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Noise induced hearing loss thesis

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Radke, MD 5 ; Christa L. Methods: CDC analyzed the most recent available data collected both by questionnaire and audiometric tests of adult participants aged 20—69 years in the — National Health and Nutrition Examination Survey NHANES to determine the presence of audiometric notches indicative of noise-induced hearing loss. Prevalence of both unilateral and bilateral audiometric notches and their association with sociodemographics and self-reported exposure to loud noise were calculated. The prevalence of notches was higher among males. Almost one in four U.
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Vital Signs: Noise-Induced Hearing Loss Among Adults — United States – | MMWR

However, sounds can be harmful when they are too loud — even for a short time — or when they are long-lasting, even if they are not quite as loud. These sounds can damage part of the inner ear and cause permanent hearing loss. This permanent hearing loss can then worsen over a lifetime. Hearing loss from noise can happen to anyone at any age. Analyses from nationally representative health interview and examination surveys found that about one in seven U. To understand how loud noises can damage our hearing, we have to understand how we hear.
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Noise-induced hearing loss

Noise-induced hearing loss NIHL is hearing impairment resulting from exposure to loud sound. People may have a loss of perception of a narrow range of frequencies or impaired perception of sound including sensitivity to sound or ringing in the ears. Hearing may deteriorate gradually from chronic and repeated noise exposure such as to loud music or background noise or suddenly from exposure to impulse noise, which is a short high intensity noise such as a gunshot or airhorn.
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Skip to main content. Rockville, MD. Recent animal studies have revealed substantial irreversible neural degeneration following temporary noise-induced elevation of auditory threshold, i. Despite no hair cell loss and recovery of threshold sensitivity, exposed animals demonstrated extensive loss of synaptic connections between cochlear hair cells and auditory nerve terminals and delayed degeneration of spiral ganglion cells and their central projections Kujawa and Liberman, ; Lin, et al.
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