Objective features of subjective cognitive decline in a United States national database |
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| Authors: | Stephanie Kielb Emily Rogalski Sandra Weintraub Alfred Rademaker |
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| Institution: | 1. Cognitive Neurology and Alzheimer''s Disease Center, Northwestern University Feinberg School of Medicine, Chicago, IL, USA;2. Department of Psychiatry and Behavioral Sciences, Division of Clinical Psychology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA;3. Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA;4. Department of Preventive Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA |
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| Abstract: | IntroductionFunctional and cognitive features of subjective cognitive decline (SCD) were identified in a longitudinal database from the National Alzheimer's Coordinating Center.MethodsCognitively normal older adults with (SCD+) and without (SCD?) self-reported memory complaints (N = 3915) were compared on (1) baseline Functional Assessment Questionnaire ratings, (2) baseline scores and longitudinal rate of change estimates from nine neuropsychological tests, and (3) final clinical diagnoses.ResultsSCD+ had higher baseline ratings of functional impairment, reduced episodic memory practice effects and poorer performance on neuropsychological tests of psychomotor speed and language, and higher frequencies of mild cognitive impairment and dementia diagnoses at the end of follow-up compared with the SCD-group.DiscussionSubtle clinical features of SCD identified in this large cohort are difficult to detect at the individual level. More sensitive tests are needed to identify those with SCD who are vulnerable to cognitive decline and dementia. |
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| Keywords: | Alzheimer dementia Subjective cognitive decline Subjective cognitive impairment Memory complaint SCD SMC SMI Preclinical Alzheimer disease Prodromal Alzheimer disease Mild cognitive impairment |
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