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Clinical Manifestations.

Yan Chen1, You Wu2, Dandan Wang3

  • 1Shanghai Jiao Tong University School of Medicine, Shanghai, Shanghai, China.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
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Summary
This summary is machine-generated.

Late-life depression with cognitive impairment shows a delayed niacin skin flushing response (NSFR). This delayed NSFR effectively identifies cognitive impairment in LLD and predicts future cognitive decline.

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Area of Science:

  • Neuroscience
  • Gerontology
  • Psychiatry

Background:

  • Late-life depression (LLD) with cognitive impairment (CI) may progress to Alzheimer's disease (AD).
  • Mechanisms linking LLD, CI, and AD are not fully understood.
  • Niacin skin flushing response (NSFR) anomalies are noted in neuropsychiatric disorders, but not well-studied in LLD.

Purpose of the Study:

  • To investigate the potential of NSFR as a predictor of CI in LLD patients.
  • To explore the relationship between NSFR and cognitive function in LLD.
  • To assess NSFR's utility in differentiating LLD subtypes.

Main Methods:

  • 86 LLD patients (with/without CI), 20 AD patients, and 32 healthy controls (HCs) were studied.
  • Cognitive function assessed using the Montreal Cognitive Assessment (MoCA).
  • NSFR measured using a modified method, with LogEC50 indicating response rate; logistic regression and ROC analysis used.

Main Results:

  • Elevated LogEC50 (delayed NSFR) observed in LLD with CI compared to LLD without CI and HCs.
  • LogEC50 effectively distinguished LLD with CI from LLD without CI via ROC analysis.
  • Baseline LogEC50 predicted cognitive outcomes in LLD after six months.

Conclusions:

  • LLD with CI is characterized by a delayed NSFR.
  • NSFR serves as a potential biomarker for identifying CI in LLD.
  • Delayed NSFR at baseline predicts poorer cognitive outcomes in LLD patients.