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Related Concept Videos

Multiple Sclerosis l: Introduction01:19

Multiple Sclerosis l: Introduction

Multiple sclerosis is a chronic autoimmune disease of the central nervous system (CNS) that affects the brain, spinal cord, and optic nerves. It is an inflammatory demyelinating disorder and a leading cause of neurological disability in young adults.EpidemiologyMS commonly begins between 20 and 40 years of age and is twice as common in women. Its exact cause remains unclear, but genetic susceptibility contributes, with higher risk in first-degree relatives and identical twins. A greater...
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A Free-breathing fMRI Method to Study Human Olfactory Function
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Olfactory threshold is impaired in early, active multiple sclerosis.

A Lutterotti1, M Vedovello, M Reindl

  • 1Clinical Department of Neurology, Innsbruck Medical University, Innsbruck, Austria.

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Multiple sclerosis (MS) patients show impaired smell identification and perception. Early MS involves higher smell thresholds, while chronic MS affects smell identification.

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Area of Science:

  • Neurology
  • Ophthalmology
  • Sensory Science

Background:

  • Olfactory dysfunction is a known symptom in multiple sclerosis (MS).
  • However, specific deficits in odour identification, discrimination, and perception thresholds in MS remain uncharacterized.

Purpose of the Study:

  • To evaluate distinct olfactory functions (identification, discrimination, threshold) in MS patients.
  • To correlate olfactory function with clinical, demographic, and quality-of-life factors in MS.

Main Methods:

  • A cross-sectional study involving 50 MS patients and 30 healthy controls.
  • Olfactory function assessed using the Sniffin' Sticks test, measuring identification, discrimination, and threshold.

Main Results:

  • MS patients exhibited significantly lower odour identification, perception threshold, and total scores (TDI).
  • Hyposmia (impaired smell) was more prevalent in MS, affecting identification, threshold, and TDI.
  • Impaired olfactory threshold correlated with recent clinical activity and shorter disease duration (<2 years); identification correlated negatively with disease duration.

Conclusions:

  • Evidence suggests qualitatively distinct hyposmia in MS.
  • Early MS inflammatory phases are linked to increased smell thresholds.
  • Chronic, widespread MS is associated with impaired odour identification.