Prevalence of Falls and Fractures in Alzheimer's Patients Compared to General Population

Meta-Analysis-Based Comparison of Annual Fall Risk between Older Adults with Alzheimer's Disease and Mild Cognitive Impairment

Background

Falls are a primary cause of injuries and hospitalization in older adults. It has been reported that cognitive impairments and dementia can increase fall risk in the older population; however, it remains unknown if fall risk differs among subgroups of dementia. This meta-analysis summarized previous studies reporting the annual fall risk of people with Alzheimer's disease (AD) or mild cognitive impairment (MCI) and compared the fall risk between these two groups of people with dementia.

Methods

Thirty-five studies enrolling 7844 older adults with AD or MCI were included. The annual fall prevalence and average number of falls of the included studies were meta-analyzed and compared by random-effects models with inverse variance weights.

Results

The annual fall prevalence in people with AD (43.55%) was significantly higher than MCI (35.26%, p < 0.001). A χ2 test indicated that the pooled fall prevalence is significantly higher in people with AD than MCI χ2 = 158.403, p < 0.001). Additionally, the yearly average number of falls in AD was higher than in MCI (1.30 vs 0.77 falls/person).

Conclusions

The results showed that older people with AD experience a higher annual fall prevalence with a larger number of falls than older adults with MCI. The results suggested that the fall risk measurements should be reported separately between people with AD and MCI. The findings could provide preliminary guidance for the identification of individuals with dementia who experience a high fall risk.

Reproducibility of isokinetic measures of the knee and ankle muscle strength in community-dwelling older adults without and with Alzheimer's disease

BACKGROUND

To interpret changes of muscle strength in older adults with Alzheimer's disease (AD), determining the reliability of outcome measures is necessary. Therefore, the purpose of the present study was to investigate the relative and absolute intra-rater reliability of concentric isokinetic measures of the knee and ankle muscle strength in community-dwelling older adults without and with AD in the mild and moderate stages.

METHODS

A methodological study was conducted. The participants were submitted to two isokinetic evaluations with an interval of three to seven days. The evaluations consisted of knee extension and flexion at 60°/s (five repetitions) and 180°/s (15 repetitions) and plantar flexion and dorsiflexion of the ankle at 30°/s (five repetitions). The measures of interest were peak torque, average peak torque and total work. The intraclass correlation coefficient two-way mixed model of a single-measure (ICC_3,1), standard error of measurement (SEM) and minimal detectable change at the 95% confidence interval (MDC₉₅) were calculated. The ICC_3,1 was interpreted based on Munro's classification. Standard error of measurement and MDC₉₅ were analyzed in absolute and relative values (percentage of error [SEM%] and change [MDC₉₅%]).

RESULTS

A total of 62 older adults were included and allocated to the three groups: mild-AD (n = 22, 79.9 years, 15 female and seven male), moderate-AD (n = 20, 81.6 years, 15 female and five male) and without-AD (n = 20, 74.3 years, 10 female and seven male). The ICCs_3,1 of the measures of knee were high/very high in the three groups (0.71-0.98). The ICCs_3,1 of the measures of ankle were high/very high in the mild-AD group (0.78-0.92), moderate/high/very high in the moderate-AD group (0.63-0.93) and high/very high in the group without-AD (0.84-0.97). The measurements of knee extensors at 60°/s, knee extensors (peak torque and total work), with the exception of peak torque in the mild-AD group, and flexors (average peak torque) at 180°/s, and ankle dorsiflexors at 30°/s had the lowest of SEM% and MDC95% in the three groups.

CONCLUSION

Concentric isokinetic measures are reliable for the assessment of knee and ankle muscle strength in community-dwelling older adults without and with AD in the mild and moderate stages.

Genome-wide association of polygenic risk extremes for Alzheimer's disease in the UK Biobank

In just over a decade, advances in genome-wide association studies (GWAS) have offered an approach to stratify individuals based on genetic risk for disease. Using recent Alzheimer's disease (AD) GWAS results as the base data, we determined each individual's polygenic risk score (PRS) in the UK Biobank dataset. Using individuals within the extreme risk distribution, we performed a GWAS that is agnostic of AD phenotype and is instead based on known genetic risk for disease. To interpret the functions of the new risk factors, we conducted phenotype analyses, including a phenome-wide association study. We identified 246 loci surpassing the significance threshold of which 229 were not reported in the base AD GWAS. These include loci that showed suggestive levels of association in the base GWAS and loci not previously suspected to be associated with AD. Among these, there are loci, such as IL34 and KANSL1, that have since been shown to be associated with AD in recent studies. We also show highly significant genetic correlations with multiple health-related outcomes that provide insights into prodromal symptoms and comorbidities. This is the first study to utilize PRS as a phenotype-agnostic group classification in AD genetic studies. We identify potential new loci for AD and detail phenotypic analysis of these PRS extremes.

Association Between Pain with Disability in the Elderly with Dementia

Background: Elderly is one of the most important and critical periods of life, and paying attention to the issues and problems of this period is very important. Objectives: The present study was performed to investigate the relationship between pain and disability in the elderly with dementia in 2021. Methods: In the present cross-sectional descriptive study, 120 elderly people with dementia were included. The instruments used in the four sections were the demographic profile form, the P-APS pain observation tool, and Stanford Disability Questionnaire questions. the researcher identified the elderly with dementia by available sampling method and if the elderly with dementia were eligible and written informed consent was obtained from the elderly and their primary caregivers, the questionnaires were completed. Conditions of pain and disability were described by descriptive tests, and then the relationship between pain and the degree of disability in patients was analyzed by statistical analysis using SPSS16 software. Results: The results showed mean (SD) pain score was 14.45 (4.23), disability score was 12.75 (3.09), and fall score was 37 (30.8%). According to pain score status classification, 4 (3.3%) of the elderly had no pain, 8 (6.7%) had mild pain, 27 (22.5%) had moderate pain, and 81 (67.5%) had severe pain. There is a significant relationship between pain status and disability in the elderly with dementia. By increase in pain, the patients had more disability (P = 0.000, F = 79.971). Conclusions: As the pain increased, the disability of the elderly with dementia decreased. For this reason, preventive interventions are explained in this field.