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Evaluation of serum antioxidants in age-related hearing loss

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Abstract

Background

Age-related hearing loss (ARHL) has been linked to the shift in the pro-oxidant/antioxidant ratio. Our objectives were to assess serum levels of retinol and zinc among the elderly individuals and to correlate the levels with hearing threshold.

Methods

Prospective study of apparently healthy individuals aged ≥60 years of age. Participants had complete clinical history, physical examination and pure tone average conducted. Blood samples were collected for determination of serum levels of retinol and zinc. Mann–Whitney U test was used to compare retinol and zinc values. Pearson’s correlation test was used to determine the relationship between hearing threshold and serum levels of retinol and zinc.

Results

Among 126 elderly participants with mean age 67 ± 2.7 years; the mean pure tone average for air conduction was 29.3 ± 1.6 dBHL while the mean bone conduction was 36.5 ± 1.8 dBHL. The median values of serum retinol and zinc levels in the elderly participants who had hearing loss in the speech frequencies were 52 and 83.3 μg/L, respectively, while among participants with normal hearing threshold, values were 50 and 89.9 μg/L, respectively (p = 0.59 and 0.99, respectively). For the high frequencies, the median value of serum retinol and zinc levels among the elderly participants with normal hearing threshold was 70.3 and 99.9 μg/L, while among those with hearing loss, it was 46.9 and 83.2 μg/L, respectively (p = 0.000 and 0.005, respectively).

Conclusion

Serum retinol and zinc levels were significantly lower among elderly with hearing loss involving the high frequencies. This is added evidence to extant literature on the possible role of antioxidants in the development of ARHL and suggests further study on the effect of antioxidants supplementation in the control of ARHL which is presently controversial and inconclusive.

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Acknowledgments

The authors thank Prof. Babatunde L. Salako of the Ibadan-Loyola University Genetics of Hypertension project and Prof. Oye Gureje of the Ibadan Study of Ageing project for their contributions to this work.

Conflict of interest

Authors declare no conflict of interest.

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Correspondence to Taye Jemilat Lasisi.

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Lasisi, T.J., Lasisi, A.O. Evaluation of serum antioxidants in age-related hearing loss. Aging Clin Exp Res 27, 265–269 (2015). https://doi.org/10.1007/s40520-014-0282-3

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