TY - JOUR T1 - Effect of noise exposure on auditory system of industrial workers using pure tone audiometry (PTA), transient evoked otoacoustic emissions (TEOAEs) and distortion product otoacoustic emissions (DPOAEs) TT - تأثیر مواجهه با نویز بر سیستم شنوایی کارگران با استفاده از ادیومتری تون خالص (PTA)، گسیل‌های صوتی گذرای گوش (TEOAEs) و گسیل‌های صوتی محصول اعوجاج (DPOAE) JF - RJMS JO - RJMS VL - 20 IS - 112 UR - http://rjms.iums.ac.ir/article-1-2771-en.html Y1 - 2013 SP - 84 EP - 92 KW - Noise-induced hearing loss KW - Transient evoked otoacoustic emission KW - Distortion product otoacoustic emission KW - Pure tone audiometry KW - Noise pollution. N2 -  Background: Different studies have shown that Otoacoustic Emission (OAEs) is generated by Outer Hair Cells (OHCs) and these sensory cells are first structures exposed to damage of high level noise. Therefore minor impairment in OHCs can lead to lack of response of OAE. The purpose of the current study is to compare the pure tone thresholds, Transient Evoked Otoacoustic Emission (TEOAE) and Distortion Product Otoacoustic Emission (DPOAE) amplitude in industrial workers experiencing non-permissible noises and official staffs. Methods: This study was conducted as a case control paradigm. The cases included 134 workers exposed to non-permissible noise and control group that constituted 89 official staff. The threshold of pure tone, TEOAE and DPOAE amplitudes were recorded and compared among the subjects. Results: Pure tone thresholds at frequencies of 1- 4 KHz among industrial workers were higher (worse) than the control group and these differences were significant within frequencies of 3 and 4 KHz (p< 0.01). TEOAE amplitudes within 4 frequencies (1-4 KHz) indicated significant decrease among workers group in comparison with control group (p M3 ER -