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<h4>Background</h4> 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.<h4>Objective</h4> To assess the combined effect of solvents and noise versus solvents only, or noise only, on the auditory function of workers.<h4>Method</h4> 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.<h4>Results</h4> 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).<h4>Conclusion</h4> 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.

Original publication

DOI

10.4102/sajcd.v66i1.568

Type

Journal

The South African journal of communication disorders = Die Suid-Afrikaanse tydskrif vir Kommunikasieafwykings

Publication Date

09/05/2019

Volume

66

Pages

e1 - e11

Addresses

Discipline of Audiology, School of Health Sciences, University of KwaZulu-Natal, Durban. tima.nakhooda@gmail.com.

Keywords

Humans, Hearing Loss, Occupational Diseases, Solvents, Hearing, Noise, Occupational Exposure, Adolescent, Adult, Aged, Middle Aged, Young Adult