ACHIEVE trial: hearing aids linked to 48% slower cognitive decline in high-risk subgroup of 238

Medical reports summarised by ad-hoc-news.de put age-related hearing loss in focus as a risk factor for cognitive impairment, falls and depression. In the ACHIEVE trial, published in The Lancet in 2023, 977 adults aged 70 to 84 were followed for three years. The primary analysis found no statistically significant effect of hearing aids on overall cognitive course ad-hoc-news.dead-hoc-news.dead-hoc-news.deOpen source ↗.

A prespecified subgroup analysis of 238 people with elevated dementia risk at baseline recorded 48 percent slower cognitive decline among participants who used hearing aids.

Hearing loss and dementia risk

The 2024 Lancet Commission on dementia identifies 14 modifiable risk factors. According to the report, about 45 percent of dementia cases worldwide could in theory be prevented or delayed through preventive measures. Untreated hearing loss is epidemiologically associated with about 7 percent of cases, and relative dementia risk rises by about 16 percent per 10 decibels of hearing loss.

Earlier research from Johns Hopkins University found that mild hearing loss doubles dementia risk compared with normal hearing, moderate loss triples it, and severe loss raises it five-fold ad-hoc-news.dead-hoc-news.dead-hoc-news.deOpen source ↗. Another observational study links hearing loss in midlife to a 71 percent higher relative risk of dementia later on.

Researchers discuss several mechanisms: constant cognitive overload from compensating for missing auditory input, growing social isolation, and degenerative neuronal changes in the brain. Causality is considered complex and has not been conclusively settled methodologically.

Access to hearing care

The World Health Organization lists hearing aids in its 2026 recommendations as one component of dementia prevention. On average, 7 to 10 years pass between the first hearing problems and actual medical intervention.

Globally, an estimated 17 percent of those who could benefit use hearing aids. In Europe and the USA the share is 30 to 40 percent, and it falls sharply in emerging and developing countries ad-hoc-news.dead-hoc-news.dead-hoc-news.deOpen source ↗.

According to WHO, more than 430 million people need rehabilitation for disabling hearing loss, defined as a threshold above 35 decibels in the better ear. More than 25 percent of people over 60 are affected, and nearly 80 percent of those affected live in low- and middle-income countries.

Presbycusis usually begins gradually and affects the higher frequencies first. Speech is still heard but becomes hard to understand in noisy surroundings.