Table 4.
The result of perioperative blood changes in patient
| Variable | ULIF | O-TLIF | P-value |
|---|---|---|---|
| Preoperative haematocrit (%) | 39.49 ± 4.43 | 40.85 ± 4.25 | 0.000* |
| Postoperative haematocrit (%) | 36.37 ± 4.24 | 36.64 ± 4.42 | |
| Preoperative hemoglobin (g/L) | 133.02 ± 18.14 | 138.04 ± 15.56 | 0.000* |
| Postoperative hemoglobin (g/L) | 119.07 ± 15.70 | 120.23 ± 15.40 | |
| Preoperative red blood cells (10^12/L) | 4.48 ± 0.45 | 4.49 ± 0.48 | 0.000* |
| Postoperative red blood cells (10^12/L) | 4.05 ± 0.38 | 3.96 ± 0.51 | |
| Patient’s blood volume (ml) | 4008.11 ± 626.59 | 4092.18 ± 833.09 | 0.558 |
| Total blood loss (ml) | 326.86 ± 223.45 | 427.97 ± 280.52 | 0.043* |
| Measured blood loss (ml) | 99.00 ± 72.81 | 270.66 ± 102.34 | 0.000* |
| Hidden blood loss (ml) | 227.86 ± 221.75 | 157.31 ± 268.08 | 0.143 |
| TBL as a % of PBV | 8.15 ± 5.37 | 10.45 ± 5.87 | 0.000* |
| HBL as a % of TBL | 69.71 ± 23.72 | 36.76 ± 18.79 | 0.000* |
Open transforaminal lumbar interbody fusion O-TLIF, Unilateral biportal endoscopic transforaminal lumbar interbody fusion ULIF, Total blood loss TBL, Hidden blood loss HBL, Patient’s blood volume PBV. Data are mean ± standard deviation, *P < 0.05