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[ John-John ] [ Hearing Loss ] [
Tour Cebu, PI ]
[ Types of Loss ] [ 4
basic types ] [ How they Work ] [ 10 Myths ] [
Types of Hearing Loss...
There are two
basic types of hearing loss, ones called CONDUCTIVE losses and ones
known as SENSORI-NEURAL losses. Conductive losses are ones which
occur in the outer and middle ear and interfere with the sound being
conducted' to the inner ear.
Blockage of the outer ear can
cause loss of hearing. A common problem in the outer ear canal is
the build up of wax. Wax, called cerumen' (pronounced
"sir-roo-men") is secreted in the outer ear. It is sticky
(to catch airborne particle such as dust), slightly germicidal (to
kill, or at least damage, germs) and has an unpleasant odor (which
is why most bugs which fly by the ear don't go in). Normally it
dries into particles that fall from the ear. In some persons,
however, the cerumen glands are very active, producing more than is
needed. If not cleaned regularly, the wax can accumulate and
eventually block sound from reaching the ear drum. This type of
problem is easily corrected by removing the wax. There are kits
available at pharmacies to prevent wax build-up. This is
recommended, because the removal of wax by a professional, while
safe, can be very painful.
Another conductive loss is when
there is a disruption of the eardrum or bones of the middle ear.
Remember that the middle ear results in a mechanical advantage which
helps sound coming through the air cause the fluid in the inner ear
to move. Any malfunction of the middle ear can cause a hearing loss.
The most common middle ear problems results from a build up of fluid
in the middle ear. Fluid is secreted by cells in the middle ear teo
lubricate the mechanism. As fluid builds up, it is drained by
opening the Eustachian tube, a tube which opens to the throat. The
Eustachian tube is normally opened by activities such as swallowing,
yawning, and chewing. An inflammation of the tube may keep it
closed, and thus fluid builds in the middle ear. This is usually a
problem that can be corrected. It is often the result of an upper
respiratory infection and can be cleared with treatment.
Sensori-neural losses are losses
that occur because of damage to the inner ear or the neural pathways
from the inner ear to the brain. Damage to the inner ear is called
sensory hearing loss and can be caused by many things. It can be the
result of trauma, such as a head injury. It can occur as a result of
an infection that reaches the inner ear. The inner ear can be
damaged by excessive noise, one of the more common causes. And the
inner ear normally deteriorates with age, so almost everyone past
the age of 65 will experience some sensory hearing loss. There is
usually no treatment which can restore the inner ear.
Hearing loss can also be the
result of damage to the nervous system through which neural impulses
generated by the inner ear pass on their way to the brain . The most
common cause of this type of loss is a tumor which pinches the
nerve. If found in the early stages, most of these can be treated.