Longitudinal Modeling of Functional Decline Associated with Pathologic Alzheimer's Disease in Older Persons without Cognitive Impairment

Association of Alzheimer's Disease and Other Neuropathologies With Functional Disability in Persons With and Without Dementia

BACKGROUND

Dementia results from multiple neuropathologies causing cognitive impairment sufficiently severe to affect functional status. However, these pathologies and functional impairment are common in persons without dementia. We examined the association of Alzheimer's disease (AD) and multiple other neuropathologies with instrumental and basic activities of daily living in persons with and without dementia.

METHODS

Participants were 1 509 deceased from the Religious Orders Study or Rush Memory and Aging Project. Pathologic AD and 3 other AD indices were examined, in addition to 4 non-AD neurodegenerative pathologies: cerebral amyloid angiopathy (CAA), hippocampal sclerosis, TDP-43, and Lewy bodies, and 4 cerebrovascular pathologies: gross- and microinfarctions, athero- and arteriolosclerosis. Functional assessment included Lawton and Katz Index Instrumental and Basic Activities of Daily Living (IADL and BADL). Ordinal regression models adjusted for age, sex, and education were used to examine the association of neuropathologies with IADL and BADL.

RESULTS

Alzheimer's disease and the other neuropathologies were associated with impaired IADL (all ps < .001) and with impaired BADL (ps < .01), except for atherosclerosis and CAA, which were not associated with BADL. The effects of most neuropathologies were largely affected by dementia. However, small effects on IADL remained for PHF-tau tangles after adjusting models for dementia. Direct effects of gross infarcts on IADL and BADL and of microinfarcts on BADL remained unchanged after adjusting the models for dementia.

CONCLUSIONS

Alzheimer's disease and all other neuropathologies are strongly associated with functional disability. The association of most neuropathologies with disability was eliminated or attenuated by dementia, except for gross infarcts and microinfarcts.

Exploring Factors Associated With Successful Nonpharmacological Interventions for People With Dementia

Background and purpose

Methods

Results

Conclusions

Trajectories of decline on instrumental activities of daily living prior to dementia in persons with mild cognitive impairment

OBJECTIVES

The main objective was to determine the trajectory of instrumental activities of daily living (iADL) decline in persons with mild cognitive impairment (MCI) who progressed towards dementia relative to persons with MCI who remained stable.

METHODS/DESIGN

At study entry, 121 participants met criteria for MCI. Based on the follow-up, 47 participants later converted to dementia and were identified as progressors. Sixteen participants, identified as decliners, presented a significant cognitive decline but did not reach the criteria for dementia within the study timeframe. Stable MCI remained cognitively stable during the 5-year follow-up; n = 58. Participants completed a yearly assessment using clinical tests/questionnaires, neuropsychological measures, and functional autonomy assessment until they met criteria for dementia. The average number of months for the follow-up was 34.

RESULTS

Many years of stable performance followed by an accelerated decline just prior to diagnosis, was observed for complex activities for progressors. No change was found for stable MCI and a gradual linear decline characterized decliners. The housekeeping-related activities component showed a linear decline in progressors and did not change in stable and decliner MCI. We found a predictive model that includes significant predictors of dementia conversion with a high diagnostic accuracy the following year (area under the curve = 0.94 [95% confidence level; lower bound: 0.87, upper bound: 1]).

CONCLUSIONS

It is critical to assess iADL that reflect complex activities in the evaluation of MCI individuals as their impairment, combined with change on cognitive markers, indicates a higher risk of dementia progression 1 or 2 years later.

Functional outcome in home health: Do racial and ethnic minority patients with dementia fare worse?

Objectives

Evaluate the independent and interactive effects of dementia and racial/ethnic minority status on functional outcomes during a home health (HH) admission among Medicare beneficiaries.

Methods

Secondary analysis of data from the Outcome and Assessment Information Set [OASIS] and billing records in a non-profit HH agency in New York. Participants were adults ≥ 65 years old who received HH in CY 2017 with OASIS records at HH admission and HH discharge. Dementia was identified by diagnosis (ICD-10 codes) and cognitive impairment (OASIS: M1700, M1710, M1740). We used OASIS records to assess race/ethnicity (M0140) and functional status (M1800-M1870 on activities of daily living [ADL]). Functional outcome was measured as change in the composite ADL score from HH admission to HH discharge, where a negative score means improvement and a positive score means decline.

Results

The sample included 4,783 patients, among whom 93.9% improved in ADLs at HH discharge. In multivariable linear regression that adjusted for HH service use and covariates (R² = 0.23), being African American (β = 0.21, 95% confidence interval [CI]: 0.06, 0.35, p = 0.005) and having dementia (β = 0.51, 95% CI: 0.41, 0.62, p<0.001) were independently related to less ADL improvement at HH discharge, with significant interaction related to further decrease in ADL improvement. Relative to white patients without dementia, African American patients with dementia (β = 1.08, 95% CI: 0.81, 1.35, p<0.001), Hispanics with dementia (β = 0.92, 95% CI: 0.38, 1.47, p = 0.001) and Asian Americans with dementia (β = 1.47, 95% CI: 0.81, 2.13, p<0.001) showed the least ADL improvement at HH discharge.

Conclusion

Racial/ethnic minority status and dementia were associated with less ADL improvement in HH with independent and interactive effects. Policies should ensure that these patients have equitable access to appropriate, adequate community-based services to meet their needs in ADLs and disease management for improved outcomes.

Conhecimentos e sobrecarga do familiar cuidador frente ao paciente com demência

Resumo Objetivo Verificar o conhecimento do familiar cuidador frente ao paciente com demência e avaliar a sobrecarga proveniente do cuidado. Método Trata-se de pesquisa qualitativa, desenvolvida no ambulatório de um hospital de referência em neurologia na cidade do Recife, PE, Brasil. Os dados foram coletados por meio da entrevista semiestruturada, questionário sociodemográfico e da aplicação da Escala de Zarit, os dados foram tratados pela análise de conteúdo proposta por Bardin e discutidos de acordo com os constructos da problematização e autonomia de Paulo Freire. Os participantes assinaram o TCLE atestando o consentimento para a pesquisa Resultados Da análise das entrevistas com 17 familiares cuidadores, emergiram três categorias temáticas: desconhecimento sobre a doença, percepção do familiar cuidador frente às necessidades do paciente e sobrecarga familiar. Com a progressão da doença, torna-se imprescindível a presença do cuidador, entretanto a maioria não possui suporte necessário para assistir aos seus familiares. Conclusão O estudo verificou o despreparo e a dificuldade do cuidador com manejo de seus familiares que possuem alguma síndrome demencial. Assim, torna-se necessária a continuidade de mais produções sobre essa temática e suas repercussões na vida dos familiares cuidadores, a fim de auxiliar nas estratégias de promoção à saúde para essa população.

Religious Orders Study and Rush Memory and Aging Project

BACKGROUND

The Religious Orders Study and Rush Memory and Aging Project are both ongoing longitudinal clinical-pathologic cohort studies of aging and Alzheimer's disease (AD).

OBJECTIVES

To summarize progress over the past five years and its implications for understanding neurodegenerative diseases.

METHODS

Participants in both studies are older adults who enroll without dementia and agree to detailed longitudinal clinical evaluations and organ donation. The last review summarized findings through the end of 2011. Here we summarize progress and study findings over the past five years and discuss new directions for how these studies can inform on aging and AD in the future.

RESULTS

We summarize 1) findings on the relation of neurobiology to clinical AD; 2) neurobiologic pathways linking risk factors to clinical AD; 3) non-cognitive AD phenotypes including motor function and decision making; 4) the development of a novel drug discovery platform.

CONCLUSION

Complexity at multiple levels needs to be understood and overcome to develop effective treatments and preventions for cognitive decline and AD dementia.