Li Le, Stampas Argyrios, Shin Henry, Li Xiaoyan, Zhou Ping
Department of Physical Medicine and Rehabilitation, University of Texas Health Science Center at Houston, Houston, TX, United States.
TIRR Memorial Hermann Research Center, Houston, TX, United States.
Front Neurol. 2017 Jun 20;8:253. doi: 10.3389/fneur.2017.00253. eCollection 2017.
This study assessed electrical impedance myography (EIM) changes after spinal cord injury (SCI) with a localized multifrequency technology. The EIM measurement was performed on the biceps brachii muscle at rest condition of 17 cervical SCI subjects, and 23 neurologically intact subjects as control group. The results showed that there was a significant decrease in muscle reactance (X) and phase angle (θ) at selected frequencies (i.e., 50 and 100 kHz) in SCI compared to control. There was no significant difference in muscle resistance (R) between the two groups. The anisotropy examination revealed that SCI group had a decreased anisotropy ratio in resistance. In addition, the multifrequency spectrum analysis showed a decreased slope of the log(freq)-resistance regression in SCI group when compared to healthy control. Findings of the EIM changes are related to inherit muscle changes after the injury. Since EIM requires no patient effort and is quick and convenient to conduct, it may provide a useful tool for examination of paralyzed muscle changes after SCI.
本研究采用局部多频技术评估脊髓损伤（SCI）后肌电阻抗图（EIM）的变化。对17例颈髓损伤受试者肱二头肌在静息状态下进行EIM测量，并以23例神经功能正常的受试者作为对照组。结果显示，与对照组相比，SCI组在选定频率（即50和100kHz）下肌肉电抗（X）和相位角（θ）显著降低。两组之间肌肉电阻（R）无显著差异。各向异性检查显示，SCI组电阻各向异性比率降低。此外，多频谱分析显示，与健康对照组相比，SCI组log（频率）-电阻回归斜率降低。EIM变化的结果与损伤后肌肉的内在变化有关。由于EIM无需患者用力，操作快速简便，它可能为检查SCI后瘫痪肌肉的变化提供一种有用的工具。
