正常人前臂内侧皮神经感觉传导研究

Sensory conduction of medial antebrachial cutaneous nerve

首次研究应用逆向法测定正常人前臂内侧皮神经短潜伏期体感诱发电位（ｓｈｏｒｔ ｌａｔｅｎｃｙｓｏｍａｔｏｓｅｎｓｏｒｙ ｅｖｏｋｅｄ ｐｏｔｅｎｔｉａｌｓ），并研究其感觉动作电位（ｓｅｎｓｏｒｙ ｎｅｒｖｅ ａｃｔｉｏｎ ｐｏｔｅｎｔｉａｌ）。方法：（１）ＳＮＡＰ：肱骨内上髁前外侧平均２．６ｃｍ处表面双极刺激，前臂军面内侧平均１０．３ｃｍ，处记录ＳＮＡＰ． （２）ＳＬＳＥＰ：上述刺激位置不变，用四道程记录锁骨上、颈_７棘突、对侧顶区（Ｐ_３／Ｐ_４）相应的Ｎ_９、Ｎ_（１３）、Ｎ_（２０）诱发电位。通过分别对Ｎ_９、Ｎ_（１３）、Ｎ_（２０）的潜伏期、Ｎ９－Ｎ（１３）峰间潜伏期与臂长的相关分析，认为峰间潜伏期及自身双侧对照的潜伏期差值和波幅比值为临床可靠指标，可望对胸廓出口综合征（ＴＯＳ）早期诊断有指导意义。

This report describes an antidromic technique for measuring sensory nerve action potential （SNAP） of the medial antebratchial cutaneous nerve （MACN ） , and the technique for detecting the short latency somatosensory evoked potentials （ SLSEP ） of MACN in 1 5 （ 30 sides ） normal subjects. Surface stimulation was done at the elbow 2 - 3. 5 （ 2. 6 ） cm anterolateral to the medial epicondyle. Recordings were made at the medial forearm 9. 5 - 1 l. 6（10. 3）cm distally for SNAP , at the Erb’s point for N9 , at the C7 cervical spinal process for N13 and at the contralateral scalp（P3/P4） for N20 （international 10 - 20 system ） . The respective latency , amplitude , conduction velocity were measured. The correlation analysis between the arm length and various evoked potentials showed N9- N13 conduction time and the difference between sides provicletl more reliable and sensitive clinical data. Such normal values of MACN may suggest an early objective test for diagnosing thoracic outlet syndrome （TOS）.