Berger A R, Shahani B T
Department of Neurology, Montefiore Hospital and Medical Center, Bronx, New York.
Muscle Nerve. 1989 Dec;12(12):976-80. doi: 10.1002/mus.880121205.
Spinal cord motor conduction was determined by stimulating with a monopolar needle at the C5 cord level and recording evoked motor potentials from the ipsilateral tibialis anterior muscle. Minimal F wave and direct motor latencies from the peroneal nerve were used to calculate peripheral conduction time. Mean velocity index (defined as the distance from C5 to L4 divided by central conduction time) of 15 normal subjects was 64.9 m/sec (SD 7.5). In 5 patients with multiple sclerosis the mean velocity index was 40.6 m/sec (SD 6.5), whereas in 3 patients with cervical myelopathies, due to extradural compression, the mean velocity index was 32.8 m/sec. A repeat study in one of the latter patients, 4 days after removal of a C5 disc, documented a marked improvement in cord conduction. In a patient with a thoracic and cervical syrinx, cervical cord stimulation on the clinically affected side failed to evoke a motor potential, whereas the unaffected side was normal. This method provides a simple and effective way to evaluate spinal cord motor conduction using routine electrodiagnostic equipment.
脊髓运动传导通过在C5脊髓水平用单极针刺激并记录同侧胫前肌的诱发运动电位来测定。使用腓总神经的最小F波和直接运动潜伏期来计算周围传导时间。15名正常受试者的平均速度指数（定义为从C5到L4的距离除以中枢传导时间）为64.9米/秒（标准差7.5）。5例多发性硬化症患者的平均速度指数为40.6米/秒（标准差6.5），而3例因硬膜外压迫导致颈椎病的患者，平均速度指数为32.8米/秒。其中一名后者患者在切除C5椎间盘4天后进行的重复研究记录了脊髓传导的显著改善。在一名患有胸段和颈段空洞症的患者中，对临床受累侧的颈髓刺激未能诱发运动电位，而未受累侧正常。该方法提供了一种使用常规电诊断设备评估脊髓运动传导的简单有效方法。
