摘要
目的 采用在体电生理法评价脊髓κ受体在瑞芬太尼诱发切口痛大鼠术后中枢敏化中的作用.方法 取鞘内置管成功的成年SD大鼠60只,体重230～ 270 g,采用随机数字表法分为5组（n=12）：对照组（C组）、切口痛组（I组）、瑞芬太尼组（R组）、瑞芬太尼＋切口痛组（R＋I组）、κ受体激动剂U50488H组（U组）.R组静脉输注瑞芬太尼10 μg·kg-1·min-1持续1 h;R＋I组静脉输注瑞芬太尼10μg·kg-1·min-1持续1h的同时制备切口痛模型;U组鞘内注射U50488H10 μg/10μl,30 min后静脉输注瑞芬太尼10 μg·kg-1·min-11 h,制备切口痛模型.随机取6只大鼠,于鞘内置管前（T0）,术前（T1）以及术后1、4h、1、2和3d（T2～6）时测定双侧后爪机械痛阈.随机取6只大鼠,于给药前或术前60 min至给药结束后或术后180 min,采用细胞外记录技术测定脊髓背角C纤维诱发场电位,记录LTP诱发情况和C纤维诱发场电位曲线下面积（AUC）.结果 C组、I组和U组均未记录到LTP,R组和R＋I组均记录到LTP.与C组比较,R组T5.6时双侧机械性痛阈降低,I组T2～6时术侧机械痛阈降低,R＋I组T2～6时术侧机械痛阈、T5.6时非术侧机械痛阈降低,U组T2～4时术侧机械痛阈降低,R组和R＋I组脊髓背角C纤维诱发场电位AUC明显增加（P＜0.05）.与I组比较,R＋I组T4～6时术侧、T56时非术侧机械痛阈降低,脊髓背角C纤维诱发场电位AUC增加（P＜0.05）.与R＋I组比较,U组T2～6时术侧、T5.6时非术侧机械痛阈升高,脊髓背角C纤维诱发场电位AUC明显降低（P＜0.05）.结论 在电生理水平证实瑞芬太尼诱导切口痛大鼠术后中枢敏化的机制可能与抑制脊髓κ受体功能有关.
Objective To evaluate the role of spinal κ-opioid receptors in remifentanil-induced postoperative central sensitization in a rat model of incisional pain by in vivo electrophysiology.Methods Sixty adult male Sprague-Dawley rats in which intrathecal catheters were successfully implanted,weighing 230-270 g,were divided into 5 groups （n=12 each） using a random number table：control group （group C）,incisional pain group （group I）,remifentanil group （group R）,remifentanil plus incisional pain group （group R＋I）,and κ-opioid receptor agonist U50488H group （group U）.A 1 cm longitudinal incision was made through skin,fascia and muscle of the plantar aspect of the right hind paw in isofiurane-anesthetized rats to establish the model of incisional pain.Remifentanil was intravenously infused for 1 h at a rate of 10 μg · kg 1 · min-1 in group R.In group R＋I,remifentanil was intravenously infused for 1 h at a rate of 10 μg · kg-1 · min 1,and the model of incisional pain was established at the same time.In group U,U50488H 10 μg/10μl was injected intrathecally,30 min later remifentanil was intravenously infused for 1 h at a rate of 10 μg · kg-1 · min-1,and the model of incisional pain was established.Six rats in each group were randomly selected,the mechanical pain threshold （MPT） was measured in bilateral hind paws before implanting intrathecal catheter （T0）,before operation （T1）,and at 1 h,4 h and 1,2 and 3 clays after operation （T2-6）.Six rats in each group were randomly selected to record the C fiber-evoked filed potentials in the spinal dorsal horn from 60 min before administration or operation to 180 min after administration or operation,the long-term potentiation （LTP） induced was also recorded,and the area under the curve （AUC） of C-fiber-evoked field potentials was calculated.Results No LTP was recorded in C,I and U groups,and the LTP was recorded in R and R＋I groups.Compared with group C,the MPT in bilateral hind paws at T5,6 was significantly decrease
出处
《中华麻醉学杂志》
CAS
CSCD
北大核心
2016年第12期1448-1452,共5页
Chinese Journal of Anesthesiology
基金
国家自然科学基金（81360181）
宁夏医科大学特殊人才启动项目（XT201325）
2013年度人事厅留学人员科技活动项目
关键词
哌啶类
痛觉过敏
受体
阿片样
κ
脊髓
Piperidines
Hyperalgesia
Receptors,opioid,kappa
Spinal cord
