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Hearing impairment and risk of Alzheimer’s disease: a meta-analysis of prospective cohort studies

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Abstract

Observational studies suggested an association between hearing impairment and cognitive disorders. However, whether hearing impairment is an independent risk factor or a harbinger of Alzheimer’s disease remains controversial. Our goal was to assess the association between hearing impairment (HI) and the risk of Alzheimer’s disease (AD) by conducting a meta-analysis of prospective cohort studies. We comprehensively searched the PubMed, Embase, Web of Science and Cochrane Library databases on January 19, 2016 to incorporate all the prospective cohort studies meeting the inclusion criteria to perform a systematic review and meta-analysis. Four prospective cohort studies with comparison between hearing impairment and normal hearing were incorporated, with 7461 participants. The outcomes of three studies were the incidence of Alzheimer’s disease and the outcome of the fourth study was the incidence of mild cognitive impairment. The overall combined relative risk of people with hearing impairment to develop Alzheimer’s disease was 4.87 (95% CI 0.90–26.35; p = 0.066), compared with the control group. Since both Alzheimer’s disease and mild cognitive impairment are cognitive disorders, we incorporated all the four studies and the overall combined relative risk was 2.82 (95% CI 1.47–5.42; p = 0.002), indicating that the difference was significant. This meta-analysis suggests that hearing impairment significantly increases the risk of cognitive disorders and future well-designed prospective cohort studies are awaited to confirm the association between hearing impairment and risk of Alzheimer’s disease.

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Acknowledgements

This work was supported by Grants to Jun Liu from the National Natural Science Foundation of China (No. 81372919) and we want to thank the authors of the included studies for their original studies.

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Authors and Affiliations

  1. Department of Neurology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, 107 Yanjiang West Road, Guangzhou, China

    Yuqiu Zheng, Shengnuo Fan, Wang Liao, Wenli Fang, Songhua Xiao & Jun Liu

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  1. Yuqiu Zheng
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  2. Shengnuo Fan
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  3. Wang Liao
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  4. Wenli Fang
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  5. Songhua Xiao
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  6. Jun Liu
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Correspondence to Songhua Xiao or Jun Liu.

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Zheng, Y., Fan, S., Liao, W. et al. Hearing impairment and risk of Alzheimer’s disease: a meta-analysis of prospective cohort studies. Neurol Sci 38, 233–239 (2017). https://doi.org/10.1007/s10072-016-2779-3

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  • DOI: https://doi.org/10.1007/s10072-016-2779-3

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