The purpose of the present study was to investigate the difference of neuropsychological performance according to the cognitive aging, and to identify the baseline neuropsychological predictors of progression to Alzheimer’s Disease(AD) in patients w...
The purpose of the present study was to investigate the difference of neuropsychological performance according to the cognitive aging, and to identify the baseline neuropsychological predictors of progression to Alzheimer’s Disease(AD) in patients with Mild Cognitive Impairment(MCI).
In study 1, a comprehensive neuropsychological tests were administered to three groups(86 MCI patients, 72 mild AD patients, and 53 normal elderly controls), the accuracy of several neuropsychological measures in differentiation of the each group was compared. The findings were as follows. Discriminant analysis indicated that : verbal recognition memory(SVLT recognition false positive, true positive) was the most effective discriminant for MCI from the normal elderly controls, and the verbal memory(SVLT immediate, delayed, recognition), inhibitory efficiency(K-CWST color reading correct), visual memory(RCFT immediate, delayed recall), category fluency were the most effective discriminants for mild AD from the both MCI and normal elderly controls. When the aforementioned neuropsychological measures are used to differentiate from the normal cognitive aging to pathological cognitive aging, the diagnostic accuracy will improve.
In study 2, 159 MCI patients performed the comprehensive neuropsychological tests at baseline assessment, and the clinical course was followed during 3 years. After the 3 years follow up, progression to AD was investigated, the baseline assessment result was analyzed between the two groups(33 converted MCI, 45 nonconverted MCI). The findings were as follows. Discriminant analysis indicated that verbal recognition memory(SVLT recognition, immediate, delayed recall), visuoconstruction drawing speed(RCFT copy time) and inhibitory efficiency(K-CWST color reading correct) were the most effective discriminants for converted MCI from the nonconverters. This result suggests that neuropsychological assessment at the MCI phase will provide useful information for predicting the progression to AD in MCI, and screening the MCI patients at high risk for progression of AD.
In conclusion, these results are considered to suggest that a comprehensive neuropsychological assessment will differentiate the phase of cognitive aging, and predict the progression from MCI to AD. Therefore, the early diagnosis by neuropsychological differentiation and neuropsychological prediction will improve the effectiveness of therapeutic intervention.