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Hearing loss and high blood sugar tied to poor cognition and dementia in elderly: JAMA

Written By : Dr. Kamal Kant Kohli Published On 2020-12-18T11:01:28+05:30  |  Updated On 18 Dec 2020 3:04 PM IST
Hearing loss and high blood sugar tied to poor cognition and dementia in elderly: JAMA
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Diabetes, a major public health problem is a risk factor for Alzheimer's disease (AD) and related dementias. More recently, hearing loss has also been linked to increased risk for AD. However, few studies have investigated the combined relationships between diabetes, hearing loss and cognition.

Researchers at University of California San Diego School of Medicine with colleagues have found that hearing loss and high blood sugar are associated with poor cognitive performance among middle-aged and older Latinos. Hearing impairment may exacerbate the associations between high blood sugar and poorer cognition, particularly for learning and memory among Hispanic or Latino persons.

The new study has been published in the online issue of JAMA Otolaryngology-Head & Neck Surgery.

As part of the Hispanic Community Health Study/Study of Latinos, more than 9,000 middle age and older Latinos (ages 45 to 74 years) underwent hearing examinations, extensive cardiovascular and diabetes testing and cognitive assessments. Participants include Central Americans, Cubans, Dominicans, Mexicans, Puerto Ricans and South Americans residing in the Bronx, NY; Chicago, IL; Miami, FL and San Diego, CA.

Those who displayed hearing loss also included individuals with mild to severe levels of cognitive impairment.

"Initially, we thought that the relationships between hearing loss and cognition would be overshadowed by high cardiovascular disease risk, but this was not the case," said first author Ariana M. Stickel, PhD, a postdoctoral scholar in the Department of Neurosciences at UC San Diego School of Medicine.

"This opens up promising avenues for interventions to reduce Alzheimer's disease risk. Evidence suggests that hearing aid use may be protective against cognitive declines for individuals with hearing loss, yet we also see that fewer than 5 percent of Latinos with hearing loss report using hearing aids. This is something we can change to help prevent cognitive declines, but it is going to take awareness on the part of health care providers and their patients."

The study also found that high cardiovascular disease risk is associated with poorer cognition.

"We were surprised to find that individuals with high blood sugar and otherwise average cardiovascular health are susceptible to poorer learning and memory, but only if they also had hearing loss," said senior author Hector M. González, PhD, professor in the Department of Neurosciences at UC San Diego School of Medicine and a member of the UC San Diego Shiley-Marcos Alzheimer's Disease Research Center.

Impairments in learning and memory occur in the preclinical stages of AD. González said the next step is to investigate what is happening within the brain.

"Is there a particular region or network in the brain that is susceptible to damage from both hearing loss and high blood sugar? Does this overlap with early brain changes due to Alzheimer's disease, and how might it be related to learning and memory," González said.

According to a new report by the Lancet Commission, there would be an 8 percent reduction in dementia prevalence globally if hearing loss alone is eliminated.

"Both hearing loss and diabetes can be modified," said Stickel. "Latinos are projected to have the highest increase in Alzheimer's disease and related dementia cases in the U.S. by 2060. Connecting our findings to public health solutions that work for Latinos can help mitigate the impending public health crisis."

For further reference log on to:

JAMA Otolaryngol Head Neck Surg. Published online December 17, 2020. doi:10.1001/jamaoto.2020.4835



Hearing losshigh blood sugarblood sugarpoor cognitiondementiaHearing loss and high blood sugarjama otolaryngology
Source : JAMA Otolaryngology-Head & Neck Surgery
Dr. Kamal Kant Kohli
Dr. Kamal Kant Kohli

Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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