Wada N, Hasegawa O, Kirigaya N, Mimura E, Iino M
Division of Clinical Laboratory, Yokohama City University Hospital, Japan.
No To Shinkei. 2000 Jan;52(1):25-7.
We investigated characteristics of segmental motor conduction in the median and the ulnar nerves. Subjects were 55 individuals with normal conduction of the upper extremity and 71 patients with diabetes mellitus. Mean polyneuropathy index (PNI), which was determined as a mean percentage of the normal for 6 indices concerning to the conduction velocity in the upper limb, was 99.0% in the normal group and 85.6 % in the diabetic group on the mean. In the normal group distal latency was longer in the median nerve than in the ulnar nerve, and the conduction time between Erb's point and the wrist was longer in the ulnar nerve than the median nerve both in men and women. In the diabetic group these differences were accentuated; that means the distal latency was relatively more prolonged in the median nerve and the conduction time between Erb's point and the wrist was much longer in the ulnar nerve. Prolonged distal latency in the median nerve of women and conduction delay between Erb's point and the wrist in the ulnar nerve of men altogether resulted in the gender difference in the median minus ulnar F-wave latency after wrist stimulation in the diabetic group. Carpal tunnel segment of the median nerve and the elbow segment of the ulnar nerve are known to be common entrapment sites. This phenomenon of accentuated conduction delay in these common entrapment sites might be considered as a sort of 'double crush syndrome'.
我们研究了正中神经和尺神经的节段性运动传导特征。受试者包括55名上肢传导正常的个体和71名糖尿病患者。平均多神经病指数（PNI）通过上肢传导速度的6项指标相对于正常的平均百分比来确定，正常组平均为99.0%，糖尿病组平均为85.6%。在正常组中，正中神经的远端潜伏期比尺神经长，且在男性和女性中，尺神经从Erb点到腕部的传导时间比正中神经长。在糖尿病组中，这些差异更为明显；也就是说，正中神经的远端潜伏期相对延长更多，尺神经从Erb点到腕部的传导时间长得多。糖尿病组中，女性正中神经远端潜伏期延长以及男性尺神经从Erb点到腕部的传导延迟，共同导致了腕部刺激后正中神经与尺神经F波潜伏期差值的性别差异。正中神经的腕管段和尺神经的肘部段是常见的卡压部位。在这些常见卡压部位传导延迟加剧的现象可能被视为一种“双卡综合征”。
