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Hearing management

28 August 2018

When is surgery an option for hearing loss?

Could going under the knife be the ultimate solution for hearing loss? We weigh in on the options.

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The quality of life of many South Africans of different ages is affected by hearing loss. Although hearing aids offer a solution for many, they're not always equally effective. Wouldn't it be simpler if one could fix hearing problems with surgery?

Only a small percentage eligible

The unfortunate reality is, however, that only a small percentage of people suffering from hearing loss are eligible for surgery. “It depends on the type of hearing loss,” according to a Healthy Hearing article.

There are many reasons for hearing loss. One of the most common causes of deafness is sensorineural hearing loss, which involves the nerves. It is caused by old age, consistent exposure to loud noise, infections, trauma to the head or ears, tumours and even medication. This type of hearing loss is permanent.

Other reasons for hearing loss include disorders of the auditory process, where the brain has trouble processing sounds, conductive hearing loss where the middle or outer structure of the ear has problems transferring sounds to the inner ear, or mixed hearing loss where there is a combination of causes. 

Types of hearing surgery

1. Cochlear implants 

What it is: Cochlear implants are often performed in adults and children with profound sensorineural hearing loss. The implants can restore partial hearing and, unlike a hearing aid, the implant bypasses the damaged part of nerve instead of merely amplifying sound.

How it’s performed: A small electronic device is surgically placed under the skin behind your ear. This device is connected to electrodes which are inserted into the cochlea.

When it is considered: According to the Ear Institute of South Africa, cochlear implants are considered when no hearing aid can restore your sense of hearing. A comprehensive evaluation will be done by a team of experts before the procedure is considered, as it is highly invasive and costly.  

woman with cochlear implant

2. Hearing aid implants

What it is: External hearing aids have developed significantly over the past few decades, but for extended wear an internal implant is often considered.

How it’s performed: One of the most commonly performed hearing aid implants is a bone-anchored implant (BAHA), which entails the stimulation of the cochlea by transmitting sounds through the bone of the skull. 

When it is considered: The BAHA is often reserved for patients with chronic middle ear or outer ear problems or congenital defects of the ear and who can’t benefit from hearing aids. The prerequisite is that the patient should have one ear with moderate hearing.

3. Pressure equalising (PE) tubes 

What it is: This procedure entails the insertion of tubes into the ear to equalise pressure and allow air through in cases where the Eustachian tube (the tube that connects the middle of the ear to the back of the nose) becomes blocked with fluid.

How it’s performed: An incision is made in the eardrums and any fluid drained out. Tiny, hollow metal or plastic tubes are then inserted to allow air through to the middle of the ear, and as the eardrum heals, these get pushed out again. Sometimes long-term tubes are needed, which are surgically removed.

When it is considered: This procedure is often considered for young children suffering from chronic ear infections, but in many cases the surgery is also performed on adults to correct hearing loss linked to malformed eardrums or problematic Eustachian tubes.

hearuing


4. Stapedectomy

What it is: This surgical procedure is often used to treat hearing loss caused by otosclerosis, a condition that causes abnormal bone growth inside the middle ear, which prohibits vibrations to travel through the ear. 

How it's performed: An incision is made behind the ear and muscle or tissue is removed. Excess or abnormal bone (usually referred to as the “hearing bone” or the stapes bone) is fixed. A prosthesis is then inserted and connected to the second hearing bone (the incus) to allow sound waves to travel correctly.

When it's considered: A stapedectomy will be performed when there is a deformity of the stapes bone and a hearing aid is not providing sufficient correction of hearing loss. 

So, surgery or not?

It is likely that medical technology will come up with more non-invasive options to restore hearing loss in the future. But since hearing surgery can currently only restore specific cases of hearing loss when hearing aids are not an option, hearing aids still remain the most effective non-invasive method to help correct hearing. 

Image credit: iStock

 

Ask the Expert

Hearing Expert

Dr Kara Hoffman graduated from UCT in 2004, thereafter she completed her year of community service in Durban. In 2010 she completed her Masters Degree in Paediatric Aural Rehabilitation from UKZN. In 2016, she became a Doctor of Audiology through the University of Arizona (ATSU). Dr Hoffman and her partner Lauren Thompson opened a fully diagnostic audiology practice called Thompson & Hoffman Audiology Inc. In 2011 with world-class technology and equipment to be able to offer the broad public all hearing-related services including hearing testing for adults and babies, vestibular (balance) assessments and rehabilitation, industrial audiology, hearing devices, central auditory processing assessments for school-aged children, school screening, neonatal hearing screening programmes at Alberlito and Parklands Hospital, cochlear implants and other implantable devices, medicolegal assessments and advanced electroacoustic assessments of hearing. Thompson and Hoffman Audiology Inc. are based at Alberlito Hospital in Ballito, St Augustines Hospital in Durban and at 345 Essenwood Road, Musgrave. The practices are all wheelchair friendly. There are three audiologists that practice from Thompson & Hoffman – including Dr Kara Hoffman, Lauren Thompson & Minette Lister. The practice boasts professional, highly qualified, and extensive diagnostic services where all your hearing healthcare needs can be met. The additional licensing in vestibular assessment and rehabilitation, paediatric rehabilitation and cochlear implantation places this practice in one of the top specialist audiological positions in South Africa, with a wealth of experience in all clinical areas of audiology and is a very well respected and sought-after practice.

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