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目的探讨骨导听觉脑干电反应 (auditorybrainstemresponse ,ABR)测试中对侧耳适宜的掩蔽强度。方法对 1 6位正常受试者进行骨导ABR检测及观察刺激侧和对侧白噪声掩蔽对其波形的影响 ,并对一耳听力正常、另一耳重度感音神经性聋的 5位患者进行验证。 结果正常人当同侧或对侧耳加以白噪声掩蔽时 ,骨导ABR波形和V波潜伏期与未加掩蔽时不同。在单侧感音神经性聋患者 ,患侧给予 6 0dB骨导刺激诱发的骨导ABR可被对侧40dB的掩蔽白噪声所消除。 结论一侧骨导声刺激可使双侧耳蜗兴奋产生双侧ABR ,因此检测时必须在对侧耳加以气导掩蔽声 ,如用白噪声掩蔽时 ,掩蔽声的强度以比骨导刺激声低 2 0dB为宜
Objective To explore the suitable masking intensity of lateral ear in the test of auditory brainstem response (ABR). Methods Sixteen normal subjects were subjected to bone conduction test (ABR), and the effects of stimulus-side and contralateral white noise masking on the waveform were observed. Five patients with one ear hearing loss and one hearing loss hearing loss authenticating. Results When the normal or contralateral ears were concealed by white noise, the ABR waveforms and V-wave latency of osteoporosis were different from those without masking. In patients with unilateral sensorineural hearing loss, ipsilateral bone conduction ABR induced by 60 dB bone conduction stimulation can be canceled by 40 dB masked white noise on the contralateral side. CONCLUSIONS: Bilateral acoustic stimulation can induce bilateral bilateral cochlear excitability to produce bilateral ABR. Therefore, it is necessary to conduct airway masking on the contralateral ear during masking. For example, when masking with white noise, the intensity of masking sound is lower than that of osteoporosis 0dB is appropriate