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When Cognition & Hearing Loss Collide
By Jennifer Bradley, Staff Writer

(Page 1 of 2)

If you find a loved one asking repetitive questions, becoming more confused and forgetful, you may assume they have dementia, but the cause could be hearing loss.

While its not new news, study results reported in the January 2013 Journal of the Medical Association Internal Medicine are confirming what many professionals have believed: that cognitive loss and hearing loss collide on a large scale.

The study, from the John Hopkins University School of Medicine, is the first of its kind and is viewing long-term brain function impacted by hearing loss. When the study began in 2001, the 1,984 participants (in the age range of 75 to 84) were in good health and had no cognitive impairment. Over a period of six years, hearing and brain cognition tests were administered. Study researchers determined that brain ability was in direct correlation to hearing loss. Those who did have hearing loss suffered more substantial cognitive impairment more than three years sooner than others with normal hearing levels.

When the study commenced, 1,162 of the participants had some degree of hearing loss. Sixty-six percent had mild cases, 33 percent moderate and only one percent severe. The standard cognitive tests (Modified Mini-Mental State Exam and Digit Symbol Substitution Test) given periodically over the course of the six-year study found that 609 people developed cognitive issues.

Hearing loss is considered one of the most undertreated conditions in older adults, and this study now shows why caregivers should be even more aware if a loved one is having hearing problems. Dr. Frank Lin headed the research. He is an otologist and epidemiologist, and has spent much time documenting the connection between hearing problems, falls and dementia symptoms.

He found that cognitive diminishment was 41 percent greater in the seniors with hearing problems. Dr. Lin explains that research says the link of cognitive loss and hearing loss can be from social isolation and loneliness, which is a professional established risk for cognitive struggles in the elderly. When its harder to hear and participate, the trend has shown declining invitations and social mingling.
He also reports that the brain may be forced to devote a large amount of energy to processing sound in loved ones with hearing loss. He says that hearing loss means that the inner ear is no longer as good at encoding signals with accuracy. So the brain gets a very garbled message, he adds.

This is only at the expense of the energy needed for memory and thinking. Lin says that in some cases, common, unknown damage can be leading to both the hearing and cognitive losses.

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