Age-Specific Cutoff Scores on a T1-Weighted Axial Medial Temporal-Lobe Atrophy Visual Rating Scale in Alzheimer's Disease Using Clinical Research Center for Dementia of South Korea Data

BACKGROUND AND PURPOSE: Visual assessment of medial temporal-lobe atrophy (MTA) has been quick, reliable, and easy to apply in routine clinical practice. However, one of the limitations in visual assessments of MTA is the lack of widely accepted age-adjusted norms and cutoff scores for MTA for a diagnosis of Alzheimer's disease (AD). This study aimed to determine the optimal cutoff score on a T1-weighted axial MTA Visual Rating Scale (VRS) for differentiating patients with AD from cognitively normal elderly people. METHODS: The 3,430 recruited subjects comprising 1,427 with no cognitive impairment (NC) and 2003 AD patients were divided into age ranges of 50–59, 60–69, 70–79, and 80–89 years. Of these, 446 participants (218 in the NC group and 228 in the AD group) were chosen by random sampling for inclusion in this study. Each decade age group included 57 individuals, with the exception of 47 subjects being included in the 80- to 89-year NC group. The scores on the T1-weighted axial MTA VRS were graded by two neurologists. The cutoff values were evaluated from the area under the receiver operating characteristic curve. RESULTS: The optimal axial MTA VRS cutoff score from discriminating AD from NC increased with age: it was ≥as ≥1, ≥2, and ≥3 in subjects aged 50–59, 60–69, 70–79, and 80–89 years, respectively (all p < 0.001). CONCLUSIONS: These results show that the optimal cutoff score on the axial MTA VRS for diagnosing of AD differed according to the decade age group. This information could be of practical usefulness in the clinical setting.

Predictive Factors for Decline in Activities of Daily Living in Alzheimer's Disease Dementia with More than 2 Follow-up

BACKGROUND: Impairment in activities of daily living (ADL) is a major problem in Alzheimer's disease (AD), and is related to increased caregiver burden.The present study evaluated whether there are any components of initial dementia evaluation that could predict ADL decline in years follow-up. METHODS: The 32 subjects underwent more than two consecutive neuropsychological evaluation and maintained anti-dementia medication from the Ewha Dementia Cohort. The first clinical, neuropsychological test results, medial temporal atrophy rating and white matter ratings were correlated with the final ADL scores. The subjects were further divided into ADL-preserved and declined groups for the comparison depending on final ADL scores. RESULTS: The annual decline of the Korean Mini-mental status examination (K-MMSE) score was 1.5+/-1.2 and of the Seoul-instrumental ADL score was 6.1+/-4.6. The Factors correlated with the ADL at baseline were the clinical dementia rating, K-MMSE, memory function score and the total neuropsychological test score, left medial temporal lobe atrophy rating, and the neuropsychiatric total score. Only the neuropsychological component including total test, frontal and visuospatial function scores were statistically different between the two groups in the baseline evaluation. CONCLUSIONS: The result of our preliminary study emphasize the other study results that the initial cognitive and dementia status are the strong predictive factors not only for the initial ADL dysfunction but also for the ADL decline in years followed-up dementia cohort.