Motor Evoked Potential by Magnetic Stimulation

运动诱发电位(MEP)是通过高压电刺激记录到的。与电刺激相比，磁刺激是非侵入性的。但线圈产生的磁场力的分布还没有得到准确的研究。然后，在狗身上，通过经颅磁刺激从颈椎水平的臂肌和硬膜外间隙记录MEP。接下来，作为临床研究，观察偏瘫患者从双侧较薄的肌肉记录的MEP的幅度和潜伏期。2：麻醉犬从臂肌记录MEP，潜伏期约为6-8毫秒。从硬膜外间隙记录的MEP由两个对应于电刺激的负峰组成。3.偏瘫患者未记录MEP。在偏瘫患者中，MEP有低波幅和潜伏期延长的趋势，但不能准确评估运动功能。经颅磁刺激是一种无创的方法。磁刺激的MEP将有助于运动功能的研究。

Motor evoked potential (MEP) has been recorded by high voltage electrical stimulation. Magnetic stimulation, in contrast with electrical stimulation, is non invasive. But distribution of magnetic force generated by the coil has not been studied accurately.And then in dogs, MEP by transcranial magnetic stimulation is recorded from brachial muscle and epidural space at cervical level.Next, as clinical study, amplitude and latency of MEP recorded from the bilateral thiner muscle are investigated in the patients with hemiparesis.The following results are obtained.1 : Magnetic induction flux density is greater at the edge of the coil than center. 2 : In anesthesied dogs, MEP is recorded from the brachial muscle, which latency is about 6-8msec. And MEP recorded from epidural space consist of two negative peaks corresponding to the electrical stimulation. 3 : In the patients with hemiplegia, MEP is not recorded. In the patients with hemiparesis, MEP has a tendency to be low amplitude and prolongation of latency, but it is not possible to evaluate motor function precisely.Transcranial magnetic stimulation is non invasive. MEP by magnetic stimulation will be useful for investigation of motor function.