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Presbyacusis (Hearing Loss of Older People)

presbyacusis


Most people over the age of 60 develop some hearing loss. The severity can vary greatly from person to person. Hearing aids and equipment to help when you have hearing loss can make a big difference to your quality of life

What is the ear like and how do we hear?

The ear is divided into three parts - the outer, middle, and inner ear. Sound waves come into the outer (external) ear and hit the eardrum, causing it to vibrate. Behind the eardrum, in the middle ear, are three tiny bones (ossicles) - the malleus, incus, and stapes (also known as the hammer, anvil and stirrup). The vibrations pass from the eardrum to these middle-ear bones. The bones then transmit the vibrations to the cochlea in the inner ear. The cochlea converts the vibrations to sound signals which are sent down the the ear nerve to the brain and allow us to hear.

What is presbyacusis?

Presbyacusis (sometimes written presbycusis) is the medical term for hearing loss that occurs in older people as they age. It is the most common cause for hearing loss in people aged over 55. (Less common causes of hearing loss in older people include infections and injury to the inner ear.)

The hearing loss comes on gradually, often over several years. Both ears are usually affected equally. It is usually high-frequency (high-pitched) sounds that are most affected. For example, you may find it difficult to hear the telephone ringing or birds singing. You may not be aware of your hearing loss at first. You may only realise that your hearing is becoming poor when you have difficulty using the telephone or following a conversation in a group or noisy room. Friends or family may comment about the television being loud or having to repeat themselves more often to people with hearing loss.

Why does it happen?

Most people will tend to lose some of their hearing to a greater or lesser extent as they become older. Over half of people over the age of 60 have some degree of hearing loss. The exact cause of presbyacusis is not known. The inner ear (cochlea) contains nerve cells that convert sound into nervous impulses which are sent to the brain. It is thought that most people develop presbyacusis because these nerve cells don't seem to work as well and they become damaged.

It is probably a number of different things that contribute to this damage and it seems to be part of the ageing process. A number of things have been suggested as possible causes for the damage:

  • Arteriosclerosis - hardening and narrowing of the blood vessels that supply blood to the cochlea, which means that less blood gets through. You may also have heart disease, high blood pressure or diabetes.
  • Exposure to noise over the years.
  • Exposure to stress over the years.
  • Exposure to certain types of medication or chemicals over the years.
  • Smoking.
  • Being overweight.
  • There may also be some hereditary (inherited) reasons for presbyacusis.

When a sufficient number of nerve cells are damaged, this is when you notice hearing loss. Most people do not go completely deaf. The severity of the hearing loss varies from person to person of the same age.

How can it be prevented?

There is little that can be done to prevent this age-related process. It is likely that being exposed to a lot of loud noise over long periods may make hearing loss worse when you are older. For example, if you work in a noisy factory, you should wear ear protection. It is also advisable to avoid excessive noise during leisure time (such as listening to loud music for long periods).

Plugs of earwax may make any hearing loss worse. Therefore, from time to time it may be worthwhile having your ears checked for wax. Wax can usually be cleared out to allow the hearing to be as good as possible.

What investigations are required?

Your doctor may suggest that they examine your ear to look for any problems such as earwax or problems with your eardrum that may be contributing to your hearing loss. Your doctor may also refer you to an audiology clinic or ear, nose and throat (ENT) unit for assessment. A hearing test is performed to confirm the diagnosis and assess your level of hearing loss.

How is presbyacusis treated?

When there is a mild degree of hearing loss, most people manage well in normal situations of everyday life and may not need any treatment. Asking people to speak more clearly may be all that is required.

However, eventually, you may need a hearing aid. A mould of the outer ear is made if a hearing aid is prescribed. Generally it is worn behind the ear and is not very noticeable.

Will my hearing go back to normal with a hearing aid?

Although modern hearing aids are excellent (they are much better in quality and also a lot smaller than they used to be), they cannot make hearing fully normal.
It must be stressed that it takes time to get used to a hearing aid. You have to get accustomed to the amplified sound - it can seem as if background noise is amplified too much. People sometimes give up on their hearing aid too soon, and it is common for hearing aids to be under-used. In time, most people can get used to hearing aids, and find them of great benefit. It is important that hearing aid users be fully instructed on how to use and look after their aid.

What alternatives tare there for hearing aids?
Lip-reading can be helpful. Many people with hearing loss instinctively lip-read to some extent to help understand speech. In addition, lip-reading can be formally taught and learned .
There are a variety of devices which can help if you have hearing loss (whether you use a hearing aid or not). These are sometimes called hearing assistive devices. They include:

  • Telephone amplifiers for ordinary telephones.
  • Specially designed telephones for people with hearing loss.
  • Devices to let you know when your telephone or doorbell is ringing.
  • Lights and devices to let you know when smoke detectors, alarm clocks, etc, are activated.
  • Equipment to help you listen to the TV, radio, stereo, etc.
  • Some people find it helpful to have a hearing dog (the hearing equivalent of guide dogs).

Cochlear implants

If you have severe hearing loss, sometimes a hearing aid may not be enough to help improve your hearing. Or, you may have worn a hearing aid for a number of years but, because your hearing continues to worsen, the hearing aid may no longer be effective. Your doctor may suggest that you consider having a cochlear implant. This is an electronic device that is used to help people with severe hearing loss. The external part of the device is called an external speech processor. A microphone around the ear picks up sounds. These sounds are then converted into electrical signals. These signals are transmitted through the skin to an internal implant inside the cochlear. This implant allows the hearing nerve to be stimulated despite the fact that the cochlear cells are damaged. The brain picks up signals from the hearing nerve and you hear.

Recent developments

Various new technologies are being researched for people with hearing loss. Two recent developments are the active middle-ear implant and electric acoustic stimulation. At present, they have not been trialed specifically for people with presbyacusis, so it is not clear how helpful (or not) they are for this condition.


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