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Related Experiment Videos

Essential tremor: mild olfactory dysfunction in a cerebellar disorder.

LaKeisha M Applegate1, Elan D Louis

  • 1Gertude H. Sergievsky Center, College of Physicians and Surgeons, Columbia University, New York, NY, USA.

Parkinsonism & Related Disorders
|August 17, 2005
PubMed
Summary

Essential tremor (ET) patients show impaired smell, even after accounting for cognitive deficits. This suggests the cerebellum may influence olfactory processing in essential tremor.

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Area of Science:

  • Neuroscience
  • Olfactory Research
  • Movement Disorders

Background:

  • Olfactory dysfunction is observed in cerebellar disorders like essential tremor (ET).
  • Mild cognitive deficits in ET may confound previous olfaction test results.
  • The cerebellum's role in central olfactory processing is increasingly recognized.

Purpose of the Study:

  • To investigate olfactory dysfunction in essential tremor (ET) patients.
  • To determine if mild cognitive deficits explain reduced olfaction test scores in ET.
  • To further explore the cerebellum's involvement in olfactory processing.

Main Methods:

  • Expanded sample size to 87 ET cases and 92 controls.
  • Utilized the University of Pennsylvania Smell Identification Test (UPSIT).

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  • Adjusted analysis for Mini-Mental State Test (MMST) scores and other confounders.

    • Main Results:

    • ET cases scored significantly lower on the UPSIT compared to controls (p = 0.04).
    • This olfactory deficit persisted after adjusting for MMST scores.
    • The findings indicate olfactory dysfunction is independent of cognitive deficits in ET.

    Conclusions:

    • Olfactory dysfunction in essential tremor (ET) is not solely due to mild cognitive deficits.
    • The cerebellum likely plays a direct role in central olfactory processing.
    • Further research into the neuroanatomical links between cerebellum and olfaction is warranted.