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Related Experiment Video

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New Methods to Study Gustatory Coding
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Olfactory and Gustatory Dysfunction in Patients With Autoimmune Encephalitis.

Rohat Geran1,2,3, Florian C Uecker4, Harald Prüss3,5

  • 1Department of Neurology, Clinical and Experimental Multiple Sclerosis Research Center, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany.

Frontiers in Neurology
|June 4, 2019
PubMed
Summary

Patients with autoimmune encephalitides (AE) often experience olfactory (OF) and gustatory dysfunction (GF). This study found significantly reduced OF and GF in AE patients compared to healthy controls, suggesting these are unrecognized symptoms.

Keywords:
autoimmune encephalitisgustatory dysfunctionolfactory dysfunctionolfactory testingthreshold discrimination identification test

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Area of Science:

  • Neuroscience
  • Immunology
  • Sensory Science

Background:

  • Autoimmune encephalitides (AE) are a group of rare but serious neurological disorders.
  • The impact of AE on sensory functions, specifically smell and taste, remains largely unexplored.
  • Understanding sensory deficits can provide new insights into the pathophysiology and clinical manifestations of AE.

Purpose of the Study:

  • To investigate olfactory function (OF) and gustatory function (GF) in patients diagnosed with autoimmune encephalitides (AE).
  • To test the hypothesis that OF and GF are impaired in individuals affected by AE.
  • To compare sensory function in AE patients with that of age- and sex-matched healthy controls (HC).

Main Methods:

  • Olfactory function was assessed using the standardized Threshold Discrimination Identification (TDI) score in 32 AE patients and 32 HC.
  • Gustatory function was evaluated using the Taste Strip Test (TST) in a subset of 19 AE patients and 19 HC.
  • Statistical analyses were performed to compare sensory test results between AE patients and HC, and to explore correlations with clinical factors.

Main Results:

  • A significant olfactory dysfunction was observed in 75% of AE patients (24/32) compared to 0% of HC (p < 0.001).
  • AE patients showed significantly reduced scores in olfactory threshold, discrimination, and identification subtests (all p < 0.001).
  • Twenty-six percent of AE patients (5/19) exhibited impaired gustatory function, whereas no HC showed limitations (p < 0.001).

Conclusions:

  • This study provides the first evidence of reduced olfactory and gustatory capacity in patients with autoimmune encephalitides.
  • Olfactory and gustatory dysfunction appear to be previously unrecognized clinical symptoms associated with AE.
  • Further research with larger cohorts is warranted to confirm these findings and elucidate the underlying mechanisms.