评估肘管正中神经病变的磁神经图。
Assessing ulnar neuropathy at the elbow using magnetoneurography.
机构信息
Department of Orthopedic Surgery, Graduate school of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan.
Department of Orthopedic Surgery, Graduate school of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan; Department of Advanced Technology in Medicine, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan.
出版信息
Clin Neurophysiol. 2024 May;161:180-187. doi: 10.1016/j.clinph.2024.02.030. Epub 2024 Mar 6.
OBJECTIVE
To measure neuromagnetic fields of ulnar neuropathy patients at the elbow after electrical stimulation and evaluate ulnar nerve function at the elbow with high spatial resolution.
METHODS
A superconducting quantum interference device magnetometer system recorded neuromagnetic fields of the ulnar nerve at the elbow after electrical stimulation at the wrist in 16 limbs of 16 healthy volunteers and 21 limbs of 20 patients with ulnar neuropathy at the elbow. After artifact removal, neuromagnetic field signals were processed into current distributions, which were superimposed onto X-ray images for visualization.
RESULTS
Based on the results in healthy volunteers, conduction velocity of 30 m/s or 50% attenuation in current amplitude was set as the reference value for conduction disturbance. Of the 21 patient limbs, 15 were measurable and lesion sites were detected, whereas 6 limbs were unmeasurable due to weak neuromagnetic field signals. Seven limbs were deemed normal by nerve conduction study, but 5 showed conduction disturbances on magnetoneurography.
CONCLUSIONS
Measuring the magnetic field after nerve stimulation enabled visualization of neurophysiological activity in patients with ulnar neuropathy at the elbow and evaluation of conduction disturbances.
SIGNIFICANCE
Magnetoneurography may be useful for assessing lesion sites in patients with ulnar neuropathy at the elbow.
目的
测量肘神经病变患者在电刺激后肘部的神经磁场，并以高空间分辨率评估肘部尺神经功能。
方法
超导量子干涉器件磁强计系统记录了 16 名健康志愿者的 16 只手臂和 20 名肘神经病变患者的 21 只手臂在腕部电刺激后肘部尺神经的神经磁场。去除伪迹后，将神经磁场信号处理成电流分布，并将其叠加到 X 射线图像上进行可视化。
结果
基于健康志愿者的结果，将 30m/s 的传导速度或 50%的电流幅度衰减设定为传导障碍的参考值。在 21 个患者肢体中，15 个可测量并检测到病变部位，而 6 个肢体由于神经磁场信号较弱而无法测量。7 个肢体的神经传导研究正常，但 5 个在磁神经图上显示传导障碍。
结论
测量神经刺激后的磁场能够可视化肘神经病变患者的神经生理活动，并评估传导障碍。
意义
磁神经图可能有助于评估肘神经病变患者的病变部位。
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