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  • Title: Predictive value of rapid decline in mini mental state examination in clinical practice for prognosis in Alzheimer's disease.
    Author: Soto ME, Andrieu S, Cantet C, Reynish E, Ousset PJ, Arbus C, Gillette-Guyonnet S, Nourhashémi F, Vellas B, REAL.FR group.
    Journal: Dement Geriatr Cogn Disord; 2008; 26(2):109-16. PubMed ID: 18617740.
    Abstract:
    BACKGROUND: Given the poorer prognosis of Alzheimer's disease (AD) patients with rapid cognitive decline (RCD), there is a need for a clinical assessment tool to detect these patients. OBJECTIVE: To investigate if there is a Mini Mental State Examination (MMSE) threshold of decline during 6 months of follow-up which predicts a worse disease progression at the 2-year follow-up. Then, to propose a feasible definition of RCD for routine clinical practice. METHODS: Data from 565 community-dwelling AD patients recruited in a multi-centre prospective observational study were assessed. All patients had MMSE scores between 10 and 26 at inclusion and were followed up 6-monthly using a standardised clinical assessment. Patients were classified as rapid and non-rapid decliners according to 2 MMSE decline thresholds tested: >or=3 points and >or=4 points for decline over the first 6 months of the study. Worse disease outcome was defined as attainment of 1 of 4 clinical end points 18 months later: institutionalisation, death, increased physical dependence or worsening of behavioural and psychological symptoms. RESULTS: 135 patients (23.9%) lost >or=3 points during the first 6 months of follow-up in the MMSE score and 77 patients (13.6%) lost >or=4 points. Patients with moderate disease and a loss of >or=4 points showed a significantly increased risk of mortality (HR = 5.6, 95% CI 2.0-15.9) and institutionalisation (HR = 3.8, 95% CI 1.8-8.1) at the 2-year follow-up. The same MMSE threshold was associated with a higher risk of physical decline (HR = 1.6, 95% CI 1.2-2.3). CONCLUSION: The loss of >or=4 points in MMSE during the first 6 months of follow-up seems to be a predictor of worse clinical course, and thus it could be used to define the category of AD patients presenting a RCD.
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