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Abstract: History of depression as a risk factor for dementia: an updated review

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By Anthony F. Jorm • www.ProHealth.com • February 25, 2002




Objective: This review updates an earlier meta-analysis of the data on history of depression as a risk factor for dementia. It also considers the available evidence on the hypotheses proposed to explain the association between history of depression and dementia.

Method: A meta-analysis was carried out on results from seven case-control and six prospective studies. A qualitative review was carried out on the evidence related to the hypotheses to explain the association.

Results: The meta-analysis found evidence to support an association from both case-control studies (estimated relative risk 2.01; 95 CI 1.16-3.50) and prospective studies (estimated relative risk 1.87; 95 CI 1.09-3.20). However, the evidence did not clearly support any one hypothesis explaining the association. The most likely contenders are: (i) depression can be an early prodrome of dementia, (ii) depression brings forward the clinical manifestation of dementing diseases, and (iii) depression leads to damage to the hippocampus through a glucocorticoid cascade.

Conclusions: The possibility that history of depression is a risk factor for dementia needs to be taken seriously and explanations of the association need to be further researched.




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