Dementia in Older Adults With Intellectual Disabilities-Epidemiology, Presentation, and Diagnosis

Guidelines for dementia-related health advocacy for adults with intellectual disability and dementia: National Task Group on Intellectual Disabilities and Dementia Practices

Increasing numbers of adults with intellectual disabilities (ID) are living into old age. Though this indicates the positive effects of improved health care and quality of life, the end result is that more adults with ID are and will be experiencing age-related health problems and also exhibiting symptoms of cognitive impairment and decline, some attributable to dementia. Early symptoms of dementia can be subtle and in adults with ID are often masked by their lifelong cognitive impairment, combined with the benign effects of aging. A challenge for caregivers is to recognize and communicate symptoms, as well as find appropriate practitioners familiar with the medical issues presented by aging adults with lifelong disabilities. Noting changes in behavior and function and raising suspicions with a healthcare practitioner, during routine or ad hoc visits, can help focus the examination and potentially validate that the decline is the result of the onset or progression of dementia. It can also help in ruling out reversible conditions that may have similar presentation of symptoms typical for Alzheimer's disease and related dementias. To enable caregivers, whether family members or staff, to prepare for and advocate during health visits, the National Task Group on Intellectual Disabilities and Dementia Practices has developed guidelines and recommendations for dementia-related health advocacy preparation and assistance that can be undertaken by provider and advocacy organizations.

Down syndrome and dementia: Is depression a confounder for accurate diagnosis and treatment?

The past century has seen a dramatic improvement in the life expectancy of people with Down syndrome. However, research has shown that individuals with Down syndrome now have an increased likelihood of early onset dementia. They are more likely than their mainstream peers to experience other significant co-morbidities including mental health issues such as depression. This case study reports a phenomenon in which three individuals with Down syndrome and dementia are described as experiencing a rebound in their functioning after a clear and sustained period of decline. It is hypothesized that this phenomenon is not actually a reversal of the expected dementia trajectory but is an undiagnosed depression exaggerating the true level of functional decline associated with the dementia. The proactive identification and treatment of depressive symptoms may therefore increase the quality of life of some people with Down syndrome and dementia.

Taking each day as it comes: staff experiences of supporting people with Down syndrome and Alzheimer's disease in group homes

BACKGROUND

Disability staff are being increasingly required to support adults with Down syndrome who develop Alzheimer's disease. They have little understanding of the nature of care required, and may lack input from aged care and dementia services, which lack knowledge of intellectual disability. The aim of this study was to report on the experiences of disability staff in group homes supporting residents with Down syndrome and Alzheimer's disease in relation to their under understanding of what was happening to these residents, their responses to them, and how they felt about their support role.

METHOD

Disability support staff for nine adults with Down syndrome who had a diagnosis of Alzheimer's disease were interviewed twice, over intervals of 6-9 months. Interviews were transcribed and analysed for themes.

RESULTS

Three key themes emerged - (i) struggling to understand change, (ii) taking each day as it comes, and (iii) he's got a disability and that's our job.

CONCLUSIONS

Staff had only limited understanding of how Alzheimer's disease impacted the adults with Down syndrome, their responses to changes were ad hoc, and they used strategies on a trial and error basis. They were committed to providing care, but at the risk of rejecting input and support. The need for collaboration across disability, and aged and disability care was evident to facilitate aging-in-place and planned care transitions.

Dementia in intellectual disability

PURPOSE OF REVIEW

Dementia is emerging as a significant condition in the population with intellectual disability. This review is aimed at clinicians working in the field. We revisit what is known on the subject and expand on this with results from recent research. The emphasis of this review is on the clinical research rather than laboratory or molecular research.

RECENT FINDINGS

Research has encompassed all aspects of dementia in intellectual disability, from epidemiology, assessment and diagnosis, through to management. There remains a lack of evidence concerning both pharmacological and nonpharmacological treatment of dementia in people with intellectual disability. Recent research has tended to focus on dementia in Down syndrome.

SUMMARY

More research is necessary in order to translate improvements in the understanding of the neuropathology of intellectual disability and dementia into effective treatments. There is also a need to investigate the optimum environment in which to provide holistic care for individuals affected.

A prospective 14-year longitudinal follow-up of dementia in persons with Down syndrome

BACKGROUND

To examine dementia characteristics, age at onset and associated comorbidities in persons with Down syndrome.

METHOD

Seventy-seven people with Down syndrome aged 35 years and older were followed longitudinally. The diagnosis of dementia was established using the modified International Classification of Diseases, Tenth Revision (ICD-10) criteria and a combination of objective and informant-based tests. Cognitive tests included the Test for Severe Impairment and the Down Syndrome Mental Status Examination; adaptive behaviour was measured using the Daily Living Skills Questionnaire. The Dementia Questionnaire for Mental Retarded Persons (DMR) was added to the test battery in 2005 and this study includes follow-up data for this instrument.

RESULTS

Over the 14-year period the average age of diagnosis at 55.41 years (SD = 7.14) was in the higher range of previously reported estimates (51-56 years) and a median survival of 7 years after diagnosis. Persons with dementia in the sample were significantly older than persons without dementia. The presence of dementia was also associated with epilepsy and sensory impairments. Among instruments the DMR appeared most sensitive to tracking change in symptoms over time before diagnosis.

CONCLUSION

The previously reported high risk levels for dementia among people with Down syndrome was confirmed in these data as was the value of the instruments utilised in tracking decline and helping to confirm diagnosis even in persons with severe intellectual disability.

Dementia in people with intellectual disability: insights and challenges in epidemiological research with an at-risk population

The population with intellectual disability (ID) is ageing, but age-related health concerns such as dementia have received little research attention thus far. We review evidence regarding the prevalence and incidence of dementia in people with ID, and discuss some possible explanations for an increased risk, such as shared genetic risk factors, co-morbid physical and mental disorders, lifestyle factors, trauma, and lowered brain reserve. We discuss practical and theoretical challenges facing researchers in this field, before highlighting the implications of findings to date for future research and clinical care. Research on dementia in this at-risk population has the potential to help us understand dementia in general and to improve services for this group of vulnerable individuals.

A systematic review on assessment instruments for dementia in persons with intellectual disabilities

AIM

This work describes an extensive systematic literature review on assessment instruments for dementia in persons with intellectual disability (ID). Existing instruments for the detection of dementia in persons with ID were collected and described systematically. This allows a direct and quick overview of available tools. Additionally, it contributes to the availability and usability of information about these instruments, thus enhancing further developments in this field.

METHODS

A systematic literature search in five databases (CINAHL, PsycInfo, PubMed, Scopus, and Web of Science) was conducted. In order to include gray literature an invisible college approach was used. Relevant studies were identified and selected using defined inclusion and exclusion criteria. After the selection process all instruments were coded and classified. It was determined which concepts they assess, whether they were especially developed or adapted for persons with ID, and whether they were designed to assess dementia. The selection of relevant papers, as well as the coding of instruments was done independently by two researchers.

RESULTS

In total, 97 records met the search criteria. Out of these, 114 different instruments were extracted. There were 79 instruments to be completed by the person with ID, and 35 informant-based instruments. Additionally, four test batteries were found. Some of these instruments were neither designed for the assessment of dementia, nor for persons with ID.

CONCLUSIONS

There are a variety of different tools used for the assessment of dementia in ID. Nevertheless, an agreed-upon approach or instrument is missing. Establishing this would improve the quality of assessment in clinical practice, and benefit research. Data collected would become comparable and combinable, and allow research to have more informative value.

Incidence of dementia in older adults with intellectual disabilities

Dementia may be more common in older adults with intellectual disability (ID) than in the general population. The increased risk for Alzheimer's disease in people with Down syndrome (DS) is well established, but much less is known about dementia in adults with ID who do not have DS. We estimated incidence rates from a longitudinal study of dementia in older adults with ID without DS and compared them to general population rates. 222 participants with ID without DS aged 60 years and older were followed up an average of 2.9 years later to identify those who had declined in functional or cognitive abilities. Those who screened positive had a comprehensive assessment for dementia, diagnosed using ICD 10 and DSM IV criteria. 134 participants who did not have dementia at initial assessment were alive and interviewed at follow up; 21 (15.7%) were diagnosed with dementia. Overall incidence rate for those aged ≥ 60 was 54.6/1000 person years (95% CI 34.1-82.3). The highest incidence rate (97.8/1000 person years) was in the age group 70-74. Standardised incidence ratio for those aged ≥ 65 was 4.98 (95% CI 1.62-11.67). Incidence of dementia in older people with intellectual disabilities are up to five times higher than older adults in the general population. Screening may be useful in this population given the high incident rates, particularly as more effective treatments become available. Studies to explore the underlying aetiological factors for dementia associated with intellectual disability could help to identify novel protective and risk factors.

Older adults with intellectual disability

PURPOSE OF REVIEW

Improvements in health and social care for people with intellectual disability have led to a dramatic increase in the life expectancy of this population, resulting in a large and growing number of older adults with intellectual disability. They are at risk of age-related mental disorders such as dementia and continue to present with high rates of mental illness.

RECENT FINDINGS

Recent research with older adults with intellectual disability has included physical health issues that may affect mental well being, and biological and clinical features of dementia in people with Down syndrome. Two key clinical trials of memantine and antioxidants for dementia in Down syndrome showed that these treatment options were ineffective in the short term. Other research focussed on environmental and psychosocial issues (including carer issues) and end-of-life care.

SUMMARY

Improved mental well being requires effective management of mental illness and co-morbid physical health problems as well as consideration of environmental and social issues. Biological research has identified potential treatments for age-related decline, which has led to the development of medication trials. Despite disappointing results, two recent medication trials showed that randomized controlled trials are feasible in older people with intellectual disabilities - a group who are often excluded from trials.

The role of nurses in meeting the health care needs of older people with intellectual disabilities: a review of the published literature

People with intellectual disabilities are now living longer and as a consequence are likely to have greater physical and mental health needs compared to the general population. Nurses may have a crucial role to play in meeting such needs, although it is unclear whether nurses are prepared for this role. This review of the available literature found little evidence of nurses undertaking effective interventions in meeting the health needs of older people with intellectual disabilities in the UK and Ireland. Nurses have been alerted to the increase in numbers of older people with intellectual disabilities and offered some direction on their future role in this area. Most of the available literature is based mainly on informed opinion rather than research findings.

Experiences of supporting people with Down syndrome and Alzheimer's disease in aged care and family environments

BACKGROUND

Research addressing the experiences of families of adults with Down syndrome and Alzheimer's disease in seeking diagnosis and gaining support is limited. The aim of this study was to gain a greater understanding of these processes by exploring the experiences of families and carers in supporting people with Down syndrome and Alzheimer's disease who had lived most or all of their lives with family.

METHOD

Three detailed case studies were created from multiple data sources, and then analysed thematically.

RESULTS

Families of adults with Down syndrome experienced stress and confusion as they negotiated a service system poorly equipped to meet their needs and professionals more focused on longstanding disability than the recent diagnosis of Alzheimer's disease. Such overshadowing led to mismanagement by services.

CONCLUSIONS

This research advances understandings of the support needs of people with Down syndrome and Alzheimer's disease and their families. It exposes gaps in the service system.

Health and functional status of adults with intellectual disability referred to the specialist health care setting: a five-year experience

Aims and Method. The Developmental Disability Database in the Department of Rehabilitation Medicine at a metropolitan hospital was audited for observations on adults with Intellectual Disability living in the local region (total population 180,000) who were seen in an identified multidisciplinary specialist clinic, during 2006-2010. Results. There were 162 people (representing half the known number of adults with Intellectual Disability living in the region): 77 females, 85 males, age range 16-86 years. The most common complex disabilities referred to the specialists in this clinic were epilepsy (52%), challenging or changing behavior (42%) and movement disorders (34%). Early onset dementia was a feature of the group (7%). The prevalence of prescription of medications for gastro-oesophageal reflux was high (36%) and similar to the numbers of people taking psychotropic medications. The rates of chronic cardiovascular disease (2%), chronic respiratory disease (10%) and generalised arthritis (11%) were low overall, but did rise with increasing age. Conclusions. Complex neurological disabilities are common, and chronic medical illnesses are uncommon in adults with Intellectual Disability referred to specialist clinicians in this region. A combined, coordinated, multidisciplinary clinic model addresses some of the barriers experienced by adults with Intellectual Disability in the secondary health system.

Prevalence of Depression and Dementia among Adults with Developmental Disabilities in Manitoba, Canada

Study Objective. To estimate and compare the prevalence of dementia and depression among adults with and without developmental disabilities (DDs). Methods. We linked data from several provincial administrative databases to identify persons with DDs. We matched cases with DD with persons without DD as to sex, age, and place of residence. We estimated the prevalence of dementia and depression and compared the two groups using the Generalized Estimating Equations (GEEs) technique. Results. The estimated prevalence of depression and dementia among younger adults (20-54) and older adults (50+) with DD was significantly higher than the estimated rates for the matched non-DD group (Depression: younger adults: RR = 2.96 (95% CI 2.59-3.39); older adults: RR = 2.65 (95% CI 1.84-3.81)), (Dementia: younger adults: RR = 4.01 (95% CI 2.72-5.92); older adults: RR = 4.80 (95% CI 2.48-9.31)). Conclusion. Significant disparities exist in mental health between persons with and without DDs.

Quality outcomes in group home dementia care for adults with intellectual disabilities

BACKGROUND

Dementia, as a public health challenge, is a phenomenon vexing many care organisations providing specialised residential and family supports for older adults with intellectual disabilities. With increasing survivorship to ages when risk is greatest, expectations are that many more adults in service will present with cognitive decline and diagnosed dementia as they grow older. As persons with dementia present with new needs, there is often a call for a reorientation of services. With respect to residential supports, agencies may need to adapt current methods of care, with particular attention to providing care in small group homes. However, dementia-related care also must be quality care and applicable standards need to be met.

METHOD

Reviewed were relevant policy and practice organisational guidelines and applied research literature addressing components of care and service provision that are critical to quality care and that were consistent with professional practice.

RESULTS

Examined were the nuances and contributing factors of quality dementia care and it was proposed that quality of care criteria need to be universally applicable and serve as a framework for adapting extant residential environments and make them 'dementia-capable'.

CONCLUSIONS

It is proposed that efforts to evaluate dementia-related care provision with respect to quality need to consider quality of care provision components such as (1) clinically relevant early and periodic assessment; (2) functional modifications in the living setting; (3) constructive staff education and functionality for stage-adapted care; and (4) flexible long-term services provision that recognises and plans for progression of decline and loss of function.