Table 2 Surgical characteristics
Sample n = 190 | Delirious n = 78 | Non-delirous n = 112 | OR (95% CI) | |
|---|---|---|---|---|
EuroSCORE II, median (IQR) | 3.9 (5.3) | 6.1 (5.8) | 3.3 (4.3) | 1.13 (1.06–1.21) |
Type of surgery n (%) | ||||
Valve | 185 (97.4) | 75 (96.2) | 110 (98.2) | 0.45 (0.07–2.79) |
CABG | 75 (39.5) | 37 (47.4) | 38 (33.9) | 1.75 (0.97–3.18) |
Combined surgery, n (%) | 72 (37.9) | 35 (44.8) | 37 (33.0) | 1.65 (0.91–2.99) |
Time on cardiopulmonary bypass (min), mean (SD) | 120.0 (43.0) | 130.4 (48.0) | 112.6 (37.9) | 1.01 (1.00–1.02) |
Duration of anaesthesia (min), mean (SD) | 283.0 (75.5) | 303.3 (83.7) | 268.7 (65.8) | 1.01 (1.00–1.01) |
Total morphine dose (μg) intraoperative, mean (SD) | 4385.1 (1546.0) | 4626.2 (1677.6) | 4220.0 (1433.6) | 1.01 (1.00–1.01) |
Total sedation dose (mg) intraoperative, mean (SD) | 878.2 (335.7) | 901.9 (371.1) | 861.8 (309.4) | 1.00 (0.99–1.01) |
Red blood cell transfusion (ml) intraoperative, median (IQR) | 254 (525) | 272.5 (565) | 248 (520.5) | 1.00 (0.99–1.01) |
Mean cardiac output (l/min) intraoperative, mean (SD) | 4.2 (1.5) | 4.4 (2.0) | 4.2 (0.9) | 1.10 (0.88–1.36) |
Use of inotropic medication (Yes) intraoperative, n (%) | 108 (56.8) | 47 (60.3) | 61 (54.5) | 1.27 (0.71–2.28) |
Highest intraoperative temperature (°C), mean (SD) | 36.6 (0.4) | 36.5 (0.4) | 36.6 (0.4) | 0.76 (0.37–1.54) |
Mean arterial pressure (mm Hg) intraoperative, mean (SD) | 75.0 (9.2) | 74.9 (9.2) | 75.0 (9.3) | 0.99 (0.97–1.03) |
Lowest haemoglobin value (g/dL) intraoperative, mean (SD) | 9.5 (1.0) | 9.4 (1.1) | 9.6 (0.9) | 0.82 (0.61–1.10) |
Highest urea value (mg/dL) interoperative, median (IQR) | 36 (17) | 38 (19) | 35 (15) | 1.01 (0.99–1.02) |
Length of stay in the intensive care unit (hours), median (IQR) | 48.1 (68.7) | 49.9 (68.6) | 47.4 (69) | 1.0 (0.99–1.01) |
Postoperative infection (Yes), n (%) | 43 (22.6) | 25 (32.1) | 18 (16.1) | 2.46 (1.23–4.93) |