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Depression as a modifiable factor to decrease the risk of dementia.

O P Almeida1,2,3, G J Hankey4,5, B B Yeap4,6

  • 1School of Psychiatry and Clinical Neurosciences, University of Western Australia, Perth, WA, Australia.

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Older men with depression face a higher risk of dementia. Antidepressant use did not reduce this risk, suggesting depression may signal early dementia rather than being a direct cause.

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Area of Science:

  • Neuroscience
  • Gerontology
  • Psychiatry

Background:

  • Depression is a known risk factor for dementia, but its causal role remains uncertain.
  • Understanding the relationship between depression and dementia is crucial for developing effective prevention and treatment strategies.

Purpose of the Study:

  • To investigate if antidepressant use mitigates dementia risk in older men with depression.
  • To determine if the association between depression and dementia is independent of the time between depression onset and dementia diagnosis.

Main Methods:

  • A 14-year longitudinal study of 4922 cognitively healthy men aged 71-89.
  • Data collected on depression history, depressive symptom severity, antidepressant use, and other health factors.
  • Dementia onset and mortality ascertained via the Western Australian Data Linkage System over 8.9 years of follow-up.

Main Results:

  • Men with past or current depression had a significantly increased risk of developing dementia (SHRs 1.3 and 1.5, respectively).
  • Antidepressant use did not reduce the dementia risk associated with depression.
  • The risk of dementia increased with the severity of depressive symptoms, from questionable (SHR 1.2) to severe (SHR 2.1).
  • The association between depression and dementia was primarily observed within the first 5 years of follow-up.

Conclusions:

  • History of depression is linked to an increased risk of dementia in older men.
  • Depression appears more likely to be a marker of early-stage dementia than a modifiable risk factor.
  • Further research is needed to elucidate the complex relationship between depression and dementia pathogenesis.