Near-infrared spectroscopy
| . | Trigger < 8 g/dL (n = 21) . | Trigger < 9.7 g/dL (n = 23) . | P . |
|---|---|---|---|
| Desaturation load*, minutes× % | |||
| Cerebrum, median (IQR) | 421 (42 to 888) | 127 (11 to 331) | .0036 |
| Biceps muscle, median (IQR) | 75 (6 to 234) | 112 (16 to 325) | .97 |
| Lowest value before red cell transfusion†, % | |||
| Regional cerebral oxygenation, mean‡ | 55.9 | 58.0 | .23 |
| Regional biceps muscle oxygenation, mean§ | 69.6 | 68.1 | .36 |
| . | Trigger < 8 g/dL (n = 21) . | Trigger < 9.7 g/dL (n = 23) . | P . |
|---|---|---|---|
| Desaturation load*, minutes× % | |||
| Cerebrum, median (IQR) | 421 (42 to 888) | 127 (11 to 331) | .0036 |
| Biceps muscle, median (IQR) | 75 (6 to 234) | 112 (16 to 325) | .97 |
| Lowest value before red cell transfusion†, % | |||
| Regional cerebral oxygenation, mean‡ | 55.9 | 58.0 | .23 |
| Regional biceps muscle oxygenation, mean§ | 69.6 | 68.1 | .36 |
All 46 patients (22 vs 24) randomly assigned before the end of surgery were monitored, but because of the loss of NIRS signals, data were missing from 1 patient in each group, yielding the sample of 21 in the low-trigger vs 23 in the high-trigger group.
The desaturation load was defined as the cumulative area (minutes × %) below baseline and was analyzed by van Elteren’s test adjusted for operation type.
General linear model adjusted for operation type, age, and baseline.
Mean difference, −2.11 (95% CI, −5.59 to 1.37).
Mean difference, 1.50 (95% CI, −1.76 to 4.76).