Depression Predicts Cognitive Disorders in Older Primary Care Patients
J Clin Psychiatry 2010;71(1):74-79
© Copyright 2014 Physicians Postgraduate Press, Inc.
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Objective: To investigate whether depression
is independently associated with increased risk
of incident dementia or cognitive disorder not
otherwise specified (NOS) in an older primary
Method: This was a prospective 3-year cohort study of 470 patients aged ≥ 65 years without baseline cognitive disorders who were recruited from primary care offices. Annual assessments completed from March 2003 through December 2005 included the use of the Structured Clinical Interview for DSM-IV to diagnose major depressive disorder (MDD) and minor depression (MinD) and the Hamilton Depression Rating Scale
(HDRS) for depressive symptom severity. The Mini-Mental State Exam, Mattis Dementia Rating Scale-initiation/perseveration subscale, and the Trail Making Tests A and B informed diagnoses
of dementia and cognitive disorder NOS.
Results: 36 subjects, representing a cumulative incidence of 13%, developed dementia or cognitive disorder NOS over 3 years. Using Cox proportional hazard survival models to calculate the risk ratio of depression for development of cognitive disorders, MDD and MinD (HR = 3.68; 95% CI, 2.1–6.42 and HR = 1.84; 95% CI, 1.05–3.21, respectively) and HDRS scores (HR = 1.07; 95% CI, 1.02–1.12) predicted new onset dementia or cognitive disorder NOS, when covarying age, gender, and education.
Conclusions: Depressive disorders pose
increased risk of incident dementia or cognitive disorder NOS in older primary care patients. Clinicians treating depressed older adults should monitor for development of cognitive disorders.
Submitted: September 19, 2008; accepted April 10, 2009
Corresponding author: Lisa L. Boyle, MD, Department of Psychiatry, Box Psych, University of Rochester Medical Center, 300 Crittenden Blvd, Rochester, NY 14642 (Lisa_Boyle@urmc.rochester.edu).