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Sensorineural hearing loss occurs when there is damage to the inner ear (cochlea) or the hearing nerve. A comprehensive hearing evaluation is necessary to differentiate between types of hearing loss and appropriate treatment options. Some hearing loss causes include damage to the inner ear, a buildup of earwax, infections and a ruptured eardrum. Hearing occurs when sound waves reach the structures inside your ear, where the sound wave vibrations are converted into nerve signals that your brain recognizes as sound. Attached to nerve cells in the cochlea are thousands of tiny hairs that help translate sound vibrations into electrical signals that are transmitted to your brain. Damage to the inner ear. Aging and prolonged exposure to loud noise may cause wear and tear on the hairs or nerve cells in the cochlea that send sound signals to the brain. A gradual buildup of earwax. Earwax can block the ear canal and prevent conduction of sound waves.

Ear infection and abnormal bone growths or tumors. In the outer or middle ear, any of these can cause hearing loss.
Ruptured eardrum (tympanic membrane perforation). Loud blasts of noise, sudden changes in pressure, poking your eardrum with an object and infection can cause your eardrum to rupture and affect your hearing. This is sometimes referred to as nerve deafness, but the medical term is sensorineural hearing loss.
For more information on the evaluation procedure, please see the Basic Hearing Test section under the Hearing Evaluation tab.
The vibrations of different sounds affect these tiny hairs in different ways, causing the nerve cells to send different signals to your brain. When these hairs or nerve cells are damaged or missing, electrical signals aren’t transmitted as efficiently, and hearing loss occurs. The eardrum and three small bones of the middle ear — the hammer, anvil and stirrup — amplify the vibrations as they travel to the inner ear.

When surgery of medication are not helpful, the hearing loss can often be improved with hearing aids. Hearing aids and other assistive hearing technologies can often help this type of hearing loss.
There, the vibrations pass through fluid in the cochlea, a snail-shaped structure in the inner ear.

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14.11.2013 admin

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