People with Parkinson Disease and Normal MMSE Score Have a Broad Range of Cognitive Performance
Identifieur interne : 000412 ( Pmc/Corpus ); précédent : 000411; suivant : 000413People with Parkinson Disease and Normal MMSE Score Have a Broad Range of Cognitive Performance
Auteurs : Dj Burdick ; B. Cholerton ; Gs Watson ; A. Siderowf ; Jq Trojanowski ; D. Weintraub ; B. Ritz ; Sl Rhodes ; R. Rausch ; Sa Factor ; C. Wood-Siverio ; Jf Quinn ; Ka Chung ; S. Srivatsal ; Kl Edwards ; Tj Montine ; Cp Zabetian ; Jb LeverenzSource :
- Movement disorders : official journal of the Movement Disorder Society [ 0885-3185 ] ; 2014.
Abstract
Cognitive impairment, including dementia, is common in Parkinson disease (PD). The Mini-Mental State Examination (MMSE) has been recommended as a screening tool for PDD, with values below 26 indicative of possible dementia. Using a detailed neuropsychological battery, we examined the range of cognitive impairment in PD patients with a MMSE score ≥ 26.
In this multi-center, cross-sectional, observational study, we performed neuropsychological testing in a sample of 788 PD patients with MMSE ≥ 26. Evaluation included tests of global cognition, executive function, language, memory, and visuospatial skills. A consensus panel reviewed results for 342 subjects and assigned a diagnosis of no cognitive impairment, mild cognitive impairment, or dementia.
67% of the 788 subjects performed 1.5 standard deviations below the normative mean on at least one test. On eight of the 15 tests, more than 20% of subjects scored 1.5 standard deviations or more below the normative mean. Greatest impairments were found on Hopkins Verbal Learning and Digit Symbol Coding tests. The sensitivity of the MMSE to detect dementia was 45% in a subset of participants who underwent clinical diagnostic procedures.
A remarkably wide range of cognitive impairment can be found in PD patients with a relatively high score on the MMSE, including a level of cognitive impairment consistent with dementia. Given these findings, clinicians must be aware of the limitations of the MMSE in detecting cognitive impairment, including dementia, in PD.
Url:
DOI: 10.1002/mds.25924
PubMed: 25073717
PubMed Central: 4162839
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