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Temporal relation between depression and cognitive impairment in old age: prospective population based study.
David J Vinkers1, Jacobijn Gussekloo, Max L Stek
1Section of Gerontology and Geriatrics, Department of General Internal Medicine, Leiden University Medical Centre, PO Box 9600, 2300 RC Leiden, Netherlands.
BMJ (Clinical Research Ed.)
|September 4, 2004
Summary
In older adults, depressive symptoms are linked to cognitive impairment. However, depression alone does not accelerate cognitive decline over time.
Area of Science:
- Geriatric Medicine
- Neuroscience
- Psychiatry
Background:
- Cognitive impairment and depression are prevalent in old age.
- Understanding their temporal relationship is crucial for effective interventions.
Purpose of the Study:
- To investigate the longitudinal relationship between depressive symptoms and cognitive function in elderly individuals.
- To determine if depression predicts future cognitive decline or vice versa.
Main Methods:
- A prospective, population-based study followed 500 individuals aged 85 years for four years.
- Annual assessments included depressive symptoms (Geriatric Depression Scale), global cognition (MMSE), attention (Stroop), processing speed (LDCT), and memory (12-word learning test).
Main Results:
- At baseline (age 85), depressive symptoms and cognitive impairment were strongly correlated (P < 0.001).
- An increasing rate of depressive symptoms during follow-up was associated with poorer baseline attention, immediate recall, and delayed recall.
- However, baseline depressive symptoms did not predict accelerated cognitive decline over the four-year period (P > 0.05).
Conclusions:
- While cognitive impairment may be associated with developing depressive symptoms in the elderly, depression itself does not appear to be a risk factor for cognitive decline.
- Caregivers should monitor for depressive symptoms in cognitively impaired older adults.