Mehrparvar Amir H, Mirmohammadi Seyyed J, Ghoreyshi Abbas, Mollasadeghi Abolfazl, Loukzadeh Ziba
Department of Occupational Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
Noise Health. 2011 Nov-Dec;13(55):402-6. doi: 10.4103/1463-1741.90295.
Noise-induced hearing loss (NIHL), an irreversible disorder, is a common problem in industrial settings. Early diagnosis of NIHL can help prevent the progression of hearing loss, especially in speech frequencies. For early diagnosis of NIHL, audiometry is performed routinely in conventional frequencies. We designed this study to compare the effect of noise on high-frequency audiometry (HFA) and conventional audiometry. In a historical cohort study, we compared hearing threshold and prevalence of hearing loss in conventional and high frequencies of audiometry among textile workers divided into two groups: With and without exposure to noise more than 85 dB. The highest hearing threshold was observed at 4000 Hz, 6000 Hz and 16000 Hz in conventional right ear audiometry, conventional left ear audiometry and HFA in each ear, respectively. The hearing threshold was significantly higher at 16000 Hz compared to 4000. Hearing loss was more common in HFA than conventional audiometry. HFA is more sensitive to detect NIHL than conventional audiometry. It can be useful for early diagnosis of hearing sensitivity to noise, and thus preventing hearing loss in lower frequencies especially speech frequencies.
噪声性听力损失（NIHL）是一种不可逆的病症，在工业环境中是一个常见问题。NIHL的早期诊断有助于预防听力损失的进展，尤其是在言语频率方面。为了早期诊断NIHL，常规频率的听力测定会被定期进行。我们设计了这项研究来比较噪声对高频听力测定（HFA）和常规听力测定的影响。在一项历史性队列研究中，我们比较了分为两组的纺织工人在常规听力测定和高频听力测定中的听力阈值以及听力损失患病率：一组暴露于85分贝以上的噪声，另一组未暴露。在常规右耳听力测定、常规左耳听力测定以及每只耳朵的HFA中，最高听力阈值分别在4000赫兹、6000赫兹和16000赫兹处观察到。与4000赫兹相比，16000赫兹处的听力阈值显著更高。听力损失在HFA中比在常规听力测定中更常见。与常规听力测定相比，HFA在检测NIHL方面更敏感。它对于早期诊断对噪声的听力敏感性可能有用，从而预防低频尤其是言语频率的听力损失。
