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Table 1 Prevalence of preoperative risk factors

From: Risk factors for mediastinitis after cardiac surgery – a retrospective analysis of 1700 patients

Variable Mediastinitis (n) Σ (n) p
  No Yes   
Age (years) 64.1 ± 10.2 66.5 ± 8.73 1700 0.71
Gender     
Male 1175 37 1212 n.s.
Female 479 8 487  
Body mass index (kg/m2) 28.0 29.8 1700 0.008
Hypertension     
No 273 7 280 n.s.
Yes 1381 38 1419  
Diabetes mellitus     
No 1086 23 1109 0.05
Yes 568 22 590  
Active Smoking     
No 858 15 873 n.s.
Yes 295 11 306  
COPD     
No 1507 35 1542 0.006
Yes 147 10 157  
Peripheral vascular disease     
No 1465 39 1504 n.s.
Yes, untreated 132 3 135  
Yes, treated 56 3 59  
Ejection fraction (% ± SD) 59.6 ± 15.8 58.7 ± 15.0 1700 n.s.
Previous cardiac surgery     
No 1607 45 1652 n.s.
Yes 47 0 47  
NYHA class     
I 113 3 116 n.s.
II 882 19 901  
III 566 20 586  
IV 55 2 57  
CCS class     
I 100 0 100 0.02
II 725 15 740  
III 686 23 709  
IV 104 7 111  
Renal insufficiency     
No 1318 30 1348 n.s.
Yes, compensated 309 14 323  
Yes, dialysis 16 1 17  
Status post renal transplantation 4 0 4  
Hemoglobin (mmol/l ± SD) 8.6 ± 1.1 8.4 ± 1.2 1697 n.s.
Creatinine (μmol/l ± SD) 96.7 ± 64.9 109.1 ± 58.7 1690 n.s.
Blood urea nitrogen (mmol/l ± SD) 6.8 ± 3.2 7.5 ± 4.4 1672 n.s.
Surgical technique     
cardiopulmonary bypass 1276 32 1308 n.s.
OPCAB 276 9 285  
PACAB 18 0 18  
MIDCAB 84 4 88  
Number of bypasses (n ± SD) 2.6 ± 1.2 2.7 ± 1.1 1699 n.s.
Use of LIMA     
No 479 9 488 n.s.
Yes 1175 36 1211  
Bilateral IMA use     
No 1587 40   0.02
Yes 67 5   
Total arterial revascularization     
No 1276 31 1307 n.s.
Yes 378 14 392  
  1. Prevalence of preoperative risk factor among the study population. Data are shown either as absolute numbers or as mean ± SD. Besides several demographic data, there are also variables describing clinical conditions and surgical technique.