Study finds that hearing aid use is linked to a slower decline in thinking skills.
A new study has found that hearing loss increases the risk of a precursor to dementia called mild cognitive impairment - but this increased risk is not present in people who wear hearing aids.
The study co-funded by Dementias Platform UK (DPUK) investigated the risk of cognitively healthy people developing mild cognitive impairment (MCI). It found that hearing loss increases the risk of MCI but that hearing aid use significantly reduces this risk. MCI is a condition involving thinking and memory problems that are worse than the expected decline with age but not bad enough to disrupt daily life and warrant a diagnosis of dementia. Furthermore, roughly a third of people aged 65 and older have some form of hearing impairment. These figures are so high that The Lancet Commission on Dementia Prevention, Intervention, and Care estimated that untreated hearing loss may account for up to 9% of dementia cases.
Shedding light on this issue is a research team led by Dr Magda Bucholc (Lecturer in Data Analytics at Ulster University) and Dr Sarah Bauermeister (Senior Scientist at DPUK and Oxford University’s Department of Psychiatry). Their latest study, published in the journal Alzheimer’s & Dementia: Translational Research & Clinical Interventions, a journal of the Alzheimer’s Association, is the first to investigate the link between hearing aids, cognitive decline, and progression to MCI in cognitively healthy individuals. The current work builds on the team’s previous paper, which found that people with MCI who wore their hearing aids were less likely to develop dementia. The team found that people with hearing loss were significantly more likely to develop MCI than people with normal hearing. However, people with hearing loss who wore their hearing aids had a significantly reduced risk of MCI.
Dr Bucholc said: ‘Our latest paper demonstrates that hearing aid use is linked to lower rates of cognitive decline and reduced risk of MCI in cognitively healthy adults, with hearing aid users having more than 50% lower risk of MCI compared to those not using hearing aids. Importantly, we found that no significant differences in risk of developing MCI and cognitive decline exist between participants experiencing no hearing loss and those diagnosed with hearing impairment using hearing aids.’ Dr Bauermeister added: ‘Our findings provide compelling evidence supporting hearing aid use, but we now need clinical trials to objectively measure hearing aid use in the context of dementia to establish a causal link. We also encourage other researchers to incorporate hearing aid usage as a confounding factor when analysing changes in cognitive function.’
It is not yet known with certainty why hearing loss is associated with increased dementia risk. Potential explanations include a reduction in people’s ability to engage socially, resulting in higher rates of depression or loneliness, and/or changes to the brain associated with the impact of sensory deprivation. There is also the possibility that hearing problems require greater use of cognitive resources when individuals are engaged in listening.
Dr Bucholc concluded: ‘Our findings imply that the use of hearing aids may help lessen cognitive decline associated with hearing loss. So, improved audiology screening and better access to quality hearing healthcare form an actionable strategy to reduce the incidence of MCI and help mitigate the impending dementia epidemic.’
The RNID’s Associate Director responsible for the charity’s health programme, Crystal Rolfe, said: ‘Our charity wants to encourage people to take better care of their hearing. We welcome these new findings showing how vitally important this is. Building on the team’s earlier research, highlighting how hearing aids may slow the progression of dementia, this observational study’s findings suggest that hearing aids may also slow the development of mild cognitive impairment, which can be a precursor to dementia. Very encouragingly, their results suggest that people who wear their hearing aids are no more likely to develop MCI than people without hearing loss. We echo DPUK’s call for further clinical research to confirm these findings. This latest study and similar research demonstrate the strong benefits of people taking action as early as possible if they have concerns about their hearing, by getting their hearing checked and wearing hearing aids if they need to.’
If you would like a quick hearing check now, our free online hearing test takes just a few minutes, or if you prefer, don't hesitate to get in touch with us to arrange a full hearing assessment in our Taunton hearing clinic.
With thanks to Dementias Platform UK (DPUK) and Alzheimer’s Association.
