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目的 :观察不同位置放置骨振荡器 ,不同的刺激速率等对骨导听性脑干反应的影响。方法 :对 2 0例听力正常青年人以不同的骨振荡器放置位置、不同的刺激速率行骨导ABR测试 ,并与气导ABR进行对比。结果 :2 0例受试者在较高强度刺激下 (4 0dBnHL以上 )均可记录到清晰、稳定的骨导ABR各波 ,且气、骨导ABR反应阈相似 ,均在其主观阈上 5～ 10dB ;前额和乳突放置骨振荡器相比较 ,其ABR波Ⅴ潜伏期差异有显著性 ;气导和乳突骨导ABR波V潜伏期差异不显著 ;骨导短声刺激速率从 2 0次 /s增到 5 2次 /s时 ,ABR波Ⅴ潜伏期明显延长。结论 :骨导ABR测试受骨振荡器的位置、刺激速率等的影响 ;但其仍不失为一可行而有效的听力检测手段 ,对婴幼儿听力筛选、耳蜗残余功能的判定及各种听力损失的鉴别诊断有着重要作用。
OBJECTIVE: To observe the effects of bone oscillator placed at different positions and different stimulation rates on the auditory brainstem response of bone conduction. Methods: 20 cases of normal hearing young people with different bone oscillator placement, different stimulation rate of bone conduction ABR test, and air conduction ABR were compared. Results: Clear and stable bone conduction ABR waves were recorded in 20 subjects under higher intensity stimulation (above 40 dBnHL), and the ABR thresholds of gas and bone conduction were similar, both of which were above the subjective threshold 5 ~ 10dB. There was significant difference in latency of ABR wave V between the forehead and mastoid bone oscillator. There was no significant difference in latent period of ABR wave between air conduction and papillae. The rate of bone conduction shortening was 20 times / s increased to 5 2 times / s, ABR wave Ⅴ latency was significantly prolonged. Conclusions: The bone conduction ABR test is influenced by the position and stimulation rate of bone oscillator. However, it is still a feasible and effective means of hearing test. It can be used to identify hearing loss and cochlear residual function of infants and young children and identify various hearing loss Diagnosis has an important role.