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Current Alzheimer Research

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ISSN (Print): 1567-2050
ISSN (Online): 1875-5828

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Systematic Review Article

Is the Alzheimer's Disease Assessment Scale-Cognitive Subscale Useful in Screening for Mild Cognitive Impairment and Alzheimer's Disease? A Systematic Review

Author(s): Seong-Hi Park* and Kuem Sun Han

Volume 19, Issue 3, 2022

Published on: 17 May, 2022

Page: [202 - 211] Pages: 10

DOI: 10.2174/1567205019666220404104854

Price: $65

Abstract

Background: Mild cognitive impairment (MCI) and Alzheimer’s disease (AD) are screened to distinguish whether the cognitive decline in older adults is attributed to pathological causes rather than normal aging.

Objective: The purpose of this review was to analyze the diagnostic performance of the Alzheimer's Disease Assessment Scale-Cognitive Subscale (ADAS-Cog) in screening for MCI and AD.

Methods: Electronic searches were performed on MEDLINE, EMBASE, CINAHL, and PsycArticles databases using the following keywords: dementia and ADAS-Cog. The Quality Assessment of Diagnostic Accuracy Studies-2 was used to check the risk of bias in the diagnostic studies.

Results: We reviewed 14 studies, including 3,875 patients who met the selection criteria. In 2,624 MCI patients from nine studies, the pooled sensitivity of ADAS-Cog was 0.80 (95% confidence interval [CI], 0.68–0.88), the pooled specificity was 0.84 (95% CI, 0.75–0.90), and the area under the curve of summary receiver-operating characteristic curves (SROC AUC) was 0.89 (SE = 0.03). In 2,517 AD patients from 10 studies, the pooled sensitivity and pooled specificity were 0.91 (95% CI, 0.86–0.95) and 0.93 (95% CI, 0.88–0.95), respectively, and the sROC AUC was 0.97 (SE = 0.01). Although sub-analyzed according to age and years of education, there was no significant difference in the predictive validity of the ADAS-Cog.

Conclusion: The ADAS-Cog has high predictive validity as a screening tool in both MCI and AD and has better diagnostic performance in patients with AD. When early screening for AD is desired, ADAS-Cog is a first-stage screening tool that can be initially employed.

Keywords: Alzheimer’s disease, cognitive dysfunction, older adults, neuropsychological tests, sensitivity, specificity, systematic review.

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