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Table 1 Baseline characteristics and intraoperative characteristics of patients according to the category of red blood cell transfusion

From: Blood transfusion in cardiac surgery is a risk factor for increased hospital length of stay in adult patients

Variable Unit of RBC  
None (N = 199) 1–3 units (N = 241) >3 units (N = 62) P
Gender (Female) 49 (24.6%) 114 (47.3%) 29 (46.8%) <0.001
Age (≥65 years) 57 (28.6%) 107 (44.4%) 30 (48.4%) 0.001
Redo surgery 3 (1.5%) 7 (2.9%) 14 (22.6%) <0.001
EuroSCORE     
<3 126 (63.3%) 146 (60.6%) 35 (56.5%) <0.001
3–5 63 (31.7%) 78 (32.4%) 18 (29%)  
>5 10 (5%) 17 (7.1%) 9 (14.5%)  
Left ventricular ejection fraction (%)    
<40 29 (14.6%) 31 (12.9%) 9 (14.5%) 0.738
40–59 53 (26.6%) 78 (32.4%) 20 (32.3%)  
≥60 117 (58.8%) 132 (54.8%) 33 (53.2%)  
Previous myocardial infarction 72 (36.2%) 80 (33.5%) 23 (37.7%) 0.755
Hypertension 159 (79.9%) 183 (75.9%) 51 (82.3%) 0.435
Diabetes 62 (31.2%) 75 (31.4%) 28 (45.9%) 0.075
Renal disease 15 (7.5%) 25 (10.7%) 12 (20.3%) 0.019
Unstable Angina 60 (30.2%) 74 (30.7%) 21 (33.9%) 0.855
Liberal RBC transfusion strategy 58 (29.1%) 147 (61%) 48 (77.4%) <0.001
Procedure     
CABG 126 (63.3%) 146 (60.6%) 35 (56.5%) 0.164
Valve 63 (31.7%) 78 (32.4%) 18 (29%)  
CABG + valve 10 (5%) 17 (7.1%) 9 (14.5%)  
Cardiopulmonary bypass (>100 min) 59 (29.8%) 86 (35.8%) 27 (43.5%) 0.112
Initial hemoglobin (<13 g/dL) 64 (32.7%) 173 (72.7%) 51 (82.3%) <0.001
Initial hematocrit (<39%) 45 (23%) 151 (63.4%) 47 (75.8%) <0.001
Initial lactate (≥2 mmol/L) 55 (27.8%) 56 (23.5%) 10 (16.1%) 0.163
Initial SvcO2 (≥65%) 143 (87.2%) 163 (80.7%) 46 (83.6%) 0.248
  1. Abbreviations: RBC, red blood cell transfusion;EuroSCORE, European System for Cardiac Operative Risk Evaluation; Redo, previous cardiac surgery, CABG, coronary artery bypass surgery; SvcO 2 , central venous oxygen saturation; min: minutes; Initial = samples collected after the induction of anesthesia.