Mild cognitive impairment (MCI) is the prodrome of the cognitive function declining before Alzheimer's disease or other dementia showed up, the impairments of language, visuospatial relationship, attention, and memory included and instrumental activities of daily living (IADL) influenced. MCI is considered as a transitional stage between normal aging and mild dementia, and the patients with MCI has differently fluctuated cognitive functions in a period of time, such as from normal cognition to MCI or developing to dementia. The annual conversion rate (ACR) of older adults with normal cognition developed to MCI is 30%, and 5% in clinical setting, and community, respectively. Not all of patients with MCI develop to Alzheimer's disease, the reversion of patients with MCI to normal cognition exists. However, MCI is a significant risk factor. The ACR of older adults with normal cognition or MCI developed to dementia is 1-2%, and 5-15%, respectively; moreover, about half of patients with MCI developed to dementia in 5 years. Cognitive training (CT) improves cognitive functions with repetitive practicing standardized cognitive tasks of specific cognitive functions, such as memory, attention, or problem solving. CT has widely defined including strategy training, in which contained cognitive exercise, strategy indicating and practicing to reducing cognitive impairments and improving performances. CT is more effective for MCI. Recently, computer-based CT (CCT) with many advantages gradually replaced the traditional paper-pencil form. Brief systematic review showed that the computer-based intervention had positive effects on behavioral symptoms, such as depression and anxiety, in patients with MCI and/or dementia. Previous studies demonstrated that computer-based intervention exhibited moderate treatment effects on overall cognitive functions in patients with MCI, and also had positive effects on learning, short-term memory, and behavioral symptoms. Older people with cognitive impairments is expected to increase by global aging. It is important for improving or maintaining cognitive functions of older adults with MCI. The efficacy of the CCT on cognitive functions, neuropsychiatric symptoms, daily functions, and brain activated imaging of the magnetoencephalography (MEG) of in older adults with MCI is worth to explore for busy clinical practice.
The study design was a prospective and single-blinded randomized controlled trial. 36 participants with MCI were recruited and demographic data (age, gender, education level /years of education, marriage status etc.) were also collected. The MCI participants underwent the comprehensive review at baseline including neuropsychological assessment and Magnetic Resonance Imaging or Computerized Tomogram. Randomization treatment assignment will be generated by the random number table and assign the patient's intervention group accordingly. Sealed opaque envelopes containing the CCT group, or the dosage-matched control group sheets will be prepared and given to the therapists. Based on the t-test effect size of index d 1.00 indicates, an estimated 17 participants in each group will be required for a power of 0.80 with a two-sided type I error of 0.05. Considering the 5% (q) drop rate, we will need to recruit 18 participants (N/1-q) for each group. The participants were randomly allocated to either the CCT group (18 participants) or the dosage-matched control group (18 participants) with individualized intervention for 30 minutes a day, 3 times a week for 4 consecutive weeks. Clinical outcome measures, and the imaging of the MEG were administered at pre- treatment, post-treatment and 1-month follow-up for further analysis. Statistical analysis was performed using Statistical Package for the Social Sciences (SPSS) version 19.0. In statistical testing, two-sided p value ≤ 0.05 was considered statistically significant. The distributional properties of continuous variables were expressed by mean ± standard deviation (SD), categorical variables were presented by frequency and percentage. The differences in the distributions of continuous variables, categorical variables between the treatment and control groups were examined using two-sample t-test, Wilcoxon rank-sum test (or Mann-Whitney U test), and chi-square test. In addition, the minimum norm estimates (MNE), source-based time-frequency analysis, cross-frequency coupling, and functional connectivity were used to explore the differences of the activation of brain functions in participants between different treatment groups. The t-test was used to explore the differences of reaction time, rate of correction, and physical signals in stimulus reaction test of the MEG between in participants between different treatment groups. The correlation statistics was used to explore relationships between the scores of outcome measurements and the physical signals.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Enrollment
7
participants will be trained 30 minutes/day, 3 days/week for 4 consecutive weeks.
participants will receive craft activities of occupational therapy for 30 minutes/day, 3 days/week for 4 consecutive weeks.
Taipei Hospital, Ministry of Health and Welfare
New Taipei City, Taiwan
Change scores of Quick Mild Cognitive Impairment screen
The Quick Mild Cognitive Impairment (Qmci) screen , a performance test, contains 6 subtests: Orientation, Registration, Clock Drawing, Delayed Recall, Verbal Fluency, and Logical Memory. The Qmci can be administered and scored in less than 5 min. The Qmci was validated with sound reliability and validity. The Qmci screen scores ranged from 0 to 100, with a higher score indicating greater cognitive function.
Time frame: Baseline, 1 month, 2 months
Change scores of Montreal Cognitive Assessment
The Montreal Cognitive Assessment (MoCA), a performance test, is a standardized and validated tool designed to measure cognitive functions in visuospatial/executive, naming, memory, attention, language, abstraction, delayed recall, and orientation. The MoCA adds 1 score for those whose educational level ≤ 12 and scores ranged from 0 to 30, with a higher score indicating greater cognitive function.
Time frame: Baseline, 1 month, 2 months
Change scores of Contextual Memory Test
The Contextual Memory Test is a standardized tool to measure the short-term and long-term retrospective memory and metacognition. The immediate and delayed memory is administrated by remembering 20 items related to daily context in 90 seconds. The scores of memory score, perceptual memory scores, and strategy-use scores were recorded.
Time frame: Baseline, 1 month, 2 months
Change scores of Color Trail Test
The Color Trail Test has A, and B parts. Participants needs to orderly connect randomized arrangement numbers in part A, and orderly and alternately connect randomized arrangement numbers in different colors in part B. The finished time and amounts of hint, miss, color miss, and near miss were recorded.
Time frame: Baseline, 1 month, 2 months
Change scores of Digits Span Tasks-forward and backward
The longest digits of forward and backward are 10 and 9, respectively. The total scores are 10 and 9, with a higher score indicating greater digit span memory.
Time frame: Baseline, 1 month, 2 months
Change scores of Cancellation Test
The Cancellation Test presents 10 Arabic numerals (0-9) for 30 digits per row (8 rows) with 2 target numerals (2, 8) in 45 seconds. The amounts of correction and miss were recorded.
Time frame: Baseline, 1 month, 2 months
Change scores of Pattern Comparison
The Pattern Comparisons presents 30 pairs of figures for distinguishing the same or not in 30 seconds. The amounts of correction, miss and total answers were recorded.
Time frame: Baseline, 1 month, 2 months
Change scores of Everyday Memory Questionnaire
Everyday Memory Questionnaire is a self-rated memory function questionnaire to reflect the frequency of memory miss in daily life. The frequency of memory miss, such as less than 1 time in 1-month, 2-3 times in 1-month, 1 time in 1 week, 2-6 times in 1 week, and more than 1 time in 1 day, in each situation scores ranged from 0 to 4 in 13 situations.
Time frame: Baseline, 1 month, 2 months
Change scores of Neuropsychiatric Inventory Questionnaire
The Neuropsychiatric Inventory Questionnaire (NPI-Q) measures symptoms severity and caregiver distress in 12 domains, such as apathy/indifference, appetite/eating problems, disinhibition, agitation/aggression, motor disturbance, anxiety, irritability, nighttime behaviors, depression/dysphoria, delusions, elation/euphoria, and hallucinations. The symptoms severity in each domain scores ranged from 1 to 3, with a higher score indicating more severe symptoms severity. In addition, the caregiver distress in each domain scores ranged from 0 to 5, with a higher score indicating more distress for caregiver.
Time frame: Baseline, 1 month, 2 months
Change scores of Brief University of California San Diego (UCSD) Performance-based Skills Assessment
The Brief University of California San Diego (UCSD) Performance-based Skills Assessment (UPSA-B) contains 2 aspects: financial skills, and communication skills. The UPSA-B can be administered and scored in 10-15 min and used to measure participants how to administrate daily activities and do it how well. The UPSA-B scores ranged from 0 to 100, with a higher score indicating greater daily function.
Time frame: Baseline, 1 month, 2 months
Change scores of Disability Assessment for Dementia Questionnaire (DAD)
The DAD contains 11 items of 3 domains: basic activity of daily living (dressing, hygiene, continence, eating), instrumental activity of daily living (meal preparation, telephoning, going on an outing, finance and correspondence, medications, and housework), and leisure activity (leisure). The scoring divides into 3 parts to measure about the initiation, planning and organization, and effective performance, and the scores of each part transforms to percentage for calculation. The higher percentage of each part indicates the less impairment in activities of daily living.
Time frame: Baseline, 1 month, 2 months
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