Wee A S, Ashley R A
Department of Neurology University of Mississippi Medical Center, Jackson.
Electromyogr Clin Neurophysiol. 1990 Feb-Mar;30(2):93-6.
In 15 normal subjects, antidromic median sensory compound nerve action potentials (SCNAPs) were recorded supramaximally from the middle finger with ring electrodes, using different interelectrode recording distances. The onset latencies were identical in all recording instances. The peak latency and amplitude of the major negative deflection continued to increase with increasing interelectrode distance. At and beyond a 4 cm interelectrode recording separation, they both achieved maximum values and did not increase further. On the other hand, the duration and area did continue to increase with increasing interelectrode separation. These findings suggest that in normal individuals, the true onset latency, peak latency, and amplitude are well reflected in the median SCNAP when it is recorded with an interelectrode distance of 4 cm or more at the finger; thus, they can easily be standardized. The SCNAP duration and area, however, are more variable since they both continue to change with increasing interelectrode recording separation without approaching a saturation value.
在15名正常受试者中，使用不同的电极间记录距离，用环形电极从中指超最大刺激记录逆向正中感觉复合神经动作电位（SCNAPs）。在所有记录情况下，起始潜伏期均相同。主要负向波的峰值潜伏期和波幅随着电极间距离的增加而持续增加。在电极间记录间距达到4厘米及以上时，两者均达到最大值且不再进一步增加。另一方面，波宽和面积确实随着电极间间距的增加而继续增大。这些发现表明，在正常个体中，当在手指处电极间距离为4厘米或更大时记录正中SCNAP，其真正的起始潜伏期、峰值潜伏期和波幅能得到很好的反映；因此，它们很容易标准化。然而，SCNAP的波宽和面积更具变异性，因为它们都随着电极间记录间距的增加而持续变化，且未趋近饱和值。
