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Friday 13 January 2012

Causes and types of hearing

Many hearing impaired people want to know the cause of their problem. Hearing impairment can have different causes and not always with certainty to determine the cause of poor hearing is. The most common audiological terminology based on a determination of the place or places in the auditory chain, which is the weak link. We are talking about sensorineural, conductive and mixed hearing losses.

Perceptive loss occurs when the problem occurs in the cochlea (cochlear hearing loss), for example damage to the (outer and / or inner) hair cells. The problem may also do so in the auditory nervous system. Sensorineural losses are permanent. Only offer hearing aids in most cases outcome.

Conduction loss is something wrong with the mechanical transmission of the sound enters the ear. This allows the sound to the cochlea or only partially achieved. At each place where the sound is converted into a mechanical movement can go wrong. Currently most conduction losses by the ENT doctor almost perfectly resolved through surgery or medication. Also hearing - if there is no contraindication is - do always excellent.

In a mixed hearing loss, there are problems in both the cochlea and in the transfer of sounds.
Hearing Losses occur both in one ear and two ears. Unilateral hearing loss is called a monaural loss. In hearing loss in both ears, we speak of double sided or bilateral hearing loss. In almost 80% of the tests in people with hearing impairments found bilateral hearing loss back. That is why ear correction in most cases, fitted with two hearing aids or PCAs.
When there is a bilateral loss, so in both ears, this loss in both ears equal or even different for each ear. If the loss in one ear equal to that of the other ear, called a symmetric loss. Hearing loss is different between the two ears, we call this an asymmetrical loss.

Hearing Loss, we can categorize the severity of hearing loss with a tonal or a speech audiogram (see figure).

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