de Oliveira Aline Cabral, Pereira Liliane Desgualdo, Colafêmina José Fernando, de Lemos Menezes Pedro
Federal University of Sergipe , Brazil.
Acta Otolaryngol. 2014 Aug;134(8):796-801. doi: 10.3109/00016489.2014.909605. Epub 2014 Jun 9.
Responses with greater amplitude were recorded when carrier frequencies were modulated at 37, 40, and 43 Hz. These responses can be recorded even in patients with significant sensorineural hearing loss, from the sternocleidomastoid (SCM) muscle for a 500 Hz tone, 100% modulated at 40 Hz.
To determine the best carrier and modulating frequencies to evoke steady-state myogenic responses.
The present study investigated 156 ears of 78 normal-hearing young adults, with carrier frequencies of 250, 500, and 1000 Hz, modulated at 20, 37, 40, 43, 70, 77, and 80 Hz, with an intensity of 95 dBA. Furthermore, we observed responses evoked by stimulus carrier frequency of 500 Hz, modulated at 40 Hz, with an intensity of 95 dBA in a group of five subjects with severe sensorineural loss.
Responses were found for all stimuli studied (p < 0.01). Modulated stimuli at frequencies of 37, 40, and 43 Hz evoked better steady-state vestibular evoked myogenic potential (S-VEMP) (p < 0.05). No statistically significant differences were found between the group of normal hearers and the group of subjects with hearing loss (p = 0.431), for the stimulus used.
当载波频率在37、40和43赫兹进行调制时，记录到了幅度更大的反应。即使是患有严重感音神经性听力损失的患者，对于500赫兹音调、40赫兹100%调制的刺激，也能从胸锁乳突肌记录到这些反应。
确定诱发稳态肌源性反应的最佳载波频率和调制频率。
本研究对78名听力正常的年轻成年人的156只耳朵进行了调查，载波频率为250、500和1000赫兹，调制频率为20、37、40、43、70、77和80赫兹，强度为95分贝声压级。此外，我们在一组五名重度感音神经性听力损失的受试者中观察了500赫兹刺激载波频率、40赫兹调制、95分贝声压级强度所诱发的反应。
对所有研究的刺激均发现有反应（p < 0.01）。37、40和43赫兹频率的调制刺激诱发了更好的稳态前庭诱发肌源性电位（S-VEMP）（p < 0.05）。对于所使用的刺激，听力正常组和听力损失组之间未发现统计学上的显著差异（p = 0.431）。
