Characteristics of tone burst-evoked myogenic potentials in the sternocleidomastoid muscles
Characteristics of tone burst-evoked myogenic potentials in the sternocleidomastoid muscles
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DOI：
10.1097/00129492-200111000-00014
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发表时间：
2001-11-01
影响因子：
2.1
通讯作者：
Colebatch, JG
中科院分区：
文献类型：
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作者：
Welgampola, MS;Colebatch, JG
假设：可以定义短纯音诱发肌源性反应的最佳刺激参数。这些优化的反应将是类似于那些诱发的点击在相同的subjects.Background：响亮的音调引起的肌源性反应，在前颈部肌肉，类似点击诱发电位，并可能是saccular在origin.Methods：音爆发诱发和点击诱发的肌源性电位测定从12名正常人（6男，6女）的胸锁乳突肌强直激活。系统地研究了短纯音频率和持续时间的影响。测量了相同受试者的点击阈值，并将其与点击阈值进行了比较。特定病变的患者进行了研究，使用这两种stimulation.Results：短纯音诱发反应显示频率调谐，最大的反射幅度在500 Hz或1 kHz。随着刺激持续时间的增加，使用恒定的重复率，反射幅度增加，然后下降。整体最佳刺激持续时间为7毫秒。平均短纯音听阈为114.4dB声压级。短声诱发反应和短纯音诱发反应的刺激阈值显著相关。在刺激患有深度感音神经性听力损失的受试者的受影响耳朵后，存在短纯音诱发和点击诱发的反应。四名受试者谁以前经历了前庭神经切除术在没有点击和短纯音诱发反应油侧或病变，确认其vestibulardependency.Conclusion：短纯音诱发的肌源性反应是类似的点击诱发反应，但需要较低的绝对刺激强度。为了确定最佳反应，应使用7毫秒的刺激持续时间、足够的强度以及500 Hz和1 kHz的频率。
Hypothesis: Optimum stimulus parameters for tone burst-evoked myogenic responses can be defined. These optimized responses will be similar to those evoked by clicks in the same subjects.Background: Loud tones give rise to myogenic responses in the anterior neck muscles, similar to click-evoked potentials, and are likely to be saccular in origin.Methods: Tone burst-evoked and click-evoked myogenic potentials were measured from the sternocleidomastoid muscles of 12 normal subjects (6 men, 6 women) during tonic activation. The effects of tone burst frequency and duration were systematically investigated. Thresholds were measured and compared with click thresholds for the same subjects. Patients with specific lesions were studied using both stimuli.Results: Tone burst-evoked responses showed frequency tuning, with the largest reflex amplitudes at either 500 Hz or 1 kHz. As the stimulus duration was increased, using a constant repetition rate, there was an increase in the reflex amplitudes followed by a decline. The overall optimum stimulus duration was 7 milliseconds. The mean tone burst threshold was 114.4 dB sound pressure level. Stimulus thresholds for click-evoked and tone burst-evoked responses were significantly correlated. Tone burst-evoked and click-evoked responses were present after stimulation of the affected ears of subjects with profound sensorineural hearing loss. Four subjects who had previously undergone vestibular neurectomy had in absence of click and tone burst-evoked responses oil the side or the lesion, confirming their vestibular dependence.Conclusion: Tone burst-evoked myogenic responses are similar to click-evoked responses but require lower absolute stimulus intensities. To be certain of an optimum response, a stimulus duration of 7 milliseconds, an adequate intensity, and frequencies of both 500 Hz and 1 kHz should be used.