[Functional independence level and cognitive deficit in elderly individuals with Alzheimer's disease]

Association between aspirin use and risk of dementia: a systematic review and meta-analysis

PURPOSE

Dementia and Alzheimer's disease (AD) pose significant challenges to public health globally with no effective treatment strategies available. Therefore, the research focuses on developing effective prophylaxis to prevent the onset of these diseases. Recent studies have suggested that low-dose aspirin may help reduce the risk of dementia. Nonetheless, evidence regarding the correlation between aspirin consumption and the onset of dementia and AD is limited. This review aims to provide an up-to-date summary of the existing evidence and evaluate the association between aspirin and the onset of dementia and Alzheimer's disease.

METHODS

A systematic search of PubMed, Embase, Web of Science, PsycINFO, and CINAHL databases was conducted to find eligible studies published until April 2023. A random-effects meta-analysis of the eligible studies was then performed to assess the link between aspirin use and the onset of dementia and Alzheimer's disease. Additionally, we conducted subgroup analyses to evaluate the overall effect of low-dose (75-100 mg) aspirin consumption on the onset of dementia and AD.

RESULTS

A total of 875 studies were identified, with only 22 meeting the inclusion criteria. There was no statistically significant impact of aspirin consumption on the onset of dementia (HR 1.13, 11 studies) or Alzheimer's disease (HR 0.91, 3 studies). Additionally, subgroup analysis showed that taking low doses of aspirin (75-100 mg) did not significantly affect the onset of either dementia (HR 0.96, 13 studies) or Alzheimer's disease (HR 0.85, 2 studies).

CONCLUSIONS

Aspirin use does not decrease the risk of dementia or AD, even when taken in low doses. However, the quality of the studies analyzed was inadequate, with only three randomized controlled trials included in the review. Future high-quality studies are needed to assess the effect of aspirin consumption on these diseases. These findings may assist clinicians in selecting appropriate prophylactic strategies for patients at risk of developing dementia and AD.

Associação entre limitação funcional e deficit cognitivo em pacientes idosos hospitalizados

Resumo Introdução A hospitalização é reconhecida como um fator de risco para o declínio funcional do idoso, bem como para o declínio cognitivo. Entretanto, a associação entre essas variáveis ainda não é bem estabelecida, sobretudo no contexto hospitalar. Objetivo Verificar a associação entre deficit cognitivo e limitação funcional em atividades básicas da vida diária entre idosos hospitalizados. Método Estudo seccional, com idosos internados em dois hospitais públicos. Foi verificada a presença de deficit cognitivo por meio do teste de rastreio Mini Exame do Estado Mental e a presença de limitação funcional pelo Índice Katz para Atividades Básicas de Vida Diária. Foi realizada análise descritiva da amostra e regressão logística, estimando-se os valores de odds ratio e respectivos intervalos de confiança (95%). Resultados A prevalência de deficit cognitivo foi de 51,5% (IC95%, 41,6-61,4) e 37,6% dos idosos apresentaram dependência em uma ou mais atividades básicas de vida diária. Os resultados mostraram que tanto o número de atividades comprometidas (p=0,002) quanto a classificação final do índice Katz (p=0,001) foram diferentes estatisticamente entre os grupos de idosos com e sem deficit cognitivo. Entre os idosos que eram dependentes parciais para as atividades, 14,9% apresentaram deficit cognitivo; já entre aqueles que eram dependentes totais, o valor foi de 13,9%. Os idosos dependentes nas atividades apresentaram 5,08 vezes (IC95%, 1,84-14,01) maior chance de deficit cognitivo. Conclusão: O deficit cognitivo foi associado à limitação funcional e os resultados colaboraram no direcionamento da sistematização da assistência precoce direcionada, a fim de minimizar perdas cognitivas e funcionais na hospitalização.

Identifying subtypes of mild cognitive impairment from healthy aging based on multiple cortical features combined with volumetric measurements of the hippocampal subfields

Background

Mild cognitive impairment (MCI) is subtle cognitive decline with an estimated 10-15% yearly conversion rate toward Alzheimer's disease (AD). It remains unexplored in brain cortical association areas in different lobes and its changes with progression and conversion of MCI.

Methods

Brain structural magnetic resonance (MR) images were collected from 102 stable MCI (sMCI) patients. One hundred eleven were converted MCI (cMCI) patients, and 109 were normal control (NC). The cortical surface features and volumes of subcortical hippocampal subfields were calculated using the FreeSurfer software, followed by an analysis of variance (ANOVA) model, to reveal the differences between the NC-sMCI, NC-cMCI, and sMCI-cMCI groups. Afterward, the support vector machine-recursive feature elimination (SVM-RFE) method was applied to determine the differences between the groups.

Results

The experimental results showed that there were progressive degradations in either range or degree of the brain structure from NC to sMCI, and then to cMCI. The SVM classifier obtained accuracies with 64.62%, 78.96%, and 70.33% in the sMCI-NC, cMCI-NC, and cMCI-sMCI groups, respectively, using the volumes of hippocampal subfields independently. The combination of the volumes from the hippocampal subfields and cortical measurements could significantly increase the performance to 71.86%, 84.64%, and 76.86% for the sMCI-NC, cMCI-NC, and cMCI-sMCI classifications, respectively. Also, the brain regions corresponding to the dominant features with strong discriminative power were widely located in the temporal, frontal, parietal, olfactory cortexes, and most of the hippocampal subfields, which were associated with cognitive decline, memory impairment, spatial navigation, and attention control.

Conclusions

The combination of cortical features with the volumes of hippocampal subfields could supply critical information for MCI detection and its conversion.

Observational Evidence of the Association Between Handgrip Strength, Hand Dexterity, and Cognitive Performance in Community-Dwelling Older Adults: A Systematic Review

BACKGROUND

Deterioration of hand motor function is a possible risk factor of cognitive impairment in older adults. Despite a growing body of research, a lack of clarity exists regarding the relationships. This review offers a synthesis of existing observational studies evaluating the associations of handgrip strength and hand dexterity with cognitive performance in community-dwelling older adults.

METHODS

PubMed, PsycINFO, and ScienceDirect were systematically searched (search dates: 1990-2016), and relevant articles were cross-checked for related and relevant publications.

RESULTS

Twenty-two observational studies assessed the association of handgrip strength or hand dexterity with cognitive performance; none evaluated handgrip strength and hand dexterity together. Handgrip strength was associated with global cognition, mostly assessed using the Mini-Mental State Examination, cross-sectionally and longitudinally. Also, one cross-sectional and three longitudinal studies found an association with cognitive domains, such as language, memory, visuospatial ability, working memory, and processing speed. Hand dexterity was only assessed cross-sectionally in four studies. These studies found an association with cognitive domains, such as executive function.

CONCLUSIONS

Although handgrip strength was associated with cognitive performance, it is unclear which variable at baseline affects the other in the long-term. Cross-sectional studies indicate an association between hand dexterity and cognitive performance, yet longitudinal studies are needed to elucidate this association. The interaction effects of both decreased grip strength and hand dexterity on cognitive performance is still unclear; therefore, future studies will need to consider the interaction of the three variables cross-sectionally and longitudinally.

Maintenance of functional capacity in cognitive stimulation subgroups

OBJECTIVES

To evaluate the improvement of the elderly's functional capacity before intervention in cognitive stimulation workshops, according to subgroups.

METHODS

uantitative study, by before and after evaluation, following during one year the cognitive stimulation intervention, conducted according to recommendations of NIC (Nursing Interventions Classification) Domain 3 - Behavior, Class P, Cognitive Therapy "interventions to reinforce or promote desirable behaviors or to change undesirable behaviors". Participants were 67 people, with ages between 60 and 88. The criteria for subgroups were: healthy= memory complaint and Mini Mental State Exam (MMSE) score above or equal to 26 (n = 20); low education level = memory complaint and up to 5 years of study (n = 11); depression = memory and humor complaint, and Geriatric Depression Scale (GDS) score ≥ 4 (n = 25); and the control group (n = 11), which did not receive the intervention, just the conventional treatment.

RESULTS

Although statistically significant differences have been observed in specific scores at each subgroup: MMSE (greater improvement in healthy elderly); GDS (greater improvement in the depression group); and the Word recall test (lower at the "low education level" group); it was noticed that at all intervention subgroups the functional capacity was maintained when compared to the control group.

CONCLUSIONS

The cognitive stimulation workshops were useful to the elderly, who received the nursing intervention, the cognitive therapy. It is recommended adoption of the intervention in specific subgroups, according to their own cognitive limitations.

Combined Cognitive Training vs. Memory Strategy Training in Healthy Older Adults

As mnemonic utilization deficit in older adults associates with age-related decline in executive function, we hypothesized that memory strategy training combined with executive function training might induce larger training effect in memory and broader training effects in non-memory outcomes than pure memory training. The present study compared the effects of combined cognitive training (executive function training plus memory strategy training) to pure memory strategy training. Forty healthy older adults were randomly assigned to a combined cognitive training group or a memory strategy training group. A control group receiving no training was also included. Combined cognitive training group received 16 sessions of training (eight sessions of executive function training followed by eight sessions of memory strategy training). Memory training group received 16 sessions of memory strategy training. The results partly supported our hypothesis in that indeed improved performance on executive function was only found in combined training group, whereas memory performance increased less in combined training compared to memory strategy group. Results suggest that combined cognitive training may be less efficient than pure memory training in memory outcomes, though the influences from insufficient training time and less closeness between trained executive function and working memory could not be excluded; however it has broader training effects in non-memory outcomes.

CLINICAL TRIAL REGISTRATION

www.chictr.org.cn, identifier ChiCTR-OON-16007793.

Percepção da funcionalidade nas fases leve e moderada da doença de Alzheimer: visão do paciente e seu cuidador

OBJETIVOS: Avaliar e comparar a percepção da funcionalidade de idosos com doença de Alzheimer (DA) em relação à percepção de seus cuidadores, bem como avaliar e comparar essa relação de acordo com o grau de comprometimento cognitivo desses idosos. MÉTODOS: Foi realizado estudo transversal em 20 idosos com DA e seus cuidadores, sendo aplicada a Medida de Independência Funcional (MIF) para avaliar a percepção da funcionalidade de acordo com o relato do idoso com DA e seu cuidador; foi aplicada a escala de avaliação clínica da demência (CDR) para avaliar o estadiamento clínico da demência, sendo considerados idosos com DA leve (CDR 1) e DA moderada (CDR 2). RESULTADOS: Comparada a percepção da funcionalidade da amostra total de idosos com DA e seus respectivos cuidadores, a média da MIF foi de 116,5 (dp=9,8) pontos, segundo a visão dos idosos, e a média foi de 88,5 (dp=19,0) pontos nas tarefas avaliadas pela MIF, de acordo com seus cuidadores (p<0,001). O mesmo padrão foi observado na comparação entre os idosos com DA leve e seus cuidadores, embora os itens "autocuidados" e "mobilidade da MIF" não tenham sido estatisticamente significativos. Já nos idosos com DA moderada, houve diferença significativa em todas as dimensões da MIF quando comparada a seus cuidadores. CONCLUSÃO: Idosos com DA subestimam suas dificuldades quando comparados com a percepção de seus cuidadores e, à medida que a gravidade da doença aumenta, há piora progressiva da percepção da sua funcionalidade.

Capacidade funcional de idosos institucionalizados com e sem doença de Alzheimer

INTRODUÇÃO: A longevidade da população trouxe à tona doenças de natureza crônica e degenerativa, como a doença de Alzheimer. Esta doença acentua as alterações fisiológicas do envelhecimento, alterando a capacidade da pessoa para cuidar de si mesma, produzindo grande dependência. OBJETIVO: Comparar a capacidade funcional de idosos institucionalizados com e sem a doença de Alzheimer. METODOLOGIA: Estudo transversal do qual participaram 201 idosos residentes em quatro instituições públicas de longa permanência para idosos, divididos em grupo experimental com 20 idosos com doença de Alzheimer e grupo controle com 181 idosos sem a doença. Foram obtidos os dados sociodemográficos, e os idosos foram submetidos a avaliação funcional pelo índice de Barthel. RESULTADOS: A maioria dos residentes era do gênero feminino em ambos os grupos; o grupo experimental apresentou maior idade (p=0,002), menor tempo de institucionalização (p=0,01) e dependência (p=0,01) em comparação aos idosos sem a doença. CONCLUSÃO: Os idosos institucionalizados com doença de Alzheimer apresentam menor capacidade funcional que os idosos sem a doença.

Nutritional assessment of institutionalized elderly

Objective:

To define the nutritional profile of institutionalized elderly individuals.

Methods:

Comparative correlation and quantitative field study conducted in a Long-Stay Institution in Sao Paulo (SP), Brazil, between December 2010 and January 2012. To define nutritional diagnosis, data were collected from patient files, such as body mass index, circumferences, triceps skinfold, muscle area of the arm, thickness of the adductor pollicis, handgrip strength, and biochemical test results. The anthropometric variables were presented as mean, standard deviation, and percentages, and were grouped by gender and stratified by age. The level of statistical significance was p<0.05.

Results:

One hundred and two elderly individuals were selected, and 84 were females. Excess weight was the most common anthropometric diagnosis in men (n=11; 61%), with the detection of protein depletion in those aged 70 years, and possible cases of sarcopenic obesity. All women were in good health conditions (n=84; 100%). However, in 27% (n=23) of them, protein depletion was evident.

Conclusion:

More anthropometric studies are necessary which would allow a definition of local reference standards, stratified by gender and age group. The difference between populations and factors, such as inclusion and exclusion criteria, and methodological characteristics, limit the use of international standards, interfering in the reliability of the nutritional diagnosis.

Cognitive, functional and behavioral assessment: Alzheimer's disease

A review of the evidence on cognitive, functional and behavioral assessment for the diagnosis of dementia due to Alzheimer's disease (AD) is presented with revision and broadening of the recommendations on the use of tests and batteries in Brazil for the diagnosis of dementia due to AD. A systematic review of the literature (MEDLINE, LILACS and SCIELO database) was carried out by a panel of experts. Studies on the validation and/or adaptation of tests, scales and batteries for the Brazilian population were analyzed and classified according to level of evidence. There were sufficient data to recommend the IQCODE, DAFS-R, DAD, ADL-Q and Bayer scale for the evaluation of instrumental activities of daily living, and the Katz scale for the assessment of basic activities of daily living. For the evaluation of neuropsychiatric symptoms, the Neuropsychiatric Inventory (NPI) and the CAMDEX were found to be useful, as was the Cornell scale for depression in dementia. The Mini-Mental State Examination has clinical utility as a screening test, as do the multifunctional batteries (CAMCOG-R, ADAS-COG, CERAD and MDRS) for brief evaluations of several cognitive domains. There was sufficient evidence to recommend the CDR scale for clinical and severity assessment of dementia. Tests for Brazilian Portuguese are recommended by cognitive domain based on available data.