Speech and Hearing Therapy Program - FMUSP, Brazil.
Braz J Otorhinolaryngol. 2009 Jul-Aug;75(4):579-85. doi: 10.1016/s1808-8694(15)30499-7.
The Middle Latency Auditory Evoked Response may be influenced by the post-auricular muscle reflex which occurs at the same latency of this potential.
to evaluate the muscle reflex influence on the middle latency response, identifying the most appropriate place for response recording.
Prospective study in which 40 normal hearing individuals, ranging in age from 18 to 40 years old, were assessed by Middle Latency Response with electrodes placed first on the mastoids, and then on the earlobes.
significant statistical differences were seen between the values found with electrodes placed on the mastoids and on the earlobes concerning the Na-Pa amplitude in C3/A1, C3/A2 and C4/A2, concerning the Na wave latency in C3/A2 and C4/A2, and concerning the Pa wave latency in C3/A1 and C3/A2. We found a higher occurrence of the post-auricular reflex when the electrode was placed on the mastoids, in all studied modalities.
there was post-auricular muscle reflex interference upon the Middle Latency Response obtained when the electrodes were placed on the mastoid, and the most efficient electrode disposition in order to capture and to register more accurately this potential was on the earlobe.
中潜伏期听觉诱发电位可能受到耳后肌反射的影响，而这种反射在该电位的相同潜伏期发生。
评估肌肉反射对中潜伏期反应的影响，确定记录反应的最佳位置。
前瞻性研究共纳入 40 名听力正常的个体，年龄在 18 至 40 岁之间，通过中潜伏期反应进行评估，电极首先置于乳突上，然后置于耳垂上。
在 C3/A1、C3/A2 和 C4/A2 中的 Na-Pa 振幅、C3/A2 和 C4/A2 中的 Na 波潜伏期以及 C3/A1 和 C3/A2 中的 Pa 波潜伏期方面，耳垂电极与乳突电极的测量值存在显著的统计学差异。在所有研究模式中，当电极置于乳突上时，都能发现更高的耳后反射发生率。
当电极置于乳突上时，中潜伏期反应会受到耳后肌反射的干扰，而耳垂是捕获和更准确记录该电位的最有效电极位置。
