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Neurological Sciences

, Volume 39, Issue 2, pp 321–328 | Cite as

Comparison of olfactory and gustatory disorders in Alzheimer’s disease

  • Minoru Kouzuki
  • Tetsuya Suzuki
  • Masaya Nagano
  • Syouta Nakamura
  • Yuto Katsumata
  • Ayumi Takamura
  • Katsuya Urakami
Original Article
  • 307 Downloads

Abstract

Patients with Alzheimer’s disease (AD) develop olfactory and gustatory disorders. However, the order of failure and relevance of the pathophysiology are unclear. We compared olfactory identification and whole mouth gustation in patients with AD to those with mild cognitive impairment (MCI) and to healthy controls (HC) and assessed correlations with pathophysiology. Patients with AD (n = 40), MCI (n = 34), and HC (n = 40) were recruited. We performed the Odor Stick Identification Test for Japanese (OSIT-J), gustatory test by the intraoral dropping method using taste solutions, Mini-Mental State Examination (MMSE), Alzheimer’s Disease Assessment Scale-cognitive subscale Japanese version (ADAS-J cog), Touch Panel-type Dementia Assessment Scale (TDAS), and measurement of amyloid β (Aβ) 42 and phosphorylated tau (p-tau) 181 levels in cerebrospinal fluid (CSF). Patients with AD and MCI had lower OSIT-J scores than did the HC. The OSIT-J score was correlated with the MMSE, ADAS-J cog, TDAS, and Aβ42 results. There were no significant differences in the gustatory test scores among the three groups. The gustatory test score was only correlated with the MMSE, ADAS-J cog, and TDAS results. Olfactory function decreased in AD and MCI patients and was associated with CSF biomarker levels and cognitive disorders. The results suggest that olfactory function is impaired in early stage of AD. Gustatory function was not correlated with CSF biomarkers, which suggests that it may not be impaired in early stage of AD.

Keywords

Alzheimer’s disease Mild cognitive impairment Olfactory function Gustatory function Cerebrospinal fluid biomarker Cognitive function 

Notes

Acknowledgments

We thank the patients who participated in our study and their families. We also thank the staff at Shinsei Hospital (Kurayoshi, Japan) who cooperated in this study.

Compliance with ethical standards

The study design was approved by the ethics committee of Tottori University. The research protocol was explained to the patients and/or relatives, and informed consent for their participation was obtained.

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag Italia S.r.l., part of Springer Nature 2017

Authors and Affiliations

  1. 1.Department of Biological Regulation, School of Health Science, Faculty of MedicineTottori UniversityYonagoJapan

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