Application of auditory brainstem response on diagnose of hearing injury induced by noise

Objective To discuss the merit of application of auditory brainstem responses(ABR) on occupational noise induced hearing impairment diagnose.Methods The pure acoustic test and auditory brainstem responses test were respectively done on 108 patients with noise induced hearing impairment who were perennially exposed to noise(group one) and on as many as healthy ones(group two).Results In the pure acoustic test of auditory threshold on two groups,the difference of auditory threshold had significance in the all frequency threshold(in lower frequency threshold,P0.05,while in high frequency threshold,P0.01),nevertheless,auditory threshold descending in high threshold was dominant;threshold level in ABR test was coincident with the threshold in pure acoustic test in 172 of 216 ears(79.63%) of 108 patients(group one),the difference had significance comparing to the healthy ones(group two)(P0.01),high frequency threshold level in pure sound was higher than threshold in ABR in 28 ears(12.96%)(the difference was above 15 db),high frequency threshold level in pure sound was lower than threshold in ABR in 16 ears(7.41%);positive relativity was verified between high frequency threshold and threshold in pure sound(r=0.57,P0.01),while lower frequency threshod and threshold in pure sound were no relative.Conclusion Noise can cause hearing impairment,and the auditory brainstem responses in the patients with noise-induced hearing impairment is helpful for diagnose