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Premorbid History of Major Depression and the Depressive Syndrome of Alzheimer's Disease

From the Department of Psychiatry, Western Psychiatric Institute and Clinic, University of Pittsburgh School of Medicine, Pittsburgh, PA.

To test the hypothesis that primary degenerative dementia of the Alzheimer type (PDD-AT) may increase the likelihood of expression of a lifetime vulnerability to the development of depression, the authors compared the premorbid rates of major depression in psychiatric inpatients with dementia, with or without a concurrent syndrome of depression. A premorbid history of major depression was four times more common in patients with the depressive syndrome of PDD-AT than in PDD-AT patients without depression. The authors discuss the significance of these findings for pathophysiologic models and estimates of comorbidity of depression in PDD-AT.