Understanding and preventing noise-induced hearing loss.
Noise is a major occupational and environmental hazard, causing hearing loss, annoyance, sleep disturbance, fatigue, and hypertension. Although the extra-auditory effects of high-level noise exposure have been reported, noise-induced hearing loss (NIHL) has long been recognized as the primary and most direct health effect of excessive noise exposure. The World Health Organization reported that 16% of the disabling hearing loss in adults is attributable to occupational noise exposure. NIHL has been recognized as an occupational disease and injury since the 18th century among copper workers who suffered hearing loss as a result of hammering on metal. In the 1800s, Fosbroke also mentioned how blacksmiths suffered hearing impairment from continued exposure to noise. The occupational risk of NIHL in industries that expose workers to continuous high levels of noise is well established with more than 30 million U.S. civilian workers estimated to be exposed to potentially damaging noise levels and another 9 million at risk from other ototraumatic agents, including chemicals. In 1996, the NIOSH had established the National Occupational Research Agenda (NORA) that identified NIHL as one of the 21 priority areas to stimulate innovative research and improved workplace practices to reduce NIHL problem. In order to manage this major health problem among workers exposed to occupational noise, it is important to understand the nature of NIHL. Two characteristics of NIHL have been thoroughly established through numerous studies. First, the amount of hearing loss increases with noise intensity and duration of exposure, such that more intense and longer-duration noise exposures cause more severe hearing loss. Second, individual susceptibility to NIHL varies greatly. Not all individuals exposed to a given noise level develop the same degree of hearing loss. Although the reason that some individuals are more susceptible to NIHL than others is not well understood, several factors have been implicated, including age, previous sensorineural hearing loss, cigarette smoking, use of ototoxic medication, type 2 diabetes, and hypertension. The relationship between these factors and NIHL works in reverse as well. For example, a recent animal study by Kujawa and Liberman demonstrated that damage caused by noise exposure early in life made mice more susceptible to age-related hearing loss.
Preconditioning by the inhalation of pure oxygen protects rat’s cochlear function against noise-induced hearing loss
Background: Occupational noise-induced hearing loss (ONIHL) is a hearing disorder that affects workers all over the world. Preconditioning with several mild or less potent stressors will effectively prevent the development of noise-induced hearing loss. This study investigated the possible preventive effects of normobaric hyperoxia preconditioning on preventing the noise-induced hearing impairm...متن کامل
Objective(s): Noise-induced hearing loss (NIHL) is the major cause of acquired hearing loss. Celecoxib, a cyclooxygenase-2 (COX-2) inhibitor, is a non- steroidal anti- inflammatory drug (NSAID) with known antioxidant and antineoplastic activity. Therefore, we monitored the extent of temporary noise- induced threshold shifts (TTS) and cochlear damage caused by high level 4- kHz noise exposure t...متن کامل
Introduction: It has been shown that low levels of pigmentation increase susceptibility to noise-induced hearing loss in humans. For this reason, white populations develop more pronounced noise- induced hearing loss in comparison to black populations. Similarly, blue-eyed individuals exhibit greater temporary threshold shift than brown-eyed subjects; still, no strong correlation has been veri...متن کامل
Introduction: Nowadays, noise exposure is one of the most important industrial health problems. Noise exposure can cause hearing loss and many other health problems. So, paying attention to the noise exposure problem should be of main priority in industrial health programs. This study was conducted in an oil producing region, aimed to assess noise pollution and noise induced hearing loss. Met...متن کامل
Introduction: Exposure to hazardous noise induces one of the forms of acquired and preventable hearing loss that is noise-induced hearing loss (NIHL). Considering oxidative stress as the main mechanism of NIHL, it is possible that myricetin can protect NIHL by its antioxidant effect. Therefore, the present study aimed to investigate the preventive effect of myricetin on NIHL. <br /...متن کامل
Background and Objective: There are many chemical, physical and biological hazards which are threatening the dentists' health. In this study we assessed the effect of noise on Zanjan dentists hearing loss as one of the dentistry physical hazards. Materials and Methods: This cross sectional study was performed on all zanjan dentists in 2006-7. All dentists were examined by audiometer (CA76 and A...متن کامل