Detection of mild cognitive impairment with the Neuropsychological Computerized Screening Battery.
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Abstract
Objectives: The purpose of the present research was to validate the use of the effectiveness of the Batería Neuropsicológica Computarizada de Tamizaje (BNCT) to detect Mild cognitive impairment (MCI) compared to a gold-standard neuropsychological assessment. We also compared the diagnostic accuracy of the BNCT with another frequently used screening test: the Montreal Cognitive Assessment (MoCA). Methods: Using a cross-sectional design and an intentional sampling we selected 23 elderly adults who completed a neuropsychological assessment and who were diagnosed as MCI. The average age was 74.7 years, all presented subjective complaints of cognitive impairment not of enough severity as to interfere with their instrumental activities for daily living and fulfilled the diagnostic clinical criteria of MCI according to Peterson (1999). We compared the diagnostic accuracy of the BNCT and the MoCA with the results obtained by the neuropsychological battery. Results: According to the complete neuropsychological evaluation the 23 patients were classified as MCI . In the BNCT 91% of the patients were classified with MCI and showed alterations delay recall (56%), time orientation (48%), sequential drawing (43%), verbal memory (30%) and opposite reactions (26%).
MoCA classified as MCI 79% of the patients and negative 21% of the sample. Tasks that predicted MCI were delay recall (81%), drawing of a cube (52%), clock drawing (47%), digit span (38%), subtraction (24%), phonological fluency (19%) and trial making(14%).
Patients who were wrongly classified had low educational level ( less than 5 years of schooling experience) .According to the results of the complete neuropsychological battery, the BNCT provides better classification of subjects with MCI than the MoCA, since it uses norms according to age and education, while the MoCA does not consider these variables.
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