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The role of depression severity in the cognitive functioning of elderly subjects with central nervous system disease
R van Reekum1, M Simard, D Clarke
1Department of Psychiatry, University of Toronto, Ont.
Insights
Depression significantly impacts cognitive function, particularly frontal lobe abilities, in patients with central nervous system (CNS) disease. This study confirms a causal link, highlighting depression
Area of Science:
- Neuroscience
- Geriatric Medicine
- Psychiatry
Background:
- Cognitive dysfunction is common in patients with central nervous system (CNS) disease.
- The relationship between depression and cognitive impairment in this population requires further elucidation.
Purpose of the Study:
- To investigate the hypothesis of a causal relationship between depression and cognitive dysfunction in patients with CNS disease.
- To determine if depression severity predicts cognitive decline in individuals with CNS conditions.
Main Methods:
- Retrospective analysis of a clinical database from a tertiary geriatric day hospital.
- Inclusion of 65 patients with depression and CNS disease, and 201 patients with depression but no CNS disease.
- Assessment using the Hamilton Depression Rating Scale (Ham-D) and the Mattis Dementia Rating Scale (MDRS).
Main Results:
- In patients with CNS disease, Hamilton Depression Rating Scale (Ham-D) scores significantly predicted performance on the Mattis Dementia Rating Scale (MDRS) (R = -0.19, p = 0.02).
- Depression severity (Ham-D score) more strongly correlated with frontal system cognitive function (MDRS frontal subtest, R = -0.262, p = 0.005).
- No significant association between depression scores and cognitive status was found in patients without CNS disease.
Conclusions:
- Depression is a contributing factor to frontal cognitive dysfunction in patients with central nervous system (CNS) disease.
- The findings underscore the importance of managing depression to mitigate cognitive deficits in this patient group.
Objective:
To examine the hypothesis that there is a causal relation between depression and cognitive dysfunction in patients with central nervous system (CNS) disease.
Design:
Retrospective analysis of a clinical database.
Setting:
Tertiary geriatric day hospital.
Patients:
Sixty-five patients with depression and CNS disease, and 201 patients with depression but without CNS disease.
Outcome Measures:
Scores on the Hamilton Depression Rating Scale (Ham-D) and the Mattis Dementia Rating Scale (MDRS).
Results:
A logistic regression analysis using MDRS status as the dependent variable, and a number of clinical variables as the predictor variables, showed that, in patients with CNS disease, only the Ham-D score predicted MDRS status (R = -0.19, p = 0.02). Ham-D score even more strongly predicted scores on a frontal system subtest of the MDRS (R = -0.262, p = 0.005). Ham-D score did not predict MDRS status in patients without CNS disease. Mean Mini Mental State Examination scores for the group with CNS disease were 25.1 at admission and 26.1 at discharge (p < 0.001).
Conclusions:
These findings suggest that depression contributes to frontal cognitive dysfunction in patients with CNS disease.