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Parkinson's disease and aging: same or different process?

Christopher H Hawkes1

  • 1Essex Neuroscience Centre, Queen's Hospital, Romford, Essex RM7 0AG. chrishawkes@msn.com

Movement Disorders : Official Journal of the Movement Disorder Society
|October 27, 2007
PubMed
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Parkinson's disease (PD) is linked to faster smell loss than normal aging. This olfactory decline in PD patients suggests a disease-specific process, not just premature aging.

Area of Science:

  • Neuroscience
  • Gerontology
  • Clinical Neurology

Background:

  • Parkinson's disease (PD) is associated with olfactory dysfunction, suggesting smell loss may reflect disease progression.
  • The relationship between PD, aging, and smell loss requires further investigation to differentiate disease-specific processes from accelerated aging.

Purpose of the Study:

  • To investigate the relationship between age and olfactory decline in Parkinson's disease patients compared to healthy controls.
  • To determine if olfactory decline in PD represents accelerated aging or a distinct pathological process.

Main Methods:

  • Cross-sectional analysis of University of Pennsylvania Smell Identification Test (UPSIT) scores from 266 PD patients and 263 controls.
  • Application of linear and quadratic regression models to assess age-related decline in olfactory function in both groups.

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Main Results:

  • Both Parkinson's disease patients and controls showed a decline in olfactory function with age.
  • Olfactory scores in PD patients were significantly lower than controls, even at younger ages.
  • The data indicated that olfactory decline in PD is more rapid than typical age-associated decline.

Conclusions:

  • The olfactory deficit in Parkinson's disease is not attributable to premature aging but represents a disease-specific process.
  • The findings support the hypothesis that Parkinson's disease may initiate as an acute event with subsequent rapid progression of olfactory decline.