Hong C Z, Batkin F, Yu J, San Luis E B
University of California, Irvine Medical Center, Orange 92668.
Arch Phys Med Rehabil. 1988 Sep;69(9):685-8.
Axillary F-loop latencies (AFLL) were measured on median and ulnar nerves of 54 normal volunteers. The median and ulnar nerves were stimulated at the wrist and at the axilla 25cm distal to the sternal notch. The compound muscle action potentials were recorded from thenar and hypothenar muscles. Averaged tracings from 32 consecutive stimuli at the wrist were obtained. The averaged F-wave latencies were measured to the peak (Fwp) of the averaged F-wave. The M-wave latencies from wrist and axilla stimulation were measured to the onset of the wave (Mw and Ma, respectively). The averaged AFLL (a-AFLL) was calculated as (Fwp + Mw)-2 Ma. The average values of a-AFLL were 14.12 +/- 0.88msec for median nerve, and 13.97 +/- 0.90msec for ulnar nerve. There was no significant difference between male and female subjects, nor between the right and left sides. Seven subjects with EMG evidence of C8 or C8 to T1 radiculopathy, although manifesting normal AFLL gauged by the regular method (ie, measured to the onset of the shortest F-wave latency among eight tracings), had significantly longer "averaged AFLL" in both median and ulnar nerves of the affected side than the a-AFLL obtained from the normal side. It is concluded that the a-AFLL is a more sensitive measure than the "regular AFLL" in the assessment of proximal nerve lesion (especially C8 or C8 to T1 radiculopathy).
对54名正常志愿者的正中神经和尺神经进行了腋部F波潜伏期（AFLL）测量。分别在腕部和胸骨切迹远侧25cm处的腋部刺激正中神经和尺神经。从拇短展肌和小指展肌记录复合肌肉动作电位。获取腕部32次连续刺激的平均描记图。测量平均F波潜伏期至平均F波的峰值（Fwp）。测量腕部和腋部刺激的M波潜伏期至波的起始点（分别为Mw和Ma）。平均腋部F波潜伏期（a-AFLL）计算为（Fwp + Mw）- 2Ma。正中神经的a-AFLL平均值为14.12±0.88毫秒，尺神经为13.97±0.90毫秒。男性和女性受试者之间以及左右两侧之间均无显著差异。7名有肌电图证据显示C8或C8至T1神经根病的受试者，尽管用常规方法测量的AFLL正常（即测量8次描记图中最短F波潜伏期的起始点），但其患侧正中神经和尺神经的“平均腋部F波潜伏期”均明显长于正常侧获得的a-AFLL。结论是，在评估近端神经病变（尤其是C8或C8至T1神经根病）时，a-AFLL比“常规腋部F波潜伏期”更敏感。
