Noise Induced Hearing Loss and Its Prevention (cont.)
James K. Bredenkamp, MD, FACS
Dr. Bredenkamp recieved his medical degree from the University of California, San Francisco School of Medicine. He then went on to serve a six year residency at the University of California, Los Angeles School of Medicine in the department of Surgery.
Melissa Conrad Stöppler, MD
Melissa Conrad Stöppler, MD, is a U.S. board-certified Anatomic Pathologist with subspecialty training in the fields of Experimental and Molecular Pathology. Dr. Stöppler's educational background includes a BA with Highest Distinction from the University of Virginia and an MD from the University of North Carolina. She completed residency training in Anatomic Pathology at Georgetown University followed by subspecialty fellowship training in molecular diagnostics and experimental pathology.
In this Article
- What is the importance of noise-induced hearing loss?
- What are acoustic trauma and noise-induced hearing loss?
- How can a person tell if a noisy situation is dangerous to their hearing?
- How loud can a sound get before it affects hearing?
- Do the duration and closeness of exposure to loud noise relate to hearing damage?
- What factors increase a person's susceptibility to noise-induced hearing loss?
- How else can noise affect a person?
- What are the regulations regarding on-the-job exposure to noise?
- How effective are hearing protection devices?
- What are the common problems with hearing protectors?
- Do hearing protectors prevent a person from communicating with others?
- How is hearing loss identified?
- What can be done to treat hearing loss?
- Find a local Ear, Nose, & Throat Doctor in your town
How is hearing loss identified?
Hearing loss usually develops over a period of several years. Since the hearing loss is painless and gradual, many people may not notice it. What someone may notice is tinnitus, which is a ringing or another sound in the ear. The tinnitus could be the result of long-term exposure to noise that has damaged the hearing nerve. Or, a person may have trouble understanding what people are saying or may hear everyone as mumbling. Such hearing difficulties are especially apt to occur when one is trying to hear in a noisy place such as in crowd or at a party. These difficulties could be the beginning of high-frequency hearing loss.
A typical hearing test (audiogram) of a person with noise induced hearing loss will initially show only a high frequency loss at 4000 Hz. (Hertz or Hz is the measure of sound frequency or pitch. Four thousand Hz is high frequency, while 250 or 500 Hz would be low frequency). With continued noise exposure and hearing loss, the audiogram will show a broader loss to include lower (deeper)frequencies.
Noise-induced hearing loss will almost always affect both ears equally, but in some situations, especially with firearm usage, it may be worse in one ear than in the other. For example, firing a rifle tends to injure the ear opposite the side of the trigger finger due to the shadow (blocking the sound) effect of the shooter's head.
What can be done to treat hearing loss?
If a person has any of these symptoms that suggest hearing loss, he or she should consult a physician with special training in ear and hearing disorders(an otolaryngologist or otologist). This type of doctor can diagnose hearing problems and recommend the best way to manage them.
While there is no cure for noise-induced hearing loss, there is some promising research being done. The National Institute on Deafness and Other Communication Disorders (NIDCD) is looking at the use of antioxidants to prevent hearing loss and restore hearing. NIDCD-funded researchers have shown that aspirin and vitamin E can reduce hearing loss if used before exposure to loud noise.
Researchers at the University of Michigan used vitamins A, C, E and magnesium prior to loud noise exposure to prevent hearing loss in animal studies. Studies on people are in progress.
For examples of sounds measured in dBs, The American Academy of Otolaryngology-Head and Neck Surgery provides an Interactive Loudness Scale.
Medically reviewed by Rambod Rouhbakhsh, M.D., MBA, FAAFP; American Board of Family Medicine
Previous contributing editor: Leslie J. Schoenfield, MD, PhD
American Academy of Otolaryngology-Head and Neck Surgery
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