Electrode position and size in electrical impedance myography
Electrode position and size in electrical impedance myography
复制标题
DOI：
10.1016/j.clinph.2004.09.002
复制
发表时间：
2005-02-01
影响因子：
4.7
通讯作者：
Shiffman, CA
中科院分区：
文献类型：
--
作者：
Rutkove, SB;Partida, RA;Shiffman, CA
目的：线性电阻抗肌电图（EIM）是一种用于评估肌肉的非侵入性技术，其中高频交流电通过两个表面电极注入体内，并使用第二组较大的电极测量选定肌肉上的电压模式。电极的精确位置和尺寸对获得的数据至关重要，在这项研究中，这些因素的变化的影响进行了评估。方法：线性EIM在5名受试者中进行，同时改变电流注入电极的位置，并在另外8名受试者中进行，同时改变电压电极的位置。主要结果变量，“空间平均相位”（θ（avg）），随着同侧电流注入电极远离电压电极移动而降低，达到15-20 cm的平台。至于电压电极阵列，远-近端位移高达14%每厘米;周围的肢体周向位移有更温和的导致最大的变化，与变化θ（平均值）effects.Conclusions：线性EIM结果依赖于系统的电流和电压电极的位置，但与合理的护理变化可以最小化。重要性：只要注意电极的位置，线性EIM具有足够的重复性，可以成为神经肌肉疾病评估的重要临床工具。(C)2004年国际临床神经生理学联合会。由Elsevier爱尔兰有限公司出版。保留所有权利。
Objective: Linear-electrical impedance myography (EIM) is a non-invasive technique for the evaluation of muscle, in which high-frequency alternating current is injected into the body via two surface electrodes, and the resulting voltage pattern over a selected muscle is measured using a second, larger set of electrodes. The precise location and size of the electrodes can be critical to the data obtained, and in this study the effects of variation in these factors were evaluated.Methods: Linear-EIM was performed in 5 subjects while varying the location of the current injecting electrodes and in an additional 8 subjects while varying the position of the voltage electrodes.Results: The major outcome variable, the 'spatially averaged phase' (theta(avg)), decreased as the ipsilateral current injecting electrode was moved farther from the voltage electrodes, reaching a plateau 15-20 cm distant. As for the voltage electrode array, distal-proximal shifts being as high as 14% per cm; circumferential shifts around the limb had more modest resulted in the greatest changes, with variation in theta(avg) effects.Conclusions: Linear-EIM results depend systematically on current and voltage electrode positions, but with reasonable care variation can be minimized. Significance: With proper attention to electrode placement, linear-EIM has sufficient reproducibility to become an important clinical toot in neuromuscular disease evaluation. (C) 2004 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.