Wu Y, Kunz J R, Putnam T D, Stratigos J S
Arch Phys Med Rehabil. 1983 Mar;64(3):117-20.
A simple technique is described for measuring the F-wave conduction time of the proximal segment of peripheral nerves. This should prove helpful in the diagnosis of a proximal neuropathy or myelopathy. The F wave (Fw) and M response at the wrist (Mw) and the M response at the axilla (Ma) can be used to calculate the conduction time, defined as Axillary F Central Latency (AFCL), between the spinal cord and the axilla, covering a horizontal distance of 25cm twice. The calculated AFCL (AFCL = (Mw + Fw) - 2Ma) in our control group of 30 normal subjects was 11.2 +/- 0.8 msec (mean and 1 standard deviation) for the ulnar or median nerve. An AFCL of more than 13.6 msec (mean plus 3SD), or a discrepancy of the AFCL greater than 2.1 msec in the same nerves between the 2 sides or between the median and ulnar nerves on the same side suggests an abnormality involving the proximal nerve segment. The prolonged AFCL has been found in patients with Guillain-Barré syndrome (GBS), brachial plexus lesions, syringomyelia and, in a few cases, with thoracic outlet syndrome (TOS).
本文描述了一种测量外周神经近端节段F波传导时间的简单技术。这在近端神经病或脊髓病的诊断中应会有所帮助。腕部的F波（Fw）和M反应（Mw）以及腋窝处的M反应（Ma）可用于计算传导时间，定义为脊髓与腋窝之间的腋-中枢潜伏期（AFCL），该距离两次覆盖25厘米的水平距离。在我们30名正常受试者的对照组中，尺神经或正中神经的计算得出的AFCL（AFCL = (Mw + Fw) - 2Ma）为11.2 +/- 0.8毫秒（平均值和1个标准差）。AFCL超过13.6毫秒（平均值加3个标准差），或者两侧同一神经的AFCL差异大于2.1毫秒，或者同侧正中神经和尺神经之间的AFCL差异大于2.1毫秒，提示近端神经节段存在异常。在格林-巴利综合征（GBS）、臂丛神经损伤、脊髓空洞症患者以及少数胸廓出口综合征（TOS）患者中发现了AFCL延长。
