Table 2 Comparison of intraoperative risk factors in participants with and without delirium

Clinical characteristics 

 Grafts used, ≥ 3 (%)

204 (47.2)

316 (64.8)

 < 0.001*

 Second time surgery, yes (%)

17 (3.9)

22 (4.5)

0.667

 Duration of surgery, ≥ 247 min (%)

147 (34)

326 (66.8)

 < 0.001*

 Cardiopulmonary bypass (CPB), yes (%)

415 (96.1)

486 (99.6)

0.956

 CPB duration, ≥ 80 min (%)

159 (36.8)

307 (62.9)

 < 0.001*

 Duration of aortic clamp, ≥ 48 min (%)

177 (41)

299 (61.3)

 < 0.001*

 Main arterial pressure (MAP) during CPB, ≥ 72 (mmHg)

200 (46.3)

261 (53.5)

0.030*

 PaO2 during CPB, ≥ 346 (mmHg)

215 (49.8)

256 (52.5)

0.415

 Hypothermia during CPB, ≤ 32 °C (%)

166 (38.4)

261 (53.5)

 < 0.001*

 Hemofiltration, ≤ 2 L/h (%)

155 (35.9)

256 (52.5)

 < 0.001*

 CPB weaning, with external helping (%)

43 (10)

352 (66.6)

 < 0.001*

Laboratory data

 Minimum hematocrit level on CPB, median (IQR)

25 (22–26)

22 (20–25)

 < 0.001*

 Maximum lactate on CPB (mmol/L), median (IQR)

1.4 (1.2–1.8)

1.8 (1.4–2.4)

 < 0.001*

 Minimum blood glucose during CPB (mg/dL), median (IQR)

124 (88–146)

136 (98–165)

 < 0.001*

 Maximum blood glucose during CPB (mg/dL), median (IQR)

166 (143–198)

198 (166.25–248.75)

 < 0.001*

Blood transfusion data

 Blood product, packed red blood cells (PRBC)

142 (32.9)

277 (56.8)

 < 0.001*

 Blood product, platelets

290 (67.1)

211 (43.2)