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Author: admin | 30.07.2014 | Category: Ringing Of The Ears Treatment

International hearing experts at the XXXII World Congress of Audiology in Brisbane are discussing ways to offset a predicted increase in noise-induced hearing loss and tinnitus through increasing recreational and occupational noise exposure. There are some who suggest that as a response to the prevalent noise, and with new gadgets, more and more people use music from personal players to escape from the environmental noise of the city.
Dr Morata believes the messages hearing health experts should be sending is for people to enjoy music or loud sports events in ways that are safe so their hearing abilities remains healthy.
Outside what can be controlled through occupational health and safety regulations, finding ways to reduce the adverse health effects of increasing environmental noise exposure is a real challenge for hearing health experts, they explain. If you must raise your voice to speak with someone only 3 feet away, you are in high (hazardous) noise. The hair cells can be worn out by long periods of loud sounds (or short blasts of extremely loud sounds). Hearing protectors reduce the wear on the hair cells by blocking noise and reducing it to a safe level, without preventing you from hearing sounds around you. There are four basic types of hearing protection listed below; each offers different advantages and options.
Fit is very important for all types of hearing protectors: no one wants to wear shoes that don't fit well. Custom-molded plugs are made especially for you so are already shaped like your ear (rather than conforming to your ear). Every day, we experience sound in our environment, such as the sounds from television and radio, household appliances, and traffic. Scientists once believed that the pure force of vibrations from loud sounds caused the damage to hair cells. When a person is exposed to loud noise over a long period of time, symptoms of NIHL will increase gradually.
Although being aware of decibel levels is an important factor in protecting one’s hearing, distance from the source of the sound and duration of exposure to the sound are equally important. Exposure to harmful sounds causes damage to the hair cells as well as the auditory, or hearing, nerve. Continuous exposure to loud noise also can damage the structure of hair cells, resulting in hearing loss and tinnitus, although the process occurs more gradually than for impulse noise.
People of all ages, including children, teens, young adults, and older people, can develop NIHL. Block noise by wearing earplugs or other hearing protective devices when involved in a loud activity (special earplugs and earmuffs are available at hardware and sporting goods stores).
If you suspect hearing loss, have a medical examination by an otolaryngologist (a physician who specializes in diseases of the ears, nose, throat, head, and neck) and a hearing test by an audiologist (a health professional trained to measure and help individuals deal with hearing loss). The National Institute on Deafness and Other Communication Disorders (NIDCD) researches the causes, diagnosis, treatment, and prevention of hearing loss. NIDCD researchers also are investigating a potential way to prevent NIHL after noise exposure.
NIDCD maintains a directory of organizations that can answer questions and provide printed or electronic information on NIHL. Hearing Protection FAQThis section answers the questions we regularly receive about our in ear hearing protection systems (Serenity, Primero DPC+, Silemo Mini) and our SafetyMeter fit testing system. The amount or degree of attenuation is most often expressed using units called decibels (dBs). The problem is simple: once destroyed, the microscopic hair cells of the inner ear do not grow back. A useful rule of thumb is this: if you have to shout, or have difficulty being understood by someone just 2 meters away, then the sound level is approximately 80 dB. If the same problem occurs at a distance of just 1 meter, the noise level is around 90 dB.
To learn more about decibel noise levels, click here (image opens in new window).What is the best type of hearing protection for staff with an existing hearing loss?Phonak's research has discovered that users with an existing hearing loss benefit most from using 'dynamic' (level-dependent) hearing protection. When an active system’s built-in miniature microphones detect noise levels reaching dangerous levels - including very short ‘impulse’ noises such as gun shots or crashes - these sounds are instantaneously reduced to a comfortable, safe level.

Clinical nylon is biocompatible, highly resistant to mechanical, chemical and thermal stresses, and extremely lightweight (weighing approximately one third of the weight of acrylic or silicone). The amount of attenuation two users receive from their identical protection systems can be different. Individuals involved in the fitting process and receiving positive feedback on the proper fit of their ear protection will be more likely to have a positive attitude about protecting their hearing and will be more apt to use this protection correctly and consistently. A more consistent and accurate attenuation value is obtained with an objective measurement such as F-MIRE, which involves a dual-microphone real ear measurement of a test signal. The system's objective fit verification protects both employee and employer better through being able to reliably predict HPD performance in real world situations. NE-202 Active Electronics Hearing Protector Used in noise surroundings , Shooting, hunting ans so on. Our factory, Nimax (Fuyang) Industrial Corp.is a professional manufacturing company specialized in headphones and hearing protector. Morata, PhD (US National Institute for Occupational Safety and Health, from the Centers for Disease Control and Prevention) said our increase in noise exposure is caused by the world undergoing the fastest phase of growth and urbanization in human history. Below are links to sample audiograms showing one example of a normal audiogram, as well as an example of an audiogram demonstrating hearing loss from noise exposure. The tiny hair cells lining the cochlea respond to vibrations (amplified by the ear drum and the middle ear bones) and send signals to the brain, alerting us to sounds. With all of these choices, you need to try different types until you find one that feels comfortable, properly blocks out noise, and works for your activities.
Instead, recent studies have shown that exposure to harmful noise triggers the formation of molecules inside the ear that can damage or kill hair cells.
Over time, the sounds a person hears may become distorted or muffled, and it may be difficult for the person to understand speech.
For example, the humming of a refrigerator is 40 decibels, normal conversation is approximately 60 decibels, and city traffic noise can be 85 decibels.
If a person regains hearing, the temporary hearing loss is called a temporary threshold shift. All individuals should understand the hazards of noise and how to practice good hearing health in everyday life. Listening to an mp3 device at maximum volume (usually around 105 decibels) for more than 15 minutes per day may cause a permanent hearing loss.
Most hearing loss is caused by damaged hair cells, which do not grow back in humans and other mammals.
Noise exposure triggers the formation of destructive molecules, called free radicals that cause hair cell death. With this approach a user's communication is enhanced, which in turn should lead to better compliance. This makes passive protection systems a great fit for people who work or play in continual loud noise. Clinical nylon is also used extensively in the medical device industry.Can having a hard material such as nylon in the ear cause headaches and pressure build-up?No, because each eShell mold is custom-made to fit the individual’s ear and manufactured with perfect accuracy. It controls and documents the actual protection (‘attenuation’ or sound reduction) the hearing protection device applies. This positive outcome should result in reduced noise-induced hearing loss in the workplace.Who should use fit testing systems?Fit testing is for everyone. In some situations HPDs that are currently in use are only verifiable with a subjective test (these are less accurate as they require employees to respond to sound stimuli, similar to an audiogram). Re-usable test probes also eliminate the need for consumables, which can add significantly to ongoing fit testing costs with other systems.Why is it important to test hearing protection devices?When a user receives new custom hearing protection it is important to check that their in-ear shells (in this case Serenity eShells) have been produced using an accurate impression and are therefore providing the attenuation (sound reduction) required. We have 25 years' experience of researching and producing for headphones and hearing protector.
Then the cells lay over like wet grass, demonstrating a fairly long exposure to loud sound. Someone with NIHL may not even be aware of the loss, but it can be detected with a hearing test.

Sources of noise that can cause NIHL include motorcycles, firecrackers, and small firearms, all emitting sounds from 120 to 150 decibels.
The temporary threshold shift largely disappears 16 to 48 hours after exposure to loud noise. NIDCD-supported researchers have helped to identify some of the many genes important for ear development and hearing.
Researchers initially had thought that antioxidants, chemicals that protect against cell damage from free radicals, might prevent NIHL only if the antioxidants were given before noise exposure.
The consequence is permanent hearing loss and a highly frustrating ringing in the ears (tinnitus). It is a common misperception that you need to wear something that covers all the ears to receive effective protection against noise. As a result, it feels and behaves in a completely natural way in the ear.How long can Serenity hearing protection devices be used before they must be replaced?Serenity in-ear hearing protection devices are particularly resistant to mechanical and chemical stresses and can be used for between 3 and 5 years. When a user receives any type of new hearing protection it is important to check that it performs properly and the user understands how to use it fully. In some cases over 10% of ear molds have to be remade before a proper fit and attenuation performance is achieved.How should you select a fit testing system?To date, field fit-test methods for use with hearing protectors include subjective real-ear attenuation at threshold (REAT) measurements, objective field microphone-in-real-ear (F-MIRE) measures and loudness balance technologies, to obtain a personal attenuation rating (PAR). It is designed specifically to control and document the actual protection (‘attenuation’) a Phonak Serenity user receives. Testing can be performed in any quiet environment, such as a manager’s office or meeting room. Because the exposure is so long (relatively), the cells do not bounce back to their normal position, but instead become damaged. Hearing loss and tinnitus may be experienced in one or both ears, and tinnitus may continue constantly or occasionally throughout a lifetime. You can prevent NIHL from both impulse and continuous noise by regularly using hearing protectors such as earplugs or earmuffs. Recreational activities that can put someone at risk for NIHL include target shooting and hunting, snowmobile riding, woodworking and other hobbies, playing in a band, and attending rock concerts. In a recent study, however, the antioxidants in salicylate (aspirin) and Trolox (vitamin E) were given to guinea pigs as long as three days after noise exposure and still significantly reduced hearing loss. There is currently no agreed standard for determining how a PAR should be calculated; each fit testing system uses a proprietary calculation to determine the result displayed.
The system is portable, and easy to set up and dismantle.How often should tests be run?Every new fitting should be validated. These results suggest that there is a window of opportunity in which it is possible to rescue hearing from noise trauma.
This experiment is the first successful demonstration of gene therapy that improves hearing in formerly deaf animals.
This ensures that user HPDs work effectively over time, and that the attenuation an employee's system provides has not been compromised in some way (i.e.
This is the type of scientific advance that we hope to harness, in our Hearing Restoration Project, to develop the first genuine cure for hearing loss. However, in the event of a user mentioning a specific problem with their hearing protection, or the user’s body weight changing significantly, a new fit test should be run immediately.What is the PAR?The Personal Attenuation Rating, or PAR, is an ear protection rating that applies to one user and their hearing protection system.
Unlike SNR (Europe) and NRR (US) ratings, this figure does not represent an average figure based on test results from several users wearing a protection product. Instead it is specific to a single user’s product and ears.How should the PAR be used?At the bottom of SafetyMeter’s Personal Attenuation Control Certificate, which is created after each test, the user is given Phonak’s Serenity usage recommendations. These suggestions are not general figures but are very specific to the PAR rating of the individual user’s hearing protection. These figures recommend the user’s maximum recommended exposure to noise (in hours) at different surround noise levels (measured in decibels), when wearing their Serenity in ear hearing protection.

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