International Psychogeriatrics



Persistent mild cognitive impairment in geriatric depression


Jung Sik Lee a1, Guy G. Potter a2, H. Ryan Wagner a2, Kathleen A. Welsh-Bohmer a2a3 and David C. Steffens a2c1
a1 Yong-In Mental Hospital, Yong-In, Korea
a2 Departments of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, NC, U.S.A.
a3 The Joseph and Kathleen Bryan Alzheimer's Disease Research Center, Duke University Medical Center, Durham, NC, U.S.A.

Article author query
lee js   [PubMed][Google Scholar] 
potter gg   [PubMed][Google Scholar] 
wagner hr   [PubMed][Google Scholar] 
welsh-bohmer k   [PubMed][Google Scholar] 
steffens dc   [PubMed][Google Scholar] 

Abstract

Background: Cognitive impairment often occurs with geriatric depression and impairments may persist despite remission of depression. Although clinical definitions of mild cognitive impairment (MCI) have typically excluded depression, a neuropsychological model of MCI in depression has utility for identifying individuals whose cognitive impairments may persist or progress to dementia.

Methods: At baseline and 1-year follow-up, 67 geriatric patients with depression had a comprehensive clinical examination that included depression assessment and neuropsychological testing. We defined MCI by a neuropsychological algorithm and examined the odds of MCI classification at Year 1 for remitted depressed individuals with baseline MCI, and examined clinical, functional and genetic factors associated with MCI.

Results: Fifty-four percent of the sample had MCI at baseline. Odds of MCI classification at Year 1 were four times greater among patients with baseline MCI than those without. Instrumental activities of daily living were associated with MCI at Year 1, while age and APOE genotype was not.

Conclusions: These results confirm previous observations that MCI is highly prevalent among older depressed adults and that cognitive impairment occurring during acute depression may persist after depression remits. Self-reported decline in functional activities may be a marker for persistent cognitive impairment, which suggests that assessments of both neuropsychological and functional status are important prognostic factors in the evaluation of geriatric depression.

(Received November 2 2005)
(returned for revision December 1 2005)
(revised version received March 27 2006)
(Accepted March 28 2006)
(Published Online July 12 2006)


Key Words: older people; cognition; longitudinal; dementia.

Correspondence:
c1 Correspondence should be addressed to: David C. Steffens, Duke University Medical Center, Box 3903, Durham, NC 27710, U.S.A. Phone: +1 919 684 3746; Fax: +1 919 681 7668. Email: steff001@mc.duke.edu.


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