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Olfactory dysfunction in the Shy-Drager syndrome

L E Nee1, J Scott, R J Polinsky

  • 1Clinical Neuropharmacology Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892.

Clinical Autonomic Research : Official Journal of the Clinical Autonomic Research Society
|August 1, 1993
PubMed
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Olfactory dysfunction, including anosmia and microsmia, is common in patients with Shy-Drager syndrome (multiple system atrophy). This suggests a potential link between olfactory deficits and the neurodegenerative disease.

Area of Science:

  • Neurology
  • Neuroscience
  • Clinical Medicine

Background:

  • The etiology of Shy-Drager syndrome, now known as multiple system atrophy (MSA), remains unknown.
  • Previous research suggested a preliminary association between environmental-occupational risk factors and MSA.
  • Olfactory dysfunction is a recognized, yet understudied, symptom in neurodegenerative diseases.

Purpose of the Study:

  • To investigate olfactory function in patients with multiple system atrophy (MSA).
  • To explore the potential relationship between olfactory deficits and the progression of MSA.

Main Methods:

  • Olfactory function was assessed in eight patients diagnosed with MSA at various disease stages.
  • A self-administered olfactory test was employed for the assessment.

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  • Patient results were compared against a control group of 203 age- and sex-matched individuals.
  • Main Results:

    • Seven out of eight MSA patients scored below the 39th percentile on the olfactory test compared to controls.
    • Five patients exhibited either total anosmia (complete loss of smell) or microsmia (reduced sense of smell).

    Conclusions:

    • Significant olfactory dysfunction is prevalent in patients with multiple system atrophy (MSA).
    • These findings suggest a potential link between olfactory system impairment and MSA.
    • Further research is warranted to understand the clinical significance of these olfactory abnormalities in MSA.