Valls J, Llanas J M
EMG Department (Service of Neurology), Hospital Clínico y Provincial, Barcelona, Spain.
Muscle Nerve. 1988 Jun;11(6):546-52. doi: 10.1002/mus.880110605.
Fourth finger stimulation has been used to obtain the compound nerve action potential (CNAP) of the median and ulnar nerves by a single cutaneous bipolar recording electrode placed in some specific sites of the upper limb. In normal subjects, the response was a combination of both action potentials which could be seen as separated peaks only when the recording was made at midarm with the elbow flexed at 90 degrees. This finding is mainly attributed to the longitudinal sliding of nerves according to the joint movements. In patients with a carpal tunnel syndrome, there were a striking separation between the responses of both nerves in wrist recording. This finding allows this technique to be applied in the clinical inspection of median nerve entrapment at wrist, demonstrating graphically the delay on the median nerve action potential with regard to that of the ulnar nerve.
通过将单个皮肤双极记录电极置于上肢的某些特定部位，利用刺激无名指来获取正中神经和尺神经的复合神经动作电位（CNAP）。在正常受试者中，该反应是两种动作电位的组合，只有当肘部弯曲90度在手臂中部进行记录时，才可以将其视为分离的峰值。这一发现主要归因于神经随关节运动的纵向滑动。在患有腕管综合征的患者中，腕部记录时两条神经的反应存在明显分离。这一发现使得该技术可应用于腕部正中神经卡压的临床检查，直观地显示出正中神经动作电位相对于尺神经动作电位的延迟。
