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Chemical-Induced Hearing Loss in Shipyard Workers
Nicholas Cody Schaal1, Jeremy M Slagley, Cynthia McCormick Richburg
1Uniformed Services University, Preventive Medicine and Biostatistics Department, Bethesda, Maryland (Dr Schaal); Indiana University of Pennsylvania, Safety Sciences Department, Indiana, Pennsylvania (Drs Schaal, Slagley, Zreiqat, Paschold); Department of the Air Force, Air Force Institute of Technology, Department of Systems Engineering and Management, Wright-Patterson AFB, Ohio (Dr Slagley); and Indiana University of Pennsylvania, Communication Disorders, Special Education, and Disability Services, Indiana, Pennsylvania (Dr Richburg).
Combined exposure to metals, solvents, and noise significantly damages hearing more than noise alone. Hearing conservation programs must consider these multiple exposures for effective prevention.
Area of Science:
- Occupational Health
- Audiology
- Toxicology
Background:
- Occupational hearing loss is a significant concern in industrial settings.
- Previous research has primarily focused on noise exposure, often overlooking combined chemical and noise risks.
Purpose of the Study:
- To investigate the impact of simultaneous exposure to metals (lead, cadmium, arsenic), solvents (toluene, xylene), and noise on hearing.
- To compare hearing changes in shipyard workers with varying levels of these exposures.
Main Methods:
- A cohort of 1266 shipyard workers was categorized into four groups based on low or high concentrations of metals, solvents, and noise.
- Hearing changes were analyzed between 2004 and 2015.
Main Results:
- The group with high exposure to metals, solvents, and noise exhibited significantly worse hearing changes compared to the reference group (low metals/low solvents/high noise).
- Statistical significance was observed at 1000 Hz (P=0.007) and across broader frequency ranges (2000-4000 Hz, P=0.014; 500-6000 Hz, P=0.014).
Conclusions:
- Simultaneous high-level exposure to metals, solvents, and noise poses a greater risk to hearing than noise exposure alone.
- Effective hearing conservation strategies must integrate assessments of combined chemical and noise exposures, not solely focus on noise reduction.
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