中文摘要：

目的 探讨脓毒症因素对维库溴铵抑制大鼠神经肌肉接头乙酰胆碱（Ach）释放的影响.方法 SPF级成年雄性SD大鼠36只,体重200～ 220 g,年龄2～3个月,采用随机数字表法分为3组（n=12）：正常对照组（C组）、假手术组（S组）以及脓毒症组（Sep组）.采用盲肠结扎穿孔法制备脓毒症模型.脓毒症建模后12h时,取坐骨神经-胫前肌,在培养液中加入维库溴铵,终浓度为0.08 μg/ml,孵育15 min.于给药前和给药后采用细胞内微电极法记录神经肌肉接头终板电位（EPP）和微终板电位（MEPP）,并计算EPP/MEPP比值.结果 与C组和S组比较,Sep组给药前后坐骨神经-胫前肌EPP、MEPP和EPP/MEPP比值升高（P＜0.05）;与给药前比较,3组给药后坐骨神经-胫前肌EPP、MEPP以及EPP/MEPP比值降低（P＜0.05）.结论 脓毒症可促进大鼠神经肌肉接头Ach的释放,从而减弱维库溴铵抑制神经肌肉接头Ach释放的作用.

英文摘要：

Objective To investigate the effect of sepsis on vecuronium-induced inhibition of acetylcholine release in neuromuscular junction in rats.Methods Thirty-six adult male SPF SpragueDawley rats,aged 2-3 months,weighing 200-220 g,were randomly divided into 3 groups （n=12 each） using a random number table：control group （group C）,sham operation group （group S） and sepsis group （group Sep）.Sepsis was induced by cecum ligation and puncture （CLP） in rats anesthetized with intraperitoneal chloral hydrate 350 mg/kg.At 12 h after CLP,the sciatic nerve-pretibial muscle was prepared.Vecuronium was added to the culture medium with the final concentration of 0.08 μg/ml,and the sciatic nerve-pretibial muscle was incubated for 15 min.Before and after administration,evoked endplate potentials （EPPs） and miniature endplate potentiais （MEPPs） were recorded by using intracellular microelectrode.EPP/MEPP ratio was calculated.Results Compared to C and S groups,EPPs,MEPPs and EPP/MEPP ratio were significantly increased before and after administration in group Sep.EPPs,MEPPs and EPP/MEPP ratio were significantly lower after administration than before administration in the three groups.Conclusion Sepsis can promote acetylcholine release in neuromuscular junction,thus weakening vecuronium-induced inhibition of acetylcholine release in neuromuscular junction in rats.