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  • Title: Validity of the Dementia Rating Scale in assessing cognitive function in Parkinson's disease.
    Author: Brown GG, Rahill AA, Gorell JM, McDonald C, Brown SJ, Sillanpaa M, Shults C.
    Journal: J Geriatr Psychiatry Neurol; 1999; 12(4):180-8. PubMed ID: 10616865.
    Abstract:
    Two studies examined the validity of the Dementia Rating Scale (DRS) as a measure of cognitive functioning among patients with Parkinson's disease (PD). The DRS accounted for more variation in the level of cognitive functioning of PD patients than either the Mini-Mental Status Examination or a battery of tests selected to assess specific cognitive deficits associated with PD. Further, DRS subtests displayed strong convergent and discriminant validity with a comprehensive Criterion Neuropsychology Battery. The DRS subtests appear to be valid measures of attention, perseveration, conceptualization, and memory among PD patients. However, the DRS-Construction subtest should be supplemented with additional visuoconstructional items to provide a thorough screen of cognitive functioning in PD. Although about three-quarters of nondemented PD patients did not appear to have any specific cognitive deficits on the DRS, the remaining patients were impaired on the Construction or Initiation/Perseveration subtests of the DRS. In summary, the DRS is a valid mental status screening test of cognitive functioning for individuals with PD.
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