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How does noise cause hearing loss? – Part 2

• The U .S. Department of Labor’s Occupational Safety and Health Administration ( OSHA ) claims that contact with 85 dB( A ) of noise , referred to as an exposure action value for longer than 8 hrs in a day can lead to permanent hearing loss.
• Since decibels are determined by a logarithmic scale, any increase of three decibels SPL leads to a doubling of strength, which means hearing loss can happen at a faster rate.
• Consequently, gradually developing NIHL arises from the mixture of sound intensity and also length of exposure.
• Both NIHL is attributable to acoustic trauma and gradually developing NIHL can be frequently characterized by a particular pattern shown in audio logical findings.
• NIHL is usually observed to influence a person’s hearing level of sensitivity in the higher frequencies, particularly at 4000 Hz.
• “Noise-induced impairments usually are connected with a notch-shaped high-frequency sensorineural loss which is most horrible at 4000 Hz, even though the notch usually occurs at 3000 or 6000 Hz, as well”.
• Doctoral students at the University of Iowa have referred to this notch, particular to a noise-induced etiology, a “muna.”
• The signs and symptoms of NIHL are generally shown equally in both ears.
• Certainly not all audiological results from patients with NIHL match up the above explanation.
• Usually, a decrease in hearing sensitivity will certainly arise at frequencies other than at the standard 3000–6000 Hz range.
• Differences arise from variations in people’s ear canal resonance, the frequency of the destructive acoustic signal, and length of direct exposure.
• As destructive noise exposure persists, the generally affected frequencies can broaden and become worse in severity.
• “NIHL generally arises at first at high frequencies like 3 , 4 , or 6 kHz, thereafter advances to the low frequencies like 0 .5 , 1 , or 2 kHz.

Prevention of Noise-induced hearing loss

• NIHL can simply be avoided through the use of one of the most simple, widely available and efficient tools.
• This includes but is not confined to ear protection (i .e. earplugs and also earmuffs), education, and hearing conservation programs.
• Earplugs and also earmuffs provide the individual with a minimum of 5 to 10 dB of attenuation.
• The following occupations are most prone to hearing loss:
– Agriculture
– Mining
– Construction
– Manufacturing
– Utilities
– Transportation
– Military
– Musicians

Management of Noise-induced hearing loss

• For individuals living with NIHL, there are various management choices which could improve the capability to hear and successfully communicate.
• Management programs for those who have NIHL include therapy and the using of hearing aids and FM systems.
• With appropriate amplification and counseling, the prognosis is very useful for those who have NIHL.
• The prognosis has advanced with the latest improvements in digital hearing aid technology.
These are like:
– Directional microphones
– Open-fit hearing aids
– sophisticated algorithms
• Yearly audiological evaluations are suggested to monitor any specific changes in a patient’s hearing and to adjust hearing-aid prescriptions.
• There is indication that hearing loss could be decreased by using megadoses of magnesium for a couple days, beginning as quickly as possible after exposure to the loud noise.
• A magnesium-high food plan also appears to be helpful as an NIHL-preventative if consumed in the begining of exposure to loud noises.
• Consuming considerable quantities of magnesium might be potentially harmful; hence this treatment must be implemented with caution.
• There are at present no medical alternatives for NIHL from noise-exposure which occurred above a week earlier.
• However, present study for the possible consumption of drug and genetic therapies appear hopeful.

Noise-Induced Hearing Loss Etymotic Research ER20 ETY-Plugs Noise-Induced Hearing Loss in Youth Caused by Leisure Noise

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