Auditory brain stem response in noise induced permanent hearing loss

ABSTRACT

The objectives of the study are 1- To prove the existence of the cochlear affection in noise induced hearing loss by means of ABR. 2- To study the effect of noise exposure on speech discrimination ability. 3- To study the latency intensity function curve in the noise induced sensory-neural hearing loss as compared to a normal subject. 4- To study the effect of the period of noise exposure on the hearing threshold level. This study included twenty male individuals, chosen from textile factories, age ranged between 25 and 45 years, duration of exposure to noise is from 5 up to 30 years. In addition, 10 normal subjects were included as a control group. Both the study and control groups were submitted to full history, full ear, nose and throat examination and audiological examination [pure tone and speech audiometry-emittancemetry and evoked response audiometry]. The results were given in details