Institute for Research in Extramural Medicine, Vrije Universiteit, Amsterdam
Institute for Research in Extramural Medicine and Department of Psychiatry, Vrije Universiteit, Amsterdam
Institute for Research in Extramural Medicine and Department of Clinical Epidemiology and Biostatistics, Vrije Universiteit, Amsterdam
Department of Neurology, Universiteit van Amsterdam, The Netherlands
Correspondence: M. I. Geerlings, Department of Epidemiology & Biostatistics, Erasmus Medical Center Rotterdam, PO Box 1738, 3000 DR Rotterdam, The Netherlands. Tel: +31 10 408 7478; Fax: +31 10 408 9382; e-mail: geerlings{at}epib.fgg.eur.nl
Declaration of interest Grants detailed in Acknowledgements. No conflict of interest.
Background Depression may be associated with cognitive decline in elderly people with impaired cognition.
Aims To investigate whether depressed elderly people with normal cognition are at increased risk of cognitive decline and Alzheimer's disease.
Methods Two independent samples of older people with normal
cognition were selected from the community-based Amsterdam Study of the
Elderly (AMSTEL) and the Longitudinal Aging Study Amsterdam (LASA). In AMSTEL,
depression was assessed by means of the Geriatric Mental State Schedule.
Clinical diagnoses of incident Alzheimer's disease were made using a two-step
procedure. In LASA, depression was assessed with the Center for Epidemiologic
Studies Depression Scale. Cognitive decline was defined as a drop of
3 on
the Mini-Mental State Examination at follow-up.
Results Both in the AMSTEL and the LASA sample, depression was associated with an increased risk of Alzheimer's disease and cognitive decline, respectively, but only in subjects with higher levels of education.
Conclusions In a subgroup of more highly educated elderly people, depression may be an early manifestation of Alzheimer's disease before cognitive symptoms become apparent.
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