Is there a diagnostic test(s) to determine if hearing loss is due to noise
exposure.
Could you provide some good reference sites for this topic. I am also
looking for case examples (civil law cases in N. Am or workers compensation
examples) for claims awarded for noise induced hearing loss. Thankyou
Answer -------------------
There is no simple diagnostic test that conclusively determines noise exposure as a cause for hearing loss. The diagnosis of noise-induced hearing loss relies on a history of noise exposure, typical audiometric findings, and exclusion of other causes of hearing loss. In the case of occupational noise exposure and workmen's compensation law, there should be evidence of many years (> 10-15) of continuous (8 hrs/day) noise exposure (>85 decibels) without hearing protective devices. It is also helpful to have baseline audiograms at the time of hire, as well as serial audiograms annually during employment. Noise surveys in the work place are also helpful. One must ascertain that no other sources of noise outside of employment are involved such as weapons fire (hunting), power tools, etc. The classic audiometric findings in an individual with many years of hazardous noise exposure such as might have occurred in a factory include preservation of low-frequency hearing (typically the frequencies between 500-2000 Hz are relatively unaffected with thresholds at or above 40 decibels acuity) and maximum hearing loss occurring within a relatively narrow band between 3000-6000 Hz(usually the maximum degree of loss is at or above 75 decibels acuity). The hearing loss must be purely neurosensory. The hearing loss due to noise exposure does not progress once the affected individual is removed from a noisy environment and therefore the most accurate reflection of hearing loss that might be due to occupational noise exposure should be determined by the best hearing test results obtained closest to the last actual day of work. Workmen's compensation laws regarding hearing loss vary from state to state with different formulas used to calculate degree of compensability.
--
Steve Dankle, MD
Otolaryngology-Head and Neck Surgery
Milwaukee, Wis
NOTICE: OFCN is not engaged in the rendering of professional medical services. The information contained on this system or any other OFCN system should not supplant individual professional consultation. It is offered exclusively as a community education service. Advice on individual problems must be obtained directly from a professional.
Click here to review
previous Ear, Nose and Throat Clinic consultations