参考电极位置对复合肌肉动作电位（CMAP）起始潜伏期的影响。

Effect of reference electrode position on the compound muscle action potential (CMAP) onset latency.

作者信息

Phongsamart Gulapar, Wertsch Jacqueline J, Ferdjallah Mohammed, King John C, Foster D Terrence

机构信息

Medical College of Wisconsin, Zablocki VA Medical Center, Department of Physical Medicine and Rehabilitation, 5000 W. National Avenue, Milwaukee, Wisconsin 53295, USA.

出版信息

Muscle Nerve. 2002 Jun;25(6):816-21. doi: 10.1002/mus.10119.

DOI:10.1002/mus.10119

PMID:12115969

Abstract

Compound muscle action potential (CMAP) onset latency is interpreted to reflect the arrival time at the muscle of impulses in the fastest-conducting motor nerve fiber. However, we have observed that the position of the reference or indifferent electrode (E2) affects CMAP onset latency. Motor nerve conduction studies (NCS) of the median, ulnar, and deep ulnar motor (DUM) nerves on 20 normal hands were performed using both traditional bipolar and experimental monopolar (referenced to the contralateral hand) montages. As the position of E2 was altered, the CMAP onset latency varied 0.1-0.5 ms for the median NCS, 0.1-0.3 ms for the ulnar NCS, and 0.1-1.5 ms for the DUM NCS. This study demonstrates that E2 recorded potentials are significant and vary with positioning, affecting motor onset latency. This has implications both for reference values and the physiologic interpretation of the CMAP waveform.

摘要

复合肌肉动作电位（CMAP）起始潜伏期被认为反映了最快传导的运动神经纤维中的冲动到达肌肉的时间。然而，我们观察到参考电极或无关电极（E2）的位置会影响CMAP起始潜伏期。使用传统双极和实验单极（参考对侧手）记录方式，对20只正常手的正中神经、尺神经和尺神经深支运动神经进行了运动神经传导研究（NCS）。随着E2位置的改变，正中神经NCS的CMAP起始潜伏期变化0.1 - 0.5毫秒，尺神经NCS为0.1 - 0.3毫秒，尺神经深支NCS为0.1 - 1.5毫秒。本研究表明，E2记录的电位具有显著性且随位置变化，影响运动起始潜伏期。这对参考值以及CMAP波形的生理学解释均有影响。