Abstract

目的 研究臂丛损伤后神经移位端侧缝合寄养法是否有预防失神经支配骨骼肌肌萎缩的作用.方法 64只SD大鼠随机分成两组.对照组:切断肌皮神经,造成肱二头肌失神经支配.实验组:切断肌皮神经后,胸内侧神经分支移位与肌皮神经远端作端侧缝合寄养失神经支配的肱二头肌.术后2、4、6、8周观察大鼠的行为变化与肱二头肌的萎缩程度,检测肱二头肌肌肉纤颤电位或再生电位、肱二头肌肌肉湿重、肌纤维截面积和Na-K-ATP酶活性.以左侧为实验侧,右侧为自身对照侧,将左侧测量值除以右侧测量值,求各观察值恢复率,比较组间各观察值的恢复率.结果 术后对照组随着失神经时间延长,肌肉萎缩程度逐渐加重,屈肘功能不能恢复,纤颤电位波幅逐渐下降,肌肉湿重、肌纤维截面积和酶的活性均逐渐下降;而实验组随着神经寄养时间的延长,肌肉萎缩程度逐渐减轻,屈肘功能逐渐恢复,出现再生电位,肌肉湿重、肌纤维截面积逐渐增加,酶活性逐渐升高,虽不及正常组,但明显不同于肌肉萎缩严重的失神经组.结论 神经移位端侧缝合寄养法可以有效地预防失神经支配骨骼肌肌萎缩。

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