Lower Risk Of Depression, Dementia After Getting Hearing Aids

Lower Risk Of Depression, Dementia After Getting Hearing Aids

Older adults who get hearing aids for a newly diagnosed hearing loss have a lower risk of being diagnosed with dementia, depression, or anxiety for the first time over the next three years.

Getting a hearing aid is also linked to a lower risk of suffering fall-related injuries than those who leave their hearing loss uncorrected, a new study finds.

Yet only 12% of those who have a formal diagnosis of hearing loss actually get the devices—even when they have insurance coverage for at least part of the cost—the study shows. It also reveals gaps in hearing aid use among people of different racial and ethnic backgrounds, geographic locations, and genders.

The study, which uses data from nearly 115,000 people over age 66 with hearing loss and insurance coverage through a Medicare HMO between 2008 and 2016, appears in the Journal of the American Geriatrics Society.

Unlike traditional Medicare, Medicare HMOs typically cover some hearing aid costs for members diagnosed with hearing loss by an audiologist.

The study confirms what other studies have shown among patients studied at a single point in time, but the new findings show differences emerging as time goes on, according to Elham Mahmoudi, a health economist in the department of family medicine at the University of Michigan who led the study.

“We already know that people with hearing loss have more adverse health events, and more co-existing conditions, but this study allows us to see the effects of an intervention and look for associations between hearing aids and health outcomes,” she says.

“Though hearing aids can’t be said to prevent these conditions, a delay in the onset of dementia, depression, and anxiety, and the risk of serious falls, could be significant both for the patient and for the costs to the Medicare system.”

Long-term tracking

Mahmoudi and her colleagues at the University of Michigan Institute for Healthcare Policy and Innovation looked at anonymous insurance data to perform the study, and looked at the data for each person with hearing loss one year before their diagnosis, and three years after, so they could see only newly diagnosed dementia, depression, anxiety, and fall injuries.

They intend to keep studying further data from this population, to see if the differences in health outcomes continue beyond three years.

The study shows that men with hearing loss were more likely to receive a hearing aid—13.3% compared with 11.3% of women. Only 6.5% of people of Latino heritage received a hearing aid for their hearing loss, compared with 9.8% of African-Americans and 13.6% of whites.

Nearly 37% of people with hearing loss who lived in the north-central part of the country, as designated by the Census Bureau, used a hearing aid, compared with just 5.9% of people in the mountain states.

Differences in diagnosis

When the researchers looked at the path that patients who received hearing aids took over three years, compared with those who didn’t get the devices, significant differences emerged.

In all, the relative risk of being diagnosed with dementia, including Alzheimer’s disease, within three years of a hearing loss diagnosis was 18% lower for hearing aid users. The risk of being diagnosed with depression or anxiety by the end of three years was 11% lower for hearing aid users, and the risk of being treated for fall-related injuries was 13% lower.

The study also confirms previous studies’ findings that people with hearing loss had much higher rates of dementia, depression, and fall injuries than the general population.

The reasons for this are complicated, and can include loss of social interaction, loss of independence, loss of balance, and less stimulation to the brain. Some researchers also believe that the loss of nerve impulses from the ear to the brain, and loss of cognitive ability leading to dementia, could be part of the same aging process.

What’s to come

The study only included individuals who billed their insurance company for part of the cost of their hearing aid, Mahmoudi notes. The coming of FDA-approved over-the-counter hearing aids in 2020 for people with mild to moderate hearing loss could make the devices much more accessible for many people.

But those new devices could also complicate researchers’ ability to study the effects of hearing aids on other health outcomes, if people do not use insurance coverage and researchers can’t tell if they have one.

“Correcting hearing loss is an intervention that has evidence behind it, and we hope our research will help clinicians and people with hearing loss understand the potential association between getting a hearing aid and other aspects of their health,” says Mahmoudi.

Source: University of Michigan


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