Objective To investigate the effects of thyroid hormone on extremely severe traumatic brain injury (TBI).Methods A retrospective case-control study was conducted to analyze the treatment of 105 patients with extremely severe TBI admitted from July 2010 to April 2014.There were 79 males and 26 females,with an average age of 32.9 years.The patients were divided into conventional treatment group (Group A,35 cases),conventional treatment ± thyroxine treatment group (Group B,35 cases) and thyroxine treatment group after the condition that thyroxine level was low (Group C,35 cases) according to the random number table method.The incidence of low T3 and T4,incidence of hypotension,the dosage of vasoactive drugs,function evaluation of liver and kidney damage,Glasgow outcome scale (GOS),and acute physiology and chronic health evaluation Ⅱ (APACHE Ⅱ) within 20 days after admission,and mortality rate within 30 days after admission were compared and analyzed.Results Within 20 days after admission,the rates of low thyroxine levels and hypotension of the Group B (22.9％,77.1％) were significantly lower than those in the other two groups (Group A:40％,100％;Group C:37％,100％) (all P ＜ 0.05).The doses of dopamine and norepinephrine in Group B was significantly lower than the other two groups and the combination rate of vasopressors in Group B was significantly lower than the other two groups (P ＜ 0.05),while there was no significant difference between Group A and Group C (P ＞ 0.05).The corresponding data in Group A and Group C had no statistically significant difference (P ＞ 0.05).The liver and renal dysfunction rates of Group B (29％,31％) were significantly lower than those of the other two groups (Group A:49％,51％;Group C:43％,51％) (all P ＜ 0.05).The corresponding data in Group A and Group C had no statistically significant difference (P ＞ 0.05).GOS in Group B [(4.8 ± 1.9) points] was significantly higher than that in Group A [(3.3 ± 0.2) points] (all P ＜ 0.05) within 30 days after admission and significantly higher than that of itself at the beginning [(3.6 ± 1.1) points] (P ＜ 0.05).The APACHE Ⅱ in Group A was significantly higher than those in other two groups as well as that in Group A at admission (P ＜ 0.05).Mortality rates in Group B (31％) and Group C (29％) were significantly lower than that in Group A (69％) within 30 days after admission (P ＜ 0.05).Conclusions Thyroxine can reduce the incidence of hypotension,liver and kidney injury rate in extremely severe TBI.Prevention is better than the supplementary treatment after severe TBI.Thyroxine can also reduce the mortality of extremely severe TBI within 30 days after admission.

目的 回顾分析脑死亡患者不同时机的甲状腺素治疗,并探讨甲状腺素对血压和器官功能的影响.方法 对收治和转入的137例脑死亡患者按甲状腺素治疗时机分为3组:对照组43例,只给予常规治疗;预防组52例,除常规治疗外,入组时即给予甲状腺素片50 μg/d;补充组42例,除常规治疗外,在测定发现甲状腺素水平低下后补充甲状腺素片50 μg/d.对比分析各组低T3、T4发生率、低血压发生率、血管活性药用量和肝肾功能等.结果 入组后20 d内,预防组低甲状腺素水平和低血压发生率低于其他两组,补充组低于对照组,差异有统计学意义(P<0.05);平均多巴胺和去甲肾上腺素用量补充组低于对照组,预防组低于其他两组,差异有统计学意义(P<0.05);联合用药率和肝肾功能异常率预防组低于其他两组,补充组肝肾功能损伤发生率低于对照组,预防组低于其他两组,差异有统计学意义(P<0.05).结论 甲状腺素片可以降低脑死亡患者的低甲状腺素水平和低血压发生率,减少血管活性药用量,并进一步降低肝肾功能损伤率,且预防效果优于补充治疗.