Hearing loss as a risk factor for dementia: A systematic review

Area of Science:

• Gerontology
• Neuroscience
• Audiology

Background:

• Hearing loss is a common condition in older adults.
• Emerging evidence suggests a potential link between hearing impairment and cognitive decline.
• Understanding this association is crucial for public health initiatives.

Purpose of the Study:

• To systematically review existing evidence on hearing loss as a risk factor for dementia.
• To synthesize findings from studies investigating the relationship between hearing impairment and cognitive decline.

Main Methods:

• A systematic review of the PubMed database was performed.
• Search terms included "hearing loss" OR "presbycusis" AND "dementia" OR "cognitive decline".
• 17 articles meeting inclusion criteria, which evaluated the association between hearing loss and incident dementia or cognitive decline, were analyzed.

Main Results:

• All 17 included studies indicated an association between hearing loss and dementia or cognitive decline.
• Methods for assessing hearing loss and dementia varied, with peripheral auditory function and the Mini Mental State Exam (MMSE) being most common.
• Confounding variables like cardiovascular risk factors were frequently measured, though family history of dementia was less commonly assessed.

Conclusions:

• The reviewed studies consistently demonstrate that hearing loss is associated with an increased incidence of dementia in older adults.
• Despite methodological variations, the collective evidence supports a reliable link between impaired hearing and cognitive impairment.