9Hearing Aids and Combination Devices

FHearing loss and tinnitus travel together

Tinnitus and hearing loss are tightly linked: a large majority of people with bothersome tinnitus have some degree of hearing loss, often in the high frequencies that audiometry can miss if only standard tones are tested [2014]. The two share a common origin in the cochlea and the central changes that follow loss of input.

When the cochlea sends less signal upward, the central auditory system turns up its own gain to compensate. This increased central gain is thought to amplify spontaneous neural activity and contribute to tinnitus. Restoring real sound to the deprived pathways is therefore not just about communication — it directly addresses one of the proposed engines of tinnitus [2014].

THow a hearing aid helps tinnitus

A hearing aid helps tinnitus in several overlapping ways. By amplifying everyday environmental sound, it enriches the auditory scene and reduces the contrast between tinnitus and quiet — the same principle as enrichment, but using the world’s own sound. The restored input is also thought to reduce the central gain that drives tinnitus [2014].

Just as importantly, treating the hearing loss reduces listening effort and the strain of struggling to follow conversation. Easier hearing means less fatigue, less frustration and lower emotional reactivity, all of which feed back into how intrusive the tinnitus feels [2015]. For many patients, the communication benefit alone substantially improves quality of life.

TCombination devices: aid plus sound generator

A combination device is a hearing aid with a built-in sound generator, so a single instrument can both amplify the environment and add its own therapeutic sound — broadband noise or fractal tones — in the same ear [2015]. This suits patients who have hearing loss but still hear their tinnitus in quiet, where amplified ambient sound is not always enough, for example in a silent bedroom.

A validation study of a combination hearing-aid-and-tinnitus device confirmed that the added sound-generator function can be reliably fitted and delivered alongside amplification in one instrument [2015]. The convenience of one device, and the ability to use the generator when the room is too quiet for amplification to help, are the main practical advantages.

CFitting strategy

Fitting begins with treating the hearing loss properly: an appropriate prescriptive target, verified gain, and — commonly — open or vented fittings that let low-frequency environmental sound through while amplifying the high frequencies where loss and tinnitus often live [2015]. Getting the amplification right is the priority, because the communication and enrichment benefit flows from it.

If the patient still hears intrusive tinnitus in quiet despite good amplification, the sound-generator feature of a combination device can be added and set at a low, comfortable mixing-point level. As with any sound therapy, the device works best embedded in counselling and realistic expectation-setting rather than fitted in isolation [2010].

CWhat the evidence shows

The evidence base is uneven but supportive at the level of first-line practice. The Cochrane review specifically on amplification with hearing aids for patients with tinnitus and co-existing hearing loss found very limited high-quality trial evidence, underlining how few good randomised studies exist [2014]. Despite that, guidelines recommend hearing aids for tinnitus patients who also have hearing loss because the intervention is safe, addresses a real comorbidity, and improves communication [2014].

For combination devices versus hearing aids alone, the picture is similarly modest: a validated device exists and many patients value the dual function, but there is no strong evidence that adding the generator reliably outperforms a well-fitted hearing aid for everyone [2015]. The reasonable position is to fit the hearing loss first and add a generator selectively, for the patient who still struggles in quiet.