26 (3.6%) | 133 (6.0%) | < 0.001 |
Angina pectoris | 351 (18.2%) | 154 (21.5%) | 521 (23.5%) | < 0.001 |
Recent MI | 42 (2.2%) | 7 (1.0%) | 37 (1.7%) | 0.101 |
History of PCI | 15 (0.8%) | 8 (1.1%) | 26 (1.2%) | 0.429 |
Congestive heart failure | 157 (8.1%) | 69 (9.6%) | 180 (8.1%) | 0.405 |
Emergent surgery | 104 (5.4%) | 27 (3.8%) | 70 (3.2%) | 0.001 |
Perioperative RBC Transfusion (units) | 4 (3–5) | 3 (2–4) | 3 (2–5) | < 0.001 |
Surgery site | < 0.001 | |||
Ascending aorta | 805 (41.8%) | 312 (43.5%) | 330 (14.9%) | |
Aortic arch | 185 (9.6%) | 30 (4.2%) | 81 (3.7%) | |
Descending thoracic aorta | 283 (14.7%) | 144 (20.1%) | 672 (30.2%) | |
Combined | 655 (34.0%) | 231 (32.2%) | 1139 (51.3%) |