Table 4.
Comparison Between Hypothermia and Normothermia Groups.
| Hypothermia | Normothermia | P-value | ||
|---|---|---|---|---|
| n | 40 | 63 | ||
| Age, yr | 14.3 | 14.6 | 0.438 | |
| Sex, n | M: 12 | M: 16 | 0.609 | |
| F: 28 | F: 47 | |||
| Diagnosis, n | AIS: 16 | AIS: 40 | 0.02* | |
| non-AIS: 24 | non-AIS: 23 | |||
| Height, cm | 147.9 | 152.7 | 0.053 | |
| Weight, kg | 36.1 | 44.5 | <0.001* | |
| Body mass index, kg/m2 | 16.3 | 18.9 | <0.001* | |
| Operative time, min | 335.5 | 296.6 | 0.05 | |
| Estimated blood loss, mL | 1218.6 | 877.3 | 0.019* | |
| Number of fused vertebrae, n | 12.9 | 11.1 | 0.008* | |
| Preoperative Cobb angle, degrees | 79.6 | 63.7 | 0.002* | |
| Core body temperature | Initial, °C # | 36 | 36.6 | <0.001* |
| Beginning of surgery, °C | 35.9 | 36.4 | <0.001* | |
| End of surgery, °C | 36.3 | 37.1 | <0.001* | |
| Time from end of surgery to extubation, min | 36.3 | 40.5 | 0.217 | |
| Hospital stay, days | 24.6 | 21.7 | 0.377 | |
| Postponed extubation, % | 25 | 9.5 | 0.035* | |
| Complications, % | 35 | 19 | 0.069 | |
| Surgical site infection, % | 12.5 | 11.1 | 0.83 | |
Abbreviations: AIS, adolescent idiopathic scoliosis
# Measured immediately after induction of anesthesia
*P<0.05
Patients in the Hypothermia group were more likely to have a diagnosis of non-AIS, lower BMI, larger EBL, greater number of fused vertebrae, larger preoperative Cobb angle, lower core body temperature at the time of anesthesia induction, and higher rate of postponed extubation. We could not find a statistically significant difference in the rate of perioperative complications and surgical site infection between the two groups.