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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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Tepe V, Guillory L, Boudin-George A, Cantelmo T, Murphy S. Central Auditory Processing Dysfunction in Service Members and Veterans: Treatment Considerations and Strategies. JOURNAL OF SPEECH, LANGUAGE, AND HEARING RESEARCH : JSLHR 2023:1-28. [PMID: 37379242 DOI: 10.1044/2023_jslhr-23-00095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/30/2023]
Abstract
PURPOSE Military risk factors such as blast exposure, noise exposure, head trauma, and neurotoxin exposure place Service members and Veterans at risk for deficits associated with auditory processing dysfunction. However, there is no clinical guidance specific to the treatment of auditory processing deficits in this unique population. We provide an overview of available treatments and their limited supporting evidence for use in adults, emphasizing the need for multidisciplinary case management and interdisciplinary research to support evidence-based solutions. METHOD We explored relevant literature to inform the treatment of auditory processing dysfunction in adults, with emphasis on findings involving active or former military personnel. We were able to identify a limited number of studies, pertaining primarily to the treatment of auditory processing deficits through the use of assistive technologies and training strategies. We assessed the current state of the science for knowledge gaps that warrant additional study. CONCLUSIONS Auditory processing deficits often co-occur with other military injuries and may pose significant risk in military operational and occupational settings. Research is needed to advance clinical diagnostic and rehabilitative capabilities, guide treatment planning, support effective multidisciplinary management, and inform fitness-for-duty standards. We emphasize the need for an inclusive approach to the assessment and treatment of auditory processing concerns in Service members and Veterans and for evidence-based solutions to address complex military risk factors and injuries.
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Affiliation(s)
- Victoria Tepe
- Department of Defense Hearing Center of Excellence, JBSA Lackland, TX
- The Geneva Foundation, Tacoma, WA
| | - Lisa Guillory
- Harry S. Truman Memorial Veterans' Hospital, Columbia, MO
| | - Amy Boudin-George
- Department of Defense Hearing Center of Excellence, JBSA Lackland, TX
| | - Tasha Cantelmo
- Alexander T. Augusta Military Medical Center, Fort Belvoir, VA
| | - Sara Murphy
- Department of Defense Hearing Center of Excellence, JBSA Lackland, TX
- The Geneva Foundation, Tacoma, WA
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Zhang Y, Liu Y, Li Z, Liu X, Chen Q, Qin J, Liao Q, Du R, Deng Q, Xiao Y, Xing X. Effects of coexposure to noise and mixture of toluene, ethylbenzene, xylene, and styrene (TEXS) on hearing loss in petrochemical workers of southern China. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:31620-31630. [PMID: 36449247 DOI: 10.1007/s11356-022-24414-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Accepted: 11/22/2022] [Indexed: 06/17/2023]
Abstract
Many harmful factors existing simultaneously with noise are reported to induce hearing impairment, such as organic solvents. However, the existing hearing safety limits and current risk assessment for hearing loss rely on single noise exposure. It is urgent to clarify the combined effect of noise and other harmful factors on hearing loss. Petrochemical workers are always exposed to noise and organic solvents, mainly benzene, toluene, ethylbenzene, xylene, and styrene (BTEXS), while the combined effect of their coexposure on hearing remains unclear. Herein we conducted a cross-sectional survey, measuring pure-tone audiometry of 1496 petrochemical workers in southern China. Participants exposed to BTEXS were 569, 524, 156, 452, and 177 respectively. Individual cumulative noise exposure (CNE) levels and BTEXS exposure were assessed. The average CNE was 93.27 ± 4.92 dB(A)·years, and the concentrations of BTEXS were far below the occupational exposure limits of China. Logistic regression analyses showed that CNE was consistently positively associated with hearing loss (HL) and high-frequency hearing loss (HFHL) but not related to speech-frequency hearing loss (SFHL). Compared with participants in the lowest quartile of CNE, those in the highest quartile showed an OR of 5.229 (95% CI: 3.179, 8.598) for HFHL. Two-pollutant model analysis indicated that TEXS exposure was positively associated with HL (OR 1.679, 95%CI 1.086, 2.597), SFHL (OR 2.440, 95%CI 1.255, 4.744), and HFHL (OR 1.475, 95%CI 1.077, 2.020). However, no interactions were observed between CNE and TEXS coexposure on hearing loss. In our study, covariates including smoking and drinking status, body mass index (BMI), ear protection and personal protective equipment, and use of earphone/headphone were adjusted. In conclusion, coexposure to noise and low-level TEXS could induce more severe damage on hearing function than exposure to each alone, especially SFHL. Therefore, petrochemical workers simultaneously exposed to noise and TEXS, even at low-level, should be included in hearing protection programs.
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Affiliation(s)
- Yan Zhang
- Department of Occupational and Environmental Health, School of Public Health, Sun Yat-Sen University, No. 74 Zhongshan Road 2, Yuexiu District, Guangzhou, 510080, China
| | - Yan Liu
- Department of Occupational and Environmental Health, School of Public Health, Sun Yat-Sen University, No. 74 Zhongshan Road 2, Yuexiu District, Guangzhou, 510080, China
| | - Zongxin Li
- Department of Toxicology, School of Public Health, Sun Yat-Sen University, No. 74 Zhongshan Road 2, Guangzhou, 510080, China
| | - Xin Liu
- Department of Occupational and Environmental Health, School of Public Health, Sun Yat-Sen University, No. 74 Zhongshan Road 2, Yuexiu District, Guangzhou, 510080, China
| | - Qingfei Chen
- Department of Occupational and Environmental Health, School of Public Health, Sun Yat-Sen University, No. 74 Zhongshan Road 2, Yuexiu District, Guangzhou, 510080, China
| | - Jingyao Qin
- Department of Occupational and Environmental Health, School of Public Health, Sun Yat-Sen University, No. 74 Zhongshan Road 2, Yuexiu District, Guangzhou, 510080, China
| | - Qilong Liao
- Department of Occupational and Environmental Health, School of Public Health, Sun Yat-Sen University, No. 74 Zhongshan Road 2, Yuexiu District, Guangzhou, 510080, China
| | - Rui Du
- Department of Occupational and Environmental Health, School of Public Health, Sun Yat-Sen University, No. 74 Zhongshan Road 2, Yuexiu District, Guangzhou, 510080, China
| | - Qifei Deng
- Department of Occupational and Environmental Health, School of Public Health, Sun Yat-Sen University, No. 74 Zhongshan Road 2, Yuexiu District, Guangzhou, 510080, China
| | - Yongmei Xiao
- Department of Occupational and Environmental Health, School of Public Health, Sun Yat-Sen University, No. 74 Zhongshan Road 2, Yuexiu District, Guangzhou, 510080, China
| | - Xiumei Xing
- Department of Occupational and Environmental Health, School of Public Health, Sun Yat-Sen University, No. 74 Zhongshan Road 2, Yuexiu District, Guangzhou, 510080, China.
- Department of Toxicology, School of Public Health, Sun Yat-Sen University, No. 74 Zhongshan Road 2, Guangzhou, 510080, China.
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Bohn V, Morata TC, Roggia S, Zucki F, Pouyatos B, Venet T, Krieg E, José MR, de Lacerda ABM. Temporary and Permanent Auditory Effects Associated with Occupational Coexposure to Low Levels of Noise and Solvents. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:9894. [PMID: 36011533 PMCID: PMC9408218 DOI: 10.3390/ijerph19169894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 08/05/2022] [Accepted: 08/06/2022] [Indexed: 06/15/2023]
Abstract
This study aimed to assess temporary and permanent auditory effects associated with occupational coexposure to low levels of noise and solvents. Cross-sectional study with 25 printing industry workers simultaneously exposed to low noise (<80 dBA TWA) and low levels of solvents. The control group consisted of 29 industry workers without the selected exposures. Participants answered a questionnaire and underwent auditory tests. Auditory fatigue was measured by comparing the acoustic reflex threshold before and after the workday. Workers coexposed to solvents and noise showed significantly worse results in auditory tests in comparison with the participants in the control group. Auditory brainstem response results showed differences in III−V interpeak intervals (p = 0.046 in right ear; p = 0.039 in left ear). Mean dichotic digits scores (exposed = 89.5 ± 13.33; controls = 96.40 ± 4.46) were only different in the left ear (p = 0.054). The comparison of pre and postacoustic reflex testing indicated mean differences (p = 0.032) between the exposed (4.58 ± 6.8) and controls (0 ± 4.62) groups. This study provides evidence of a possible temporary effect (hearing fatigue) at the level of the acoustic reflex of the stapedius muscle. The permanent effects were identified mainly at the level of the high brainstem and in the auditory ability of binaural integration.
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Affiliation(s)
- Vanessa Bohn
- Post Graduate Program of Communication Disorders, University Tuiuti of Paraná, Curitiba 82010-330, Brazil
| | - Thais C. Morata
- National Institute for Occupational Safety and Health (NIOSH), Cincinnati, OH 45226, USA
| | - Simone Roggia
- Department of Audiology and Speech Therapy, Federal University of Santa Catarina, Florianopolis 88030-300, Brazil
| | - Fernanda Zucki
- Department of Audiology and Speech Therapy, Federal University of Santa Catarina, Florianopolis 88030-300, Brazil
| | - Benoît Pouyatos
- Institut National de Recherche et Sécurité (INRS), 54519 Vandoeuvre-lès-Nancy, France
| | - Thomas Venet
- Institut National de Recherche et Sécurité (INRS), 54519 Vandoeuvre-lès-Nancy, France
| | - Edward Krieg
- National Institute for Occupational Safety and Health (NIOSH), Cincinnati, OH 45226, USA
| | - Maria Renata José
- Post Graduate Program of Communication Disorders, University Tuiuti of Paraná, Curitiba 82010-330, Brazil
| | - Adriana B. M. de Lacerda
- Audiology Department, Speech Language and Audiology School, Medicine Faculty, University of Montréal, Montreal, QC H3C 3J7, Canada
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Dreisbach L, Murphy S, Arevalo R, Schlocker C, Miller T, Guthrie OW. Is jet fuel exposure associated with central auditory nervous system difficulties: An exploratory study in military personnel. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2022; 151:2027. [PMID: 35364904 DOI: 10.1121/10.0009845] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Accepted: 03/04/2022] [Indexed: 06/14/2023]
Abstract
Central auditory nervous system dysfunction (CANSD) can manifest as hearing difficulty in the absence of audiometric abnormalities. Effects of noise or jet fuel exposure on the CANS are documented in animal models and humans. This study screened military personnel using the modified Amsterdam Inventory for Auditory Disability (mAIAD) to assess whether concurrent jet fuel and noise (JFN) exposures potentiate central auditory difficulties compared to noise only exposures. A total of 48 age- and sex-matched participants were recruited: 24 military bulk fuel specialists (JFN) and 24 military personnel without jet fuel exposure. All participants completed the mAIAD, the Noise Exposure Questionnaire, and basic audiological testing. Results revealed non-significant differences in pure-tone thresholds between groups, but the JFN group had higher noise exposures. Additionally, the JFN group revealed consistently lower mAIAD scores compared to the noise only group. Interestingly, a JFN stratified subgroup reporting more listening difficulty exhibited statistically significant lower mAIAD scores in the speech intelligibility in noise subdomain. These preliminary data suggest that jet fuel exposure may potentiate noise-induced CANSD, such as speech-in-noise difficulties. Such difficulties may be more prominent among specific military personnel with combined exposures. Hearing conservation programs could add CANSD screening by use of the mAIAD.
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Affiliation(s)
- Laura Dreisbach
- School of Speech, Language and Hearing Sciences, San Diego State University, 5500 Campanile Drive, San Diego, California 92182-1518, USA
| | - Sara Murphy
- Navy Medicine Readiness and Training Command San Diego (NMRTC SD), 34800 Bob Wilson Drive, San Diego, California 92134, USA
| | - Reginald Arevalo
- School of Speech, Language and Hearing Sciences, San Diego State University, 5500 Campanile Drive, San Diego, California 92182-1518, USA
| | - Caroline Schlocker
- Navy Medicine Readiness and Training Command San Diego (NMRTC SD), 34800 Bob Wilson Drive, San Diego, California 92134, USA
| | - Tanner Miller
- Navy Medicine Readiness and Training Command San Diego (NMRTC SD), 34800 Bob Wilson Drive, San Diego, California 92134, USA
| | - O'neil Winston Guthrie
- Department of Communication Sciences and Disorders, Northern Arizona University, 208 E. Pine Knoll Drive, Flagstaff, Arizona 86011, USA
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Malheiros MKS, Câmara VDM, Garcia TR, Cavalcante DC, Mendonça LWD, Andrade MIKPD. Comparative Study of Evoked Otoacoustic Emissions in Offshore and Onshore Seafaring Workers. Codas 2021; 33:e20200178. [PMID: 33978109 DOI: 10.1590/2317-1782/20202020178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Accepted: 08/24/2020] [Indexed: 11/22/2022] Open
Abstract
PURPOSE To evaluate the cochlear function of offshore and onshore seafaring workers of a naval company in the city of Rio de Janeiro and to estimate the degree of association between occupational exposure to noise and/or chemical substances and alteration in cochlear function. METHODS This study evaluated seafaring workers aged 20 to 49, of both genders, without auditory symptoms, divided into two groups: the Offshore Group, operating in the high seas with occupational exposure; and the Onshore Group, operating in offices without occupational exposure. Exams were performed to evaluate cochlear function, including transient evoked otoacoustic emissions (TEOAE) and distortion product otoacoustic emissions (DPOAE). RESULTS The TEOAE and DPOAE responses were on average lower in the Offshore Group, for all frequencies analyzed. The proportion of failures observed was also higher in the exposure group (Offshore), for general response and specific frequency, mainly for the frequencies of 4 kHz for TEOAE and 6 kHz for DPOAE. CONCLUSION The results suggest that exposure to noise and/or chemical substances can contribute to alterations in cochlear function in seafarers even without manifesting auditory symptoms.
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Fetoni AR, Paciello F, Rolesi R, Pisani A, Moleti A, Sisto R, Troiani D, Paludetti G, Grassi C. Styrene targets sensory and neural cochlear function through the crossroad between oxidative stress and inflammation. Free Radic Biol Med 2021; 163:31-42. [PMID: 33307165 DOI: 10.1016/j.freeradbiomed.2020.12.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 11/30/2020] [Accepted: 12/02/2020] [Indexed: 01/12/2023]
Abstract
BACKGROUND Although styrene is an established ototoxic agent at occupational exposure levels, the mechanisms of styrene toxicity in the auditory system are still unclear. OBJECTIVES The aim of this study was to identify the consequences of styrene chronic exposure in cochlear structures, looking for the mechanisms of ototoxicity of this organic compound and focusing on cell targets and oxidative stress/inflammatory processes. METHODS Male adult Wistar rats were exposed to styrene (400 mg/kg by gavage for 5 days/week, 3 consecutive weeks). Hearing loss was evaluated by measuring auditory brainstem responses (ABR), morphological analysis were performed to evaluate hair cell and spiral ganglion neuron survival, as well as synaptic damage. Analysis of apoptotic (p53) and inflammatory (NF-κB, TNF-α, IL-1β and IL-10) mediators were performed by immunofluorescence analysis and western blot. RESULTS Styrene ototoxic effects induced a hearing loss of about 35-40 dB. Immunofluorescence and western blotting analyses demonstrated that styrene administration induced redox imbalance and activated inflammatory processes, targeting sensory hair cell and neural dysfunction by a cross-talk between oxidative and inflammatory mediators. DISCUSSION Major findings connect styrene ototoxicity to an interplay between redox imbalance and inflammation, leading to the intriguing assumption of a mixed sensory and neural styrene-induced ototoxicity. Thus, in a clinical perspective, data reported here have important implications for styrene risk assessment in humans.
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Affiliation(s)
- Anna Rita Fetoni
- Fondazione Policlinico Universitario A. Gemelli IRCCS, Roma, Italy; Department of Head and Neck Surgery, Università Cattolica Del Sacro Cuore, Roma, Italy.
| | - Fabiola Paciello
- Fondazione Policlinico Universitario A. Gemelli IRCCS, Roma, Italy; Department of Neuroscience, Università Cattolica Del Sacro Cuore, Roma, Italy
| | - Rolando Rolesi
- Fondazione Policlinico Universitario A. Gemelli IRCCS, Roma, Italy; Department of Head and Neck Surgery, Università Cattolica Del Sacro Cuore, Roma, Italy
| | - Anna Pisani
- Department of Head and Neck Surgery, Università Cattolica Del Sacro Cuore, Roma, Italy
| | - Arturo Moleti
- Department of Physics, University of Roma Tor Vergata, Roma, Italy
| | - Renata Sisto
- Department of Occupational and Environmental Medicine, Epidemiology and Hygiene, Italian Workers' Compensation Authority (INAIL), Monte Porzio Catone (RM), Italy
| | - Diana Troiani
- Department of Neuroscience, Università Cattolica Del Sacro Cuore, Roma, Italy
| | - Gaetano Paludetti
- Fondazione Policlinico Universitario A. Gemelli IRCCS, Roma, Italy; Department of Head and Neck Surgery, Università Cattolica Del Sacro Cuore, Roma, Italy
| | - Claudio Grassi
- Fondazione Policlinico Universitario A. Gemelli IRCCS, Roma, Italy; Department of Neuroscience, Università Cattolica Del Sacro Cuore, Roma, Italy
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Koerner TK, A. Papesh M, Gallun FJ. A Questionnaire Survey of Current Rehabilitation Practices for Adults With Normal Hearing Sensitivity Who Experience Auditory Difficulties. Am J Audiol 2020; 29:738-761. [PMID: 32966118 DOI: 10.1044/2020_aja-20-00027] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Purpose A questionnaire survey was conducted to collect information from clinical audiologists about rehabilitation options for adult patients who report significant auditory difficulties despite having normal or near-normal hearing sensitivity. This work aimed to provide more information about what audiologists are currently doing in the clinic to manage auditory difficulties in this patient population and their views on the efficacy of recommended rehabilitation methods. Method A questionnaire survey containing multiple-choice and open-ended questions was developed and disseminated online. Invitations to participate were delivered via e-mail listservs and through business cards provided at annual audiology conferences. All responses were anonymous at the time of data collection. Results Responses were collected from 209 participants. The majority of participants reported seeing at least one normal-hearing patient per month who reported significant communication difficulties. However, few respondents indicated that their location had specific protocols for the treatment of these patients. Counseling was reported as the most frequent rehabilitation method, but results revealed that audiologists across various work settings are also successfully starting to fit patients with mild-gain hearing aids. Responses indicated that patient compliance with computer-based auditory training methods was regarded as low, with patients generally preferring device-based rehabilitation options. Conclusions Results from this questionnaire survey strongly suggest that audiologists frequently see normal-hearing patients who report auditory difficulties, but that few clinicians are equipped with established protocols for diagnosis and management. While many feel that mild-gain hearing aids provide considerable benefit for these patients, very little research has been conducted to date to support the use of hearing aids or other rehabilitation options for this unique patient population. This study reveals the critical need for additional research to establish evidence-based practice guidelines that will empower clinicians to provide a high level of clinical care and effective rehabilitation strategies to these patients.
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Affiliation(s)
- Tess K. Koerner
- VA RR&D National Center for Rehabilitative Auditory Research, VA Portland Health Care System, OR
| | - Melissa A. Papesh
- VA RR&D National Center for Rehabilitative Auditory Research, VA Portland Health Care System, OR
- Department of Otolaryngology - Head & Neck Surgery, Oregon Health & Science University, Portland
| | - Frederick J. Gallun
- VA RR&D National Center for Rehabilitative Auditory Research, VA Portland Health Care System, OR
- Department of Otolaryngology - Head & Neck Surgery, Oregon Health & Science University, Portland
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Cabello-López A, Chávez-Gómez NL, Torres-Valenzuela A, Aguilar-Madrid G, Trujillo-Reyes O, Madrigal-Esquivel C, Haro-García LC, Skjönsberg Å, Juárez-Pérez CA. Audiometric findings of printing press workers exposed to noise and organic solvents. Int J Audiol 2020; 60:8-15. [PMID: 32731779 DOI: 10.1080/14992027.2020.1795735] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
OBJECTIVE To determine if exposure to organic solvents and noise is associated with audiometric results among workers from a printing press in Mexico City. DESIGN Cross-sectional study. STUDY SAMPLE One hundred and seventy-six male workers at a printing press in Mexico City exposed to noise and organic solvents, including xylene, and 103 non-exposed male workers as reference group. Hearing thresholds were assessed with pure-tone audiometry. RESULTS Poorer hearing thresholds were observed among printing workers than non-exposed controls, particularly among groups with over 5 years of exposure. Hearing thresholds differences were observed in the frequencies above 500 Hz, especially in 4000 Hz in all exposure groups compared to the reference. Adjusted models for age and previous exposure to noise and organic solvents showed worse hearing thresholds as years of seniority increased -β coefficients (95% CI): ≤5 years: 3.06 dB (0.01, 6.10); >5-10 years: 4.51 dB (1.13, 7.89); >10 years: 4.58 dB (1.20, 7.96). Further analyses showed no interaction between noise and organic solvents on hearing thresholds, considering both current and previous occupational exposures. CONCLUSION Exposure to noise levels that were below recommended exposure limits and organic solvents were associated with poorer hearing thresholds than those observed among non-exposed study participants. This suggests that workers exposed to solvents should be included in hearing conservation programmes, even when noise exposures are below 85 dB. If only noise levels were taken into consideration in the risk assessment of this worker population, the risk of hearing effects could have been overlooked.
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Affiliation(s)
- Alejandro Cabello-López
- Occupational Health Research Unit, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico City, Mexico
| | - Nancy Libertad Chávez-Gómez
- Division of Internal Medicine, Hospital Regional "Adolfo López Mateos", Instituto de Seguridad y Servicios Sociales de los Trabajadores del Estado, Mexico City, Mexico
| | - Arturo Torres-Valenzuela
- Division of Audiology, Hospital de Especialidades, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico City, Mexico
| | - Guadalupe Aguilar-Madrid
- Division of Research and Postgraduate Education, Claustro Universitario de Chihuahua, Chihuahua, Mexico
| | - Oscar Trujillo-Reyes
- Occupational Health Research Unit, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico City, Mexico
| | - Claudia Madrigal-Esquivel
- Occupational Health Research Unit, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico City, Mexico
| | | | - Åsa Skjönsberg
- Department of Clinical Science, Intervention and Technology, Division of Audiology, Karolinska Institutet, Huddinge, Sweden
| | - Cuauhtémoc Arturo Juárez-Pérez
- Occupational Health Research Unit, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico City, Mexico
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Meyer C, Hickson L. Nursing Management of Hearing Impairment in Nursing Facility Residents. J Gerontol Nurs 2020; 46:15-25. [DOI: 10.3928/00989134-20200605-04] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Tepe V, Papesh M, Russell S, Lewis MS, Pryor N, Guillory L. Acquired Central Auditory Processing Disorder in Service Members and Veterans. JOURNAL OF SPEECH, LANGUAGE, AND HEARING RESEARCH : JSLHR 2020; 63:834-857. [PMID: 32163310 DOI: 10.1044/2019_jslhr-19-00293] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Purpose A growing body of evidence suggests that military service members and military veterans are at risk for deficits in central auditory processing. Risk factors include exposure to blast, neurotrauma, hazardous noise, and ototoxicants. We overview these risk factors and comorbidities, address implications for clinical assessment and care of central auditory processing deficits in service members and veterans, and specify knowledge gaps that warrant research. Method We reviewed the literature to identify studies of risk factors, assessment, and care of central auditory processing deficits in service members and veterans. We also assessed the current state of the science for knowledge gaps that warrant additional study. This literature review describes key findings relating to military risk factors and clinical considerations for the assessment and care of those exposed. Conclusions Central auditory processing deficits are associated with exposure to known military risk factors. Research is needed to characterize mechanisms, sources of variance, and differential diagnosis in this population. Existing best practices do not explicitly consider confounds faced by military personnel. Assessment and rehabilitation strategies that account for these challenges are needed. Finally, investment is critical to ensure that Veterans Affairs and Department of Defense clinical staff are informed, trained, and equipped to implement effective patient care.
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Affiliation(s)
- Victoria Tepe
- Department of Defense Hearing Center of Excellence, JBSA Lackland, TX
- The Geneva Foundation, Tacoma, WA
| | - Melissa Papesh
- VA RR&D National Center for Rehabilitative Auditory Research, VA Portland Health Care System, OR
- Department of Otolaryngology-Head & Neck Surgery, Oregon Health & Science University, Portland
| | - Shoshannah Russell
- Walter Reed National Military Medical Center, Bethesda, MD
- Henry Jackson Foundation, Bethesda, MD
| | - M Samantha Lewis
- VA RR&D National Center for Rehabilitative Auditory Research, VA Portland Health Care System, OR
- Department of Otolaryngology-Head & Neck Surgery, Oregon Health & Science University, Portland
- School of Audiology, Pacific University, Hillsboro, OR
| | - Nina Pryor
- Department of Defense Hearing Center of Excellence, JBSA Lackland, TX
- Air Force Research Laboratory, Wright-Patterson Air Force Base, OH
| | - Lisa Guillory
- Harry S. Truman Memorial Veterans' Hospital, Columbia, MO
- Department of Otolaryngology-Head and Neck Surgery, School of Medicine, University of Missouri, Columbia
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Sliwinska-Kowalska M, Fuente A, Zamyslowska-Szmytke E. Cochlear dysfunction is associated with styrene exposure in humans. PLoS One 2020; 15:e0227978. [PMID: 31961907 PMCID: PMC6974250 DOI: 10.1371/journal.pone.0227978] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2019] [Accepted: 01/03/2020] [Indexed: 11/30/2022] Open
Abstract
AIM Occupational exposure to styrene has been shown to be associated with an increased probability of developing hearing loss. However, the sites of lesions in the auditory system in humans remain unknown. The aim of this study was to investigate the possible adverse effects of styrene exposure on the cochlea of human subjects. DESIGN The hearing function of 98 styrene-exposed male workers from the glass fibre-reinforced plastics industry (mean concentration of 55 mg/m3) was evaluated bilaterally using pure-tone audiometry (1000-16000 Hz), distortion product otoacoustic emissions (DPOAEs), and auditory brainstem response (ABR). The results were compared to a group of 111 male workers exposed to noise (above 85 dBA) and 70 male white-collar workers exposed to neither noise nor solvents. Age and noise exposure levels were accounted for as confounding variables in all statistical models. RESULTS Styrene exposure was significantly associated with poorer pure-tone thresholds (1-8 kHz), lower DPOAE amplitudes (5-6 kHz), and shorter wave V latencies in both ears compared to control-group subjects. Similar results were found among noise-exposed subjects. A further analysis with wave V latency showed that styrene-exposed subjects showed significantly shorter latencies than expected according to normative data. These results suggest that occupational exposure to styrene at moderate concentrations is associated with cochlear dysfunction, at least at high frequencies. DPOAEs may be considered a valuable diagnostic tool in hearing conservation programs in workers exposed to styrene.
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Affiliation(s)
| | - Adrian Fuente
- Centre de recherche de l’Institut universitaire de gériatrie de Montréal, Québec, Canada
- École d’orthophonie et d’audiologie, Faculté de médecine, Université de Montréal, Québec, Canada
| | - Ewa Zamyslowska-Szmytke
- Department of Audiology and Phoniatrics, Nofer Institute of Occupational Medicine, Lodz, Poland
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Sisto R, Cerini L, Sanjust F, Carbonari D, Gherardi M, Gordiani A, L'Episcopo N, Paci E, Pigini D, Tranfo G, Moleti A. Distortion product otoacoustic emission sensitivity to different solvents in a population of industrial painters. Int J Audiol 2020; 59:443-454. [PMID: 31910691 DOI: 10.1080/14992027.2019.1710776] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Objective: To evaluate the ototoxic effect of the exposure to different organic solvents and noise using distortion product otoacoustic emissions (DPOAEs).Design: The exposure to different solvents was evaluated by measuring, before and at the end of the work-shift, the urinary concentrations of solvent metabolites used as dose biomarkers. The urinary concentrations of DNA and RNA oxidation products were also measured as biomarkers of oxidative damage. The simultaneous exposure to noise was also evaluated. DPOAEs and pure tone audiometry (PTA) were used as outcome variables, and were correlated to the exposure variables using mixed effect linear regression models.Study sample: Seventeen industrial painters exposed to a solvent mixture in a naval industry. A sample size of 15 was estimated from previous studies as sufficient for discriminating small hearing level and DPOAE level differences (5 dB and 2 dB, respectively) at a 95% confidence level.Results: Statistically significant associations were found between the DPOAE level and the urinary dose biomarkers and the oxidative damage biomarkers. DPOAE level and the logarithm of the metabolite concentration showed a significant negative correlation.Conclusions: DPOAE are sensitive biomarkers of exposure to ototoxic substances and can be effectively used for the early detection of hearing dysfunction.
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Affiliation(s)
- Renata Sisto
- Department of Occupational and Environmental Medicine, Epidemiology and Hygiene, INAIL Research, Monteporzio Catone, Italy
| | - Luigi Cerini
- Department of Occupational and Environmental Medicine, Epidemiology and Hygiene, INAIL Research, Monteporzio Catone, Italy
| | - Filippo Sanjust
- Department of Occupational and Environmental Medicine, Epidemiology and Hygiene, INAIL Research, Monteporzio Catone, Italy
| | - Damiano Carbonari
- Department of Occupational and Environmental Medicine, Epidemiology and Hygiene, INAIL Research, Monteporzio Catone, Italy
| | - Monica Gherardi
- Department of Occupational and Environmental Medicine, Epidemiology and Hygiene, INAIL Research, Monteporzio Catone, Italy
| | - Andrea Gordiani
- Department of Occupational and Environmental Medicine, Epidemiology and Hygiene, INAIL Research, Monteporzio Catone, Italy
| | - Nunziata L'Episcopo
- Department of Occupational and Environmental Medicine, Epidemiology and Hygiene, INAIL Research, Monteporzio Catone, Italy
| | - Enrico Paci
- Department of Occupational and Environmental Medicine, Epidemiology and Hygiene, INAIL Research, Monteporzio Catone, Italy
| | - Daniela Pigini
- Department of Occupational and Environmental Medicine, Epidemiology and Hygiene, INAIL Research, Monteporzio Catone, Italy
| | - Giovanna Tranfo
- Department of Occupational and Environmental Medicine, Epidemiology and Hygiene, INAIL Research, Monteporzio Catone, Italy
| | - Arturo Moleti
- Department of Physics, University of Roma 'Tor Vergata', Rome, Italy
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Nakhooda F, Sartorius B, Govender SM. The effects of combined exposure of solvents and noise on auditory function - A systematic review and meta-analysis. SOUTH AFRICAN JOURNAL OF COMMUNICATION DISORDERS 2019; 66:e1-e11. [PMID: 31170785 PMCID: PMC6556967 DOI: 10.4102/sajcd.v66i1.568] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2017] [Revised: 06/12/2018] [Accepted: 07/15/2018] [Indexed: 11/01/2022] Open
Abstract
BACKGROUND Chemical substances can negatively affect the auditory system. Chemical substances alone or combined with high-level noise have recently become a major concern as a cause of occupational hearing loss. OBJECTIVE To assess the combined effect of solvents and noise versus solvents only, or noise only, on the auditory function of workers. METHOD Published articles which included noise and/or solvent exposure or combined effects of solvents and noise, studies conducted on human beings only and the use of audiological tests on participants. RESULTS Thirteen papers were eligible for inclusion. The participants' ages ranged from 18 to 68 years. Results revealed that 24.5% presented with hearing loss as a result of noise exposure only; 18% presented with hearing loss owing to solvent exposure only; and a total of 43.3% presented with hearing loss owing to combined noise and solvent exposure. Furthermore, the prevalence of hearing loss in the noise and solvent group was significantly (p < 0.001) higher than the other groups in 10 out of the 13 studies analysed, with a pooled odds ratio (OR) of 2.754. Of the 178 participants (total of all participants exposed to solvents), a total of 32 participants presented with auditory pathology as a result of exposure to solvents only. There was a significantly higher pooled odds of hearing loss in noise and solvent-exposed group compared to solvent-only group (pooled OR = 2.15, 95% CI: 1.24-3.72, p = 0.006). CONCLUSION The findings revealed significantly higher odds of acquiring hearing loss when workers were exposed to a combination of solvents and noise as opposed to solvents only, motivating for its inclusion into hearing conservation programmes.
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Affiliation(s)
- Faatima Nakhooda
- Discipline of Audiology, School of Health Sciences, University of KwaZulu-Natal, Durban.
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Roggia SM, de França AG, Morata TC, Krieg E, Earl BR. Auditory system dysfunction in Brazilian gasoline station workers. Int J Audiol 2019; 58:484-496. [PMID: 31017499 DOI: 10.1080/14992027.2019.1597286] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Objective: To examine the auditory system of Brazilian gasoline station workers using an extensive audiological test battery. Design: This was a cross-sectional study. The audiological evaluation included a questionnaire, pure-tone audiometry, acoustic immittance tests, transient-evoked otoacoustic emissions (TEOAEs), distortion product otoacoustic emissions (DPOAEs), auditory brainstem response (ABR) and P300 auditory-evoked potentials. Study sample: A total of 77 Brazilian gasoline station workers were evaluated, and their results were compared with those of 36 participants who were not exposed to chemicals or noise at work. The gasoline station employees worked in 18 different gas stations, and the noise area measurements from all gas stations revealed time-weighted averages below 85 dBA. Results: Of the 77 gasoline station workers evaluated, 67.5% had audiometric results within the normal range, but 59.7% reported difficulties in communication in noisy places. Gasoline station workers showed significantly poorer results than non-exposed control participants in one or more conditions of each of the audiological tests used, except P300. Conclusions: The results suggest that the gasoline station workers have both peripheral and central auditory dysfunctions that could be partly explained by their exposure to gasoline.
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Affiliation(s)
- Simone Mariotti Roggia
- a Department of Audiology and Speech Therapy , Federal University of Santa Catarina , Florianopolis , Brazil
| | | | - Thais C Morata
- c National Institute for Occupational Safety and Heath , Cincinnati , OH , USA
| | - Edward Krieg
- c National Institute for Occupational Safety and Heath , Cincinnati , OH , USA
| | - Brian R Earl
- d Department of Communication Sciences and Disorders , University of Cincinnati , Cincinnati , OH , USA
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Staudt AM, Whitworth KW, Chien LC, Whitehead LW, Gimeno Ruiz de Porras D. Association of organic solvents and occupational noise on hearing loss and tinnitus among adults in the U.S., 1999-2004. Int Arch Occup Environ Health 2019; 92:403-413. [PMID: 30806784 PMCID: PMC8849935 DOI: 10.1007/s00420-019-01419-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Accepted: 02/19/2019] [Indexed: 10/27/2022]
Abstract
PURPOSE Exposure to organic solvents and noise may be causal agents in the development of hearing loss and tinnitus. The objectives of the present study were to examine the association of organic solvents with hearing loss and tinnitus and to assess the interaction of organic solvent and occupational noise exposure on hearing loss and tinnitus. METHODS A secondary data analysis of data from the National Health and Nutrition Examination Survey and Occupational Information Network (O*NET) among a study population ranging from 1085 to 2471 study participants from 1999 to 2004. Multiple multivariate logistic regression models were used to assess the associations of individual organic solvent exposures as measured by blood biomarkers (1,4-dichlorobenzene, benzene, ethylbenzene, styrene, toluene, o-xylene, and m-/p-xylene) with self-reported hearing loss, audiometrically assessed hearing loss, and self-reported tinnitus. Models were adjusted for age, gender, race/ethnicity, diabetes, non-occupational noise exposure, smoking, and income. Organic solvents found to be statistically significantly associated with the outcome after adjusting for covariates were tested for interaction with occupational noise exposure. RESULTS Solvent exposure was not statistically significantly associated with self-reported tinnitus. Benzene (OR 1.43, 95% CI 1.15-1.78), ethylbenzene (OR 1.24, 95% CI 1.02-1.50), and toluene (OR 1.27, 95% CI 1.06-1.52) concentrations were statistically significantly associated with increased adjusted odds of high-frequency hearing loss. No statistically significant interaction was observed between these solvents and occupational noise on high-frequency hearing loss. CONCLUSIONS We found no evidence of an association between organic solvents and tinnitus; however, there was evidence of an association between organic solvent exposure and prevalence of high-frequency hearing loss.
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Affiliation(s)
- Amanda M. Staudt
- Systems of Care for Complex Patients (SCCP) Task Area, US Army Institute of Surgical Research, 3698 Chambers Pass, JBSA Fort Sam Houston, San Antonio, TX 78234, USA,Southwest Center for Occupational and Environmental Health, Department of Epidemiology, Human Genetics and Environmental Sciences, School of Public Health in San Antonio, The University of Texas Health Science Center at Houston, San Antonio, TX, USA
| | - Kristina W. Whitworth
- Southwest Center for Occupational and Environmental Health, Department of Epidemiology, Human Genetics and Environmental Sciences, School of Public Health in San Antonio, The University of Texas Health Science Center at Houston, San Antonio, TX, USA
| | - Lung-Chang Chien
- Epidemiology and Biostatistics Program, Department of Environmental and Occupational Health, School of Community Health Sciences, University of Nevada, Las Vegas, USA
| | - Lawrence W. Whitehead
- Southwest Center for Occupational and Environmental Health, Department of Epidemiology, Human Genetics and Environmental Sciences, School of Public Health, The University of Texas Health Science Center at Houston, Houston, TX, USA
| | - David Gimeno Ruiz de Porras
- Southwest Center for Occupational and Environmental Health, Department of Epidemiology, Human Genetics and Environmental Sciences, School of Public Health in San Antonio, The University of Texas Health Science Center at Houston, San Antonio, TX, USA,Center for Research in Occupational Health (CISAL), Universitat Pompeu Fabra, Barcelona, Spain,CIBER of Epidemiology and Public Health, Barcelona, Spain
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Silva TFD, Rodrigues DDRF, Coutinho GBF, Soares M, Almeida MSD, Sarcinelli PDN, Mattos RDCODC, Larentis AL, Matos GGDO. Ototoxicity of hydrocarbons present in gasoline: a literature review. REVISTA CEFAC 2018. [DOI: 10.1590/1982-021620182015617] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
ABSTRACT Purpose: to investigate the toxicity effects of major hydrocarbons present in gasoline on the auditory system and the related mechanisms of action. Methods: a literature review between 2005 and 2015 was conducted using LILACS, MEDLINE and SciELO, by combining descriptors and their respective terms in Portuguese, English and Spanish. Results: studies performed in humans and animals with hearing impairment, confirmed by morphological tests in rats, the influence of factors such as dose, duration, species and type of stimulus in hearing loss, and ineffective protection of workers by the threshold levels of exposure in the mixture of the compounds, were chosen. Conclusion: toluene is regarded as an ototoxic compound that damages outer hair cells in the middle region of the cochlea, with evidence of interaction with noise. Ethylbenzene and xylenes can be considered potentially ototoxic based on the results of animal studies. No sufficient data were found on benzene to form a conclusion.
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França DMVR, Bender Moreira Lacerda A, Lobato D, Ribas A, Ziliotto Dias K, Leroux T, Fuente A. Adverse effects of pesticides on central auditory functions in tobacco growers. Int J Audiol 2017; 56:233-241. [PMID: 27869513 DOI: 10.1080/14992027.2016.1255787] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
OBJECTIVE To investigate the effects of exposure to pesticides on the central auditory functions (CAF) of Brazilian tobacco growers. DESIGN This was a cross-sectional study carried out between 2010 and 2012. Participants were evaluated with two behavioural procedures to investigate CAF, the random gap detection test (RGDT) and the dichotic digit test in Portuguese (DDT). STUDY SAMPLE A total of 22 growers exposed to pesticides (study group) and 21 subjects who were not exposed to pesticides (control group) were selected. RESULTS No significant differences between groups were observed for pure-tone thresholds. A significant association between pesticide exposure and the results for RGDT and DDT was found. Significant differences between pesticide-exposed and nonexposed subjects were found for RGDT frequency average and DDT binaural average, when including age and hearing level as covariates. Age was significantly associated with RGDT frequency average, DDT left ear score, DDT binaural average and DDT right ear advantage. Hearing levels were not significantly associated with any of the test scores. The relative risk of failing the DDT and RGDT for the study group was 1.88 (95% CI: 1.10-3.20) and 1.74 (95% CI: 1.06-2.86), respectively, as compared with the control group. CONCLUSIONS The results showed that tobacco growers exposed to pesticides exhibited signs of central auditory dysfunction characterised by decrements in temporal processing and binaural integration processes/abilities.
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Affiliation(s)
| | | | - Diolen Lobato
- b Universidade Tuiuti do Paraná , Curitiba , Brazil , and
| | - Angela Ribas
- b Universidade Tuiuti do Paraná , Curitiba , Brazil , and
| | | | - Tony Leroux
- d Université de Montréal , Montreal , Canada
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Rawool VW. Emerging technologies with potential for objectively evaluating speech recognition skills. Int J Audiol 2016; 55 Suppl 1:S41-50. [PMID: 26807789 DOI: 10.3109/14992027.2015.1128570] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Work-related exposure to noise and other ototoxins can cause damage to the cochlea, synapses between the inner hair cells, the auditory nerve fibers, and higher auditory pathways, leading to difficulties in recognizing speech. Procedures designed to determine speech recognition scores (SRS) in an objective manner can be helpful in disability compensation cases where the worker claims to have poor speech perception due to exposure to noise or ototoxins. Such measures can also be helpful in determining SRS in individuals who cannot provide reliable responses to speech stimuli, including patients with Alzheimer's disease, traumatic brain injuries, and infants with and without hearing loss. Cost-effective neural monitoring hardware and software is being rapidly refined due to the high demand for neurogaming (games involving the use of brain-computer interfaces), health, and other applications. More specifically, two related advances in neuro-technology include relative ease in recording neural activity and availability of sophisticated analysing techniques. These techniques are reviewed in the current article and their applications for developing objective SRS procedures are proposed. Issues related to neuroaudioethics (ethics related to collection of neural data evoked by auditory stimuli including speech) and neurosecurity (preservation of a person's neural mechanisms and free will) are also discussed.
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Affiliation(s)
- Vishakha Waman Rawool
- a Department of Communication Sciences & Disorders , West Virginia University , Morgantown , USA
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Mont'Alverne LR, Corona AP, Rêgo MAV. Perda auditiva associada à exposição ocupacional a solventes orgânicos: uma revisão sistemática. REVISTA BRASILEIRA DE SAÚDE OCUPACIONAL 2016. [DOI: 10.1590/2317-6369000113615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Resumo Introdução: evidências apontam produtos químicos como agentes potencialmente otoneurotóxicos, todavia, ainda não há consenso quanto às associações entre as características das exposições e a ototoxicidade das diversas substâncias químicas presentes em ambientes laborais. Objetivo: revisar a literatura científica disponível, a fim de identificar estudos que apontem evidências de associação, ou não associação, entre dano auditivo e a exposição a solventes orgânicos. Método: revisão sistemática da literatura a partir da consulta a bases de dados eletrônicas, considerando artigos originais, publicados de janeiro de 1987 a fevereiro de 2013. Resultados: trinta e um estudos foram incluídos na revisão sistemática. Discussão: os estudos confirmaram a exposição a determinados solventes como fator de risco para perda auditiva de origem ocupacional, sobretudo na presença do ruído. Foram utilizados métodos variados de avaliação e classificação do desfecho coclear e/ou central, que contribuíram para a compreensão da extensão da perda auditiva induzida quimicamente, bem como com a identificação dos grupos populacionais susceptíveis. Contudo, dados sobre procedimentos diagnósticos adequados, níveis seguros e efeito dose-resposta da exposição química ainda não foram totalmente elucidados.
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Haeffner R, Sarquis LMM, Heck RM, Jardim VMDR. Prevalence of hearing problems and associated factors in an agricultural company in southern Brazil. REVISTA BRASILEIRA DE EPIDEMIOLOGIA 2015; 18:679-90. [PMID: 26247191 DOI: 10.1590/1980-5497201500030013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Accepted: 10/02/2014] [Indexed: 11/21/2022] Open
Abstract
OBJECTIVE To describe the prevalence and to analyze the factors associated with hearing problems in an agricultural company. METHODS This was a cross-sectional study, and the participants consisted entirely of employees of an agricultural company in southern Brazil. The workforce of the company was composed of several different occupations. The research instrument was a semi-structured questionnaire administered by interview. RESULTS Of the 326 workers of the company, there were 273 (83.8%) respondents, and the prevalence of hearing problems was n = 42 (15.4%) among the participants of the study. The hearing problems were associated with lower schooling, with the operating occupational group, the technical assistance group and the general services group. The self-reported health conditions associated with hearing problems were depression and nervousness or irritation. The occupational exposures associated with hearing problems were noise, dust, vibration, oils and solvents, and toxic gases. CONCLUSION There was an intermediate prevalence of hearing problems in relation to other studies. It was possible to observe the need to implement strategies aiming at the prevention of hearing problems that primarily contemplate modifiable aspects, such as the use of personal protective equipment, as well as improvements in the conditions, organization and work environment.
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Affiliation(s)
| | | | - Rita Maria Heck
- Nursing School, Universidade Federal de Pelotas, Pelotas, RS, Brazil
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Abstract
The main hazard for hearing in the workplace is noise. Organic solvents and heavy metals may increase the danger of developing occupational hearing loss, particularly in the case of co-exposure with noise. While noise produces damage predominantly to the cochlea, chemicals may be responsible for pathologic changes in both peripheral and central parts of the auditory pathway. Noise-induced hearing loss develops slowly over the years, although its progression is most dynamic during the first 10-15 years of exposure. Pure-tone audiometry indicates a bilateral sensorineural hearing loss, affecting predominantly high frequencies, with typical notch at 3-6 kHz in the early stages of the disease. Where there is co-exposure to noise and chemicals, the noise effect on hearing threshold shifts is dominant; however chemicals seem to increase the vulnerability of the cochlea to the damage by noise, particularly at its low and moderate levels. According to European Directive 2003/10/EC, the employer is obliged to implement hearing prevention programs when the A-weighted equivalent 8-hour level of noise (LAEX8 hr) exceeds 80 dB. Since chemicals may impair intelligibility of speech despite a lack of audiometric hearing threshold shift, implementation of speech audiometry, particularly speech in noise tests, is recommended in prevention programs.
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Alvarenga KDF, Morata TC, Lopes AC, Feniman MR, Corteletti LCBJ. Brainstem auditory evoked potentials in children with lead exposure. Braz J Otorhinolaryngol 2014; 81:37-43. [PMID: 25458254 PMCID: PMC4557785 DOI: 10.1016/j.bjorl.2013.12.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2013] [Accepted: 12/23/2013] [Indexed: 12/01/2022] Open
Abstract
Introduction Earlier studies have demonstrated an auditory effect of lead exposure in children, but information on the effects of low chronic exposures needs to be further elucidated. Objective To investigate the effect of low chronic exposures of the auditory system in children with a history of low blood lead levels, using an auditory electrophysiological test. Methods Contemporary cross-sectional cohort. Study participants underwent tympanometry, pure tone and speech audiometry, transient evoked otoacoustic emissions, and brainstem auditory evoked potentials, with blood lead monitoring over a period of 35.5 months. The study included 130 children, with ages ranging from 18 months to 14 years, 5 months (mean age 6 years, 8 months ± 3 years, 2 months). Results The mean time-integrated cumulative blood lead index was 12 μg/dL (SD ± 5.7, range: 2.433). All participants had hearing thresholds equal to or below 20 dBHL and normal amplitudes of transient evoked otoacoustic emissions. No association was found between the absolute latencies of waves I, III, and V, the interpeak latencies I–III, III–V, and I–V, and the cumulative lead values. Conclusion No evidence of toxic effects from chronic low lead exposures was observed on the auditory function of children living in a lead contaminated area.
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Affiliation(s)
- Katia de Freitas Alvarenga
- Department of Speech Therapy and Audiology, Faculdade de Odontologia de Bauru, Universidade de São Paulo (FOB-USP), Bauru, SP, Brazil
| | - Thais Catalani Morata
- National Institute for Occupational Safety and Health (NIOSH), Division of Applied Research and Technology, Cincinnati, OH, United States
| | - Andrea Cintra Lopes
- Department of Speech Therapy and Audiology, Faculdade de Odontologia de Bauru, Universidade de São Paulo (FOB-USP), Bauru, SP, Brazil
| | - Mariza Ribeiro Feniman
- Department of Speech Therapy and Audiology, Faculdade de Odontologia de Bauru, Universidade de São Paulo (FOB-USP), Bauru, SP, Brazil
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Juárez-Pérez CA, Torres-Valenzuela A, Haro-García LC, Borja-Aburto VH, Aguilar-Madrid G. Ototoxicity effects of low exposure to solvent mixture among paint manufacturing workers. Int J Audiol 2014; 53:370-6. [DOI: 10.3109/14992027.2014.888597] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Guthrie OW, Xu H, Wong BA, McInturf SM, Reboulet JE, Ortiz PA, Mattie DR. Exposure to low levels of jet-propulsion fuel impairs brainstem encoding of stimulus intensity. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2014; 77:261-280. [PMID: 24588226 DOI: 10.1080/15287394.2013.862892] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Jet propulsion fuel-8 (JP-8) is a kerosene-based fuel that is used in military jets. The U.S. Armed Services and North Atlantic Treaty Organization countries adopted JP-8 as a standard fuel source and the U.S. military alone consumes more than 2.5 billion gallons annually. Preliminary epidemiologic data suggested that JP-8 may interact with noise to induce hearing loss, and animal studies revealed damage to presynaptic sensory cells in the cochlea. In the current study, Long-Evans rats were divided into four experimental groups: control, noise only, JP-8 only, and JP-8 + noise. A subototoxic level of JP-8 was used alone or in combination with a nondamaging level of noise. Functional and structural assays of the presynaptic sensory cells combined with neurophysiologic studies of the cochlear nerve revealed that peripheral auditory function was not affected by individual exposures and there was no effect when the exposures were combined. However, the central auditory nervous system exhibited impaired brainstem encoding of stimulus intensity. These findings may represent important and major shifts in the theoretical framework that governs current understanding of jet fuel and/or jet fuel + noise-induced ototoxicity. From an epidemiologic perspective, results indicate that jet fuel exposure may exert consequences on auditory function that may be more widespread and insidious than what was previously shown. It is possible that a large population of military personnel who are suffering from the effects of jet fuel exposure may be misidentified because they would exhibit normal hearing thresholds but harbor a "hidden" brainstem dysfunction.
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Affiliation(s)
- O'neil W Guthrie
- a Research Service-151, Loma Linda Veterans Affairs Medical Center , Loma Linda , California , USA
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