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Olfactory function in Parkinson's disease subtypes

M B Stern1, R L Doty, M Dotti

  • 1Department of Neurology, Graduate Hospital, Philadelphia, PA 19146.

Neurology
|February 1, 1994
PubMed
Summary
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Olfactory dysfunction, a common Parkinson's disease (PD) symptom, varies between PD subtypes. Benign PD and tremor-predominant PD show less smell impairment than malignant and postural instability-gait disorder (PIGD)-predominant PD, respectively.

Area of Science:

  • Neurology
  • Neuroscience
  • Olfactory Research

Background:

  • Olfactory dysfunction is a hallmark symptom of idiopathic Parkinson's disease (PD).
  • The degree of olfactory impairment can vary among individuals with PD.
  • Understanding variations in olfactory deficits across PD subtypes may offer insights into disease heterogeneity.

Purpose of the Study:

  • To investigate whether distinct Parkinson's disease subtypes exhibit differential patterns of olfactory dysfunction.
  • To compare smell identification test scores across clinically defined PD subtypes.

Main Methods:

  • Utilized the University of Pennsylvania Smell Identification Test (UPSIT) to assess olfactory function.
  • Compared UPSIT scores between different PD subtypes: benign vs. malignant PD, and tremor-predominant vs. postural instability-gait disorder (PIGD)-predominant PD.

Related Experiment Videos

  • Analyzed olfactory function differences based on disease onset age (young vs. older) and sex.

    • Main Results:

    • Significant differences in UPSIT scores were found between benign PD (mean=22.51) and malignant PD (mean=17.38).
    • Patients with tremor-predominant PD (mean=23.43) had significantly better smell identification than those with PIGD-predominant PD (mean=17.35).
    • No significant olfactory differences were observed between young-onset and older-onset PD patients. Women generally outperformed men across subtypes.

    Conclusions:

    • Olfactory dysfunction severity is associated with specific Parkinson's disease clinical subtypes.
    • Smell identification deficits are more pronounced in malignant and PIGD-predominant PD subtypes.
    • Sex influences olfactory function in Parkinson's disease patients, with women showing better performance.