Hearing loss and dementia
Research shows a connection between hearing loss and dementia. A long-term study of more than 2000 older adults also found that cognitive decline was significantly reduced in subjects who used hearing aids.
The 18-year long study included 2,040 adults. Those included in the study were 50 years of age and older, had no dementia at the beginning of the study, and began using hearing aids during the 18-year period. Cognitive function was assessed using a list of short term delayed recall of cards (10 words). The researchers chose assessments that were associated to age-related cognitive abilities, such as episodic memory.
Episodic memory includes a persons recollection of how someone felt at a certain time and place, as well as other specific details related to memory (livescience.com. )
Examples of episodic memory include:
- Your skiing vacation last winter
- The first time you traveled by airplane
- Your first day at a new job
- Attending a relative’s birthday party
- The movie you saw on your first date with your wife/husband
(Kim Ann Zimmermann, Episodic Memory: Definition and Examples, livescience.com)
When evaluating memory within the study, researchers felt that episodic memory was the best measurement.
“The researchers chose to study tasks of episoic memory because they are more age sensitive than other cognitive measures and have a strong association with dementia” – Audiology HealthCare News
Dementia is a major health problem worldwide. A recent study suggested that treating risk factors could prevent or minimize 35% of dementia cases. The strongest of treatable factors is untreated hearing loss.
Dementia and Hearing Aids
On average, participants in the study began using hearing aids at age 62. It was found that episodic memory declined with age, but the rate of decline slowed down significantly after the use of hearing aids. Scores on memory tasks did not stop the decline completely after the use of hearing aids, but the decline did slow down.
Other studies have also found a relationship between untreated hearing loss and cognitive function in older adults. Researchers believe there are two possible causes; that hearing loss and dementia are caused by an age-related decline in the central nervous system, and the decline can be due to auditory deprivation which results from less social engagement and increases in anxiety and depression.
Researchers argue that their findings suggest that auditory deprivation, less social engagement and increases in anxiety and depression could be key.
“Increased access to quality hearing healthcare might delay the onset of cognitive impairment (and help) reduce the impending dementia epidemic” – Longitudental Relationship Between Hearing Aid Use, and Cognitive Function. Maharani, et al. J. American Geriatrics Society, April 2018.
Source: Hearing Health Care News
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