Table 3.
Intraoperative characteristics
| All patients (n = 170) | TTA patients (n = 70) | TFA patients (n = 100) | P-value | |
| Bilateral amputation procedure | 9 (5) | 4 (6) | 5 (5) | |
| Rank of surgeon, resident/consultant % | 116/54 | 45/25 | 71/29 | 0.40 |
| (68/32) | (64/36) | (71/29) | ||
| Duration of surgery, minutes (SD) | 81 (23) | 85 (26) | 79 (20) | 0.06 |
| Neuraxial/general anesthesia | 121/49 | 56/14 | 65/35 | 0.04 |
| % | (71/29) | (80/20) | (65/35) | |
| Vasopressor agents during surgery (yes) | 106 | 37 (52) | 69 (69) | 0.037 |
| Tourniquet use (yes) | 49 (29) | 35 (50) | 11 (11) | < 0.001 |
| Initial heart rate (beats/min) (SD) | 85 (16) | 84 (15) | 85 (17) | 0.77 |
| Initial blood pressure (mmHg) | Sys: 131 (21) | Sys: 131 (20) | Sys: 131 (21) | 0.83 |
| Dia: 73 (13) | Dia: 74 (13) | Dia: 73 (12) | 0.552 | |
| Lowest heart rate (beats/min) | 72 (SD: 1.2) | 70 (SD: 1.9) | 74 (SD: 1.5) | 0.13 |
| Lowest mean arterial pressure (mmHg) | 64 (SD: 0.9) | 65 (SD: 1.4) | 64 (SD: 1.1) | 0.32 |
| Estimated blood loss (mL), median (IQR) | 300 (IQR: 125-475) | 248 (IQR: 88-408) | 400 (IQR: 231-569) | 0.15 |
| Perioperative blood lactate (SD) | 1.2 (1.2) | 1.0 (0.5) | 1.3 (1.5) | 0.33 |
| Perioperative acid-base balance (SD) | 7.39 (0.01) | 7.41 (0.05) | 7.38 (0.09) | 0.05 |
TTA: Transtibial amputation; TFA: Transfemoral amputation.