正常青年人多频稳态听觉诱发电位阈值的测试

Test on auditory steady-state responses of normal-hearing adults

目的探讨用ASSR阈值预测听力正常耳听力状况和缩短ASSR测试时间的可行性。方法选取28名听力正常的青年人作为受试者(56耳),对其进行纯音听阈和ASSR阈值测试,记录500、1000、2000和4000Hz四个频率纯音阈值、ASSR阈值出现时的搜索时间和ASSR阈值,根据ASSR阈值均数推测纯音听阈均值,分析ASSR阈值与其纯音听阈的关系和最大搜索时间对ASSR阈值检出率的影响。结果 ASSR在500、1000、2000和4000Hz四个频率的反应阈值分别是29±8、29±8、28±9和30±10dBHL,各频率反应阈值无明显差异(P>0.05),各频率ASSR反应阈值与纯音听阈阈值之差在13～15dB之间,各频率ASSR反应阈值与纯音听阈阈值无明显相关性(P>0.05),PTA预测值和PTA实测值相差8dB,四个频率最大搜索时间为6和9min时ASSR阈值检出率无明显差异(P>0.05)。结论听力正常青年人ASSR反应阈值与纯音听阈阈值相差在15dB之内,但两者相关性较差,不宜直接用ASSR阈值预测听力正常人纯音听阈阈值;对于ICSChartrEP系统来说,将最大搜索时间设置为6min可以既不改变ASSR阈值的检出率又缩短ASSR的测试时间。

Aim To discuss the method of forecasting the normal-hearing adult＇s audio state through the thresholds of auditory steady-state response（ASSR）and the creditability of shortening the testing time of ASSR.Methods The pure tone audiometry and ASSR to multiple simultaneous stimuli were tested in a sample of 28 normal-hearing adults（56 ears）.The thresholds of pure tone and ASSR,and the searching time when ASSR thresholds appear in 500,1 000,2 000,4000 Hz were recored.Speculating the pure tone average（PTA）based the mean of ASSR thresholds.The relationship between ASSR thresholds and pure tone thresholds was analyzed and wheather the max researching time may influence the ASSR thresholds was studied.Results The ASSR thresholds at 500,1 000,2 000,4 000 Hz were 29±8、29±8、28±9 and 30±10 dBHL.The test showed no significant difference between frequencies（P〉0.05）.ASSR thresholds were about 13-15 dB higher than pure tone thresholds in four frequencies.There was no significant correlation between ASSR thresholds and pure tone thresholds.The predictive value of PTA was about 8 dBHL higher than substantive PTA.The max researching time in all frequencies showed no significant difference to the ASSR thresholds between 6min and 9min（χ^2=0.152,1.145,0.783,3.02,P〈0.05）.Conclusion The ASSR thresholds were no more than 15 dBHL higher than pure tone thresholds in normal-hearing adult.It was not suitable to predict the pure tone thresholds in normal-hearing adults through their ASSR thresholds.For ICS Chartr EP system,if we set the max research time for 6min,the ASSR thresholds＇ detection rate won＇t change and the testing time could be shortened.