Occupational Hearing Loss
Get Occupational Hearing Loss essential facts below. View Videos or join the Occupational Hearing Loss discussion. Add Occupational Hearing Loss to your PopFlock.com topic list for future reference or share this resource on social media.
Occupational Hearing Loss
Prevalence of hearing Loss by Time Period and Industry Sector, 1981 - 2010, for 1,816,812 Workers
Prevalence of hearing Loss by Time Period and Industry Sector, 1981 - 2010, for 1,816,812 Workers[1]

Occupational hearing loss (OHL) is hearing loss that occurs as a result of occupational hazards, such as excessive noise and ototoxic chemicals. OHL is a prevalent occupational concern in various work environments worldwide.[2] In the United States, organizations such as the Occupational Safety and Health Administration (OSHA), the National Institute for Occupational Safety and Health (NIOSH) and the Mine Safety and Health Administration (MSHA) work with employers and workers to reduce or eliminate occupational hearing hazards through a hierarchy of hazard controls. OHL is one of the most common work-related illness in the United States.[3] Occupational hearing hazards include industrial noise, and exposure to various ototoxic chemicals.[4] Combined exposure to both industrial noise and ototoxic chemicals may cause more damage than either one would in isolation.[5] Many chemicals have not been tested for ototoxicity, so unknown threats may exist.

A 2016 study by NIOSH found that the mining sector had the highest prevalence of hearing impairment at 17%, followed by the construction sector (16%) and the manufacturing sector (14%). The public safety sector had the lowest rate of hearing impairment, at 7%.[6]

Personal protective equipment, administrative controls, and engineering controls can all work to reduce exposure to noise and chemicals, either by providing the worker with protection such as earplugs, or by reducing the noise or chemicals at the source or limiting the time or level of exposure.

Background

OHL is defined as any type of hearing loss, i.e. sensorineural, conductive, or mixed hearing loss, that occurs due to hazardous characteristics of a work environment.[7] The hearing loss can range in severity from mild to profound[7] and can be accompanied by tinnitus. Hazards of a work environment that can result in OHL include excessive noise, ototoxic chemicals, or physical trauma.[7] OHL caused by excessive exposure to noise is also known as noise-induced hearing loss (NIHL). Noise exposure combined with ototoxic chemical exposure can results in more damage to hearing. OHL caused by physical trauma may include foreign bodies in the ear, vibration, barotrauma, or head injury. OHL, as well as hearing loss in general, can cause negative secondary social and emotional effects that can impact quality of life.[8][9]

Within the United States of America, approximately 10 million people have NIHL. Over twice that number (~22 million) are occupationally exposed to dangerous noise levels.[10] Hearing loss accounted for a sizable percentage of occupational illness in 2007, at 14% of cases.[11] United States government agencies such as OSHA, NIOSH and MSHA are working to understand the causes of OHL and how it can be prevented while providing regulations and guidelines to help protect the hearing of workers in all occupations.[11]

Causes

Noise exposure

Exposure to noise can cause vibrations able to cause permanent damage to the ear. Both the volume of the noise and the duration of exposure can influence the likelihood of damage. Sound is measured in units called decibels, which is a logarithmic scale of sound levels that corresponds to the level of loudness that an individual's ear would perceive. Because it is a logarithmic scale, even small incremental increases in decibels correlate to large increases in loudness, and an increase in the risk of hearing loss.

Sounds above 80 dB have the potential to cause permanent hearing loss. The intensity of sound is considered too great and hazardous if someone must yell in order to be heard. Ringing in the ears upon leaving work is also indicative of noise that is at a dangerous level. Farming, machinery work, and construction are some of the many occupations that put workers at risk of hearing loss.

NIOSH establishes recommended exposure limits (RELs) to protect workers against the health effects of exposure to hazardous substances and agents encountered in the workplace. These NIOSH limits are based on the best available science and practices. NIOSH established the REL for occupational noise exposures to be 85 decibels, A-weighted (dB[A]) as an 8-hour time-weighted average.[12] Occupational noise exposure at or above this level are considered hazardous. The REL is based on exposures at work 5 days per week and assumes that the individual spends the other 16 hours in the day, as well as weekends, in quieter conditions. NIOSH also specifies a maximum allowable daily noise dose, expressed in percentages. For example, a person continuously exposed to 85 dB(A) over an 8-hour work shift will reach 100% of their daily noise dose. This dose limit uses a 3-dB time-intensity tradeoff commonly referred to as the exchange rate or equal-energy rule: for every 3-dB increase in noise level, the allowable exposure time is reduced by half. For example, if the exposure level increases to 88 dB(A), workers should only be exposed for four hours. Alternatively, for every 3-dB decrease in noise level, the allowable exposure time is doubled, as shown in the table below.

OSHA's current permissible exposure limit (PEL) for workers is an average of 90 dB over an 8-hour work day. Unlike NIOSH, OSHA uses a 5-dB exchange rate, where an increase in 5-dB for a sound corresponds to the amount of time workers may be exposed to that particular source of sound being halved. For example, workers cannot be exposed to a sound level of 95 dB for more than 4 hours per day, or to sounds at 100 dB for more than 2 hours per day. Employers who expose workers to 85 dB or more for 8 hour shifts are required to provide hearing exams and protection, monitor noise levels, and provide training.

Relationship between noise exposure levels and duration of allowable exposure at that level for NIOSH and OSHA
Relationship between noise exposure levels and duration of allowable exposure at that level for NIOSH and OSHA
NIOSH Sound Level Meter app using iPhone 7 and external microphone
The NIOSH Sound Level Meter app

Sound level meters and dosimeters are two types of devices that are used to measure sound levels in the workplace. Dosimeters are typically worn by the employee to measure their own personal sound exposure. Other sound level meters can be used to double check dosimeter measurements, or used when dosimeters cannot be worn by the employees. They can also be used to evaluate engineering controls aimed at reducing noise levels.

Some recent studies suggest that some smartphone applications may be able to measure noise as precisely as a Type 2 SLM.[13][14] Although most smartphone sound measurement apps are not accurate enough to be used for legally required measurements, the NIOSH Sound Level Meter app met the requirements of IEC 61672/ANSI S1.4 Sound Level Meter Standards (Electroacoustics - Sound Level Meters - Part 3: Periodic Tests).[15]

Ototoxic chemical exposure

Chemically-induced hearing loss (CIHL) is a potential result of occupational exposures. Certain chemical compounds may have ototoxic effects.[1] Exposure to organic solvents, heavy metals, and asphyxiants such as carbon monoxide can all cause hearing loss.[16][17] These chemicals can be inhaled, ingested, or absorbed through the skin. Damage can occur to either the inner ear or the auditory nerve. Certain medications may also have the potential to cause hearing loss.[18]

Both noise and chemical exposures are common in many industries, and can both contribute to hearing loss simultaneously.[19] Damage may be more likely or more severe if both are present, in particular if noise is impulsive.[20][21] Industries in which combinations of exposures may exist include construction, fiberglass, metal manufacturing, and many more.[18]

It is estimated that over 22 million workers are exposed to dangerous noise levels, and 10 million are exposed to solvents that could potentially cause hearing loss every year, with an unknown number exposed to other ototoxic chemicals.[17] A 2018 informational bulletin by the US Occupational Safety and Health Administration (OSHA) and the National Institute for Occupational Safety and Health (NIOSH) introduces the issue, provides examples of ototoxic chemicals, lists the industries and occupations at risk and provides prevention information.[2]

Prevention

OHL is preventable, but currently the interventions to prevent NIHL are complex. A 2017 Cochrane review[22] found that hearing loss prevention programs revealed that stricter legislation might reduce noise levels. Hearing protection devices, such as earmuffs and earplugs can reduce noise exposure to safe levels, but, instructions are needed on how to put plugs into the ears correctly to achieve potential attenuation. Giving workers information on their noise exposure levels by itself was not shown to decrease noise. Engineering solutions might lead to similar noise reduction as that provided by hearing protection. Better evaluation of the noise exposures resulting from engineering interventions is needed, as most of the available information is limited to observations in laboratory conditions. Overall, the effects of hearing loss prevention programs are unclear. Better use of hearing protection as part of a program but does not necessarily protect against hearing loss. The review concluded that in order to prevent NIHL in the workplace the quality of the implementation of prevention programs affects results, and that better quality of studies, especially in the field of engineering controls, and better implementation of legislation are needed. While the 2017 systematic review concluded there is a lack of conclusive evidence it highlighted that this should not be interpreted as evidence of lack of effectiveness. The implication is that future research could affect conclusions reached.[22]

Hierarchy of controls

NIOSH Hierarchy of Controls showing elimination as most effective, followed by substitution, engineering controls, administrative controls, and then as lease effective are personal protective equipment
NIOSH Hierarchy of Controls

The hierarchy of controls provides a visual guide to the effectiveness of the various workplace controls set in place to eliminate or reduce exposure to occupational hazards, including noise or ototoxic chemicals. The hierarchy includes the following from most effective to least effective:

Engineering controls

Engineering controls is the next highest in the hierarchy of risk reduction methods when elimination and substitution of the hazard are not possible. These types of controls typically involve making changes in equipment or other changes to minimize the level of noise that reaches a worker's ear. They may also involve measures such as barriers between the worker and the source of the noise, mufflers, regular maintenance of the machinery, or substituting quieter equipment.[25][26]

The OSHA Technical Manual (OTM) on noise provides technical information about workplace hazards and controls to OSHA's Compliance Safety and Health Officers (CSHOs).[27] The content of the OTM is based on currently available research publications, OSHA standards, and consensus standards. The OTM is available to the public for use by other health and safety professionals, employers, and anyone involved in developing or implementing an effective workplace safety and health program.

Examples of noise control strategies adopted in the workplace can be seen among the winners of the Safe-in-Sound Excellence in Hearing Loss Prevention Awards.

Administrative controls

Administrative control, behind engineering control, is the next best form of prevention of noise exposure.[25] They can either reduce the exposure to noise, or reduce the decibel level of the noise itself. Limiting the amount of time a worker is allowed to be around an unsafe level of noise exposure, and creating procedures for operation of equipment that could produce harmful levels of noise are both examples of administrative controls.[26]

Personal protection

Elimination or reduction of the source of noise or chemical exposure is ideal, but when that is not possible or adequate, wearing personal protective equipment (PPE) such as earplugs or earmuffs can help reduce the risk of hearing loss due to noise exposure. PPE should be a last resort and not be used in substitution for engineering or administrative controls. It is important that workers are properly trained on the use of PPE to ensure proper protection.[26] A personal attenuation rating can be objectively measured through a hearing protection fit-testing system.

Other initiatives

In addition to the hierarchy of controls, other programs have been created to promote the prevention of hearing loss in the workplace. For example, the Buy Quiet program was created to encourage the purchase of quieter tools and machinery in the workplace.[28] Additionally, the Safe-n-Sound Award was created to recognize organizations that excel in preventing occupational hearing loss.[29]

History

Occupational hearing loss is a very present industrial issue that has been noticed since the Industrial Revolution.[30] As industrial society continues to grow, this issue is becoming increasingly detrimental due to the exposure of chemicals and physical objects. Millions of employees have been affected by occupational hearing loss, especially in industry.[31] Industrialized countries see most of these damages as they result in both economic and living problems.

Within the United States of America alone, 10 of the 28 million people that have experienced hearing loss related to noise exposure. Rarely do workers express concerns or complaints regarding Occupational hearing loss. In order to gather relevant information, workers who have experienced loud work environments are questioned regarding their hearing abilities during everyday activities. When analyzing OHP, it is necessary to consider family history, hobbies, recreational activities, and how they could play a role in a person's hearing loss. In order to test hearing loss, audiometers are used to and are adjusted to American National Standards Institute (ANSI) regulations. The Occupation and Safety Health Association (OSHA) of the United States of America requires a program that conserves hearing when noise levels are greater than 85 dB. This program includes: 1."Monitoring to assess and record noise levels." 2. "Periodic audiometry." 3. "Noise Control" 4. "Education and record keeping."

References

  1. ^ Masterson EA, Deddens JA, Themann CL, Bertke S, Calvert GM (April 2015). "Trends in worker hearing loss by industry sector, 1981-2010". American Journal of Industrial Medicine. 58 (4): 392-401. doi:10.1002/ajim.22429. PMC 4557728. PMID 25690583.
  2. ^ Liu Y, Wang H, Weng S, Su W, Wang X, Guo Y, Yu D, Du L, Zhou T, Chen W, Shi T (2015-06-04). "Occupational Hearing Loss among Chinese Municipal Solid Waste Landfill Workers: A Cross-Sectional Study". PLOS ONE. 10 (6): e0128719. Bibcode:2015PLoSO..1028719L. doi:10.1371/journal.pone.0128719. PMC 4455999. PMID 26042421.
  3. ^ Themann C, Suter A, Stephenson M (2013). "National Research Agenda for the Prevention of Occupational Hearing Loss--Part 1". Seminars in Hearing. 34 (3): 145-207. doi:10.1055/s-0033-1349351.
  4. ^ Johnson AC, Morata TC (2010). "Occupational exposure to chemicals and hearing impairment. The Nordic Expert Group for Criteria Documentation of Health Risks from Chemicals" (PDF). Arbete och Hälsa. 44 (4): 177.
  5. ^ Sliwinska-Kowalska M, Zamyslowska-Szmytke E, Szymczak W, Kotylo P, Fiszer M, Wesolowski W, Pawlaczyk-Luszczynska M (May 2005). "Exacerbation of noise-induced hearing loss by co-exposure to workplace chemicals". Environmental Toxicology and Pharmacology. 19 (3): 547-53. doi:10.1016/j.etap.2004.12.018. PMID 21783525.
  6. ^ Masterson, Elizabeth A.; Bushnell, P. Timothy; Themann, Christa L.; Morata, Thais C. (2016). "Hearing Impairment Among Noise-Exposed Workers -- United States, 2003-2012 | MMWR". MMWR. Morbidity and Mortality Weekly Report. 65 (15): 389-394. doi:10.15585/mmwr.mm6515a2. PMID 27101435.
  7. ^ a b c Kim KS (December 2010). "Occupational hearing loss in Korea". Journal of Korean Medical Science. 25 (Suppl): S62-9. doi:10.3346/jkms.2010.25.s.s62. PMC 3023345. PMID 21258593.
  8. ^ Dalton DS, Cruickshanks KJ, Klein BE, Klein R, Wiley TL, Nondahl DM (October 2003). "The impact of hearing loss on quality of life in older adults". The Gerontologist. 43 (5): 661-8. doi:10.1093/geront/43.5.661. PMID 14570962.
  9. ^ Arlinger S (July 2003). "Negative consequences of uncorrected hearing loss--a review". International Journal of Audiology. 42 Suppl 2: 2S17-20. PMID 12918624.
  10. ^ NIOSH (Mar 22, 2018). "Noise and Hearing Loss Prevention". Retrieved 2018.
  11. ^ a b "CDC - Facts and Statistics: Noise - NIOSH Workplace Safety & Health". www.cdc.gov. Retrieved .
  12. ^ NIOSH (1998). "Criteria for a Recommended Standard - Occupational Noise Exposure" (PDF). Retrieved 2018.
  13. ^ Kardous CA, Shaw PB (April 2014). "Evaluation of smartphone sound measurement applications". The Journal of the Acoustical Society of America. 135 (4): EL186-92. Bibcode:2014ASAJ..135L.186K. doi:10.1121/1.4865269. PMC 4659422. PMID 25236152.
  14. ^ Kardous CA, Shaw PB (October 2016). "Evaluation of smartphone sound measurement applications (apps) using external microphones-A follow-up study". The Journal of the Acoustical Society of America. 140 (4): EL327-EL333. Bibcode:2016ASAJ..140L.327K. doi:10.1121/1.4964639. PMC 5102154. PMID 27794313.
  15. ^ Celestina M, Hrovat J, Kardous CA (October 2018). "Smartphone-based sound level measurement apps: Evaluation of compliance with international sound level meter standards". Applied Acoustics. 139: 119-128. doi:10.1016/j.apacoust.2018.04.011. ISSN 0003-682X.
  16. ^ EU-OSHA, European Agency for Safety and Health at Work (2009). "Combined exposure to noise and ototoxic substances". Combined exposure to noise and ototoxic substances. EU OSHA. Retrieved 2016.
  17. ^ a b "CDC - NIOSH Topic: Occupational Hearing Loss (OHL) Surveillance". www.cdc.gov. Retrieved .
  18. ^ a b "Ototoxic chemicals - chemicals that result in hearing loss". Department of Commerce Western Australia. 2014-01-08. Retrieved .
  19. ^ Campo P, Morata TC, Hong O (April 2013). "Chemical exposure and hearing loss". Disease-A-Month. 59 (4): 119-38. doi:10.1016/j.disamonth.2013.01.003. PMC 4693596. PMID 23507352.
  20. ^ Fuente A, Qiu W, Zhang M, Xie H, Kardous CA, Campo P, Morata TC (March 2018). "Use of the kurtosis statistic in an evaluation of the effects of noise and solvent exposures on the hearing thresholds of workers: An exploratory study" (PDF). The Journal of the Acoustical Society of America. 143 (3): 1704-1710. Bibcode:2018ASAJ..143.1704F. doi:10.1121/1.5028368. PMID 29604694.
  21. ^ Venet T, Campo P, Thomas A, Cour C, Rieger B, Cosnier F (2015). "The tonotopicity of styrene-induced hearing loss depends on the associated noise spectrum". Neurotoxicology and Teratology. 48: 56-63. doi:10.1016/j.ntt.2015.02.003. PMID 25689156.
  22. ^ a b Tikka C, Verbeek JH, Kateman E, Morata TC, Dreschler WA, Ferrite S (July 2017). "Interventions to prevent occupational noise-induced hearing loss". The Cochrane Database of Systematic Reviews. 7: CD006396. doi:10.1002/14651858.CD006396.pub4. PMC 6353150. PMID 28685503.
  23. ^ "Hierarchy of Controls". SA Unions. Retrieved 2016.
  24. ^ "Hierarchy of Controls". Centers for Disease Control and Prevention. Retrieved 2016.
  25. ^ a b "NIOSH - Engineering Noise Control - Workplace Safety and Health Topic". www.cdc.gov. Retrieved .
  26. ^ a b c "Noise controls (Engineering, Administrative, PPE) | Mining Safety & Health Resource Center". miningsh.arizona.edu. Retrieved .
  27. ^ OSHA (Aug 15, 2013). "OSHA Technical Manual - Noise". Retrieved 2018.
  28. ^ "Buy Quiet". Centers for Disease Control and Prevention. Retrieved 2016.
  29. ^ "Excellence in Hearing Loss Prevention Award". Safe-in-Sound. Retrieved 2016.
  30. ^ Sataloff RT, Sataloff J (1993). Occupational hearing loss (2nd ed.). New York: M. Dekker. ISBN 978-0-8247-8814-8.
  31. ^ Al-Otaibi ST (June 2000). "Occupational hearing loss". Saudi Medical Journal. 21 (6): 523-30. PMID 11500698.

  This article uses material from the Wikipedia page available here. It is released under the Creative Commons Attribution-Share-Alike License 3.0.

Occupational_hearing_loss
 



 



 
Music Scenes