Troni W, Bianco C, Coletti Moja M, Dotta M
Institute of Neurology, University of Turin, Italy.
Muscle Nerve. 1996 May;19(5):595-604. doi: 10.1002/(SICI)1097-4598(199605)19:5<595::AID-MUS7>3.0.CO;2-6.
The site of S1-S2 root activation following percutaneous high-voltage electrical (ES) and magnetic stimulation were located by analyzing the variations of the time interval from M to H soleus responses elicited by moving the stimulus point from lumbar to low thoracic levels. ES was effective in activating S1-S2 roots at their origin. However supramaximal motor root stimulation required a dorsoventral montage, the anode being a large, circular surface electrode placed ventrally, midline between the apex of the xiphoid process and the umbilicus. Responses to magnetic stimuli always resulted from the activation of a fraction of the fiber pool, sometimes limited to the low-thresholds afferent component, near its exit from the intervertebral foramina, or even more distally. Normal values for conduction velocity in motor and 1a afferent fibers in the proximal nerve tract are provided.
通过分析将刺激点从腰椎水平移动到下胸部水平时，比目鱼肌从M波到H波反应的时间间隔变化，来确定经皮高压电刺激（ES）和磁刺激后S1 - S2神经根的激活部位。ES能有效地在S1 - S2神经根起始处激活它们。然而，超强运动神经根刺激需要采用背腹位电极组合，阳极是一个大的圆形表面电极，置于剑突尖与脐连线中点的腹侧。磁刺激的反应总是由部分纤维束的激活引起，有时仅限于低阈值传入成分，靠近其从椎间孔穿出的部位，甚至更远端。文中提供了近端神经束中运动和1a传入纤维传导速度的正常值。
