Casazza B A, Young J L, Press J P, Heinemann A W
Department of Physical Medicine and Rehabilitation, Rehabilitation Institute of Chicago, Northwestern University Medical School, Illinois, USA.
Electromyogr Clin Neurophysiol. 1998 Apr-May;38(3):153-60.
An electromyographic examination is often utilized to confirm the diagnosis of suprascapular neuropathy in patients with shoulder pain and dysfunction. The purpose of this study was to compare three compound motor action potential (CMAP) recording methods (surface electrode, monopolar needle, concentric needle) for evaluating suprascapular nerve conduction. Twenty-two normal, healthy subjects were tested with each method. Differences between the recording methods were noted for CMAP latencies and amplitudes with the monopolar needle recordings having the shortest mean latency and greatest mean amplitude. The monopolar needle recordings also appeared to give a more reproducible measurement of CMAP latency and evoked amplitude to the supraspinatus and infraspinatus. Therefore, it may be more accurate to use a monopolar needle to record suprascapular nerve conduction and determine abnormalities with a side-to-side latency difference of 0.4 ms being acceptable. Considering the diverse branching of the suprascapular nerve, and the monopolar needle's relatively small sampling area of motor fibers, it may be prudent to test conduction to multiple sites within these muscles for the most accurate assessment.
肌电图检查常用于确诊肩痛和功能障碍患者的肩胛上神经病变。本研究旨在比较三种复合肌肉动作电位（CMAP）记录方法（表面电极、单极针电极、同心针电极）评估肩胛上神经传导的情况。对22名正常健康受试者分别采用这三种方法进行测试。记录方法之间在CMAP潜伏期和波幅方面存在差异，单极针电极记录的平均潜伏期最短，平均波幅最大。单极针电极记录似乎也能更可重复地测量CMAP潜伏期以及冈上肌和冈下肌的诱发电位波幅。因此，使用单极针电极记录肩胛上神经传导并以双侧潜伏期差异0.4 ms为可接受范围来确定异常情况可能更为准确。考虑到肩胛上神经分支多样，且单极针电极对运动纤维的采样区域相对较小，为获得最准确的评估，对这些肌肉内的多个部位进行传导测试可能更为谨慎。
