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