Table 2.
Intraoperative and postoperative data
| Overall patients (n = 249) | Routine (n = 170) | Low flow (n = 79) | P value | |
|---|---|---|---|---|
| Fresh gas flow rate (L/min) (Median, IQR) | 2.0 (1.0, 2.0) | 2.0 (2.0, 2.0) | 1.0 (1.0, 1.0) | < 0.01* |
| Mean temperature during surgery (Mean ± SD) | 35.7 ± 0.8 | 35.6 ± 0.8 | 36.0 ± 0.6 | < 0.01* |
| Hospital mortality, n (%) | 25 (10.0) | 20 (11.8) | 6 (7.6) | 0.43 |
| Hypothermia, n (%) | 204 (81.9) | 149 (87.6) | 55 (69.6) | < 0.01* |
| Length of hypothermia (mins) (Median, IQR) | 90 (20, 148) | 104 (50, 156) | 30 (0, 100) | < 0.01* |
| The lowest temperature (°C) (Median, IQR) | 35.4 (34.7, 35.8) | 35.1 (34.5, 35.7) | 35.7 (35.3, 36.0) | < 0.01* |
| Duration of surgery (mins) (Mean ± SD) | 92.0 ± 45.0 | 91.8 ± 45.9 | 92.6 ± 43.4 | 0.81 |
| Transfusion (ml) | ||||
| Blood (Mean ± SD) | 7.1 ± 12.7 | 7.7 ± 13.8 | 5.7 ± 10.4 | 0.52 |
| Plasma (Mean ± SD) | 0.9 ± 1.8 | 1.4 ± 2.7 | 0 ± 0 | 0.17 |
| Blood loss during surgery (ml) (Mean ± SD) | 4.4 ± 4.0 | 4.3 ± 4.0 | 4.4 ± 4.1 | 0.94 |
| Fluid infusion during surgery (mL) (Mean ± SD) | 98.9 ± 50.8 | 99.9 ± 53.4 | 97.1 ± 44.8 | 0.72 |
| Urine (ml) (Mean ± SD) | 13.6 ± 11.0 | 13.2 ± 10.4 | 14.3 ± 12.2 | 0.85 |
| Preoperative Hemoglobin (g/dL) (Mean ± SD) | 146.3 ± 47.2 | 141.4 ± 41.3 | 156.9 ± 60.0 | 0.39 |
| Postoperative Hemoglobin (g/dL) (Mean ± SD) | 125.4 ± 34.2 | 124.8 ± 35.5 | 126.7 ± 31.2 | 0.30 |
| Postoperative hospital length-of- stay (PLOS), days (Mean ± SD) | 22.9 ± 18.6 | 23.9 ± 19.6 | 20.8 ± 16.6 | 0.13 |
Note: Sample (n), Standard deviation (SD), Interquartile Range (IQR), *P<0.05