The Alzheimer’s Disease Assessment Scale: Modifications That Can Enhance its Use in Future Clinical Trials
The Alzheimer’s Disease Assessment Scale (ADAS) is widely used in clinical trials of potential treatments for Alzheimer’s disease (AD). The cognitive portion of the ADAS (ADAS-Cog) consists of 11 items designed to assess the severity of memory, language, praxis and orientation impairments. The noncognitive portion of the ADAS (ADAS-Non-Cog) consists of 10 clinician rated items assessing the severity of depressive symptoms, psychosis, agitation, attention and tremors. These items are described in previous publications (Mohs et al., 1982; Rosen et al., 1984), and longitudinal data have demonstrated that the cognitive portion of the scale measures progressive cognitive impairment across a broad range of dementia severity (Stern et al., 1994). The ADAS-Cog has been used as the principal measure of cognitive outcome in several multicenter clinical trials of potential treatments for AD, including the trials of tacrine (Farlow et al., 1992; Knapp et al., 1994).
KeywordsDementia Severity Mini Mental State Exam Progressive Cognitive Impairment Antidementia Drug Cognitive Instrument
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