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Author: admin | 19.08.2014 | Category: Ringing Of The Ears Treatment

Particular causes of hearing loss will be show up in the clinical audiogram in characteristic ways. Conductive hearing loss comes about when the transmission of sound to the inner ear is impaired, perhaps due to impacted ear wax (cerum), an ear infection (otitis media with effusion or OME), or calcification of the middle ear ossicles (otosclerosis).
It is often possible to treat conductive hearing loss by removing the cause of the physical obstruction. By far the most common cause of sensory neural hearing loss is damage to sensory hair cells in the cochlea.
Because our outer and middle ear transmits frequencies near 4 kHz very efficiently, hair cells that are tuned to frequencies near 4 kHz are particularly vulnerable to noise damage. Even if we avoid exposure to very loud noise, the ear's outer hair cells may also simply wear out as we age, leading to age related hearing loss. Although, it is common for people to have some hearing loss at age 70, hearing loss is not necessarily a given based solely upon age, and there are many elderly people who have no hearing loss. Mixed hearing loss is a mixture of both conductive and sensorineural elements of hearing loss. Tinnitus is a "ringing in the ears" that results from the brain's attempt to fix a hearing loss and is therefore a symptom and not a specific type of hearing loss. Hearing damage has been a battlefield risk ever since the introduction of explosives and artillery, and the U.S.
If you believe you have a hearing problem, then see an Audiologist or a Otolaryngology specialist (ENT doctor). The decrease in auditory acuity seen in conductive hearing loss is caused by pathology of either the outer or middle ear.
In these cases, hearing loss is caused by a mechanical occlusion of the external auditory meatus. What is a 'normal' tympanic membrane?A normal tympanic membrane is thin and transparent, allowing visualisation of the air in the tympanic cavity. Without treatment, persistent ear infections may result in permanent hearing loss or impairment.

There are four common etiological causes for hearing loss: earwax buildup, prolonged exposure to noise or acoustic trauma, aging, and infections.
The most common etiology of hearing impairment in newborns and young children is an infection of the ear.
Conductive hearing loss tends to a loss of sensitivity across the entire range of frequencies, most commonly in one ear only.
In this condition, high frequency outer hair cells tend to die off before low-frequency ones, possibly because the high frequency outer hair cells have to work harder if their job is to amplify acoustic vibrations on a cycle by cycle basis. The most common pathologies are covered in this chapter, but this list is in no means exhaustive.
Acquired hearing loss (generally appears in adults), but has an dominant autosomal genetic component with a variable penetration.
People with a heavy buildup of earwax often experience stifled hearing or irritation inside their ear canal. When hearing is impaired due to damage caused by infections or other medical conditions, it is called sensorineural impairment. Fortunately, these hearing losses are usually only temporary and can often be reduced or eliminated by the appropriate medical intervention.
When hearing loss is detected the thresholds fall into the shaded areas, meaning sounds in this range must be increased in level (amplitude) for you to hear them. Therefore, hearing damage is the most common disability in the war on terror, according to the Department of Veterans Affairs. Particular attention should be paid to piercings in the cartilage as these are a main contributor to chondritis (see picture).
The malleus is less visible and its handle causes a depression at its join with the tympanic membrane. The severity of each etiology of hearing impairment varies, and preventing each from occurring is also dependent on what the actual cause of hearing loss is. Sudden exposure to loud noises, like gunshots or bombs, leads to instantaneous hearing loss in a phenomenon known as acoustic trauma.

The medical condition for this form of hearing loss is called presbycusis and the manner in which hearing is lost is called acquired hearing loss. In fact this case isn't a real perforation as the eardrum is still intact, it has just been sucked in towards the bottom of the tympanic cavity.Cholesteatoma is characterised by an accumulation of squamal cells in the retracted region.
The reversibility of each cause is contingent on how early the cause of hearing impairment is detected and what type it is. When hearing loss is the result of a blockage of this sort, it is called conductive hearing loss.
Unlike the effects of chronic exposure to noise, acoustic trauma is temporary unless the inner ear is damaged. Noise damage or age related hearing loss tends to produce characteristic deficits as shown in the audiograms here below.
A break in the ossicular chain is classic, and it can sometimes affect the inner ear, which is reflected in a mixed hearing loss (reduction in air and bone conduction). Fortunately, this etiology of hearing impairment is easily treated and only affects hearing temporarily. Listening to music at lower decibels and wearing protective earplugs are ways to avoid this problem. Unfortunately, this etiology of hearing impairment is not reversible and is often compounded by one or more of the other causes of hearing loss. If left untreated, however, the infection can alter hearing permanently; chronic ear infections may also have lasting effects on hearing. Unlike conductive hearing loss, which can often be cured, sensory-neural hearing loss is in most cases irreparable, and treatment will aim to make the best use of those auditory structures that remain in tact, perhaps by boosting sensitivity through a hearing aid, or, in severe cases, by trying to bypass dead sensory hair cells with cochlear or brainstem implants.

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