Loong S C, Seah C S
J Neurol Neurosurg Psychiatry. 1971 Dec;34(6):750-4. doi: 10.1136/jnnp.34.6.750.
Recording of median and ulnar digital sensory nerve action potentials in normal subjects showed that the ratio of the median (index finger) to ulnar (little finger) potential amplitude was consistently greater than one. In 15 patients with the carpal tunnel syndrome (seven bilateral) this ratio was found to be less than one for all but two of the 22 clinically affected hands, including three of the four hands with a normal motor latency to threshold stimulation and four of the five hands with a normal sensory conduction. It is concluded that the estimation of the ratio of the median to ulnar sensory potential amplitude is a sensitive test in the diagnosis of the carpal tunnel syndrome and is particularly useful in those patients who show a normal motor latency and sensory conduction.
对正常受试者的正中神经和尺神经指感觉神经动作电位进行记录，结果显示，正中神经（示指）与尺神经（小指）电位幅度之比始终大于1。在15例腕管综合征患者（7例双侧患病）中，22只临床受累手（除2只手外）的该比值均小于1，其中包括4只对阈值刺激运动潜伏期正常的手中的3只，以及5只感觉传导正常的手中的4只。结论是，正中神经与尺神经感觉电位幅度之比的评估是诊断腕管综合征的一项敏感测试，对那些运动潜伏期和感觉传导正常的患者尤为有用。
