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Roggia SM, Zucki F, Fuente A, Lacerda ABMD, Gong W, Carlson K, Morata TC. Audiological Tests Used in the Evaluation of the Effects of Solvents on the Human Auditory System: A Mixed Methods Review. Semin Hear 2023; 44:437-469. [PMID: 37818148 PMCID: PMC10562058 DOI: 10.1055/s-0043-1769585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/12/2023] Open
Abstract
This study aimed to scope the literature, identify knowledge gaps, appraise results, and synthesize the evidence on the audiological evaluation of workers exposed to solvents. We searched Medline, PubMed, Embase, CINAHL, and NIOSHTIC-2 up to March 22, 2021. Using Covidence, two authors independently assessed study eligibility, risk of bias, and extracted data. National Institute of Health Quality Assessment Tools was used in the quality evaluation of included studies; the Downs and Black checklist was used to assess the risk of bias. Of 454 located references, 37 were included. Twenty-five tests were studied: two tests to measure hearing thresholds, one test to measure word recognition in quiet, six electroacoustic procedures, four electrophysiological tests, and twelve behavioral tests to assess auditory processing skills. Two studies used the Amsterdam Inventory for Auditory Disability and Handicap. The quality of individual studies was mostly considered moderate, but the overall quality of evidence was considered low. The discrepancies between studies and differences in the methodologies/outcomes prevent recommending a specific test battery to assess the auditory effects of occupational solvents. Decisions on audiological tests for patients with a history of solvent exposures require the integration of the most current research evidence with clinical expertise and stakeholder perspectives.
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Affiliation(s)
- Simone Mariotti Roggia
- Department of Audiology and Speech Therapy, Federal University of Santa Catarina, Florianopolis, Brazil
| | - Fernanda Zucki
- Department of Audiology and Speech Therapy, Federal University of Santa Catarina, Florianopolis, Brazil
| | - Adrian Fuente
- École d'Orthophonie et d'Audiologie, Faculté de Médecine, Université de Montréal, Centre de Recherche de l'Institut Universitaire de Gériatrie de Montréal, Montreal, Canada
| | - Adriana Bender Moreira de Lacerda
- École d'Orthophonie et d'Audiologie, Faculté de Médecine, Université de Montréal, Centre de Recherche de l'Institut Universitaire de Gériatrie de Montréal, Montreal, Canada
| | - Wei Gong
- Division of Field Studies and Engineering, National Institute for Occupational Safety and Health, Cincinnati, Ohio
| | - Krystin Carlson
- Division of Science Integration, National Institute for Occupational Safety and Health, Cincinnati, Ohio
| | - Thais C. Morata
- Division of Field Studies and Engineering, National Institute for Occupational Safety and Health, Cincinnati, Ohio
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Olagbemi DOO, Asoegwu CN, Somefun AO, Nwawolo CC. Otologic symptoms and hearing thresholds among a cohort of call center operators in Lagos. THE EGYPTIAN JOURNAL OF OTOLARYNGOLOGY 2022. [DOI: 10.1186/s43163-022-00321-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Abstract
Background
The call center operation jobs are becoming a global phenomenon. The use of headphones for 7 to 9 h daily with varying noise level exposure is quite common among call center operators. This can cause structural and/or functional changes in the auditory system. Researchers have arrived at different conclusions regarding the risks associated with prolonged headphone usage. This study aimed to evaluate the risk of hearing changes and the range of otologic symptoms among call center operators in Lagos State, Nigeria.
Methods
This is a prospective cross-sectional study carried out on 90 call center operators (customer service staff) and 90 administrative staff (controls) aged 18 to 40 years working in two call centers affiliated to different private establishments in Lagos State. Their biographic data, work information, and otologic/non-otologic symptoms developed with the commencement of the job were obtained with a self-administered structured questionnaire. After otoscopic examination, diagnostic pure tone audiometry (PTA) was carried out before and after the work shift.
Results
The most commonly reported symptoms among the call center operators were headache, tinnitus, and vertigo. Symptoms were noted as early as 3 months into the job in 20 (24.7%) call center operators. The pre-shift and post-shift mean PTA of the call center operators were normal bilaterally and comparable to the controls. There was an elevation of low frequency (500 Hz) mean PTA of > 30 dB in both the call center operators and the controls. The mean PTA average for the call center operators’ pre-shift and post-shift were 25.4 ± 8.2 and 25.6 ± 8.1 in the right ear, 24.8 ± 8.5 and 24.7 ± 8.9 in the left ear, 25.9 ± 7.8 and 24.7 ± 7.8 right and left ears for the control. There were no statistically significant differences between the call center operators’ pre-shift and the controls’ hearing thresholds, and the pre-shift and post-shift hearing thresholds of the call center operators at all frequencies and in both ears.
Conclusion
Otologic and non-otologic symptoms arise from prolonged headphones usage among call center operators. No hearing damage or headphone noise-induced hearing loss was recorded in the call center operators in this study.
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Fuentes-Santamaría V, Alvarado JC, Mellado S, Melgar-Rojas P, Gabaldón-Ull MC, Cabanes-Sanchis JJ, Juiz JM. Age-Related Inflammation and Oxidative Stress in the Cochlea Are Exacerbated by Long-Term, Short-Duration Noise Stimulation. Front Aging Neurosci 2022; 14:853320. [PMID: 35450058 PMCID: PMC9016828 DOI: 10.3389/fnagi.2022.853320] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 03/14/2022] [Indexed: 12/29/2022] Open
Abstract
We have previously reported that young adult rats exposed to daily, short-duration noise for extended time periods, develop accelerated presbycusis starting at 6 months of age. Auditory aging is associated with progressive hearing loss, cell deterioration, dysregulation of the antioxidant defense system, and chronic inflammation, among others. To further characterize cellular and molecular mechanisms at the crossroads between noise and age-related hearing loss (ARHL), 3-month-old rats were exposed to a noise-accelerated presbycusis (NAP) protocol and tested at 6 and 16 months of age, using auditory brainstem responses, Real-Time Reverse Transcription-Quantitative PCR (RT-qPCR) and immunocytochemistry. Chronic noise-exposure leading to permanent auditory threshold shifts in 6-month-old rats, resulted in impaired sodium/potassium activity, degenerative changes in the lateral wall and spiral ganglion, increased lipid peroxidation, and sustained cochlear inflammation with advancing age. Additionally, at 6 months, noise-exposed rats showed significant increases in the gene expression of antioxidant enzymes (superoxide dismutase 1/2, glutathione peroxidase 1, and catalase) and inflammation-associated molecules [ionized calcium binding adaptor molecule 1, interleukin-1 beta (IL-1β), and tumor necrosis factor-alpha]. The levels of IL-1β were upregulated in the spiral ganglion and spiral ligament, particularly in type IV fibrocytes; these cells showed decreased levels of connective tissue growth factor and increased levels of 4-hydroxynonenal. These data provide functional, structural and molecular evidence that age-noise interaction contributes to exacerbating presbycusis in young rats by leading to progressive dysfunction and early degeneration of cochlear cells and structures. These findings contribute to a better understanding of NAP etiopathogenesis, which is essential as it affects the life quality of young adults worldwide.
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Affiliation(s)
- Verónica Fuentes-Santamaría
- Instituto de Investigación en Discapacidades Neurológicas (IDINE), Albacete, Spain
- Facultad de Medicina, Universidad de Castilla-La Mancha, Albacete, Spain
| | - Juan Carlos Alvarado
- Instituto de Investigación en Discapacidades Neurológicas (IDINE), Albacete, Spain
- Facultad de Medicina, Universidad de Castilla-La Mancha, Albacete, Spain
| | - Susana Mellado
- Instituto de Investigación en Discapacidades Neurológicas (IDINE), Albacete, Spain
- Facultad de Medicina, Universidad de Castilla-La Mancha, Albacete, Spain
| | - Pedro Melgar-Rojas
- Instituto de Investigación en Discapacidades Neurológicas (IDINE), Albacete, Spain
- Facultad de Medicina, Universidad de Castilla-La Mancha, Albacete, Spain
| | - María Cruz Gabaldón-Ull
- Instituto de Investigación en Discapacidades Neurológicas (IDINE), Albacete, Spain
- Facultad de Medicina, Universidad de Castilla-La Mancha, Albacete, Spain
| | - José J. Cabanes-Sanchis
- Instituto de Investigación en Discapacidades Neurológicas (IDINE), Albacete, Spain
- Facultad de Medicina, Universidad de Castilla-La Mancha, Albacete, Spain
| | - José M. Juiz
- Instituto de Investigación en Discapacidades Neurológicas (IDINE), Albacete, Spain
- Facultad de Medicina, Universidad de Castilla-La Mancha, Albacete, Spain
- Department of Otolaryngology, Hannover Medical School, NIFE-VIANNA, Cluster of Excellence Hearing4all-German Research Foundation, Hanover, Germany
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Morata TC, Hungerford M, Konrad-Martin D. Potential Risks to Hearing Functions of Service Members From Exposure to Jet Fuels. Am J Audiol 2021; 30:922-927. [PMID: 34407375 DOI: 10.1044/2021_aja-20-00226] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Purpose Several military occupations, particularly those within the U.S. Air Force, require working with or around jet fuels. Jet fuels contain components that are known to affect central nervous function, yet effects of these fuels on auditory function, specifically auditory processing of sound, are not well understood at this time. Animal studies have demonstrated that exposure to jet fuels prior to noise exposure can exacerbate the noise exposure's effects, and service members exposed to jet fuels are at risk of noise exposure within their work environments. The purpose of this article was to give a brief synopsis of the evidence on the ototoxic effects due to jet fuel exposure to aid audiologists in their decision making when providing care for populations who are occupationally exposed to fuels or while during military service. Conclusions Exposure to jet fuels impacts central nervous function and, in combination with noise exposure, may have detrimental auditory effects that research has yet to fully explain. Additional longitudinal research is needed to explain the relationships, which have clinical implications for service members and others exposed to jet fuels. In the meantime, audiologists can gain useful information by screening for chemical exposures when obtaining patient case histories. If jet fuel exposure is suspected, the Lifetime Exposure to Noise and Solvents Questionnaire can be used to estimate a noise exposure ranking and identify other potentiating agents such as jet fuel and industrial chemicals. A history of jet fuel exposure should inform the selection of hearing tests in the audiometric evaluation and when devising the treatment plan.
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Affiliation(s)
- Thais C. Morata
- National Institute for Occupational Safety and Health, Cincinnati, OH
| | - Michelle Hungerford
- National Center for Rehabilitative Auditory Research, VA Portland Health Care System, OR
| | - Dawn Konrad-Martin
- National Center for Rehabilitative Auditory Research, VA Portland Health Care System, OR
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Chen KH, Su SB, Chen KT. An overview of occupational noise-induced hearing loss among workers: epidemiology, pathogenesis, and preventive measures. Environ Health Prev Med 2020; 25:65. [PMID: 33129267 PMCID: PMC7603754 DOI: 10.1186/s12199-020-00906-0] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Accepted: 10/25/2020] [Indexed: 12/20/2022] Open
Abstract
Occupational noise-induced hearing loss (ONIHL) is the most prevalent occupational disease in the world. The goal of this study was to review the epidemiology, pathogenesis, and preventive measures of ONIHL among workers and provide evidence for the implementation of control measures. Literature studies were identified from the MEDLINE, PubMed, Embase, Web of Science, and Google Scholar using the search terms “noise-induced hearing loss” “prevalence”, “pathogenesis”, and “preventive measures”. The articles reviewed in this report were limited from 2000 to 2020. Articles that were not published in the English language, manuscripts without an abstract, and opinion articles were excluded. After a preliminary screening, all of the articles were reviewed and synthesized to provide an overview of the current status of ONIHL among workers. The mechanism of ONIHL among workers is a complex interaction between environmental and host factors (both genetic and acquired factors). The outcomes of noise exposure are different among individual subjects. Clinical trials are currently underway to evaluate the treatment effect of antioxidants on ONIHL. Noise exposure may contribute to temporary or permanent threshold shifts; however, even temporary threshold shifts may predispose an individual to eventual permanent hearing loss. Noise prevention programs are an important preventive measure in reducing the morbidity of ONIHL among workers.
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Affiliation(s)
- Kou-Huang Chen
- School of Mechanical and Electronic Engineering, Sanming University, Sanming, 365, Fujian Province, China
| | - Shih-Bin Su
- Department of Occupational Medicine, Chi-Mei Medical Center, Tainan, 710, Taiwan
| | - Kow-Tong Chen
- Department of Occupational Medicine, Tainan Municipal Hospital (managed by Show Chwan Medical Care Corporation), No. 670, Chongde Road, East District, Tainan, 701, Taiwan. .,Department of Public Health, College of Medicine, National Cheng Kung University, Tainan, 701, Taiwan.
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6
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Grobler LM, Swanepoel DW, Strauss S, Becker P, Eloff Z. Occupational noise and age: A longitudinal study of hearing sensitivity as a function of noise exposure and age in South African gold mine workers. SOUTH AFRICAN JOURNAL OF COMMUNICATION DISORDERS 2020; 67:e1-e7. [PMID: 32242440 PMCID: PMC7136817 DOI: 10.4102/sajcd.v67i2.687] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Revised: 01/12/2020] [Accepted: 01/21/2020] [Indexed: 12/20/2022] Open
Abstract
Background A relationship exists between occupational noise exposure and age, which remains poorly understood. Objectives The aim of this study was to establish the relationship between hearing loss and age over time. Method Audiological data from 2583 mine workers in South Africa were utilised. Data were received from a non-noise exposed group (NNEG) (n = 951) and a noise exposed group (NEG) (≥85 dBA) (n = 1632). Data comprised a low-frequency average (LFA512) (average of audiological thresholds for 0.5 kHz, 1 kHz and 2 kHz) and high-frequency average (HFA346) (average of audiological thresholds for 3 kHz, 4 kHz and 6 kHz). Data were compared by using mixed-effects regression analysis. Results Base threshold values were higher for the NEG than for the NNEG across frequencies. All year-to-year increases in mean hearing thresholds were statistically significant (p < 0.01). When correcting for age, increases in mean hearing thresholds were higher for the NEG than for the NNEG for HFA346 (3.5 dB vs. 2.9 dB decline over a 4-year period) but similar for LFA512 (0.6 dB vs. 0.7 dB decline). Uncorrected for age, increases in mean hearing thresholds were higher than when age was corrected for. Conclusion Age and occupational noise exposure influence hearing thresholds over time. The continued increase in hearing thresholds of the NEG above that of the NNEG can be related to ineffective noise management programmes and/or the fact that early noise exposure leads to a higher burden of hearing loss over time – even after noise exposure had stopped.
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Affiliation(s)
- Leoni M Grobler
- Department of Speech-Language Pathology and Audiology, Faculty of Humanities, University of Pretoria, Pretoria.
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7
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Banton MI, Bus JS, Collins JJ, Delzell E, Gelbke HP, Kester JE, Moore MM, Waites R, Sarang SS. Evaluation of potential health effects associated with occupational and environmental exposure to styrene - an update. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART B, CRITICAL REVIEWS 2019; 22:1-130. [PMID: 31284836 DOI: 10.1080/10937404.2019.1633718] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The potential chronic health risks of occupational and environmental exposure to styrene were evaluated to update health hazard and exposure information developed since the Harvard Center for Risk Analysis risk assessment for styrene was performed in 2002. The updated hazard assessment of styrene's health effects indicates human cancers and ototoxicity remain potential concerns. However, mechanistic research on mouse lung tumors demonstrates these tumors are mouse-specific and of low relevance to human cancer risk. The updated toxicity database supports toxicity reference levels of 20 ppm (equates to 400 mg urinary metabolites mandelic acid + phenylglyoxylic acid/g creatinine) for worker inhalation exposure and 3.7 ppm and 2.5 mg/kg bw/day, respectively, for general population inhalation and oral exposure. No cancer risk value estimates are proposed given the established lack of relevance of mouse lung tumors and inconsistent epidemiology evidence. The updated exposure assessment supports inhalation and ingestion routes as important. The updated risk assessment found estimated risks within acceptable ranges for all age groups of the general population and workers with occupational exposures in non-fiber-reinforced polymer composites industries and fiber-reinforced polymer composites (FRP) workers using closed-mold operations or open-mold operations with respiratory protection. Only FRP workers using open-mold operations not using respiratory protection have risk exceedances for styrene and should be considered for risk management measures. In addition, given the reported interaction of styrene exposure with noise, noise reduction to sustain levels below 85 dB(A) needs be in place.
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Affiliation(s)
- M I Banton
- a Gorge View Consulting LLC , Hood River , OR , USA
| | - J S Bus
- b Health Sciences , Exponent , Midland , MI , USA
| | - J J Collins
- c Health Sciences , Saginaw Valley State University , Saginaw , MI , USA
| | - E Delzell
- d Private consultant , Birmingham , AL , USA
| | | | - J E Kester
- f Kester Consulting LLC , Wentzville , MO , USA
| | | | - R Waites
- h Sabic , Innovative Plastics US LLC , Mount Vernon , IN , USA
| | - S S Sarang
- i Shell Health , Shell International , Houston , TX , USA
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8
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Venet T, Carreres-Pons M, Chalansonnet M, Thomas A, Merlen L, Nunge H, Bonfanti E, Cosnier F, Llorens J, Campo P. Continuous exposure to low-frequency noise and carbon disulfide: Combined effects on hearing. Neurotoxicology 2017; 62:151-161. [PMID: 28655499 DOI: 10.1016/j.neuro.2017.06.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Revised: 06/22/2017] [Accepted: 06/22/2017] [Indexed: 10/19/2022]
Abstract
Carbon disulfide (CS2) is used in industry; it has been shown to have neurotoxic effects, causing central and distal axonopathies.However, it is not considered cochleotoxic as it does not affect hair cells in the organ of Corti, and the only auditory effects reported in the literature were confined to the low-frequency region. No reports on the effects of combined exposure to low-frequency noise and CS2 have been published to date. This article focuses on the effects on rat hearing of combined exposure to noise with increasing concentrations of CS2 (0, 63,250, and 500ppm, 6h per day, 5 days per week, for 4 weeks). The noise used was a low-frequency noise ranging from 0.5 to 2kHz at an intensity of 106dB SPL. Auditory function was tested using distortion product oto-acoustic emissions, which mainly reflects the cochlear performances. Exposure to noise alone caused an auditory deficit in a frequency area ranging from 3.6 to 6 kHz. The damaged area was approximately one octave (6kHz) above the highest frequency of the exposure noise (2.8kHz); it was a little wider than expected based on the noise spectrum.Consequently, since maximum hearing sensitivity is located around 8kHz in rats, low-frequency noise exposure can affect the cochlear regions detecting mid-range frequencies. Co-exposure to CS2 (250-ppm and over) and noise increased the extent of the damaged frequency window since a significant auditory deficit was measured at 9.6kHz in these conditions.Moreover, the significance at 9.6kHz increased with the solvent concentrations. Histological data showed that neither hair cells nor ganglion cells were damaged by CS2. This discrepancy between functional and histological data is discussed. Like most aromatic solvents, carbon disulfide should be considered as a key parameter in hearing conservation régulations.
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Affiliation(s)
- Thomas Venet
- Institut National de Recherche et de Sécurité, Rue du Morvan, CS 60027, F-54519, Vandœuvre Cedex. France.
| | - Maria Carreres-Pons
- Institut National de Recherche et de Sécurité, Rue du Morvan, CS 60027, F-54519, Vandœuvre Cedex. France; Departament de Ciències Fisiològiques and Institute of Neurosciences, Universitat de Barcelona, 08907 L'Hospitalet de Llobregat, Catalonia, Spain
| | - Monique Chalansonnet
- Institut National de Recherche et de Sécurité, Rue du Morvan, CS 60027, F-54519, Vandœuvre Cedex. France
| | - Aurélie Thomas
- Institut National de Recherche et de Sécurité, Rue du Morvan, CS 60027, F-54519, Vandœuvre Cedex. France
| | - Lise Merlen
- Institut National de Recherche et de Sécurité, Rue du Morvan, CS 60027, F-54519, Vandœuvre Cedex. France
| | - Hervé Nunge
- Institut National de Recherche et de Sécurité, Rue du Morvan, CS 60027, F-54519, Vandœuvre Cedex. France
| | - Elodie Bonfanti
- Institut National de Recherche et de Sécurité, Rue du Morvan, CS 60027, F-54519, Vandœuvre Cedex. France
| | - Frédéric Cosnier
- Institut National de Recherche et de Sécurité, Rue du Morvan, CS 60027, F-54519, Vandœuvre Cedex. France
| | - Jordi Llorens
- Departament de Ciències Fisiològiques and Institute of Neurosciences, Universitat de Barcelona, 08907 L'Hospitalet de Llobregat, Catalonia, Spain; Institut d'Investigació Biomèdica de Bellvitge (IDIBELL), 08907 L'Hospitalet de Llobregat, Catalonia, Spain
| | - Pierre Campo
- Institut National de Recherche et de Sécurité, Rue du Morvan, CS 60027, F-54519, Vandœuvre Cedex. France; DevAH EA 3450 - Développement, Adaptation et Handicap, Régulations cardio-respiratoires et de la motricité-Université de Lorraine, F-54500 Vandœuvre, France
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Pleban FT, Oketope O, Shrestha L. Occupational Styrene Exposure on Auditory Function Among Adults: A Systematic Review of Selected Workers. Saf Health Work 2017; 8:329-336. [PMID: 29276630 PMCID: PMC5715476 DOI: 10.1016/j.shaw.2017.01.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Revised: 12/30/2016] [Accepted: 01/11/2017] [Indexed: 11/17/2022] Open
Abstract
A review study was conducted to examine the adverse effects of styrene, styrene mixtures, or styrene and/or styrene mixtures and noise on the auditory system in humans employed in occupational settings. The search included peer-reviewed articles published in English language involving human volunteers spanning a 25-year period (1990–2015). Studies included peer review journals, case–control studies, and case reports. Animal studies were excluded. An initial search identified 40 studies. After screening for inclusion, 13 studies were retrieved for full journal detail examination and review. As a whole, the results range from no to mild associations between styrene exposure and auditory dysfunction, noting relatively small sample sizes. However, four studies investigating styrene with other organic solvent mixtures and noise suggested combined exposures to both styrene organic solvent mixtures may be more ototoxic than exposure to noise alone. There is little literature examining the effect of styrene on auditory functioning in humans. Nonetheless, findings suggest public health professionals and policy makers should be made aware of the future research needs pertaining to hearing impairment and ototoxicity from styrene. It is recommended that chronic styrene-exposed individuals be routinely evaluated with a comprehensive audiological test battery to detect early signs of auditory dysfunction.
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Affiliation(s)
- Francis T Pleban
- Department of Public Health, Health Administration, and Health Sciences, Tennessee State University, Avon Williams Campus, Nashville, TN, USA
| | - Olutosin Oketope
- Department of Public Health, Health Administration, and Health Sciences, Tennessee State University, Avon Williams Campus, Nashville, TN, USA
| | - Laxmi Shrestha
- Department of Public Health, Health Administration, and Health Sciences, Tennessee State University, Avon Williams Campus, Nashville, TN, USA
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10
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Fetoni AR, Rolesi R, Paciello F, Eramo SLM, Grassi C, Troiani D, Paludetti G. Styrene enhances the noise induced oxidative stress in the cochlea and affects differently mechanosensory and supporting cells. Free Radic Biol Med 2016; 101:211-225. [PMID: 27769922 DOI: 10.1016/j.freeradbiomed.2016.10.014] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Revised: 10/03/2016] [Accepted: 10/17/2016] [Indexed: 12/20/2022]
Abstract
Experimental and human investigations have raised the level of concern about the potential ototoxicity of organic solvents and their interaction with noise. The main objective of this study was to characterize the effects of the combined noise and styrene exposure on hearing focusing on the mechanism of damage on the sensorineural cells and supporting cells of the organ of Corti and neurons of the ganglion of Corti. The impact of single and combined exposures on hearing was evaluated by auditory functional testing and histological analyses of cochlear specimens. The mechanism of damage was studied by analyzing superoxide anion and lipid peroxidation expression and by computational analyses of immunofluorescence data to evaluate and compare the oxidative stress pattern in outer hair cells versus the supporting epithelial cells of the organ of Corti. The oxidative stress hypothesis was further analyzed by evaluating the protective effect of a Coenzyme Q10 analogue, the water soluble Qter, molecule known to have protective antioxidant properties against noise induced hearing loss and by the analysis of the expression of the endogenous defense enzymes. This study provides evidence of a reciprocal noise-styrene synergism based on a redox imbalance mechanism affecting, although with a different intensity of damage, the outer hair cell (OHC) sensory epithelium. Moreover, these two damaging agents address preferentially different cochlear targets: noise mainly the sensory epithelium, styrene the supporting epithelial cells. Namely, the increase pattern of lipid peroxidation in the organ of Corti matched the cell damage distribution, involving predominantly OHC layer in noise exposed cochleae and both OHC and Deiters' cell layers in the styrene or combined exposed cochleae. The antioxidant treatment reduced the lipid peroxidation increase, potentiated the endogenous antioxidant defense system at OHC level in both exposures but it failed to ameliorate the oxidative imbalance and cell death of Deiters' cells in the styrene and combined exposures. Current antioxidant therapeutic approaches to preventing sensory loss focus on hair cells alone. It remains to be seen whether targeting supporting cells, in addition to hair cells, might be an effective approach to protecting exposed subjects.
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MESH Headings
- Animals
- Antioxidants/pharmacology
- Hair Cells, Auditory, Inner/drug effects
- Hair Cells, Auditory, Inner/metabolism
- Hair Cells, Auditory, Inner/pathology
- Hair Cells, Auditory, Outer/drug effects
- Hair Cells, Auditory, Outer/metabolism
- Hair Cells, Auditory, Outer/pathology
- Hearing Loss, Noise-Induced/metabolism
- Hearing Loss, Noise-Induced/pathology
- Hearing Loss, Noise-Induced/physiopathology
- Hearing Loss, Noise-Induced/prevention & control
- Labyrinth Supporting Cells/drug effects
- Labyrinth Supporting Cells/metabolism
- Labyrinth Supporting Cells/pathology
- Lipid Peroxidation/drug effects
- Male
- Noise/adverse effects
- Oxidation-Reduction
- Oxidative Stress
- Rats
- Rats, Wistar
- Styrene/toxicity
- Ubiquinone/analogs & derivatives
- Ubiquinone/pharmacology
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Affiliation(s)
- A R Fetoni
- Institute of Otolaryngology, Università Cattolica School of Medicine, Rome, Italy; Institute of Cell Biology and Neurobiology, CNR, Monterotondo, Italy.
| | - R Rolesi
- Institute of Otolaryngology, Università Cattolica School of Medicine, Rome, Italy
| | - F Paciello
- Institute of Otolaryngology, Università Cattolica School of Medicine, Rome, Italy; Institute of Cell Biology and Neurobiology, CNR, Monterotondo, Italy
| | - S L M Eramo
- Institute of Human Physiology, Università Cattolica School of Medicine, Rome, Italy
| | - C Grassi
- Institute of Human Physiology, Università Cattolica School of Medicine, Rome, Italy
| | - D Troiani
- Institute of Human Physiology, Università Cattolica School of Medicine, Rome, Italy
| | - G Paludetti
- Institute of Otolaryngology, Università Cattolica School of Medicine, Rome, Italy
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11
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Ryan AF, Kujawa SG, Hammill T, Le Prell C, Kil J. Temporary and Permanent Noise-induced Threshold Shifts: A Review of Basic and Clinical Observations. Otol Neurotol 2016; 37:e271-5. [PMID: 27518135 PMCID: PMC4988324 DOI: 10.1097/mao.0000000000001071] [Citation(s) in RCA: 111] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
OBJECTIVE To review basic and clinical findings relevant to defining temporary (TTS) and permanent (PTS) threshold shifts and their sequelae. DATA SOURCES Relevant scientific literature and government definitions were broadly reviewed. DATA SYNTHESIS The definitions and characteristics of TTS and PTS were assessed and recent advances that expand our knowledge of the extent, nature, and consequences of noise-induced hearing loss were reviewed. CONCLUSION Exposure to intense sound can produce TTS, acute changes in hearing sensitivity that recover over time, or PTS, a loss that does not recover to preexposure levels. In general, a threshold shift ≥10 dB at 2, 3, and 4 kHz is required for reporting purposes in human studies. The high-frequency regions of the cochlea are most sensitive to noise damage. Resonance of the ear canal also results in a frequency region of high-noise sensitivity at 4 to 6 kHz. A primary noise target is the cochlear hair cell. Although the mechanisms that underlie such hair cell damage remain unclear, there is evidence to support a role for reactive oxygen species, stress pathway signaling, and apoptosis. Another target is the synapse between the hair cell and the primary afferent neurons. Large numbers of these synapses and their neurons can be lost after noise, even though hearing thresholds may return to normal. This affects auditory processing and detection of signals in noise. The consequences of TTS and PTS include significant deficits in communication that can impact performance of military duties or obtaining/retaining civilian employment. Tinnitus and exacerbation of posttraumatic stress disorder are also potential sequelae.
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Affiliation(s)
- Allen F. Ryan
- Department of Surgery/Otolaryngology, University of California, San Diego, La Jolla, CA; and Veterans Administration, San Diego, CA, 9500 Gilman Drive #0666, La Jolla, CA 92093-0666, 858.534.4594 (voice), 858.534.5319 (fax),
| | - Sharon G. Kujawa
- Associate Professor of Otology and Laryngology, Department of Otology and Laryngology, Harvard Medical School, Boston, MA, 243 Charles Street, Boston, MA 02114
| | - Tanisha Hammill
- Defense Hearing Center of Excellence, 59MDW/SG02O, 2200 Bergquist Drive, Suite 1, JBSA Lackland, TX 78236
| | - Colleen Le Prell
- Emilie and Phil Schepps Professor of Hearing Science Program, Callier Center for Communication Disorders, 1966 Inwood Road, Room J216, Dallas, TX 75256
| | - Jonathan Kil
- Chief Medical Officer, Sound Pharmaceuticals, 4010 Stone Way N, Suite 120, Seattle, WA 98103
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Abstract
PURPOSE OF REVIEW Up to 30 million workers in the United States are exposed to potentially detrimental levels of noise. Although reliable medications for minimizing or reversing noise-induced hearing loss (NIHL) are not currently available, NIHL is entirely preventable. The purpose of this article is to review the epidemiology and pathophysiology of occupational NIHL. We will focus on at-risk populations and discuss prevention programs. Current prevention programs focus on reducing inner ear damage by minimizing environmental noise production and through the use of personal hearing protective devices. RECENT FINDINGS NIHL is the result of a complex interaction between environmental factors and patient factors, both genetic and acquired. The effects of noise exposure are specific to an individual. Trials are currently underway evaluating the role of antioxidants in protection from, and even reversal of, NIHL. SUMMARY Occupational NIHL is the most prevalent occupational disease in the United States. Occupational noise exposures may contribute to temporary or permanent threshold shifts, although even temporary threshold shifts may predispose an individual to eventual permanent hearing loss. Noise prevention programs are paramount in reducing hearing loss as a result of occupational exposures.
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Abstract
Noise is pervasive in everyday life and can cause both auditory and non-auditory health effects. Noise-induced hearing loss remains highly prevalent in occupational settings, and is increasingly caused by social noise exposure (eg, through personal music players). Our understanding of molecular mechanisms involved in noise-induced hair-cell and nerve damage has substantially increased, and preventive and therapeutic drugs will probably become available within 10 years. Evidence of the non-auditory effects of environmental noise exposure on public health is growing. Observational and experimental studies have shown that noise exposure leads to annoyance, disturbs sleep and causes daytime sleepiness, affects patient outcomes and staff performance in hospitals, increases the occurrence of hypertension and cardiovascular disease, and impairs cognitive performance in schoolchildren. In this Review, we stress the importance of adequate noise prevention and mitigation strategies for public health.
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Affiliation(s)
- Mathias Basner
- Unit for Experimental Psychiatry, Division of Sleep and Chronobiology, Department of Psychiatry, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA.
| | - Wolfgang Babisch
- Department of Environmental Hygiene, Federal Environment Agency, Berlin, Germany
| | - Adrian Davis
- Public Health England, Wellington House, Waterloo Road, London, UK; Ear Institute, University College, London, UK
| | - Mark Brink
- D-MTEC Public and Organizational Health, ETH Zurich, Zurich, Switzerland
| | - Charlotte Clark
- Centre for Psychiatry, Wolfson Institute of Preventive Medicine, Barts and London School of Medicine and Dentistry, Queen Mary University of London, UK
| | - Sabine Janssen
- Department of Urban Environment and Safety, TNO (Netherlands Organization for Applied Scientific Research), Delft, Netherlands
| | - Stephen Stansfeld
- Centre for Psychiatry, Wolfson Institute of Preventive Medicine, Barts and London School of Medicine and Dentistry, Queen Mary University of London, UK
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