Preventing noise-induced hearing loss

Noise is one of the most common causes of hearing loss in adults. The National Institute of Health estimates that 11 million Americans are exposed to toxic levels of noise in the workplace, while more than 20 million are exposed to possibly damaging noise levels in the community, at home, and in recreation. Perhaps 10 million Americans have hearing loss due to noise exposure.

Approaches to minimizing the effects of noise on hearing sensitivity include efforts to reduce noise at the source, the use of ear protectors (such as earplugs and earmuffs), and regular audiologic monitoring. Some research suggests that another tool may be available soon to help prevent or minimize the effects of noise exposure. Animal studies have investigated the use of antioxidants such as N-acetylcysteine to boost the ear’s defense against damage from noise.

According to an article published in NewsRx.com, noise can overwhelm the inner ear’s natural antioxidants that provide a defense against harmful free radicals (unstable atoms or molecules). An excess of free radicals can damage or destroy the hair cells of the inner ear.

The use of antioxidants to minimize the effects of free radicals has increased significantly in recent years, including the use of vitamin C and vitamin E as sources of antioxidants.

By providing additional antioxidants to the inner ear-either by pill or liquid form, and preferably before exposure-the ear may be able to minimize or prevent the build-up of free radicals. The treatment may even be effective if taken within eight hours post-exposure.

A number of animal studies have yielded encouraging results using a variety of antioxidant compounds, as did at least one study on humans. Additional human studies are underway now, including a study involving 600 Marines at Camp Pendleton, Calif.

— Andrew Waits, Au.D.