M.G.M. Olde Rikkert

Outcome instruments to measure frailty: A systematic review

Frailty is one of the greatest challenges for healthcare professionals. The level of frailty depends on several interrelated factors and can change over time while different interventions seem to be able to influence the level of frailty. Therefore, an outcome instrument to measure frailty with sound clinimetric properties is needed. A systematic review on evaluative measures of frailty was performed in the databases PubMed, EMBASE, Cinahl and Cochrane. The results show numerous instruments that measure the level of frailty. This article gives a clear overview of the content of these frailty instruments and describes their clinimetric properties. Frailty instruments, however, are often developed as prognostic instruments and have also been validated as such. The clinimetric properties of these instruments as evaluative outcome measures are unclear.

Effects of physical exercise therapy on mobility, physical functioning, physical activity and quality of life in community-dwelling older adults with impaired mobility, physical disability and/or multi-morbidity: a meta-analysis

This is the first meta-analysis focusing on elderly patients with mobility problems, physical disability and/or multi-morbidity. The aim of this study is to assess the effect of physical exercise therapy on mobility, physical functioning, physical activity and quality of life. A broad systematic literature search was performed in the databases PubMed, CINAHL, Embase, PEDro and The Cochrane Library. Relevant study characteristics were reviewed and meta-analyses using standardized mean differences (SMDs) were performed. The results show that physical exercise therapy has a positive effect on mobility (SMD final value: 0.18; 95% CI: 0.05, 0.30; SMD change value: 0.82; 95% CI: 0.54, 1.10) and physical functioning (SMD final value: 0.27; 95% CI: 0.08, 0.46; SMD change value: 2.93; 95% CI: 2.50, 3.36). High-intensity exercise interventions seem to be somewhat more effective in improving physical functioning than low-intensity exercise interventions (SMD final value: 0.22; 95% CI: -0.17, 0.62; SMD change value: 0.38; 95% CI: -0.48, 1.25). These positive effects are of great value for older adults who are already physically impaired. The effect on physical activity and quality of life was not evident and no definite conclusions on the most effective type of physical exercise therapy intervention can be drawn.

Age and diagnostic performance of Alzheimer disease CSF biomarkers

Objectives: Core CSF changes in Alzheimer disease (AD) are decreased amyloid β1–42, increased total tau, and increased phospho-tau, probably indicating amyloid plaque accumulation, axonal degeneration, and tangle pathology, respectively. These biomarkers identify AD already at the predementia stage, but their diagnostic performance might be affected by age-dependent increase of AD-type brain pathology in cognitively unaffected elderly. Methods: We investigated effects of age on the diagnostic performance of CSF biomarkers in a uniquely large multicenter study population, including a cross-sectional cohort of 529 patients with AD dementia (median age 71, range 43–89 years) and 304 controls (67, 44–91 years), and a longitudinal cohort of 750 subjects without dementia with mild cognitive impairment (69, 43–89 years) followed for at least 2 years, or until dementia diagnosis. Results: The specificities for subjects without AD and the areas under the receiver operating characteristics curves decreased with age. However, the positive predictive value for a combination of biomarkers remained stable, while the negative predictive value decreased only slightly in old subjects, as an effect of the high AD prevalence in older ages. Conclusion: Although the diagnostic accuracies for AD decreased with age, the predictive values for a combination of biomarkers remained essentially stable. The findings highlight biomarker variability across ages, but support the use of CSF biomarkers for AD even in older populations.

Systematic review of quantitative clinical gait analysis in patients with dementia.

Summary.Introduction:Diminished mobility often accompanies dementia and has a great impact on independence and quality of life. New treatment strategies for dementia are emerging, but the effects on gait remains to be studied objectively. In this review we address the general effects of dementia on gait as revealed by quantitative gait analysis.Methods:A systematic literature search with the (MESH) terms: ‘dementia’ and ‘gait disorders’ in Medline, CC, Psyclit and CinaHL between 1980–2002. Main inclusion criteria: controlled studies; patients with dementia; quantitative gait data.Results:Seven publications met the inclusion criteria. All compared gait in Alzheimer’s Disease (AD) with healthy elderly controls; one also assessed gait in Vascular Dementia (VaD). The methodology used was inconsistent and often had many shortcomings. However, there were several consistent findings: walking velocity decreased in dementia compared to healthy controls and decreased further with progressing severity of dementia. VaD was associated with a significant decrease in walking velocity compared to AD subjects. Dementia was associated with a shortened step length, an increased double support time and step to step variability.Discussion:Gait in dementia is hardly analyzed in a well-designed manner. Despite this, the literature suggests that quantitative gait analysis can be sufficiently reliable and responsive to measure decline in walking velocity between subjects with and without dementia. More research is required to assess, both on an individual and a group level, how the minimal clinically relevant changes in gait in elderly demented patients should be defined and what would be the most responsive method to measure these changes.Zusammenfassung.Verminderte Gehfähigkeit ist oft mit Demenz vergesellschaftet und hat eine große Auswirkung auf die Selbstständigkeit und die Lebensqualität. Neue Behandlungsstrategien für die Demenz werden entwickelt, aber die Auswirkungen auf das Gehvermögen muss mit objektiven Messmethoden untersucht werden. In diesem Review werden die allgemeinen Auswirkungen der Demenz auf den Gang untersucht sofern sie durch quantitative Ganganalysen dokumentiert wurden.Methoden:Eine systematische Literatursuche zwischen 1980 und 2002 wurde in Medline, CC, Psyclit und Cina HL mit folgenden (MESH) Terms durchgeführt: Demenz und Gangstörungen (‚dementia‘ und ‚gait disorders‘). Die Einschlusskriterien waren: kontrollierte Studien, Patienten mit Demenz, quantitative Gangdaten.Ergebnisse:Sieben Veröffentlichungen erfüllten die Einschlusskriterien. Alle verglichen den Gang in Patienten mit Alzheimerscher Erkrankung und gesunden, älteren Kontrollprobanden. Eine weitere Studie überprüfte darüber hinaus das Gehverhalten bei vaskulärer Demenz. Die Methodik die benutzt wurde, war inkonsistent und hatte teilweise erhebliche Schwächen. Es gab jedoch verschiedene übereinstimmende Ergebnisse: so verlangsamte sich die Gehgeschwindigkeit bei demenzkranken Patienten verglichen mit gesunden Älteren. Sie verlangsamte sich weiterhin mit Fortschreiten der Schwere der Demenzerkrankung. Die vaskuläre Demenz war verbunden mit einem signifikanten Abfall der Gehgeschwindigkeit, im Vergleich mit Patienten einer Alzheimerschen Erkrankung. Die Demenz war verbunden mit einer verkürzten Schrittlänge, einer längeren Dauer beider Füße auf dem Boden und einer größeren Schrittvariabilität.Diskussion:Der Gang bei demenzkranken Menschen ist kaum in methodisch guter Form untersucht. Trotz dieser Tatsache lassen die vorliegenden Studien den Schluss zu, dass eine quantitative Ganganalyse ausreichend reliabel sein kann und geeignet ist, den Abfall in der Gehgeschwindigkeit zwischen Personen mit und ohne Demenz zu messen. Es sind jedoch mehr wissenschaftliche Untersuchungen notwendig, um sowohl auf der individuellen als auch auf der Gruppenebene abzuschätzen, wie minimale aber klinisch relevante Veränderungen im Gang bei älteren Demenzkranke definiert werden können und welche Methode am Besten geeignet ist diese Veränderungen abzubilden.

Weight loss in neurodegenerative disorders.

Unintended weight loss frequently complicates the course of many neurodegenerative disorders and can contribute substantially to both morbidity and mortality. This will be illustrated here by reviewing the characteristics of unintended weight loss in the three major neurodegenerative disorders: Alzheimer’s disease, Parkinson’s disease and Huntington’s disease. A common denominator of weight loss in these neurodegenerative disorders is its typically complex pathophysiology. Timely recognition of the underlying pathophysiological process is of crucial importance, since a tailored treatment of weight loss can considerably improve the quality of life. This treatment is, primarily, comprised of a number of methods of increasing energy intake. Moreover, there are indications for defects in the systemic energy homeostasis and gastrointestinal function, which may also serve as therapeutic targets. However, the clinical merits of such interventions have yet to be demonstrated.

Development of Screening Guidelines and Clinical Criteria for Predementia Alzheimer’s Disease

Background: There is an urgent need to identify subjects with Alzheimer’s disease (AD) in the predementia phase, but validated diagnostic approaches are currently lacking. In this paper, we present the background, design and methods of a study, which aims to develop clinical criteria for predementia AD. We also present baseline characteristics of the subjects included. The study was part of the multicentre DESCRIPA project, which is being conducted within the network of the European Alzheimer’s Disease Consortium. Methods: Clinical criteria will be based on a prospective cohort study of non-demented subjects older than 55 years and referred to a memory clinic. At baseline, a number of markers and risk factors for AD were collected, including demographic variables, measures of performance in activities of daily living, cognitive, neuroimaging and genetic markers, and serum and cerebrospinal fluid markers. Subjects will be reassessed annually for 2–3 years, and we will evaluate which combination of variables best predicts AD-type dementia at follow-up. Results: Between 2003 and 2005, 881 subjects were included from 20 memory clinics. Subjects were on average 70.3 years old, and had 10.4 years of education. The average score on the Mini-Mental State Examination was 27.4.

Frail elderly patients with dementia go too fast

The reason why patients with dementia fall more often and sustain more fractures than patients without dementia remains unclear. Therefore, the relationship between dementia and gait velocity as a marker for mobility and falls in a cohort of frail elderly (mean age of 77.3 years) inpatients was assessed. Patients with dementia were expected to walk slower than patients without dementia. A trend was indeed observed: absolute gait velocity of 0.59 m/s in patients with dementia (n = 63) versus 0.65 m/s in patients without dementia (n = 62; p = 0.19). After adjustment for parkinsonism and walking aids, however, patients with dementia walked 0.44 m/s faster than patients without dementia (p = 0.02). Probable explanations are frontal lobe disinhibition and lack of insight, causing patients with dementia to walk relatively too fast in the context of their frailty. Therefore, the high risk of falls in dementia may be partially explained by the loss of control of gait velocity.

Characteristics of effective internet-mediated interventions to change lifestyle in people aged 50 and older: a systematic review

Worldwide, the number of people aged 60 years and older steadily grows to a predicted 2 billion in 2050. Online interventions increasingly target lifestyle risk factors to promote healthy aging. The objective of this systematic review is to evaluate whether Internet mediated lifestyle interventions can successfully change lifestyle in people aged 50 and older. A PubMed search was conducted resulting in twelve articles, based on ten studies. The studies focused on physical activity, weight loss, nutrition, and diabetes. Nine studies used feasible interventions, with an average small to moderate effect size. The most important result is that there are multiple studies reporting positive lifestyle changes in an older population. On average, complex interventions, whether they present tailored or generic information, and online or offline comparison, are more effective than interventions with only one component. Internet mediated interventions hold great potential in implementing effective lifestyle programs, capable of reaching large populations of older persons at very low costs.

Impact of diagnostic disclosure in dementia on patients and carers: Qualitative case series analysis

Adequate diagnostic information can be considered a basic intervention in dementia care. However, clear diagnostic disclosure in dementia is not yet regular practice and the evidence regarding patients’ preferences for or against disclosure is scarce. The aim of this study was to give an in-depth description of the impact of receiving the diagnosis of dementia, both on patients and the patients’ proxies. The method used was the design of a grounded theory interview study. Analysis of the interviews revealed that disclosure had an impact on three key domains: awareness of dementia, partnership, and social relationships. Most patients and carers reported that they had experienced the disclosure of the diagnosis as a confirmation of their assumptions. A minority of patients and carers felt threatened and shocked by the diagnosis, because they did not expect it. The findings of this analysis challenge current opinions and practice about diagnostic disclosure like obstacles anticipated by clinicians such as inducing negative feelings and causing harm. Disclosure of the diagnosis of dementia can generally be carried out without introducing stress for the patient or carer and facilitates guidance. Therefore regular practice should include the careful planning and performance of diagnostic disclosure.

Integrating unmet needs into dementia health-related quality of life research and care: Introduction of the Hierarchy Model of Needs in Dementia

Objectives: To make an inventory of needs assessment instruments in dementia, to explore the interaction between unmet needs and health-related quality of life (HRQoL) and to relate these to the conceptual model of Maslows Hierarchy of needs in order to design a dementia-specific model. Methods: Narrative review of literature on (measures of) needs of patients and caregivers and HRQoL determinants important in dementia. Relating these needs to individual goal setting instruments and Maslows Hierarchy of needs model. Results: The Camberwell Assessment of Needs for the Elderly (CANE) turns out to be a valid tool to assess needs of dementia patients, suitable for research and clinical use. The Carers’ Needs Assessment for Dementia (CNA-D) is a valid instrument to assess needs of caregivers. Patients identified significantly fewer needs than (in)formal caregivers. The most important needs, that also determine large part of HRQoL, are need for information; support with regard to symptoms of dementia; social contact and company; and for health monitoring and safety. Goal attainment scaling in dementia is an important but not yet valid outcome measure, with only few data on feasibility in dementia patients. Conclusion: There are several instruments to assess needs of dementia patients and caregivers. Domains of unmet needs and HRQoL overlap. The Hierarchy Model of Needs in Dementia (HMND) offers a new theoretical framework to address the interplay between meeting of needs and improvement of HRQoL in dementia. By identifying unmet needs in dementia-research and focussing on unmet needs in dementia-care, much can be done to improve HRQoL.