下肢节段性神经根刺激H反射

探索理想的诊断腰骶神经根病的神经电生理技术。采用高压短脉冲电刺激技术直接刺激神经根，在比目鱼肌及半腱肌记录Ｈ反射，共检测正常人３０例，Ｓ１及Ｌ５神经根病２０例。（１）测定了比目鱼肌及半腱肌神经根刺激Ｈ反射正常值。（２）半腱肌和经目鱼肌ＮＲＳＨ在正常人可１００％记录到。９３）Ｌ５Ｓ１椎间隙及Ｓ１神经孔刺激，比目鱼肌及 半腱肌ＮＲＳＨ各参数相差均不显著。（４）单纯Ｓ１神经根病仅比目鱼肌ＮＲＳＨ异常，而

Segmental H-reflex to spinal nerve root stimulation

To develop a method of clinical electrodiagnosis of radiculopathy. Methods: Percutaneous high voltage electrical stimulation over the lumbosacral root was used. The H-reflex was recorded from soleus muscle (S_1) and semitendinosus muscle(L_5). 60 normal subjects and 20 cases of S_1 and 20 cases of L_5 radiculopathies were examined. Results: The normal value of H-M interval and its side-to-side difference were detected. Whether the cathodal stimulation was over S1 foramen or L_5S_1 intervertebra, M latency, H latency, H-M interval of soleus and semitendinosus H-reflex were not changed significantly. Both soleus and semitendinosus H-reflex could be recorded in all normal subjects. In S_1 radiculopathies, only soleus H-reflex was abnormal and semitendinosus H-reflex was normal. In L_5 radiculopathies, semitendinosus H-reflex was abnormal and soleus H-reflex was normal. Conclusion: Percutaneous high voltage stimulation of lumbosacral root elicited H-reflex could be recorded reliably. Both sensory and motor nerve fiber has a lower threshold site near its exit site in the vertebral foramina when moderate intensity of electrical stimulation was used. There is high specificity in segmental H-reflex consisting of solues(S_1) and semitendinosus (L_5) H-reflex.