【摘要】 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。更多还原

【Abstract】 Objective:To observe how different viborator placement and different stimulate rates affect the results of bone conduction ABRs.Method:Bone conduction ABRs with different viboratory placement and different stimulate rates were recorded in 20 normal hearing young adults and compared with their air conduction ABRs. Result:The results show that all subjects were recorded reproducible and reliable air and bone conduction ABR waveforms under higher intensities(above 40 dBnHL).The ABR thresholds from air and bone conduction were similar,they are both about 5～10dB higher above their behavioral thresholds to clicks.The frontal placement produces significantly longer ABR wave Ⅴ latencies.Bone conduction ABR wave Ⅴ latencies from different stimulate rates were also observed.The results show that temporal placement ABR wave Ⅴ latencies became longer significantly when the stimulate rate increased from 20/s to 52/s.Conclusion:Although it is affected by different vibrorator placement and different stimulate rate,bone conduction ABR is a valuable and effective method to detect hearing ,it plays an important role in newborn auditory screening, assessment of conchlear reserve, and identification of hearing loss.更多还原