Table 6.
Comparison of patients with increased (n=6)and normal oxygen extraction ratio (n=97) by oxygen extraction ratio greater than 50%.
| Increased O2ER | Normal O2ER | P | |
|---|---|---|---|
|
| |||
| Pretransfusion | |||
| Heart rate (bpm) | 137.4 (1.9) | 147.3 (7.9) | .13 |
| Mean blood pressure (mm Hg) | 59.16 (3.6) | 66 (0.9) | .09 |
| Urine output (mL/kg) | 3.5 (0.36) | 4.48 (0.19) | .2 |
| Hemoglobin (g/dL) | 8.9 (0.49) | 9.6 (0.29) | .55 |
| Lactic acid (mmol/l) | 2.13 (0.6) | 1.8 (0.17) | .63 |
| ScvO2 (%) | 44.7 (2.2) | 64.22 (1.3) | .0004 |
| O2ER (%) | 53 (0.6) (98) | 29.31 (1.19) (97) | .0026 |
| Posttransfusion O2ER (%) | 43.0 (2.9) | 27.7 (1.0) | .0001 |
Central venous oxygen saturation (ScvO2); Oxygen extraction ratio (O2ER). P values from unpaired t test.