High prevalence of dementia among people with learning disabilities not attributable to Down's syndrome

The Incidence and Prevalence of Dementia Among Ontario Adults With and Without Intellectual and Developmental Disabilities

OBJECTIVES

There are more than 66,000 Ontario adults living with intellectual and developmental disabilities (IDD). While the risk of dementia is well established among those with Down Syndrome (DS), there is limited research in persons with IDD excluding DS (Non-DS IDD). This study aimed to compare the incidence and prevalence of dementia in Ontario adults with and without IDD over time and by demographic information.

METHODS

Administrative data were used to calculate and compare the annual age- and sex-adjusted cumulative incidence and period prevalence of dementia from fiscal years 2011/12 to 2020/21 in three cohorts: (1) Non-DS IDD, (2) DS, and (3) No IDD.

RESULTS

Compared to persons without IDD, cumulative incidence of dementia was on average 4.27 and 5.33 times higher in persons with Non-DS IDD and DS respectively and period prevalence of dementia was on average 4.87 and 5.93 times higher in persons with Non-DS IDD and DS respectively.

CONCLUSIONS

Given the increased rates of dementia within the IDD population, it is imperative that early dementia screening take place, appropriate health and social services are implemented and more actions are taken to delay the onset of dementia, while considering the needs of this population.

Couples with intellectual disability where one partner has dementia - a scoping review exploring relationships in the context of dementia and intellectual disability

Relationships and marriages between couples with intellectual disability are to be celebrated, as is the longer life expectancy now enjoyed by many with intellectual disability. However, dementia disproportionately affects people with intellectual disability, especially people with Down's syndrome. Research into experiences of couples without intellectual disability who are affected by dementia suggests that a relational perspective provides health and social care professionals with information to support the wellbeing of both partners. This dyadic perspective is missing for couples with an intellectual disability where one partner has dementia. There is currently no evidence base informing how each partner may best be supported. This scoping review, with three separate searches, aims to address this gap. The first search sought to establish if any studies had explored the experiences of couples with intellectual disability where one partner has dementia. After determining that no studies have been published to date, the review explores what is known about relationships in the context of dementia (n=8) and in the context of intellectual disability (n=10), in second and third searches. Different ways to approach care and support in relationships among partners, staff and other family members were identified and it was evident that support could act as a facilitator as well as a barrier to people and their relationships. While the lives of couples affected by dementia appeared to remain largely private, couples with intellectual disability had a high involvement of staff and family members in their life. Potential implications for future research with couples with intellectual disability affected by dementia are discussed, highlighting the importance of exploring how couples navigate emotional complexities and changes in their relationship, while understanding that the context in which the lives of people with intellectual disability take place and relationships happen is different.

Exposures and conditions prior to age 16 are associated with dementia status among adults in the United States Health and Retirement Study

Background

Dementia susceptibility likely begins years before symptoms. Early life has not been comprehensively tested for dementia associations.

Method

In the US Health and Retirement Study (normal baseline cognition; n=16,509; 2008-2018 waves), 31 exposures before age 16 were retrospectively assessed with ten-year incident cognitive status (dementia, impaired, normal). Using parallel logistic models, each exposure was tested with incident cognition, adjusting for sex, baseline age, follow-up, race/ethnicity, personal/parental education.

Result

14.5% had incident impairment and 5.3% had dementia. Depression was associated with 1.71 (95%CI:1.28,2.26) times higher odds of incident impairment, relative to normal cognition. Headaches/migraines were associated with 1.63 (95%CI:1.18,2.22) times higher odds of incident impairment. Learning problems were associated with 1.75 (95%CI:1.05,2.79) times higher odds of incident impairment. Childhood self-rated health of fair (1.86, 95%CI:1.27,2.64) and poor (3.39, 95%CI:1.91,5.82) were associated with higher incident dementia odds, relative to excellent.

Conclusion

Early life factors may be important for impairment or dementia, extending the relevant risk window.

Can neurodevelopmental disorders influence the course of neurodegenerative diseases? A scoping review

This scoping review aims at giving an overview of the possible influence of neurodevelopmental disorders (NDDs) on cognitive-behavioral neurodegenerative diseases (CBNDs). Based on the PRISMA-ScR checklist, it details the methods of NDDs screening, the identified NDDs-CBNDs associations, as well as the criteria and types of association. The last literature search was performed in June 2023. In the final study, 32 articles were included. Analysis first showed that NDDs were mainly detected through medical records screening. Second, the association of specific learning disorders and major or mild neurocognitive disorder due to Alzheimer's disease was the most investigated. Third, associations were mostly based on prevalence comparisons. Finally, 66 % of studies reported a positive association between NDDs and CBNDs. Notably, up to 67 % of positive associations were observed with atypical forms of certain CBNDs. Authors' interpretations suggest that NDDs could constitute a risk factor for CBNDs. However, the influence of NDDs on CBNDs still lacks evidence and biological support, possibly due to the heterogeneity of methods and criteria employed. Developing validated assessment tools for all NDDs and conducting cohort studies could be beneficial for research, and clinical practice. Indeed, this review also underlines the importance of adopting a life-span approach regarding CBNDs.

Dementia in Rare Genetic Neurodevelopmental Disorders: A Systematic Literature Review

BACKGROUND AND OBJECTIVES

Knowledge of young-onset Alzheimer disease in adults with Down syndrome has greatly improved clinical care. However, little is known about dementia in rare genetic neurodevelopmental disorders (RGNDs). In this review, a comprehensive overview is provided of reports on dementia and cognitive/adaptive trajectories in adults with RGNDs.

METHODS

A systematic literature review was conducted in Embase, Medline ALL, and PsycINFO on December 6, 2022. The protocol was registered in PROSPERO (CRD42021223041). Search terms for dementia, cognitive and adaptive functioning, and RGNDs were combined using generic terms and the Orphanet database. Study characteristics and descriptive data on genetic diagnosis, clinical and neuropathologic features, comorbidities, and diagnostic methods were extracted using a modified version of the Cochrane Data Extraction Template.

RESULTS

The literature search yielded 40 publications (17 cohorts, 23 case studies) describing dementia and/or cognitive or adaptive trajectories in adults with 14 different RGNDs. Dementia was reported in 49 individuals (5 cohorts, 20 cases) with a mean age at onset of 44.4 years. Diagnostics were not disclosed for half of the reported individuals (n = 25/49, 51.0%). A total of 44 different psychodiagnostic instruments were used. MRI was the most reported additional investigation (n = 12/49, 24.5%). Comorbid disorders most frequently associated with cognitive/adaptive decline were epilepsy, psychotic disorders, and movement disorders.

DISCUSSION

Currently available literature shows limited information on aging in RGNDs, with relatively many reports of young-onset dementia. Longitudinal data may provide insights into converging neurodevelopmental degenerative pathways. We provide recommendations to optimize dementia screening, diagnosis, and research.

Does the Person-Centered Care Model Support the Needs of Long-Term Care Residents With Serious Mental Illness and Intellectual and Developmental Disabilities?

Person-centered care approaches continue to evolve in long-term care (LTC). At the same time, these settings have faced increased challenges due to a more diverse and complex population, including persons with intellectual and developmental disabilities (IDD) and serious mental illness (SMI). This study examined the mental, social, and physical wellbeing of residents with different diagnoses, within a person-centered care model. It was hypothesized that individual wellbeing would be comparable among all residents, regardless of primary diagnosis. The study cohort was drawn from all admissions to long-term care facilities in the USA from 2011 to 2013. Data are based on admission, 3 and 6 month follow-up Minimum Data Set (MDS) 3.0 assessments. The groups examined included: schizophrenia, other psychotic disorders, IDD, dementia, and all others (i.e., none of the above diagnoses). The wellbeing outcomes were depression (mental), pain (physical), and behaviors (social). All residents experienced improvements in pain and depression, though the group without the examined diagnoses experienced the greatest gains. Behaviors were most prevalent among those with psychotic disorders; though marked improvements were noted over time. Improvement also was noted among persons with dementia. Behavior worsened over time for the three other groups. In particular, those with IDD experienced the highest level of worsening at 3-month follow-up, and continued to worsen. The results suggest person-centered care in US nursing homes provides the necessary foundation to promote mental and physical wellbeing in persons with complex needs, but less so for social wellbeing.

Behaviors Characteristic of Autism Spectrum Disorder in a Geriatric Cohort With Mild Cognitive Impairment or Early Dementia

INTRODUCTION

Autism spectrum disorder (ASD) represents a heterogenous cluster of clinical phenotypes that are classically diagnosed by the time of adolescence. The possibility of late-life emergence of ASD has been poorly explored.

METHODS

To more fully characterize the possibility of late-life emergence of behaviors characteristic of ASD in mild cognitive impairment and AD, we surveyed caregivers of 142 older persons with cognitive impairment from the University of Kentucky Alzheimer's Disease Center Longitudinal Cohort using the Gilliam Autism Rating Scale-2.

RESULTS

Participants with high autism index ratings (autism "possible/very likely," n=23) reported significantly (statistically and clinically) younger age at the onset of cognitive impairment than those who scored in the autism "unlikely" range (n=119): 71.14±10.9 vs. 76.65±8.25 (P=0.034). In addition, those in the autism "possible/very likely" group demonstrated advanced severity of cognitive impairment, indicated by the Clinical Dementia Rating Scale Sum of Boxes scores.

DISCUSSION

Data demonstrate that ASD behaviors may seem de novo of degenerative dementia and such behaviors are more prevalent in those with early onset dementia. Further work elucidating a connection between ASD and dementia could shed light on subclinical forms of ASD, identify areas of shared neuroanatomic involvement between ASD and dementias, and provide valuable insights that might hasten the development of therapeutic strategies.

Down syndrome and dementia: advances in the field

PURPOSE OF REVIEW

People with Down syndrome represent the world's largest population with a genetic risk for Alzheimer's disease. This review will provide a short summary of what is known and will include recent findings from the field.

RECENT FINDINGS

There has been an increasing focus on biomarker research in this population, with a number of studies presenting findings on promising new markers - Neurofilament Light (NfL) appears to be one such promising marker that has emerged. Imaging studies have increased our knowledge on the progression of Alzheimer's disease in this population.

SUMMARY

The inclusion of people with Down syndrome in dementia research is vital from a scientific and an equity perspective. Recent advances in the field can have further impact with multisite, cross country collaborative efforts. For this to happen, instruments need to be validated across language and cultures.

Prevalence of dementia in people with intellectual disabilities: Cross-sectional study

BACKGROUND

There are only a few studies of the prevalence of dementia in people with intellectual disability (ID) without Down syndrome (DS), and there is a large difference in the prevalences between reported studies. Moreover, the prevalence of mild cognitive impairment (MCI) in ID has not been reported. We aimed to evaluate the prevalence of dementia in adults of all ages and the prevalence of MCI in people with ID. Furthermore, we tried to clarify the differences depending on the various diagnostic criteria.

METHODS

The survey included 493 adults with ID at 28 facilities in Japan. The caregivers answered a questionnaire, and physicians directly examined the participants who were suspected of cognitive decline. Dementia and MCI were diagnosed according to ICD-10, DC-LD, and DSM-5 criteria.

RESULTS

The prevalence of dementia was 0.8% for the 45 to 54 years old group, 3.5% for the 55 to 64 years old group, and 13.9% for the 65 to 74 years old group in people with ID without DS. The prevalence of MCI was 3.1% for patients 45 to 54, 3.5% for patients 55 to 64, and 2.8% for patients 65 to 74 with ID without DS. DSM-5 was the most inclusive in diagnosing dementia and MCI in people with ID.

CONCLUSIONS

People with ID without DS may develop dementia and MCI at an earlier age and higher rate than the general population. Among the diagnostic criteria, DSM-5 was the most useful for diagnosing their cognitive impairment.

Behavior-Analytic Approaches to Working with People with Intellectual and Developmental Disabilities who Develop Dementia: a Review of the Literature

Behavior analysis has made contributions in the development of evidence-based interventions for people with intellectual and developmental disabilities (IDD), and there is a growing evidence base for behavior-analytic interventions for older adults with dementia. As there is an increased number of adults with IDD living to old age, and an increased prevalence of comorbid dementia in people with IDD, a review of the behavior-analytic contributions with this population is warranted. We searched Web of Science and PsycInfo and manually reviewed the last 20 years of five behavioral journals. Six behavior-analytic studies with people with IDD and dementia were identified, and all but one were published outside of core behavior-analytic journals. These articles were analyzed in terms of Baer, Wolf, and Risley's (Journal of Applied Behavior Analysis, 1, 91-97, 1968) seven dimensions of applied behavior analysis (ABA). The possible explanations and implications of these findings are discussed with consideration of the unique features of a comorbid diagnosis of IDD and dementia that may make it appropriate for increased focus in behavior-analytic research and practice.

Learning disability psychiatry – the future of services

Distinctions between mental illness and learning disability have existed since the last century (Pinel, 1801; Ireland, 1877). The conditions have been accepted as coexisting in the same individual since the beginning of this century (Kraepelin, 1902). More recent papers have investigated the frequency of their coexistence and concluded that most psychiatric disorders are more common in those with learning disability than the general population (Turner, 1989).

International Summit Consensus Statement: Intellectual Disability Inclusion in National Dementia Plans

The World Health Organization (WHO) has called for the development and adoption of national plans or strategies to guide public policy and set goals for services, supports, and research related to dementia. It called for distinct populations to be included within national plans, including adults with intellectual disability (ID). Inclusion of this group is important as having Down's syndrome is a significant risk factor for early-onset dementia. Adults with other ID may have specific needs for dementia-related care that, if unmet, can lead to diminished quality of old age. An International Summit on Intellectual Disability and Dementia, held in Scotland, reviewed the inclusion of ID in national plans and recommended that inclusion goes beyond just description and relevance of ID. Reviews of national plans and reports on dementia show minimal consideration of ID and the challenges that carers face. The Summit recommended that persons with ID, as well as family carers, should be included in consultation processes, and greater advocacy is required from national organizations on behalf of families, with need for an infrastructure in health and social care that supports quality care for dementia.

Gender differences in psychiatric diagnoses in older people with intellectual disability: a register study

BACKGROUND

Gender differences regarding psychiatric ill-health are well known in the general population. However, not much research is done on people with intellectual disability, and especially not among older people with intellectual disability.

METHODS

People with intellectual disability aged 55+ years in 2012 in Sweden were identified through a register containing information on those receiving support and service for this type of disability. The cohort comprised 3609 women and 4327 men with mean age 65 and 64 years, respectively. Information on psychiatric diagnoses was collected from the National Patient Register for the period 2002-2012. Potential gender differences were evaluated both for diagnostic categories (e.g. affective disorders) and single diagnoses (e.g. depressive episodes).

RESULTS

The most common diagnoses among women were in the diagnostic category affective disorders, and among men in psychotic disorders. The majority of both women (72%) and men (71%) had diagnoses in only one diagnostic category. Women were more likely than men to have at least one diagnosis of dementia (odds ratio 1.40, 95% confidence interval 1.06-1.83) or affective disorders (1.33, 1.21-1.58) during the study period. They were, however, less likely to have at least one diagnosis of alcohol/substance use related disorder (0.59, 0.43-0.80). No gender differences were found for diagnoses of psychotic (1.04, 0.86-1.27) or anxiety disorders (1.15, 0.94-1.40). Regarding single diagnoses, women were more likely than men to have had at least one diagnosis of unspecified nonorganic psychosis (1.75, 1.23-2.50), depressive episode (1.47, 1.19-1.82), recurrent depressive disorder (1.53, 1.06-2.22), other anxiety disorder (1.34, 1.06-1.69), or dementia in Alzheimer disease (2.50, 1.40-4.49), but less likely to be diagnosed with psychiatric and behavioral disorders due to use of alcohol (0.41, 0.27-0.61).

CONCLUSIONS

As in the general population, there seem to be gender differences with respect to several types of psychiatric diagnoses among older people with intellectual disability. More research is needed to establish if this is due to gender differences in the occurrence of disease, inclination to seek care, health care utilization patterns, or ability to correctly identify disorders.

A population-based cross- sectional study of social networks and demography in older compared with younger adults with learning disabilities

This report describes a comprehensive population-based study of people with learning disabilities aged 65 years or over, living in Leicestershire, UK (n = 134), compared with a randomly selected group of people with learning disabilities aged 20-64 years (n = 73). Older people with learning disabilities include equal numbers of men and women, unlike younger individuals where men predominate. This finding is in keeping with the general population, where women have a greater life span than men (i.e. women outlive men and so the ratio between men and women changes with age). The distribution of the degree of learning disabilities was more severe for younger as opposed to older people; this probably relates to a differential mortality rate. Differences were also found between the two groups with regard to the aetiology of learning disabilities. Fewer elderly people lived with relatives: the majority lived in residential care using both learning disabilities services and services designed for the general population of older people. The social networks of the older cohort were more restricted than those of the younger cohort, and they spent less time engaged in enjoyable social interactions and activities. This suggests that current services are not yet meeting the needs of this growing older population.

An evaluation of a Singing for the Brain pilot with people with a learning disability and memory problems or a dementia

This paper presents the findings from a pilot project introducing Singing for the Brain into care centres with people with a learning disability and a form of dementia or memory problem. Through participant observations, patient and staff feedback, there was strong support for the use of Singing for the Brain with this client group, with participants reporting high levels of enjoyment and engagement in the sessions. The potential for these sessions to support communication, memory, social engagement and choice was reported by staff and participants. Whilst anecdotal reports also suggested the sessions had a positive impact on elevating mood over a sustained period of time. The pilot sessions are discussed in reference to the regular sessions run for people with dementia and comparisons drawn across the two approaches. Further evidence is required to understand the potential impact on participant’s well-being from attending these sessions.

Group home care for adults with intellectual disabilities and Alzheimer’s disease

The growing numbers of individuals with intellectual disabilities affected by Alzheimer’s disease and related dementias has raised new challenges for community care providers. This article examines means of providing community group home-based care in a sample of care providers in five different countries. The aim is to identify trends that have emerged. Two samples of group homes for adults with intellectual disabilities affected by dementia were studied to determine: (1) what are the physical characteristics of the homes; (2) what physical environmental adaptations have been made in response to behavioral deterioration expressed by residents with dementia; and (3) what are the demands on staff resulting from dementia care. The first sample of group homes in five countries provided comparative international data on home designs, staffing, costs, and residents. The second sample, drawn from homes in the USA and the UK, provided data on the impact of dementia. Findings revealed staffing and design of homes varied but generally abided by general practices of dementia care; homes relied on existing resources to manage changes posed by dementia care; programmatic and environmental adaptations were implemented to address progression of dementia; and residents with dementia presented more demands on staff time with respect to hygiene maintenance and behavior management when compared to other residents not affected by dementia.

A critical literature review of the effectiveness of various instruments in the diagnosis of dementia in adults with intellectual disabilities

Introduction

Currently, there is no consensus on dementia diagnostics in adults with intellectual disabilities (ID). There are three types of assessments available: direct cognitive tests, test batteries, and informant reports.

Methods

A systematic literature search was conducted in four databases yielding 9840 records. Relevant studies were identified and selected using predefined inclusion and exclusion criteria and then coded and classified according to assessment type. This was completed by two independent researchers, with a third consulted when discrepancies arose. The review collates diagnostic instruments and presents strengths and weaknesses.

Results

Overall 47 studies met the search criteria, and 43 instruments were extracted from the selected studies. Of which, 10 instruments were classified as test batteries, 23 were classified as direct cognitive tests, and the remaining 10 were informant reports.

Discussion

This review can recommend that cognitive test batteries can offer the most practical and efficient method for dementia diagnosis in individuals with ID.

"Intellectual developmental disorders": reflections on the international consensus document for redefining "mental retardation-intellectual disability" in ICD-11

PURPOSE

The debate as to whether intellectual disability (ID) should be conceptualized as a health condition or as a disability has intensified as the revision of World Health Organization's (WHO's) International Classification of Diseases (ICD) is being finalized. Defining ID as a health condition is central to retaining it in ICD, with significant implications for health policy and access to health services. The purpose of this paper is to include some reflections on the consensus document produced by the first WHO Working Group on the Classification of MR (WHO WG-MR) and on the process that was followed to realize it. The consensus report was the basis for the development of official recommendations sent to the WHO Advisory Group for ICD-11.

DESIGN/METHODOLOGY/APPROACH

A mixed qualitative approach was followed in a series of meetings leading to the final consensus report submitted to the WHO Advisory group. These recommendations combined prior expert knowledge with available evidence; a nominal approach was followed throughout with face-to-face conferences.

FINDINGS

The WG recommended a synonym set ("synset") ontological approach to the conceptualisation of this health condition underlying a clinical rationale for its diagnosis. It proposed replacing MR with Intellectual Developmental Disorders (IDD) in ICD-11, defined as "a group of developmental conditions characterized by a significant impairment of cognitive functions, which are associated with limitations of learning, adaptive behaviour and skills". The WG further advised that IDD be included under the parent category of neurodevelopmental disorders, that current distinctions (mild, moderate, severe and profound) be continued as severity qualifiers, and that problem behaviours removed from its core classification structure and instead described as associated features.

ORIGINALITY/VALUE

Within the ID/IDD synset two different names combine distinct aspects under a single construct that describes its clinical as well as social, educational and policy utilities. The single construct incorporates IDD as a clinical meta-syndrome, and ID as its functioning and disability counterpart. IDD and ID are not synonymous or mirror concepts as they have different scientific, social and policy applications. New diagnostic criteria for IDD should be based on a developmental approach, which accounts for the complex causal factors known to impact the acquisition of specific cognitive abilities and adaptive behaviours. The paper focuses on a new clinical framework for the diagnosis of IDD that also includes and complements the existing social, educational and policy components inherent in ID.

Central nervous system medication use in older adults with intellectual disability: Results from the successful ageing in intellectual disability study

OBJECTIVE

Information on the rates and predictors of polypharmacy of central nervous system medication in older people with intellectual disability is limited, despite the increased life expectancy of this group. This study examined central nervous system medication use in an older sample of people with intellectual disability.

METHODS

Data regarding demographics, psychiatric diagnoses and current medications were collected as part of a larger survey completed by carers of people with intellectual disability over the age of 40 years. Recruitment occurred predominantly via disability services across different urban and rural locations in New South Wales and Victoria. Medications were coded according to the Monthly Index of Medical Specialties central nervous system medication categories, including sedatives/hypnotics, anti-anxiety agents, antipsychotics, antidepressants, central nervous system stimulants, movement disorder medications and anticonvulsants. The Developmental Behaviour Checklist for Adults was used to assess behaviour.

RESULTS

Data were available for 114 people with intellectual disability. In all, 62.3% of the sample was prescribed a central nervous system medication, with 47.4% taking more than one. Of those who were medicated, 46.5% had a neurological diagnosis (a seizure disorder or Parkinson's disease) and 45.1% had a psychiatric diagnosis (an affective or psychotic disorder). Linear regression revealed that polypharmacy was predicted by the presence of neurological and psychiatric diagnosis, higher Developmental Behaviour Checklist for Adults scores and male gender.

CONCLUSION

This study is the first to focus on central nervous system medication in an older sample with intellectual disability. The findings are in line with the wider literature in younger people, showing a high degree of prescription and polypharmacy. Within the sample, there seems to be adequate rationale for central nervous system medication prescription. Although these data do not indicate non-adherence to guidelines for prescribing in intellectual disability, the high rate of polypharmacy and its relationship to Developmental Behaviour Checklist for Adults scores reiterate the importance of continued medication review in older people with intellectual disability.

Prevalence of Behavioural and Psychological Symptoms of Dementia in Individuals with Learning Disabilities

A review of 23 studies investigating the prevalence of Behavioural and psychological symptoms of dementia (BPSD) in the general and learning disability population and measures used to assess BPSD was carried out. BPSD are non-cognitive symptoms, which constitute as a major component of dementia regardless of its subtype Research has indicated that there is a high prevalence of BPSD in the general dementia population. There are limited studies, which investigate the prevalence of BPSD within individuals who have learning disabilities and dementia. Findings suggest BPSDs are present within individuals with learning disabilities and dementia. Future research should use updated tools for investigating the prevalence of BPSD within individuals with learning disabilities and dementia.

Validation of the Chinese version of the dementia screening questionnaire for individuals with intellectual disabilities (DSQIID-CV)

BACKGROUND

An increasing number of people with intellectual disabilities (ID) are at risk of developing age-related disorders such as dementia because of a dramatic increase in life expectancy in this population in the recent years. There is no validated dementia screening instrument for Chinese people with ID. The Dementia Screening Questionnaire for Individuals with Intellectual Disabilities (DSQIID) was reported to be a valid, user-friendly, easy-to-use observer-rated instrument. It was developed in the UK and has good psychometric properties. Validation of a Chinese version of the DSQIID will facilitate its application among the Chinese population.

METHOD

The DSQIID was translated into the Chinese version (DSQIID-CV). By purposive sampling, service users with ID aged 40 years or over were recruited through two large centres serving adults with ID in Hong Kong. Carers who had taken care of the participants continuously for the past 6 months were invited to complete the DSQIID-CV. All participants were examined by qualified psychiatrists to determine the presence or absence of dementia.

RESULTS

Two hundred people with ID whose age ranged between 40 and 73 years (mean 51 years, SD=7.34 years) were recruited to the study. A clinical diagnosis of dementia was established in 13 participants. An overall total score of 22 as a screening cut-off provided the optimum levels of specificity (0.995) and sensitivity (0.923). The DSQIID-CV showed good internal consistency (alpha=0.945) for all its 53 items, and excellent test-retest reliability (0.978, n=46) and inter-rater reliability (1.000, n=47). Exploratory factor analysis resulted in a four-factor solution explaining 45% of the total variance.

CONCLUSIONS

The DSQIID-CV is shown to have robust psychometric properties. It is the first valid and reliable dementia screening instrument for Chinese adults with ID.

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.

Neurodevelopmental origin of cognitive impairment in schizophrenia

Cognitive impairment is a common feature of schizophrenia; however, its origin remains controversial. Neurodevelopmental abnormalities clearly play a role in pre-morbid cognitive dysfunction in schizophrenia, yet many authors believe that schizophrenia is characterized by illness-related cognitive decline before and after onset of the psychosis that can be the result of neurodegenerative changes. The main reasons behinds such arguments include, first, the evidence showing that effect sizes of the cognitive deficits in subjects who develop adult schizophrenia gradually increase in the first two decades of life and, second, the fact that there is functional decline in many patients with schizophrenia over the years. In this Editorial, I argue that current evidence suggests that illness-related cognitive impairment is neurodevelopmental in origin and characterized by slower gain (developmental lag) but not cognitive decline continuing throughout the first two decades of life. I introduce a model suggesting that neurodevelopmental abnormality can in fact explain the course of cognitive dysfunction and variations in the trajectory of functional decline throughout the life in individuals with schizophrenia. In this model, the severity of underlying neurodevelopmental abnormality determines the age that cognitive deficits first become apparent and contributes to the cognitive reserve of the individual. Interaction of neurodevelopmental abnormality with clinical symptoms, especially negative symptoms and aging, vascular changes, psychological and iatrogenic factors contributes to the heterogeneity of the functional trajectory observed in this disorder.

Behaviour disorders in adults with learning disabilities: Effect of age and differentiation from other psychiatric disorders

Objective: To clarify the effect of age on behaviour disorders in adults with learning disabilities, and the differentiation of behaviour disorders from other psychiatric disorders.

Method: Detailed assessments, measuring maladaptive behaviours, psychiatric disorders and demographic factors were completed on 93.7% of all people with learning disabilities aged 65 years and over, living in Leicestershire, UK (n = 134), and also a random sample of adults with learning disabilities aged 20-64 years (n = 73). Behaviour disorders were distinguished from other psychiatric disorders. Descriptive and inferential statistics were calculated.

Result: Equal rates (15%) and types of behaviour disorder were found in the two groups. The presence of behaviour disorder was associated with the severity of learning disabilities, but age was not associated, and nor was presence of epilepsy or gender. In many cases, positive scores on the behavioural assessment, which carers attributed to challenging behaviour/ behaviour disorder, were actually symptoms of psychiatric illness.

Conclusion: Behaviour disorders persist into old age, and therefore require management from the appropriate services. This need will increase, due to increasing lifespan. The accurate interpretation of behaviour scales requires that a comprehensive psychiatric assessment is also undertaken, particularly in elderly people where rates of psychiatric disorders are higher than for younger adults.

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.

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.

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.

The impact of living arrangements and deinstitutionalisation in the health status of persons with intellectual disability in Europe

BACKGROUND

Despite progress in the process of deinstitutionalisation, very little is known about the health conditions of people with intellectual disability (PWID) who live in large institutions and PWID living in small residential services, family homes or independent living within the community. Furthermore, there are no international comparison studies at European level of the health status and health risk factors of PWID living in fully staffed residential services with formal support and care compared with those living in unstaffed family homes or independent houses with no formal support.

METHODS

A total of 1269 persons with ID and/or their proxy respondents were recruited and face-to-face interviewed in 14 EU countries with the P15, a multinational assessment battery for collecting data on health indicators relevant to PWID. Participants were grouped according to their living arrangements, availability of formal support and stage of deinstitutionalisation.

RESULTS

Obesity and sedentary lifestyle along with a number of illnesses such as epilepsy, mental disorders, allergies or constipation were highly prevalent among PWID. A significantly higher presence of myocardial infarctions, chronic bronchitis, osteoporosis and gastric or duodenal ulcers was found among participants in countries considered to be at the early stage of deinstitutionalisation. Regardless of deinstitutionalisation stage, important deficits in variables related to such medical health promotion measures as vaccinations, cancer screenings and medical checks were found in family homes and independent living arrangements. Age, number of people living in the same home or number of places in residential services, presence of affective symptoms and obesity require further attention as they seem to be related to an increase in the number of illnesses suffered by PWID.

DISCUSSION

Particular illnesses were found to be highly prevalent in PWID. There were important differences between different living arrangements depending on the level of formal support available and the stage of deinstitutionalisation. PWID are in need of tailored primary health programs that guarantee their access to quality health and health promotion and the preventative health actions of vaccination programs, systematic health checks, specific screenings and nutritional controls. Extensive national health surveys and epidemiological studies of PWID in the EC member states are urgently needed in order to reduce increased morbidity rates among this population.

Health checks in primary care for adults with intellectual disabilities: how extensive should they be?

BACKGROUND

Routine health checks have gained prominence as a way of detecting unmet need in primary care for adults with intellectual disabilities (ID) and general practitioners are being incentivised in the UK to carry out health checks for many conditions through an incentivisation scheme known as the Quality and Outcomes Framework (QOF). However, little is known about the data being routinely recorded in such health checks in relation to people with ID as practices are currently only incentivised to keep a register of people with ID. The aim of this study was to explore the additional value of a health check for people with ID compared with standard care provided through the current QOF structure.

METHODS

Representative practices were recruited using a stratified sampling approach in four primary care trusts to carry out health checks over a 6-month period. The extracted data were divided into two aggregated informational domains for the purpose of multilevel regression analysis: 'ID-specific' (containing data on visual assessment, hearing assessment, behaviour assessment, bladder function, bowel function and feeding assessment) and financially incentivised QOF targets (blood pressure, smoking status, ethnicity, body mass index, urine analysis and carer details) which are incentivised processes.

RESULTS

A total of 651 patients with ID were identified in 27 practices. Only nine practices undertook a health check on 92 of their patients with ID. Significant differences were found in the recorded information, between those who underwent a health check and those who did not (P < 0.001, chi(2) = 56.3). In the group that had health check, recorded information was on average higher for the 'QOF targets' domain, compared with the 'ID-specific' domain, by 58.7% (95% CI: 54.1, 63.3, P < 0.001).

CONCLUSIONS

If incentives are to be used as a method for improving care for people with ID through health checks a more targeted approach focused on ID-specific health issues might be more appropriate than an extensive health check.

Epidemiology of mental ill health in adults with intellectual disabilities

PURPOSE OF REVIEW

Adults with intellectual disabilities experience higher rates of mental ill health than the general population. Despite this, the epidemiological knowledge base remains limited. The purpose of this article is to review mental health epidemiological studies relevant to adults with intellectual disabilities, published since January 2008.

RECENT FINDINGS

Several studies have aimed to build the epidemiological evidence base, particularly with regards to problem behaviours, which appear to be remitting-relapsing conditions rather than necessarily being chronic. Most of such work confirms prevalence and incidence rates, and conducts exploratory analyses to determine factors independently related to mental ill health. Down syndrome protects against problem behaviours and mental ill health (except dementia that occurs at a higher rate), whereas epilepsy does not appear to affect risk for mental ill health. Dementia is four times more common in older persons with intellectual disabilities without Down syndrome than in the general population. Persons with borderline intellectual disabilities also experience higher rates of mental ill health than the general population, but receive fewer treatments.

SUMMARY

This work builds usefully upon previous studies. Further hypothesis-based analyses are needed.

The relationship of dementia prevalence in older adults with intellectual disability (ID) to age and severity of ID

BACKGROUND

Previous research has shown that adults with intellectual disability (ID) may be more at risk of developing dementia in old age than expected. However, the effect of age and ID severity on dementia prevalence rates has never been reported. We investigated the predictions that older adults with ID should have high prevalence rates of dementia that differ between ID severity groups and that the age-associated risk should be shifted to a younger age relative to the general population.

METHOD

A two-staged epidemiological survey of 281 adults with ID without Down syndrome (DS) aged 60 years; participants who screened positive with a memory task, informant-reported change in function or with the Dementia Questionnaire for Persons with Mental Retardation (DMR) underwent a detailed assessment. Diagnoses were made by psychiatrists according to international criteria. Prevalence rates were compared with UK prevalence and European consensus rates using standardized morbidity ratios (SMRs).

RESULTS

Dementia was more common in this population (prevalence of 18.3%, SMR 2.77 in those aged 65 years). Prevalence rates did not differ between mild, moderate and severe ID groups. Age was a strong risk factor and was not influenced by sex or ID severity. As predicted, SMRs were higher for younger age groups compared to older age groups, indicating a relative shift in age-associated risk.

CONCLUSIONS

Criteria-defined dementia is 2-3 times more common in the ID population, with a shift in risk to younger age groups compared to the general population.

Prevalence of dementia in intellectual disability using different diagnostic criteria

BACKGROUND

Diagnosis of dementia is complex in adults with intellectual disability owing to their pre-existing deficits and different presentation.

AIMS

To describe the clinical features and prevalence of dementia and its subtypes, and to compare the concurrent validity of dementia criteria in older adults with intellectual disability.

METHOD

The Becoming Older with Learning Disability (BOLD) memory study is a two-stage epidemiological survey of adults with intellectual disability without Down syndrome aged 60 years and older, with comprehensive assessment of people who screen positive. Dementia was diagnosed according to ICD-10, DSM-IV and DC-LD criteria.

RESULTS

The DSM-IV dementia criteria were more inclusive. Diagnosis using ICD-10 excluded people with even moderate dementia. Clinical subtypes of dementia can be recognised in adults with intellectual disability. Alzheimer's dementia was the most common, with a prevalence of 8.6% (95% CI 5.2-13.0), almost three times greater than expected.

CONCLUSIONS

Dementia is common in older adults with intellectual disability, but prevalence differs according to the diagnostic criteria used. This has implications for clinical practice.

The use of Dementia Care Mapping in people with a learning disability and dementia

Dementia Care Mapping is a method for evaluating quality of life in and quality of care of people with dementia and has been used widely in services for older adults. This article presents a report of Dementia Care Mapping for eight adults with learning disabilities and dementia. Trained 'mappers' observed individuals over a set period and recorded their behaviour every 5 minutes. The person was then assigned a wellbeing or illbeing value for each 5 minute period, based on the mapper's empathic judgement as to how the individual was feeling at that time. Any examples of particularly positive or negative events were also recorded and the results fed back to the staff team. Data were used to aid care planning, and outcomes are reported.

Special Care Dentistry: a professional challenge

As a profession we have a responsibility to ensure that the oral health needs of individuals and groups who have a physical, sensory, intellectual, medical, emotional or social impairment or disability are met. In the UK, over 200,000 adults have profound learning disabilities and/or complex medical conditions. Adults with a disability often have poorer oral health, poorer health outcomes and poorer access to services than the rest of the population. This paper examines the need for Special Care Dentistry based on a review of published literature, surveys and health policy, and suggests how services might be delivered in the future. Existing models of good practice reveal that established clinicians working in this field have a patient base of between 850 and 1,500 patients per year and work across primary care and hospital settings, liaising with colleagues in health, social services and the voluntary sector to ensure integrated health care planning. On this basis, a conservative estimate of 133 specialists is suggested for the future, working in networks with Dentists with Special Interests (DwSIs) and primary dental care practitioners. A skilled workforce that can address the wider needs of people requiring Special Care Dentistry should be formally recognised and developed within the UK to ensure that the needs of the most vulnerable sections of the community are addressed in future.

A measure of subjective burden for dementia care: the Caregiving Difficulty Scale--Intellectual Disability

BACKGROUND

It has been suggested in the literature on family caregiving for persons with Alzheimer's dementia (AD) that levels of objective and subjective burden among carers often predict institutionalization of the persons with AD. There is a paucity of measures to assess whether perceived burden among formal caregivers may also predict movement to more restrictive settings for persons with intellectual disabilities (ID) and AD. This study focused upon the development of a measure of subjective burden, The Caregiving Difficulty Scale - Intellectual Disability (CDS-ID) as a first step in addressing this measurement deficit.

METHODS

An existing caregiver subjective burden scale, the Caregiving Hassles Scale (CHS) was adapted for use with 203 staff caregivers of persons with ID and AD. Preliminary testing of existing CHS items and proposed new items was carried out in two countries, Ireland and the USA. Confirmatory factor analysis with the existing items and exploratory factor analysis with existing and proposed new items for the scale was used to establish the content and test the psychometric properties of a revised scale, the CDS-ID.

RESULTS

On the existing CHS items, staff carers appeared to experience greater subjective burden than has been reported for family caregivers. However, the psychometric properties of the CHS found with this population were poor. Factor analysis produced a revised scale, the CDS-ID with three subscales with Cronbach alphas ranging from 0.75 to 0.93 and 38 items overall.

CONCLUSIONS

This new scale when used with objective burden and other scales offers an opportunity to more systematically measure the difficulties staff experience when caring for persons with ID who present with symptoms of AD.

Self-reported smoking and alcohol use among adolescents with intellectual disabilities

Self-reported smoking and alcohol use were examined among 95 adolescents (aged 11-15) with intellectual disabilities and 4069 adolescents who did not have intellectual disabilities. Results indicated that adolescents with intellectual disabilities reported increased rates of smoking and decreased rates of using alcohol at least once a month. There were no marked differences between the two groups on smoking seven or more cigarettes a day, having ever smoked at all and having ever used alcohol. Elevated levels of smoking appeared to be an artefact of increased rates of poverty among adolescents with intellectual disabilities. Distinct patterns of risk were associated with smoking and alcohol use among adolescents with intellectual disabilities. Smoking was closely associated with the experience of poverty and adolescent mental health. Alcohol use was associated with less punitive child management practices and carer mental health. Results are discussed in the context of health promotion.

Pharmacological management of challenging behavior of individuals with intellectual disability

In many Westernized countries, including Australia, concerns about the use of psychotropic drugs to manage the challenging behavior of individuals with intellectual disability have resulted in the development of legislative and procedural controls. Although these constraints may limit indiscriminate use, employing medication remains a common practice. This study examined information about 873 individuals (566 males, 307 females) who were the subjects of reports to the Intellectual Disability Review Panel in March 2000 concerning the use of chemical restraint. A high proportion of people with intellectual disability were reported to have received drugs for purposes of behavioral restraint. The range of drugs was extensive, although those from the antipsychotic class were the most frequently reported. Many individuals concurrently received more than one type of drug or more than one drug from the same drug class. More males than females and more older than younger individuals were administered medication. A relationship between gender and age was apparent, with younger males but older females dominating. The use of drugs to mange the behavior of people with intellectual disability may at times be warranted. However, it is important that the extent and type of drug use, as well as the characteristics of those who are medicated, be subject to ongoing scrutiny.

Organisational simplification and secondary complexity in health services for adults with learning disabilities

This paper explores the role of complexity and simplification in the delivery of health care for adults with learning disabilities, drawing upon qualitative data obtained in a study carried out in NE England. It is argued that the requirement to manage complex health needs with limited resources causes service providers to simplify, standardise and routinise care. Simplified service models may work well enough for the majority of clients, but can impede recognition of the needs of those whose characteristics are not congruent with an adopted model. The data were analysed in relation to the core category, identified through thematic analysis, of secondary complexity arising from organisational simplification. Organisational simplification generates secondary complexity when operational routines designed to make health complexity manageable cannot accommodate the needs of non-standard service users. Associated themes, namely the social context of services, power and control, communication skills, expertise and service inclusiveness and evaluation are explored in relation to the core category. The concept of secondary complexity resulting from organisational simplification may partly explain seemingly irrational health service provider behaviour.

A memory clinic for older people with intellectual disabilities

Cognitive decline in older people with intellectual disabilities (ID) is often under-recognized. Following the publication of the National Service Framework for Older People and the white paper Valuing People, older people with intellectual disabilities of all aetiologies should have access to a systematic assessment of their cognitive function in order to detect decline in cognition and adaptive skills and implement appropriate treatments as early as possible. The development of a memory clinic for older people with ID is described, including instruments used and characteristics of attendees. Such projects are in line with current UK government policies and can contribute to the improvement of standards of care and support research in this vulnerable group of people.

Traumatic brain injury as a risk factor for Alzheimer's disease: a review

Accumulating epidemiological evidence implicates traumatic brain injury as a pathogenic agent in the development of Alzheimer's disease (AD). Considering the increase in the prevalence of both traumatic brain injury and AD in recent times, the possibility that brain trauma may provoke the early development of AD has important implications for health service planning, preventative efforts, and medico-legal compensation settlements. This paper evaluates the plausibility of the proposed link between traumatic brain injury and AD, largely by way of exploring a theoretical perspective advanced by Satz (1993) and considering recent contributions from the epidemiological, neuropathological, and biochemical literature that are pertinent to this issue. The literature reviewed provides sufficient support and empirical vindication to give credence to the proposed association between these two neuropsychological entities at the statistical, theoretical, and biological level.

A population-based health survey of maladaptive behaviours associated with dementia in elderly people with learning disabilities

Maladaptive behaviours are known to present as a feature of dementia amongst people from the general population, but there has been little research to examine whether this has implications for people with learning disabilities who develop dementia. Out of 143 people with learning disabilities aged 65 years and over living in Leicestershire, England, 134 (93.7%) participated in the study. Twenty-nine people diagnosed as having dementia were compared against 99 people without dementia; six people with possible dementia were excluded from the analysis. Comparisons were made on the results of a checklist of maladaptive behaviours. Seventeen out of the 22 maladaptive behaviours examined were found to be more prevalent amongst the people with dementia. The behaviours which were significantly more prevalent in the group with dementia included lack of energy, lack of sense of danger, sleep disturbance, agitation, incontinence, excessively uncooperative, mealtime/feeding problem, irritability and aggression. Dementia is becoming more prevalent amongst people with learning disabilities because of their increasing life span. Maladaptive behaviours are commonly associated with dementia. This can cause a significant burden for individuals and their carers, which may influence the viability of a person's residential placement.

Deficient health and social services for elderly people with learning disabilities

Elderly people with learning disabilities have greater psychiatric morbidity than younger individuals, but a previous report has suggested that the majority of the former do not receive treatment. All people with learning disabilities aged 65 years and over living in Leicestershire, England (n = 134), and a random sample of adults with learning disabilities aged between 20 and 64 years (n = 73) were assessed for psychiatric disorders and service use. Elderly people received less day care, less respite care and were less likely to have a social worker and receive input from most health services than the younger group. Chiropody was an exception. Those receiving psychiatric services did so through the learning disabilities specialist services only. Those with an additional psychiatric disorder were more likely to receive services, but results still favoured the younger group. Services were better accessed by those living in residential care. Failure to access services may relate to carers attitudes and beliefs: in learning disability settings, morbidity was attributed to 'it's just old age; in the elderly settings, morbidity was attributed to 'it's because s/he has learning disabilities'. The specialist health and social services need to take the lead in health promotion and education.