Table 1 Comparison of patients' cohorts
From: Prolonged ventilation post cardiac surgery - tips and pitfalls of the prediction game
Group of variables | Variable | 2007-2008 (n = 2165) | 2009-2010 (n = 2192) | p | ||
|---|---|---|---|---|---|---|
Demographic data and general condition | Age > 65 years | 897 | (41%) | 977 | (45%) | 0.04 |
| Â | Female gender | 711 | (33%) | 696 | (32%) | 0.44 |
| Â | Unstable course of disease | 801 | (37%) | 891 | (41%) | 0.01 |
| Â | Critical preoperative state | 9 | (0.4%) | 8 | (0.4%) | 0.78 |
Circulatory function | CCS class IV | 193 | (8.9%) | 197 | (9%) | 0.93 |
| Â | NYHA class III or IV | 344 | (16%) | 464 | (21%) | <0.01 |
| Â | Previous PTCA/stent | 527 | (24%) | 562 | (26%) | 0.32 |
| Â | Recent MI up to 90 days | 395 | (18%) | 328 | (15%) | <0.01 |
| Â | EF < 40% | 233 | (11%) | 267 | (12%) | 0.14 |
| Â | Endocarditis | 22 | (1.0%) | 20 | (0.9%) | 0.72 |
Co-morbidities | Diabetes | 638 | (30%) | 582 | (27%) | 0.03 |
| Â | Arterial hypertension | 1555 | (72%) | 1713 | (78%) | <0.01 |
| Â | BMI > 35 | 106 | (5%) | 99 | (5%) | 0.78 |
| Â | Renal failure | 46 | (2%) | 56 | (3%) | 0.35 |
| Â | COPD | 214 | (10%) | 193 | (9%) | 0.22 |
| Â | History of TIA or stroke | 133 | (6%) | 125 | (6%) | 0.54 |
| Â | Carotid disease | 248 | (12%) | 289 | (13%) | 0.08 |
| Â | Peripheral vascular disease | 312 | (14%) | 308 | (14%) | 0.73 |
Procedure -related variables | Previous cardiac surgery | 82 | (4%) | 78 | (4%) | 0.69 |
| Â | Non-elective surgery | 338 | (16%) | 625 | (29%) | <0.01 |
| Â | Emergency surgery | 62 | (3%) | 75 | (3%) | 0.29 |
| Â | CABG | 783 | (36%) | 412 | (19%) | <0.01 |
| Â | OPCAB/MIDCAB | 576 | (27%) | 876 | (40%) | <0.01 |
| Â | CPB > 2 h | 532 | (25%) | 444 | (20%) | <0.01 |
| Â | Coronary surgery | 1359 | (63%) | 1288 | (59%) | 0.01 |
| Â | Valve surgery | 500 | (23%) | 577 | (26%) | 0.01 |
| Â | Combined procedures | 206 | (9.5%) | 218 | (10%) | 0.63 |
| Â | Aortic aneurysm surgery | 100 | (4.6%) | 109 | (5.0%) | 0.58 |