The effect of controlled mild hypothermia on large scald burns in a resuscitated rat model

• Published in: Clinical and experimental emergency medicine 2014-09, Vol.1 (1), p.56-61
• Main Authors: Tan, Nhi, Thode, Jr, Henry C, Singer, Adam J
• Format: Article
• Language: English
• Subjects: burns; Original; rats; resuscitation
• ISSN: 2383-4625; 2383-4625
• DOI: 10.15441/ceem.14.027

Early surface cooling of burns reduces pain, depth of injury and improves healing. We hypothesized that controlled mild hypothermia would also prolong survival in a fluid resuscitated rat model of large scald burns. Forty rats were anesthetized and a single full-thickness scald burn covering 40% of total body surface area was created on each of the rats. The rats were then randomized to hypothermia (n=20) or no hypothermia (n=20). Mild hypothermia (a reduction of 2°C) was induced with intraperitoneal 4°C normal saline and ice packs. After 2 hours of hypothermia, the rats were rewarmed back to their baseline temperature with a heating pad. The control rats received room temperature intraperitoneal saline. The difference in survival between the groups was determined using Kaplan-Meier analysis and the log-rank test. Hypothermia was induced in all experimental rats within a mean of 22 minutes (95% confidence interval, 17 to 27). The number of normothermic and hypothermic rats that expired at each time interval were: at 1 hour, 4 vs. 0; at 10 hours, 2 from each group; at 24 hours, 0 vs. 1; at 48 hours, 2 vs. 2; at 72 hours, 1 vs. 1; and at 120 hours, 1 vs. 1 respectively. There were no differences in time to survival between the groups. Induction of brief, mild hypothermia does not prolong survival in a resuscitated rat model of large scald burns.