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Association between swallowing function and oral bacterial flora in independent community-dwelling elderly

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Abstract

Background

Increasing incidences of swallowing dysfunction, or dysphagia, a risk factor for aspiration pneumonia, are being reported in aging populations.

Aims

To investigate the relationship between swallowing function and oral bacteria in independent, community-dwelling elderly.

Methods

This study recruited 139 community-dwelling individuals aged ≥ 70 years with poor swallowing function. The presence of anaerobic (Prevotella spp. and Fusobacterium spp.) and aerobic bacteria was examined in the participants’ oral cavity flora. Swallowing function was evaluated using a 30 mL water swallowing test. Multivariate logistic regression analyses were performed to examine the association between oral bacteria and swallowing function.

Results

Swallowing function was assessed as abnormal in 2.9% and as abnormal in 47.5% of the subjects. The colony-forming units (CFUs/ml) of Prevotella spp. were associated with the swallowing dysfunction (odds ratio [OR] 3.45, 95% confidence interval [CI] 1.49–8.11). Further, CFUs/ml of Fusobacterium spp. and aerobes did not correlate with the swallowing dysfunction but were related with the number of teeth (OR 2.71; 95% CI 1.28–5.74, and OR 0.40; 95% CI, 0.18–0.91, respectively)

Conclusions

Swallowing dysfunction in community-dwelling elderly is associated with increased abundance of Prevotella spp., which indirectly may be an increased risk factor for aspiration pneumonia.

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Authors and Affiliations

Authors

Contributions

YH conceived this study, participated in its design and coordination, performed the statistical analysis, and drafted the manuscript. TN and CT contributed to the statistical analysis and helped draft the manuscript. HS contributed to the conception and design of this study, contributed to the statistical analysis, helped draft the manuscript and supervised the whole study process. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Yoshimi Hida.

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Conflict of interest

The authors declare that they have no conflict of interest.

Statement of human rights

This study was approved by the bioethics committee in Nagoya University Graduate School of Medicine (approval number 13–139) and was performed in accordance with the ethical standards laid down in an appropriate version of the 1964 Declaration of Helsinki.

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All the participants in this study provided written informed consent.

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Hida, Y., Nishida, T., Taniguchi, C. et al. Association between swallowing function and oral bacterial flora in independent community-dwelling elderly. Aging Clin Exp Res 33, 157–163 (2021). https://doi.org/10.1007/s40520-020-01521-3

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  • DOI: https://doi.org/10.1007/s40520-020-01521-3

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