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Cognitive performance and functional competence in coexisting dementia and depression.

A R Breen, E B Larson, B V Reifler

    Journal of the American Geriatrics Society
    |February 1, 1984
    PubMed
    Summary

    Depression significantly lowers full-scale IQ in elderly patients with Alzheimer's disease, impacting their functional competence. Cognitive assessment reveals differing patterns of intellectual and memory function relationships with daily living abilities.

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    Area of Science:

    • Gerontology
    • Neuroscience
    • Psychiatry

    Background:

    • Alzheimer's disease (AD) is a progressive neurodegenerative disorder affecting cognitive functions in the elderly.
    • The comorbidity of depression in AD patients can potentially exacerbate cognitive decline and impact functional outcomes.
    • Understanding the specific cognitive deficits and their relationship with functional competence is crucial for effective patient management.

    Purpose of the Study:

    • To investigate the impact of coexisting depression on intelligence, memory, and functional competence in elderly individuals with Alzheimer's type dementia.
    • To compare cognitive profiles and functional abilities between patients with dementia alone and those with dementia and comorbid depression.

    Main Methods:

    • A cohort of elderly community residents aged 57-88 years with senile dementia of the Alzheimer's type was assessed.

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  • Participants were divided into two groups: dementia only (n=21) and dementia with coexisting depression (n=14).
  • Cognitive assessment included the Wechsler Adult Intelligence Scale (WAIS), Wechsler Memory Scale (WMS), and Dementia Rating Scale (DRS).

    • Main Results:

    • No significant differences were observed in verbal IQ, performance IQ, or Wechsler Memory Scale memory quotient between the groups.
    • Patients with coexisting dementia and depression exhibited significantly lower full-scale IQ scores compared to those with dementia alone.
    • While cognitive measures correlated with functional competence in both groups, the patterns differed: intellectual measures were more predictive in dementia-only patients, whereas memory measures were more predictive in patients with comorbid depression.

    Conclusions:

    • Coexisting depression significantly impacts overall intellectual functioning (full-scale IQ) in elderly patients with Alzheimer's disease.
    • The relationship between cognitive domains (intelligence vs. memory) and functional competence is modulated by the presence of depression in dementia.
    • These findings highlight the importance of assessing and managing depression in AD patients to potentially improve cognitive and functional outcomes.