Table 2.
Patient Surgical and Anesthetic Characteristics in Normothermic and Hypothermic Patient Groups
| Variable | N Total (N = 869) | Normothermic, ≥36°C (N = 762) | Hypothermic, <36°C (N = 107) | P |
|---|---|---|---|---|
| Admission type, n (%) | ||||
| Day surgery | 439 (50.6) | 373 (49.0) | 66 (61.7) | 0.017 |
| Inpatient | 429 (49.4) | 388 (51.0) | 41 (38.3) | |
| Surgical type, n (%) | ||||
| Elective | 654 (81.7) | 566 (80.4) | 88 (90.7) | 0.012 |
| Emergency | 147 (18.4) | 138 (19.6) | 9 (9.28) | |
| Surgery, n (%) | ||||
| Minor | 572 (66.8) | 489 (64.9) | 83 (79.1) | 0.004 |
| Major | 286 (33.3) | 264 (35.1) | 22 (21.0) | |
| Surgery site, n (%) | ||||
| Head and neck | 342 (39.5) | 305 (40.2) | 37 (34.6) | 0.292 |
| Chest | 22 (2.54) | 17 (2.24) | 5 (4.67) | 0.177 |
| Abdomen | 120 (13.9) | 113 (14.9) | 7 (6.54) | 0.017 |
| Back | 7 (0.81) | 6 (0.79) | 1 (0.93) | 0.604 |
| Upper limb | 77 (8.89) | 69 (9.09) | 8 (7.48) | 0.717 |
| Lower limb | 78 (9.01) | 67 (8.83) | 11 (10.3) | 0.590 |
| Urology | 162 (3.34) | 134 (15.5) | 28 (3.23) | 0.034 |
| Duration of surgery (min) | 53.5 ±60.0 | 55.0 ± 60.6 | 42.2 ± 54.8 | 0.019 |
| (N = 853) | (N = 750) | (N = 103) | ||
| Blood loss (mL/kg), mean ± SD, median (IQR) | 0.37 ± 1.67 | 0.40 ± 1.72 | 0.19 ± 1.27 | 0.135 |
| 0 (0, 0) | 0 (0, 0) | 0 (0, 0) | 0.022 † | |
| (N = 864) | (N = 757) | (N = 107) | ||
| Anesthesia technique, n (%) | ||||
| General anesthesia | 869 (100) | 762 (100) | 107 (100) | 0.603 |
| Central neuraxial block | 34 (4.07) | 30 (4.09) | 4 (3.88) | 1.00 |
| Peripheral neuraxial block | 171 (20.2) | 141 (19.0) | 30 (28.9) | 0.026 |
| Anesthesia time (min) | 65.7 ± 66.5 | 67.4 ± 67.0 | 53.1 ± 61.5 | 0.009 |
| (N = 852) | (N = 750) | (N = 102) | ||
| Blood used (mL/kg), mean ± SD, | 0.12 ± 1.26 | 0.12 ± 1.27 | 0.12 ± 1.24 | 0.994 |
| (N = 828) | (N = 726) | (N = 102) | ||
| Vol. warmed crystalloid (mL/kg), mean ± SD | 11.6 ± 13.9 | 11.7 ± 14.4 | 10.6 ± 7.24 | 0.383 |
| (n = 509) | (n = 461) | (n = 48) |
Bold is for significant P value <0.05.
†Wilcoxon rank-sum test.