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