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目的探讨周围神经损伤后运动神经传导速度(MCV)改变与靶肌肌力级别的相关性。方法 60例病程6个月以上的单侧肢体神经损伤(正中神经12例、尺神经13例、桡神经13例、腓浅神经12例、腓深神经10例)患者,根据Lovett肌力0～5级分级标准,确定受损神经支配的靶肌的肌力;采用DNI-200+型肌电诱发仪行患侧与健侧肢体MCV检查,观察不同级别肌力靶肌MCV指标变化。结果所测5种神经MCV各指标(健侧-患侧)/健侧变化率均与靶肌肌力呈逐渐降低的变化趋势,存在显著负相关性,其中波幅和面积下降率在肌力2级与3级、4级与5级组间存在显著性差异(P<0.05)。潜伏期延长率和传导速度下降率在肌力1级与2级、4级与5级组间存在显著性差异(P<0.05)。结论 MCV与周围神经损伤有较好的相关性,可用于推断神经受损程度,并有助于肌力级别的判定,是评价周围神经损伤程度的客观方法。
Objective To investigate the relationship between motor nerve conduction velocity (MCV) changes and muscle strength of target muscle after peripheral nerve injury. Methods Sixty patients with unilateral limb nerve injury (including 12 cases of median nerve, 13 cases of ulnar nerve, 13 cases of radial nerve, 12 cases of peroneal nerve, 10 cases of peroneal nerve) 5 grading standards to determine the muscle strength of the target muscle at the expense of the injured nerve. MCV examination was performed on the ipsilateral and contralateral limbs using DNI-200 + EMG instrument to observe the changes of MCV index in different levels of muscle target muscle. Results The changes of 5 indexes of MCV (contralateral-ipsilateral / contralateral) and the muscle strength of target muscle showed a decreasing trend, and there was a significant negative correlation between the changes of amplitude and area in muscle strength 2 There was a significant difference between grade 3, grade 4 and grade 5 (P <0.05). There was a significant difference between the 1st and 2nd, 4th and 5th level in muscle strength (P <0.05). Conclusion MCV and peripheral nerve injury have a good correlation, can be used to infer the degree of nerve damage, and contribute to the determination of muscle strength, is to evaluate the extent of peripheral nerve damage objective method.