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Rolandi E, Rossi M, Colombo M, Pettinato L, Del Signore F, Aglieri V, Bottini G, Guaita A. Lifestyle, Cognitive, and Psychological Factors Associated With a Resilience Phenotype in Aging: A Multidimensional Approach on a Population-Based Sample of Oldest-Old (80+). J Gerontol B Psychol Sci Soc Sci 2024; 79:gbae132. [PMID: 39096236 PMCID: PMC11402365 DOI: 10.1093/geronb/gbae132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Indexed: 08/05/2024] Open
Abstract
OBJECTIVES To investigate the determinants of resilience phenotype in aging, operationalized as the maintenance of cognitive, physical, and psychological health in very old individuals (80+), we investigated the structure and interrelated impact of the main resilience-enhancing factors, which are usually studied in separate research fields. METHODS Participants were older adults without dementia recruited for the fifth wave of the InveCe.Ab population-based cohort study (aged 83-87 years). Multidimensional evaluation comprised blood sampling, social and lifestyle survey, and geriatric and neuropsychological assessment. We classified resilient individuals as displaying normal cognition, functional independence, and mental health. First, we performed exploratory factor analysis (EFA) to examine the underlying structure of the relevant cognitive, lifestyle, physical, and psychological resilience-enhancing factors. The factors obtained were included as predictors of the resilience phenotype in the logistic regression model, controlling for sociodemographic and cumulative exposure to physical and psychosocial stressors, including COVID-19 infection. RESULTS Among the 404 enrolled participants, 153 (38%) exhibited the resilience phenotype. EFA resulted in the identification of six factors (59% of variance): cognitive reserve, affective reserve, insecure attachment, current lifestyle, physical reserve, and avoidant attachment. Among these factors, cognitive reserve, affective reserve, and current lifestyle significantly and independently predicted resilience status, controlling for cumulative exposure to age-related stressors and COVID-19 infection. DISCUSSION Our findings showed that, even in very old age, both early and late life modifiable factors affect individuals' ability to adapt to the aging process, thus confirming the importance of a life-course approach to improve health outcomes in the aged population. CLINICAL TRIALS REGISTRATION NUMBER NCT01345110.
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Affiliation(s)
- Elena Rolandi
- Golgi Cenci Foundation, Abbiategrasso, Milano, Italy
- Department of Brain and Behavioral Sciences, University of Pavia, Pavia, Italy
| | - Michele Rossi
- Golgi Cenci Foundation, Abbiategrasso, Milano, Italy
| | - Mauro Colombo
- Golgi Cenci Foundation, Abbiategrasso, Milano, Italy
| | | | | | - Virginia Aglieri
- Fondazione Grigioni per il Morbo di Parkinson, Milano, Italy
- Parkinson Institute Milan, ASST Gaetano Pini CTO, Milano, Italy
| | - Gabriella Bottini
- Department of Brain and Behavioral Sciences, University of Pavia, Pavia, Italy
- Cognitive Neuropsychology Center Neuroscience Department, GOM Niguarda, Milano, Italy
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Contador I, Buch-Vicente B, del Ser T, Llamas-Velasco S, Villarejo-Galende A, Benito-León J, Bermejo-Pareja F. Charting Alzheimer's Disease and Dementia: Epidemiological Insights, Risk Factors and Prevention Pathways. J Clin Med 2024; 13:4100. [PMID: 39064140 PMCID: PMC11278014 DOI: 10.3390/jcm13144100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2024] [Revised: 07/08/2024] [Accepted: 07/09/2024] [Indexed: 07/28/2024] Open
Abstract
Alzheimer's disease (AD), the most common cause of dementia, is a complex and multifactorial condition without cure at present. The latest treatments, based on anti-amyloid monoclonal antibodies, have only a modest effect in reducing the progression of cognitive decline in AD, whereas the possibility of preventing AD has become a crucial area of research. In fact, recent studies have observed a decrease in dementia incidence in developed regions such as the US and Europe. However, these trends have not been mirrored in non-Western countries (Japan or China), and the contributing factors of this reduction remain unclear. The Lancet Commission has delineated a constrained classification of 12 risk factors across different life stages. Nevertheless, the scientific literature has pointed to over 200 factors-including sociodemographic, medical, psychological, and sociocultural conditions-related to the development of dementia/AD. This narrative review aims to synthesize the risk/protective factors of dementia/AD. Essentially, we found that risk/protective factors vary between individuals and populations, complicating the creation of a unified prevention strategy. Moreover, dementia/AD explanatory mechanisms involve a diverse array of genetic and environmental factors that interact from the early stages of life. In the future, studies across different population-based cohorts are essential to validate risk/protective factors of dementia. This evidence would help develop public health policies to decrease the incidence of dementia.
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Affiliation(s)
- Israel Contador
- Department of Basic Psychology, Psychobiology, and Methodology of Behavioral Sciences, Faculty of Psychology, University of Salamanca, 37005 Salamanca, Spain
- Aging Research Center, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet and Stockholm University, 17117 Stockholm, Sweden
| | - Bárbara Buch-Vicente
- Department of Basic Psychology, Psychobiology, and Methodology of Behavioral Sciences, Faculty of Psychology, University of Salamanca, 37005 Salamanca, Spain
| | - Teodoro del Ser
- Alzheimer Centre Reina Sofia—CIEN Foundation, Institute of Health Carlos III, 28031 Madrid, Spain;
| | - Sara Llamas-Velasco
- Instituto de Investigación Sanitaria Hospital 12 de Octubre (imas12), 28041 Madrid, Spain; (S.L.-V.); (A.V.-G.); (J.B.-L.)
- Department of Neurology, University Hospital 12 de Octubre, 28041 Madrid, Spain
| | - Alberto Villarejo-Galende
- Instituto de Investigación Sanitaria Hospital 12 de Octubre (imas12), 28041 Madrid, Spain; (S.L.-V.); (A.V.-G.); (J.B.-L.)
- Department of Neurology, University Hospital 12 de Octubre, 28041 Madrid, Spain
| | - Julián Benito-León
- Instituto de Investigación Sanitaria Hospital 12 de Octubre (imas12), 28041 Madrid, Spain; (S.L.-V.); (A.V.-G.); (J.B.-L.)
- Department of Neurology, University Hospital 12 de Octubre, 28041 Madrid, Spain
- Centro de Investigación Biomédica en Red Sobre Enfermedades Neurodegenerativas (CIBERNED), 28029 Madrid, Spain
- Department of Medicine, Faculty of Medicine, Complutense University, 28040 Madrid, Spain
| | - Félix Bermejo-Pareja
- Centro de Investigación Biomédica en Red Sobre Enfermedades Neurodegenerativas (CIBERNED), 28029 Madrid, Spain
- Department of Medicine, Faculty of Medicine, Complutense University, 28040 Madrid, Spain
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Chen S, Underwood BR, Cardinal RN, Chen X, Chen S, Amin J, Jin H, Huang J, Mueller C, Yan LL, Brayne C, Kuper H. Temporal trends in population attributable fractions of modifiable risk factors for dementia: a time-series study of the English Longitudinal Study of Ageing (2004-2019). BMC Med 2024; 22:268. [PMID: 38926751 PMCID: PMC11210022 DOI: 10.1186/s12916-024-03464-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Accepted: 06/03/2024] [Indexed: 06/28/2024] Open
Abstract
BACKGROUND Interest in modifiable risk factors (MRFs) for dementia is high, given the personal, social, and economic impact of the disorder, especially in ageing societies such as the United Kingdom. Exploring the population attributable fraction (PAF) of dementia attributable to MRFs and how this may have changed over time remains unclear. Unravelling the temporal dynamics of MRFs is crucial for informing the development of evidence-based and effective public health policies. This investigation examined the temporal trajectories of MRFs for dementia in England. METHODS We used data from the English Longitudinal Study of Ageing, a panel study over eight waves collected between 2004 and 2019 (76,904 interviews in total). We calculated the PAFs for twelve MRFs (including six early- to mid-life factors and six late-life factors), as recommended by the Lancet Commission, and the individual weighted PAFs (IW-PAFs) for each risk factor. Temporal trends were analysed to understand the changes in the overall PAF and IW-PAF over the study period. Subgroup analyses were conducted by sex and socioeconomic status (SES). RESULTS The overall PAF for dementia MRFs changed from 46.73% in 2004/2005 to 36.79% in 2018/2019, though this trend was not statistically significant. During 2004-2019, hypertension, with an average IW-PAF of 8.21%, was the primary modifiable determinant of dementia, followed by obesity (6.16%), social isolation (5.61%), hearing loss (4.81%), depression (4.72%), low education (4.63%), physical inactivity (3.26%), diabetes mellitus (2.49%), smoking (2.0%), excessive alcohol consumption (1.16%), air pollution (0.42%), and traumatic brain injury (TBI) (0.26%). During 2004-2019, only IW-PAFs of low education, social isolation, and smoking showed significant decreasing trends, while IW-PAFs of other factors either did not change significantly or increased (including TBI, diabetes mellitus, and air pollution). Upon sex-specific disaggregation, a higher overall PAF for MRFs was found among women, predominantly associated with later-life risk factors, most notably social isolation, depression, and physical inactivity. Additionally, hearing loss, classified as an early- to mid-life factor, played a supplementary role in the identified sex disparity. A comparable discrepancy was evident upon PAF evaluation by SES, with lower income groups experiencing a higher dementia risk, largely tied to later-life factors such as social isolation, physical inactivity, depression, and smoking. Early- to mid-life factors, in particular, low education and obesity, were also observed to contribute to the SES-associated divergence in dementia risk. Temporal PAF and IW-PAF trends, stratified by sex and SES, revealed that MRF PAF gaps across sex or SES categories have persisted or increased. CONCLUSIONS In England, there was little change over time in the proportion of dementia attributable to known modifiable risk factors. The observed trends underscore the continuing relevance of these risk factors and the need for targeted public health strategies to address them.
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Affiliation(s)
- Shanquan Chen
- International Centre for Evidence in Disability, London, School of Hygiene & Tropical Medicine , London, WC1E 7HT, UK.
| | - Benjamin R Underwood
- Department of Psychiatry, University of Cambridge, Cambridge, CB2 0SZ, UK
- Cambridgeshire and Peterborough NHS Foundation Trust, Cambridge, CB21 5EF, UK
| | - Rudolf N Cardinal
- Department of Psychiatry, University of Cambridge, Cambridge, CB2 0SZ, UK
- Cambridgeshire and Peterborough NHS Foundation Trust, Cambridge, CB21 5EF, UK
| | - Xi Chen
- School of Public Health, Yale University, New Haven, CT, USA
| | - Shu Chen
- The ARC Centre of Excellence in Population Ageing Research (CEPAR), School of Risk and Actuarial Studies, University of New South Wales, Sydney, Australia
| | - Jay Amin
- Clinical Neurosciences, Faculty of Medicine, University of Southampton, Southampton, UK
- Southern Health NHS Foundation Trust, Southampton, UK
| | - Huajie Jin
- King's Health Economics, Institute of Psychiatry, Psychology & Neuroscience at King's College London, London, UK
| | - Jing Huang
- Department of Occupational and Environmental Health Sciences, Peking University School of Public Health, Beijing, China
- Institute for Global Health and Development, Peking University , Beijing, China
| | - Christoph Mueller
- King's College London, London, UK
- South London and Maudsley NHS Foundation Trust, London, UK
| | - Lijing L Yan
- Institute for Global Health and Development, Peking University , Beijing, China
- Global Health Research Center, Duke Kunshan University, Jiangsu, China
- School of Public Health, Wuhan University, Wuhan, China
- Duke Global Health Institute, Duke University, Durham, NC, USA
- Department of Preventive Medicine, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Carol Brayne
- Institute of Public Health, Forvie Site, University of Cambridge, Cambridge, CB2 2SR, UK
| | - Hannah Kuper
- International Centre for Evidence in Disability, London, School of Hygiene & Tropical Medicine , London, WC1E 7HT, UK
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Stephan BCM, Cochrane L, Kafadar AH, Brain J, Burton E, Myers B, Brayne C, Naheed A, Anstey KJ, Ashor AW, Siervo M. Population attributable fractions of modifiable risk factors for dementia: a systematic review and meta-analysis. THE LANCET. HEALTHY LONGEVITY 2024; 5:e406-e421. [PMID: 38824956 PMCID: PMC11139659 DOI: 10.1016/s2666-7568(24)00061-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 03/20/2024] [Accepted: 03/25/2024] [Indexed: 06/04/2024] Open
Abstract
BACKGROUND More than 57 million people have dementia worldwide. Evidence indicates a change in dementia prevalence and incidence in high-income countries, which is likely to be due to improved life-course population health. Identifying key modifiable risk factors for dementia is essential for informing risk reduction and prevention strategies. We therefore aimed to estimate the population attributable fraction (PAF) for dementia associated with modifiable risk factors. METHODS In this systematic review and meta-analysis, we searched Embase, MEDLINE, and PsycINFO, via Ovid, from database inception up to June 29, 2023, for population-derived or community-based studies and reviews reporting a PAF value for one or more modifiable risk factor for later-life dementia (prevalent or incident dementia in people aged ≥60 years), with no restrictions on dementia subtype, the sex or baseline age of participants, or the period of study. Articles were independently screened for inclusion by four authors, with disagreements resolved through consensus. Data including unweighted and weighted PAF values (weighted to account for communality or overlap in risk) were independently extracted into a predefined template by two authors and checked by two other authors. When five or more unique studies investigated a given risk factor or combination of the same factors, random-effects meta-analyses were used to calculate a pooled PAF percentage estimate for the factor or combination of factors. The review protocol was registered on PROSPERO, CRD42022323429. FINDINGS 4024 articles were identified, and 74 were included in our narrative synthesis. Overall, PAFs were reported for 61 modifiable risk factors, with sufficient data available for meta-analysis of 12 factors (n=48 studies). In meta-analyses, the highest pooled unweighted PAF values were estimated for low education (17·2% [95% CI 14·4-20·0], p<0·0001), hypertension (15·8% [14·7-17·1], p<0·0001), hearing loss (15·6% [10·3-20·9], p<0·0001), physical inactivity (15·2% [12·8-17·7], p<0·0001), and obesity (9·4% [7·3-11·7], p<0·0001). According to weighted PAF values, low education (9·3% [6·9-11·7], p<0·0001), physical inactivity (7·3% [3·9-11·2], p=0·0021), hearing loss (7·2% [5·2-9·7], p<0·0001), hypertension (7·1% [5·4-8·8], p<0·0001), and obesity (5·3% [3·2-7·4], p=0·0001) had the highest pooled estimates. When low education, midlife hypertension, midlife obesity, smoking, physical inactivity, depression, and diabetes were combined (Barnes and Yaffe seven-factor model; n=9 studies), the pooled unweighted and weighted PAF values were 55·0% (46·5-63·5; p<0·0001) and 32·0% (26·6-37·5; p<0·0001), respectively. The pooled PAF values for most individual risk factors were higher in low-income and middle-income countries (LMICs) versus high-income countries. INTERPRETATION Governments need to invest in a life-course approach to dementia prevention, including policies that enable quality education, health-promoting environments, and improved health. This investment is particularly important in LMICs, where the potential for prevention is high, but resources, infrastructure, budgets, and research focused on ageing and dementia are limited. FUNDING UK Research and Innovation (Medical Research Council).
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Affiliation(s)
- Blossom C M Stephan
- Dementia Centre of Excellence, Curtin enAble Institute, Faculty of Health Sciences, Curtin University, Perth, WA, Australia; Institute of Mental Health, The University of Nottingham Medical School, Nottingham, UK.
| | - Louie Cochrane
- Institute of Mental Health, The University of Nottingham Medical School, Nottingham, UK
| | | | - Jacob Brain
- Institute of Mental Health, The University of Nottingham Medical School, Nottingham, UK; Freemasons Foundation Centre for Men's Health, Discipline of Medicine, School of Psychology, The University of Adelaide, Adelaide, SA, Australia
| | - Elissa Burton
- Dementia Centre of Excellence, Curtin enAble Institute, Faculty of Health Sciences, Curtin University, Perth, WA, Australia; Curtin School of Allied Health, Faculty of Health Sciences, Curtin University, Perth, WA, Australia
| | - Bronwyn Myers
- Dementia Centre of Excellence, Curtin enAble Institute, Faculty of Health Sciences, Curtin University, Perth, WA, Australia; Mental Health, Alcohol, Substance Use, and Tobacco Research Unit, South African Medical Research Council, Tygerberg, South Africa; Division of Addiction Psychiatry, Department of Psychiatry and Mental Health, University of Cape Town, Cape Town, South Africa
| | - Carol Brayne
- Cambridge Public Health, University of Cambridge, Cambridge, UK
| | - Aliya Naheed
- Non-Communicable Diseases, Nutrition Research Division, International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh
| | - Kaarin J Anstey
- UNSW Ageing Futures Institute, University of New South Wales, Sydney, NSW, Australia; Brain Health and Dementia Centre, Neuroscience Research Australia, Sydney, NSW, Australia
| | - Ammar W Ashor
- Department of Internal Medicine, College of Medicine, Mustansiriyah University, Baghdad, Iraq
| | - Mario Siervo
- Dementia Centre of Excellence, Curtin enAble Institute, Faculty of Health Sciences, Curtin University, Perth, WA, Australia; School of Population Health, Curtin University, Perth, WA, Australia
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Chen S, Chen X, Hou X, Fang H, Liu GG, Yan LL. Temporal trends and disparities of population attributable fractions of modifiable risk factors for dementia in China: a time-series study of the China health and retirement longitudinal study (2011-2018). THE LANCET REGIONAL HEALTH. WESTERN PACIFIC 2024; 47:101106. [PMID: 38872868 PMCID: PMC11170192 DOI: 10.1016/j.lanwpc.2024.101106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Revised: 04/06/2024] [Accepted: 05/16/2024] [Indexed: 06/15/2024]
Abstract
Background In China, dementia poses a significant public health challenge, exacerbated by an ageing population and lifestyle changes. This study assesses the temporal trends and disparities in the population-attributable fractions (PAFs) of modifiable risk factors (MRFs) for new-onset dementia from 2011 to 2018. Methods We used data from the China Health and Retirement Longitudinal Study (CHARLS), covering 75,214 person-waves. We calculated PAFs for 12 MRFs identified by the Lancet Commission (including six early-to mid-life factors and six late-life factors). We also determined the individual weighted PAFs (IW-PAFs) for each risk factor. Subgroup analyses were conducted by sex, socio-economic status (SES), and geographic location. Findings The overall PAF for dementia MRFs had a slight increase from 45.36% in 2011 to 52.46% in 2018, yet this change wasn't statistically significant. During 2011-2018, the most contributing modifiable risk was low education (average IW-PAF 11.3%), followed by depression, hypertension, smoking, and physical inactivity. Over the eight-year period, IW-PAFs for risk factors like low education, hypertension, hearing loss, smoking, and air pollution showed decreasing trends, while others increased, but none of these changes were statistically significant. Sex-specific analysis revealed higher IW-PAFs for traumatic brain injury (TBI), social isolation, and depression in women, and for alcohol and smoking in men. The decline in IW-PAF for men's hearing loss were significant. Lower-income individuals had higher overall MRF PAFs, largely due to later-life factors like depression. Early-life factors, such as TBI and low education, also contributed to SES disparities. Rural areas reported higher overall MRF PAFs, driven by factors like depression, low education, and hearing loss. The study also found that the gap in MRF PAFs across different SES groups or regions either remained constant or increased over the study period. Interpretation The study reveals a slight but non-significant increase in dementia's MRF PAF in China, underscoring the persistent relevance of these risk factors. The findings highlight the need for targeted public health strategies, considering the demographic and regional differences, to effectively tackle and reduce dementia risk in China's diverse population. Funding This work was supported by the PKU Young Scholarship in Global Health and Development.
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Affiliation(s)
- Shanquan Chen
- International Centre for Evidence in Disability, London School of Hygiene & Tropical Medicine, London WC1E 7HT, United Kingdom
- Institute for Global Health and Development, Peking University, Beijing, China
| | - Xi Chen
- School of Public Health, Yale University, New Haven, CT, United States
| | | | - Hai Fang
- Institute for Global Health and Development, Peking University, Beijing, China
- China Center for Health Development Studies, Peking University, Beijing, China
| | - Gordon G. Liu
- Institute for Global Health and Development, Peking University, Beijing, China
| | - Lijing L. Yan
- Institute for Global Health and Development, Peking University, Beijing, China
- Global Health Research Center, Duke Kunshan University, Jiangsu, China
- School of Public Health, Wuhan University, Wuhan, China
- Duke Global Health Institute, Duke University, Durham, NC, United States
- Department of Preventive Medicine, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States
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Avan A, Nucera A, Stranges S, Rocca WA, Logroscino G, Leonardi M, Raggi A, Hachinski V. Risk and sex-specific trends of dementia and stroke in Italy Compared to European and high-income countries and the world: global implications. J Neurol 2024; 271:2745-2757. [PMID: 38388926 DOI: 10.1007/s00415-024-12216-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Revised: 12/20/2023] [Accepted: 01/20/2024] [Indexed: 02/24/2024]
Abstract
BACKGROUND Understanding the increasing trends in Italy may inform new prevention strategies and better treatments. We investigated trends and risk factors of dementia, stroke, and ischemic heart disease (IHD) in Italy with the second-oldest population globally, compared to European and high-income countries and the world. METHODS We analyzed the Global Burden of Disease Study (GBD) 2019 estimates on incidence and burden (i.e., disability and death combined) of the three conditions in both sexes. We also analyzed the burden attributable to 12 modifiable risk factors and their changes during 1990-2019. RESULTS In 2019, Italy had 186,108 new dementias (123,885 women) and 94,074 new strokes (53,572 women). Women had 98% higher crude dementia and 24% higher crude stroke burdens than men. The average age-standardized new dementia rate was 114.7 per 100,000 women and 88.4 per 100,000 men, both higher than Western Europe, the European Union, high-income countries, and the world. During 1990-2019, this rate increased in both sexes (4%), despite a decline in stroke (- 45%) and IHD (- 17%) in Italy. Dementia burden attributable to tobacco decreased in both sexes (- 12.7%) during 1990-2019, while high blood glucose and high body mass index combined burden increased (25.4%). Stroke and IHD had similar trends. CONCLUSIONS While decreases in new strokes and IHDs are encouraging, new approaches to their joint prevention are required to reverse the rising dementia trends, especially among women. Life course approaches to promoting holistic brain health should be implemented at the community, national, and international levels before the growing trends become overwhelming.
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Affiliation(s)
- Abolfazl Avan
- Robarts Research Institute, University of Western Ontario, London, ON, Canada
- Department of Clinical Neurological Sciences, University of Western Ontario, London, ON, Canada
- Department of Epidemiology and Biostatistics, University of Western Ontario, London, ON, Canada
| | - Antonia Nucera
- Neurovascular Treatment Unit, Spaziani Hospital, Frosinone, Italy
| | - Saverio Stranges
- Department of Epidemiology and Biostatistics, University of Western Ontario, London, ON, Canada
- Department of Family Medicine and Medicine, University of Western Ontario, London, Canada
- Department of Clinical Medicine and Surgery, Federico II University, Naples, Italy
- The Africa Institute, University of Western Ontario, London, Canada
| | - Walter A Rocca
- Division of Epidemiology, Department of Quantitative Health Sciences, Mayo Clinic, Rochester, MN, USA
- Department of Neurology, Mayo Clinic, Rochester, MN, USA
- Women's Health Research Center, Mayo Clinic, Rochester, MN, USA
| | - Giancarlo Logroscino
- Department of Translational Biomedicine and Neurosciences (DiBraiN), University of Bari Aldo Moro, Bari, Italy
- Center for Neurodegenerative Diseases, Aging Brain at Pia Fondazione "Card. G. Panico", University of Bari, Tricase (Lecce), Italy
| | - Matilde Leonardi
- Department of Neurology, Public Health, and Disability, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy
| | - Alberto Raggi
- Department of Neurology, Public Health, and Disability, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy
| | - Vladimir Hachinski
- Robarts Research Institute, University of Western Ontario, London, ON, Canada.
- Department of Clinical Neurological Sciences, University of Western Ontario, London, ON, Canada.
- Department of Epidemiology and Biostatistics, University of Western Ontario, London, ON, Canada.
- Department of Clinical Neurological Sciences, Robarts Research Institute, University of Western Ontario, 1151 Richmond St. N., London, ON, N6A 5B7, Canada.
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Dimtsu Assfaw A, Reinschmidt KM, Teasdale TA, Stephens L, Kleszynski KL, Dwyer K. Describing providers' perspectives on the needs and challenges of family caregivers of African American people living with dementia. Home Health Care Serv Q 2024; 43:133-153. [PMID: 38147405 DOI: 10.1080/01621424.2023.2299486] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2023]
Abstract
The primary purpose of this study was to explore the needs and challenges of African American family caregivers of People living with dementia (PLWD) from the perspective of service providers including healthcare and social service providers. The study conducted three online semi-structured focus group interviews with service providers (n = 15). Data were analyzed using Braun & Clarke's guide to thematic analysis approach. Five themes emerged from the analysis of the focus group data: (i) Inadequate information about resources; (ii) Dementia education; (iii) Burden of dementia on families; (iv) Limited financial support and funding; and (v) Suggestions for needed resources. Service providers expressed the lack of community-based dementia service and support programs in African American communities. Findings from the study indicated the need to provide culturally appropriate information on dementia caregiving. This study adds to the scope of knowledge by exploring the processes of seeking help and using services.
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Affiliation(s)
- Araya Dimtsu Assfaw
- Department of Neurology- Knight Alzheimer Disease Research Center, Washington University School of Medicine in St. Louis, St. Louis, USA
| | - Kerstin M Reinschmidt
- Department of Health Promotion Sciences, University of Oklahoma Health Sciences Center- Hudson College of Public Health, Oklahoma, USA
| | - Thomas A Teasdale
- Department of Health Promotion Sciences, University of Oklahoma Health Sciences Center- Hudson College of Public Health, Oklahoma, USA
| | - Lancer Stephens
- Department of Health Promotion Sciences, University of Oklahoma Health Sciences Center- Hudson College of Public Health, Oklahoma, USA
- Department of Health Promotion Sciences, Oklahoma Shared Clinical and Translational Research Center, Oklahoma, USA
| | - Keith L Kleszynski
- Department of Health Promotion Sciences, University of Oklahoma Health Sciences Center, Oklahoma, USA
| | - Kathleen Dwyer
- Population Health and Health Systems Science, University of Oklahoma Health Sciences Center- Fran and Earl Ziegler College of Nursing, Oklahoma, USA
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Gordon EH, Ward DD, Xiong H, Berkovsky S, Hubbard RE. Delirium and incident dementia in hospital patients in New South Wales, Australia: retrospective cohort study. BMJ 2024; 384:e077634. [PMID: 38537951 PMCID: PMC10966895 DOI: 10.1136/bmj-2023-077634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 02/22/2024] [Indexed: 04/06/2024]
Abstract
OBJECTIVES To determine the strength and nature of the association between delirium and incident dementia in a population of older adult patients without dementia at baseline. DESIGN Retrospective cohort study using large scale hospital administrative data. SETTING Public and private hospitals in New South Wales, Australia between July 2001 and March 2020. PARTICIPANTS Data were extracted for 650 590 hospital patients aged ≥65 years. Diagnoses of dementia and delirium were identified from ICD-10 (international classification of diseases, 10th revision) codes. Patients with dementia at baseline were excluded. Delirium-no delirium pairs were identified by matching personal and clinical characteristics, and were followed for more than five years. MAIN OUTCOME MEASURES Cox proportional hazards models and Fine-Gray hazard models were used to estimate the associations of delirium with death and incident dementia, respectively. Delirium-outcome dose-response associations were quantified, all analyses were performed in men and women separately, and sensitivity analyses were conducted. RESULTS The study included 55 211 matched pairs (48% men, mean age 83.4 years, standard deviation 6.5 years). Collectively, 58% (n=63 929) of patients died and 17% (n=19 117) had a newly reported dementia diagnosis during 5.25 years of follow-up. Patients with delirium had 39% higher risk of death (hazard ratio 1.39, 95% confidence interval 1.37 to 1.41) and three times higher risk of incident dementia (subdistribution hazard ratio 3.00, 95% confidence interval 2.91 to 3.10) than patients without delirium. The association with dementia was stronger in men (P=0.004). Each additional episode of delirium was associated with a 20% increased risk of dementia (subdistribution hazard ratio 1.20, 95% confidence interval 1.18 to 1.23). CONCLUSIONS The study findings suggest delirium was a strong risk factor for death and incident dementia among older adult patients. The data support a causal interpretation of the association between delirium and dementia. The clinical implications of delirium as a potentially modifiable risk factor for dementia are substantial.
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Affiliation(s)
- Emily H Gordon
- Centre for Health Services Research, The University of Queensland, Princess Alexandra Hospital, Woolloongabba, QLD, Australia
- Australian Frailty Network, The University of Queensland, Princess Alexandra Hospital, Woolloongabba, QLD, Australia
| | - David D Ward
- Centre for Health Services Research, The University of Queensland, Princess Alexandra Hospital, Woolloongabba, QLD, Australia
- Australian Frailty Network, The University of Queensland, Princess Alexandra Hospital, Woolloongabba, QLD, Australia
| | - Hao Xiong
- Centre for Health Informatics, Macquarie University, North Ryde, NSW, Australia
| | - Shlomo Berkovsky
- Centre for Health Informatics, Macquarie University, North Ryde, NSW, Australia
| | - Ruth E Hubbard
- Centre for Health Services Research, The University of Queensland, Princess Alexandra Hospital, Woolloongabba, QLD, Australia
- Australian Frailty Network, The University of Queensland, Princess Alexandra Hospital, Woolloongabba, QLD, Australia
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9
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Park SY, Setiawan VW, Crimmins EM, White LR, Wu AH, Cheng I, Darst BF, Haiman CA, Wilkens LR, Le Marchand L, Lim U. Racial and Ethnic Differences in the Population-Attributable Fractions of Alzheimer Disease and Related Dementias. Neurology 2024; 102:e208116. [PMID: 38232335 PMCID: PMC11097758 DOI: 10.1212/wnl.0000000000208116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Accepted: 11/22/2023] [Indexed: 01/19/2024] Open
Abstract
BACKGROUND AND OBJECTIVES Previous studies estimated that modifiable risk factors explain up to 40% of the dementia cases in the United States and that this population-attributable fraction (PAF) differs by race and ethnicity-estimates of future impact based on the risk factor prevalence in contemporary surveys. The aim of this study was to determine the race-specific and ethnicity-specific PAF of late-onset Alzheimer disease and related dementias (ADRDs) based on the risk factor prevalence and associations observed on the same individuals within a prospective cohort. METHODS Data were from Multiethnic Cohort Study participants (African American, Japanese American, Latino, Native Hawaiian, and White) enrolled in Medicare Fee-for-Service. We estimated the PAF based on the prevalence of risk factors at cohort baseline and their mutually adjusted association with subsequent ADRD incidence. Risk factors included low educational attainment and midlife exposures to low neighborhood socioeconomic status, unmarried status, history of hypertension, stroke, diabetes or heart disease, smoking, physical inactivity, short or long sleep duration, obesity, and low-quality diet, as well as APOE ε4 for a subset. RESULTS Among 91,881 participants (mean age 59.3 at baseline, 55.0% female participants), 16,507 incident ADRD cases were identified from Medicare claims (1999-2016, mean follow-up 9.3 years). The PAF for nongenetic factors combined was similar in men (24.0% [95% CI 21.3-26.6]) and women (22.8% [20.3-25.2]) but varied across Japanese American (14.2% [11.1-17.2]), White (21.9% [19.0-24.7]), African American (27.8% [22.3-33.0]), Native Hawaiian (29.3% [21.0-36.7]), and Latino (33.3% [27.5-38.5]) groups. The combined PAF was attenuated when accounting for competing risk of death, in both men (10.4%) and women (13.9%) and across racial and ethnic groups (4.7%-25.5%). The combined PAF was also different by age at diagnosis and ADRD subtypes, higher for younger (65-74 years: 43.2%) than older (75-84 years: 32.4%; ≥85 years: 11.3%) diagnoses and higher for vascular or unspecified ADRD than for AD or Lewy body dementia. An additional PAF of 11.8% (9.9-13.6) was associated with APOE ε4, which together with nongenetic risk factors accounted for 30.6% (25.8-35.1) of ADRD. DISCUSSION Known risk factors explained about a third of the ADRD cases but with unequal distributions across racial and ethnic groups.
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Affiliation(s)
- Song-Yi Park
- From the Population Sciences in the Pacific Program (S.-Y.P., L.R. Wilkens, L.L.M., U.L.), University of Hawaii Cancer Center, University of Hawaii at Manoa, Honolulu; Department of Population and Public Health Sciences (V.W.S., A.H.W., C.A.H.), Keck School of Medicine and Norris Comprehensive Cancer Center, and Leonard Davis School of Gerontology (E.M.C.), Andrus Gerontology Center, University of Southern California, Los Angeles; Pacific Health Research and Education Institute (L.R. White), Honolulu, HI; Department of Epidemiology and Biostatistics (I.C.), University of California, San Francisco; and Public Health Sciences Division (B.F.D.), Fred Hutchinson Cancer Center, Seattle, WA
| | - Veronica Wendy Setiawan
- From the Population Sciences in the Pacific Program (S.-Y.P., L.R. Wilkens, L.L.M., U.L.), University of Hawaii Cancer Center, University of Hawaii at Manoa, Honolulu; Department of Population and Public Health Sciences (V.W.S., A.H.W., C.A.H.), Keck School of Medicine and Norris Comprehensive Cancer Center, and Leonard Davis School of Gerontology (E.M.C.), Andrus Gerontology Center, University of Southern California, Los Angeles; Pacific Health Research and Education Institute (L.R. White), Honolulu, HI; Department of Epidemiology and Biostatistics (I.C.), University of California, San Francisco; and Public Health Sciences Division (B.F.D.), Fred Hutchinson Cancer Center, Seattle, WA
| | - Eileen M Crimmins
- From the Population Sciences in the Pacific Program (S.-Y.P., L.R. Wilkens, L.L.M., U.L.), University of Hawaii Cancer Center, University of Hawaii at Manoa, Honolulu; Department of Population and Public Health Sciences (V.W.S., A.H.W., C.A.H.), Keck School of Medicine and Norris Comprehensive Cancer Center, and Leonard Davis School of Gerontology (E.M.C.), Andrus Gerontology Center, University of Southern California, Los Angeles; Pacific Health Research and Education Institute (L.R. White), Honolulu, HI; Department of Epidemiology and Biostatistics (I.C.), University of California, San Francisco; and Public Health Sciences Division (B.F.D.), Fred Hutchinson Cancer Center, Seattle, WA
| | - Lon R White
- From the Population Sciences in the Pacific Program (S.-Y.P., L.R. Wilkens, L.L.M., U.L.), University of Hawaii Cancer Center, University of Hawaii at Manoa, Honolulu; Department of Population and Public Health Sciences (V.W.S., A.H.W., C.A.H.), Keck School of Medicine and Norris Comprehensive Cancer Center, and Leonard Davis School of Gerontology (E.M.C.), Andrus Gerontology Center, University of Southern California, Los Angeles; Pacific Health Research and Education Institute (L.R. White), Honolulu, HI; Department of Epidemiology and Biostatistics (I.C.), University of California, San Francisco; and Public Health Sciences Division (B.F.D.), Fred Hutchinson Cancer Center, Seattle, WA
| | - Anna H Wu
- From the Population Sciences in the Pacific Program (S.-Y.P., L.R. Wilkens, L.L.M., U.L.), University of Hawaii Cancer Center, University of Hawaii at Manoa, Honolulu; Department of Population and Public Health Sciences (V.W.S., A.H.W., C.A.H.), Keck School of Medicine and Norris Comprehensive Cancer Center, and Leonard Davis School of Gerontology (E.M.C.), Andrus Gerontology Center, University of Southern California, Los Angeles; Pacific Health Research and Education Institute (L.R. White), Honolulu, HI; Department of Epidemiology and Biostatistics (I.C.), University of California, San Francisco; and Public Health Sciences Division (B.F.D.), Fred Hutchinson Cancer Center, Seattle, WA
| | - Iona Cheng
- From the Population Sciences in the Pacific Program (S.-Y.P., L.R. Wilkens, L.L.M., U.L.), University of Hawaii Cancer Center, University of Hawaii at Manoa, Honolulu; Department of Population and Public Health Sciences (V.W.S., A.H.W., C.A.H.), Keck School of Medicine and Norris Comprehensive Cancer Center, and Leonard Davis School of Gerontology (E.M.C.), Andrus Gerontology Center, University of Southern California, Los Angeles; Pacific Health Research and Education Institute (L.R. White), Honolulu, HI; Department of Epidemiology and Biostatistics (I.C.), University of California, San Francisco; and Public Health Sciences Division (B.F.D.), Fred Hutchinson Cancer Center, Seattle, WA
| | - Burcu F Darst
- From the Population Sciences in the Pacific Program (S.-Y.P., L.R. Wilkens, L.L.M., U.L.), University of Hawaii Cancer Center, University of Hawaii at Manoa, Honolulu; Department of Population and Public Health Sciences (V.W.S., A.H.W., C.A.H.), Keck School of Medicine and Norris Comprehensive Cancer Center, and Leonard Davis School of Gerontology (E.M.C.), Andrus Gerontology Center, University of Southern California, Los Angeles; Pacific Health Research and Education Institute (L.R. White), Honolulu, HI; Department of Epidemiology and Biostatistics (I.C.), University of California, San Francisco; and Public Health Sciences Division (B.F.D.), Fred Hutchinson Cancer Center, Seattle, WA
| | - Christopher A Haiman
- From the Population Sciences in the Pacific Program (S.-Y.P., L.R. Wilkens, L.L.M., U.L.), University of Hawaii Cancer Center, University of Hawaii at Manoa, Honolulu; Department of Population and Public Health Sciences (V.W.S., A.H.W., C.A.H.), Keck School of Medicine and Norris Comprehensive Cancer Center, and Leonard Davis School of Gerontology (E.M.C.), Andrus Gerontology Center, University of Southern California, Los Angeles; Pacific Health Research and Education Institute (L.R. White), Honolulu, HI; Department of Epidemiology and Biostatistics (I.C.), University of California, San Francisco; and Public Health Sciences Division (B.F.D.), Fred Hutchinson Cancer Center, Seattle, WA
| | - Lynne R Wilkens
- From the Population Sciences in the Pacific Program (S.-Y.P., L.R. Wilkens, L.L.M., U.L.), University of Hawaii Cancer Center, University of Hawaii at Manoa, Honolulu; Department of Population and Public Health Sciences (V.W.S., A.H.W., C.A.H.), Keck School of Medicine and Norris Comprehensive Cancer Center, and Leonard Davis School of Gerontology (E.M.C.), Andrus Gerontology Center, University of Southern California, Los Angeles; Pacific Health Research and Education Institute (L.R. White), Honolulu, HI; Department of Epidemiology and Biostatistics (I.C.), University of California, San Francisco; and Public Health Sciences Division (B.F.D.), Fred Hutchinson Cancer Center, Seattle, WA
| | - Loїc Le Marchand
- From the Population Sciences in the Pacific Program (S.-Y.P., L.R. Wilkens, L.L.M., U.L.), University of Hawaii Cancer Center, University of Hawaii at Manoa, Honolulu; Department of Population and Public Health Sciences (V.W.S., A.H.W., C.A.H.), Keck School of Medicine and Norris Comprehensive Cancer Center, and Leonard Davis School of Gerontology (E.M.C.), Andrus Gerontology Center, University of Southern California, Los Angeles; Pacific Health Research and Education Institute (L.R. White), Honolulu, HI; Department of Epidemiology and Biostatistics (I.C.), University of California, San Francisco; and Public Health Sciences Division (B.F.D.), Fred Hutchinson Cancer Center, Seattle, WA
| | - Unhee Lim
- From the Population Sciences in the Pacific Program (S.-Y.P., L.R. Wilkens, L.L.M., U.L.), University of Hawaii Cancer Center, University of Hawaii at Manoa, Honolulu; Department of Population and Public Health Sciences (V.W.S., A.H.W., C.A.H.), Keck School of Medicine and Norris Comprehensive Cancer Center, and Leonard Davis School of Gerontology (E.M.C.), Andrus Gerontology Center, University of Southern California, Los Angeles; Pacific Health Research and Education Institute (L.R. White), Honolulu, HI; Department of Epidemiology and Biostatistics (I.C.), University of California, San Francisco; and Public Health Sciences Division (B.F.D.), Fred Hutchinson Cancer Center, Seattle, WA
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10
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Kalaria RN, Akinyemi RO, Paddick SM, Ihara M. Current perspectives on prevention of vascular cognitive impairment and promotion of vascular brain health. Expert Rev Neurother 2024; 24:25-44. [PMID: 37916306 PMCID: PMC10872925 DOI: 10.1080/14737175.2023.2273393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Accepted: 10/17/2023] [Indexed: 11/03/2023]
Abstract
INTRODUCTION The true global burden of vascular cognitive impairment (VCI) is unknown. Reducing risk factors for stroke and cardiovascular disease would inevitably curtail VCI. AREAS COVERED The authors review current diagnosis, epidemiology, and risk factors for VCI. VCI increases in older age and by inheritance of known genetic traits. They emphasize modifiable risk factors identified by the 2020 Lancet Dementia Commission. The most profound risks for VCI also include lower education, cardiometabolic factors, and compromised cognitive reserve. Finally, they discuss pharmacological and non-pharmacological interventions. EXPERT OPINION By virtue of the high frequencies of stroke and cardiovascular disease the global prevalence of VCI is expectedly higher than prevalent neurodegenerative disorders causing dementia. Since ~ 90% of the global burden of stroke can be attributed to modifiable risk factors, a formidable opportunity arises to reduce the burden of not only stroke but VCI outcomes including progression from mild to the major in form of vascular dementia. Strict control of vascular risk factors and secondary prevention of cerebrovascular disease via pharmacological interventions will impact on burden of VCI. Non-pharmacological measures by adopting healthy diets and encouraging physical and cognitive activities and urging multidomain approaches are important for prevention of VCI and preservation of vascular brain health.
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Affiliation(s)
- Raj N Kalaria
- Translational and Clinical Research Institute, Newcastle University, Newcastle upon Tyne, UK
| | - Rufus O Akinyemi
- Neuroscience and Ageing Research Unit, Institute for Advanced Medical Research and Training, College of Medicine, University of Ibadan, Ibadan, Nigeria
| | - Stella-Maria Paddick
- Translational and Clinical Research Institute, Newcastle University, Newcastle upon Tyne, UK
| | - Masafumi Ihara
- Department of Neurology, National Cerebral and Cardiovascular Centre, Osaka, Japan
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11
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Granzotto A, Sensi SL. Once upon a time, the Amyloid Cascade Hypothesis. Ageing Res Rev 2024; 93:102161. [PMID: 38065226 DOI: 10.1016/j.arr.2023.102161] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Revised: 11/23/2023] [Accepted: 12/05/2023] [Indexed: 12/18/2023]
Abstract
Recent trials with monoclonal antibodies targeting amyloid-β (Aβ) in Alzheimer's disease (AD) have sparked a renewed interest in disease-modifying therapies. Despite their promise, these trials leave the issue open and posit some doubts about the validity of the Amyloid Cascade Hypothesis (ACH). While some scores of neurocognitive tests improved upon treatment, real-world clinical benefits were minimal. This Viewpoint discusses additional, often overlooked findings from these trials. We also emphasize the multifactorial nature of AD and the need for a broader research perspective beyond the simplistic disease model provided by the ACH.
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Affiliation(s)
- Alberto Granzotto
- Center for Advanced Studies and Technology - CAST, University G. d'Annunzio of Chieti-Pescara, Chieti, Italy; Department of Neuroscience, Imaging, and Clinical Sciences, University G. d'Annunzio of Chieti-Pescara, Chieti, Italy.
| | - Stefano L Sensi
- Center for Advanced Studies and Technology - CAST, University G. d'Annunzio of Chieti-Pescara, Chieti, Italy; Department of Neuroscience, Imaging, and Clinical Sciences, University G. d'Annunzio of Chieti-Pescara, Chieti, Italy; Institute for Advanced Biomedical Technologies - ITAB, University G. d'Annunzio of Chieti-Pescara, Chieti, Italy
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12
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Anderson C, Bucholc M, McClean PL, Zhang SD. The Potential of a Stratified Approach to Drug Repurposing in Alzheimer's Disease. Biomolecules 2023; 14:11. [PMID: 38275752 PMCID: PMC10813465 DOI: 10.3390/biom14010011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Revised: 12/13/2023] [Accepted: 12/15/2023] [Indexed: 01/27/2024] Open
Abstract
Alzheimer's disease (AD) is a complex neurodegenerative condition that is characterized by the build-up of amyloid-beta plaques and neurofibrillary tangles. While multiple theories explaining the aetiology of the disease have been suggested, the underlying cause of the disease is still unknown. Despite this, several modifiable and non-modifiable factors that increase the risk of developing AD have been identified. To date, only eight AD drugs have ever gained regulatory approval, including six symptomatic and two disease-modifying drugs. However, not all are available in all countries and high costs associated with new disease-modifying biologics prevent large proportions of the patient population from accessing them. With the current patient population expected to triple by 2050, it is imperative that new, effective, and affordable drugs become available to patients. Traditional drug development strategies have a 99% failure rate in AD, which is far higher than in other disease areas. Even when a drug does reach the market, additional barriers such as high cost and lack of accessibility prevent patients from benefiting from them. In this review, we discuss how a stratified medicine drug repurposing approach may address some of the limitations and barriers that traditional strategies face in relation to drug development in AD. We believe that novel, stratified drug repurposing studies may expedite the discovery of alternative, effective, and more affordable treatment options for a rapidly expanding patient population in comparison with traditional drug development methods.
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Affiliation(s)
- Chloe Anderson
- Personalised Medicine Centre, School of Medicine, Altnagelvin Hospital Campus, Ulster University, Glenshane Road, Derry/Londonderry BT47 6SB, UK;
| | - Magda Bucholc
- School of Computing, Engineering and Intelligent Systems, Magee Campus, Ulster University, Northland Road, Derry/Londonderry BT48 7JL, UK
| | - Paula L. McClean
- Personalised Medicine Centre, School of Medicine, Altnagelvin Hospital Campus, Ulster University, Glenshane Road, Derry/Londonderry BT47 6SB, UK;
| | - Shu-Dong Zhang
- Personalised Medicine Centre, School of Medicine, Altnagelvin Hospital Campus, Ulster University, Glenshane Road, Derry/Londonderry BT47 6SB, UK;
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13
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Lloyd-Hazlegreaves P, Hayes L, Pearce MS. Associations between physical inactivity and dementia prevalence: ecological study using global data. Public Health 2023; 225:299-304. [PMID: 37956642 DOI: 10.1016/j.puhe.2023.10.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Revised: 09/22/2023] [Accepted: 10/05/2023] [Indexed: 11/15/2023]
Abstract
OBJECTIVES Given the predicted rise in dementia prevalence around the world, targeting modifiable risk factors (often lifestyle related) is a priority. This work sought to understand the role of physical inactivity (PI) as a modifiable risk factor for dementia. STUDY DESIGN Ecological study using globally available ecological data (both 2010 and 2016) from 192 countries. METHODS Age-standardised PI prevalence and dementia prevalence data were accessed from the World Health Organisation (WHO) and the Global Burden of Disease Study. Linear regression was used to assess the relationship between PI and dementia, with stratified analyses used to further explore the impact of sex, WHO region, and World Bank income group on the relationship. RESULTS Linear regression showed a positive association between inactivity and dementia prevalence in 2010 (b = 1.38 [95% confidence interval {CI}: 0.04, 2.71] P = 0.044) and 2016 (coefficient = 2.52 [95% CI: 1.07, 3.96] P = 0.0007). Sub-group analyses of sex-specific data showed the strength of the relationship was stronger in men than in women. Rates of both dementia and inactivity rose with increasing world income group. CONCLUSIONS This analysis of global data indicates the presence of a positive relationship between prevalence of PI and dementia prevalence, which has increased in strength with time, and is stronger in men than in women. This highlights the importance of public health interventions on a global scale to reduce the percentage of the population failing to reach or exceed the recommended physical activity guidelines.
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Affiliation(s)
| | - L Hayes
- Population Health Sciences Institute, Newcastle University, UK
| | - M S Pearce
- Population Health Sciences Institute, Newcastle University, UK.
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14
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Ramezani M, Fernando M, Eslick S, Asih PR, Shadfar S, Bandara EMS, Hillebrandt H, Meghwar S, Shahriari M, Chatterjee P, Thota R, Dias CB, Garg ML, Martins RN. Ketone bodies mediate alterations in brain energy metabolism and biomarkers of Alzheimer's disease. Front Neurosci 2023; 17:1297984. [PMID: 38033541 PMCID: PMC10687427 DOI: 10.3389/fnins.2023.1297984] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Accepted: 10/30/2023] [Indexed: 12/02/2023] Open
Abstract
Alzheimer's disease (AD) is the most common form of dementia. AD is a progressive neurodegenerative disorder characterized by cognitive dysfunction, including learning and memory deficits, and behavioral changes. Neuropathology hallmarks of AD such as amyloid beta (Aβ) plaques and neurofibrillary tangles containing the neuron-specific protein tau is associated with changes in fluid biomarkers including Aβ, phosphorylated tau (p-tau)-181, p-tau 231, p-tau 217, glial fibrillary acidic protein (GFAP), and neurofilament light (NFL). Another pathological feature of AD is neural damage and hyperactivation of astrocytes, that can cause increased pro-inflammatory mediators and oxidative stress. In addition, reduced brain glucose metabolism and mitochondrial dysfunction appears up to 15 years before the onset of clinical AD symptoms. As glucose utilization is compromised in the brain of patients with AD, ketone bodies (KBs) may serve as an alternative source of energy. KBs are generated from the β-oxidation of fatty acids, which are enhanced following consumption of ketogenic diets with high fat, moderate protein, and low carbohydrate. KBs have been shown to cross the blood brain barrier to improve brain energy metabolism. This review comprehensively summarizes the current literature on how increasing KBs support brain energy metabolism. In addition, for the first time, this review discusses the effects of ketogenic diet on the putative AD biomarkers such as Aβ, tau (mainly p-tau 181), GFAP, and NFL, and discusses the role of KBs on neuroinflammation, oxidative stress, and mitochondrial metabolism.
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Affiliation(s)
- Matin Ramezani
- Macquarie Medical School, Faculty of Medicine, Health and Human Sciences, Macquarie University, Macquarie, NSW, Australia
| | - Malika Fernando
- Macquarie Medical School, Faculty of Medicine, Health and Human Sciences, Macquarie University, Macquarie, NSW, Australia
| | - Shaun Eslick
- Macquarie Medical School, Faculty of Medicine, Health and Human Sciences, Macquarie University, Macquarie, NSW, Australia
| | - Prita R. Asih
- Macquarie Medical School, Faculty of Medicine, Health and Human Sciences, Macquarie University, Macquarie, NSW, Australia
- Flinders Health and Medical Research Institute, College of Medicine and Public Health, Flinders University, Adelaide, SA, Australia
| | - Sina Shadfar
- Motor Neuron Disease Research Centre, Macquarie Medical School, Faculty of Medicine, Health and Human Sciences, Macquarie University, Sydney, NSW, Australia
| | | | - Heidi Hillebrandt
- Macquarie Medical School, Faculty of Medicine, Health and Human Sciences, Macquarie University, Macquarie, NSW, Australia
| | - Silochna Meghwar
- Macquarie Medical School, Faculty of Medicine, Health and Human Sciences, Macquarie University, Macquarie, NSW, Australia
| | - Maryam Shahriari
- Macquarie Medical School, Faculty of Medicine, Health and Human Sciences, Macquarie University, Macquarie, NSW, Australia
| | - Pratishtha Chatterjee
- Macquarie Medical School, Faculty of Medicine, Health and Human Sciences, Macquarie University, Macquarie, NSW, Australia
| | - Rohith Thota
- Macquarie Medical School, Faculty of Medicine, Health and Human Sciences, Macquarie University, Macquarie, NSW, Australia
| | - Cintia B. Dias
- Macquarie Medical School, Faculty of Medicine, Health and Human Sciences, Macquarie University, Macquarie, NSW, Australia
| | - Manohar L. Garg
- Macquarie Medical School, Faculty of Medicine, Health and Human Sciences, Macquarie University, Macquarie, NSW, Australia
| | - Ralph N. Martins
- Macquarie Medical School, Faculty of Medicine, Health and Human Sciences, Macquarie University, Macquarie, NSW, Australia
- School of Medical and Health Sciences, Edith Cowan University, Joondalup, WA, Australia
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15
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Benyumiza D, Kumakech E, Gutu J, Banihani J, Mandap J, Talib ZM, Wakida EK, Maling S, Obua C. Prevalence of dementia and its association with central nervous system infections among older persons in northern Uganda: cross-sectional community-based study. BMC Geriatr 2023; 23:551. [PMID: 37697266 PMCID: PMC10496337 DOI: 10.1186/s12877-023-04174-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Accepted: 07/15/2023] [Indexed: 09/13/2023] Open
Abstract
BACKGROUND Dementia is a condition in which there is deterioration in cognitive function beyond what might be expected from the usual consequence of biological aging. Few studies have been conducted on the prevalence of dementia and its association with central nervous system (CNS) infections among older persons in African settings, particularly in Uganda. Therefore, this study assessed the prevalence of dementia and its association with CNS infections among older persons in Lira District, northern Uganda. METHODS This was a cross-sectional community-based study in Lira district northern Uganda. The study was conducted in March 2022 among 434 older persons aged 50 and above years who were selected by multistage sampling. Data were collected using an interviewer-administered questionnaire supplemented with information from participant's medical records and a brief community screening instrument for dementia. The instrument classifies dementia into unlikely, probable or possible dementia. Data were entered in duplicate into EpiData version 3.0, then transferred to Statistical Package for Social Sciences (SPSS) version 23 for statistical analysis. RESULTS Our study found almost one in four (23%) of the older persons in Lira district northern Uganda were suffering from probable or possible dementia. Our study further found that older persons in Lira district northern Uganda with a positive history of central nervous system infections (CNS) had nearly five times higher odds of having probable or possible dementia compared to their counterparts (cOR: 4.5; 2.76-7.23; p ≤ 0.001). Being in advanced age of 70 + years (aOR: 2.6; 1.6-4.3; p ≤ 0.001), positive history of CNS infection particularly Herpes simplex virus-1 (aOR: 5.4; 1.4-20.5; p = 0.013), and chronic headache (aOR: 1.9; 1.1-3.1; p = 0.019) were independent predictors of probable or possible dementia among participants in this study. CONCLUSION AND RECOMMENDATIONS Dementia is a common condition among older persons in Lira district northern Uganda with a prevalence of 23% in our study. Older persons with a positive history of CNS infection had higher odd of developing dementia compared to their counterparts. Having advanced age, cerebral malaria, Herpes simplex virus - 1 (HSV-1) infections, and chronic headache were independent predictors for dementia. These results imply that health assessment for the risk of dementia should include screening for history of CNS conditions particularly cerebral malaria, HSV-1 and chronic headache.
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Affiliation(s)
- Deo Benyumiza
- Department of Nursing and Midwifery, Faculty of Health Science, Lira University, Lira, Uganda
| | - Edward Kumakech
- Department of Nursing and Midwifery, Faculty of Health Science, Lira University, Lira, Uganda.
| | - Jastine Gutu
- Office of Health Professional Education Partnership Initiative - Transforming Ugandan Institution's Training Against HIV/AIDS (HEPI - TUITAH) program, Faculty of Health Science, Lira University, Lira, Uganda
| | - Jude Banihani
- Department of Medicine, California University of Science and Medicine, San Bernadinio, USA
| | - Joshua Mandap
- Department of Medicine, California University of Science and Medicine, San Bernadinio, USA
| | - Zohray M Talib
- Department of Medicine, California University of Science and Medicine, San Bernadinio, USA
- Office of Research Administration, Mbarara University of Science and Technology, P.O. BOX 1014, Mbarara, Uganda
| | - Edith K Wakida
- Department of Medicine, California University of Science and Medicine, San Bernadinio, USA
- Office of Research Administration, Mbarara University of Science and Technology, P.O. BOX 1014, Mbarara, Uganda
| | - Samuel Maling
- Office of Research Administration, Mbarara University of Science and Technology, P.O. BOX 1014, Mbarara, Uganda
- Department of Psychiatry, Faculty of Medicine, Mbarara University of Science and Technology, Mbarara, Uganda
| | - Celestino Obua
- Office of Research Administration, Mbarara University of Science and Technology, P.O. BOX 1014, Mbarara, Uganda
- Office of the Vice Chancellor, Mbarara University of Science and Technology, Mbarara, Uganda
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Singh SS, Zhong S, Rogers KA, Hachinski VC, Frisbee SJ. Prevalence of dementia, heart disease and stroke in community-dwelling adults in Canada, 2016-2021: opportunities for joint prevention. Arch Public Health 2023; 81:158. [PMID: 37620877 PMCID: PMC10464200 DOI: 10.1186/s13690-023-01171-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Accepted: 08/08/2023] [Indexed: 08/26/2023] Open
Abstract
INTRODUCTION This aim of this study is to provide updated estimates on the prevalence of dementia, heart disease, and stroke in Canadian communities. Targeting all three conditions together, at the community level, may be key to disease prevention and health aging in the Canadian population. METHODS Using nationwide health survey data, we calculated the age-standardized prevalence of self-reported dementia, heart disease and stroke in adults aged 18 years and over residing in Canadian communities from 2016 to 2021. Poisson regression models were used to detect statistically significant changes in the prevalence of all three conditions from 2016 to 2021. RESULTS Less than 1% (~ 175,000 individuals) of adults residing in Canadian communities reported dementia, 5% (~ 1.5 million individuals) reported heart disease, and more than 1% (~ 370,000 individuals) reported stroke annually from 2016 to 2021. Overall, the age-standardized prevalence for stroke decreased minimally from 2016 to 2021 (p = 0.0004). Although the age-standardized prevalence of heart disease and dementia decreased from 2016 to 2018, subsequent increases in prevalence from 2018 to 2021 led to a lack of overall statistically significant changes from 2016 to 2021 (p = 0.10 for heart disease and p = 0.37 for dementia). CONCLUSION Recent increases in the prevalence of dementia, heart disease and stroke in Canadian communities threaten to reverse any gains in vascular disease prevention over the past six years. Findings reveal the urgent need for intensified prevention efforts that are community-based with a focus on joint reduction in the shared risk factors contributing to all three diseases.
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Affiliation(s)
- Sarah S Singh
- Robarts Research Institute, University of Western Ontario, 100 Perth Dr, London, ON, N6A 5K8, Canada.
| | - Shiran Zhong
- Department of Geography, University of Western Ontario, London, ON, Canada
| | - Kem A Rogers
- Department of Anatomy & Cell Biology, Schulich School of Medicine & Dentistry, University of Western Ontario, London, ON, Canada
| | - Vladimir C Hachinski
- Robarts Research Institute, University of Western Ontario, 100 Perth Dr, London, ON, N6A 5K8, Canada
- Department of Clinical Neurological Sciences, and Epidemiology and Biostatistics, Schulich School of Medicine & Dentistry, University of Western Ontario, London, ON, Canada
| | - Stephanie J Frisbee
- Department of Pathology & Laboratory Medicine, and Epidemiology & Biostatistics, Schulich School of Medicine & Dentistry, University of Western Ontario, London, ON, Canada
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Sheffler JL, Kiosses DN, He Z, Arjmandi BH, Akhavan NS, Klejc K, Naar S. Improving Adherence to a Mediterranean Ketogenic Nutrition Program for High-Risk Older Adults: A Pilot Randomized Trial. Nutrients 2023; 15:nu15102329. [PMID: 37242211 PMCID: PMC10223314 DOI: 10.3390/nu15102329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2023] [Revised: 05/09/2023] [Accepted: 05/12/2023] [Indexed: 05/28/2023] Open
Abstract
(1) Background: Mediterranean ketogenic nutrition (MKN) may directly target multiple neurobiological mechanisms associated with dementia risk in older adults. Despite its promise, this type of nutrition can be challenging to learn and adhere to in a healthy manner. Our team used the National Institutes of Health Obesity Related Behavioral Intervention Trials (NIH ORBIT) model to develop and pilot a program to help older adults with memory concerns use MKN. (2) Methods: Using a two-arm, randomized design, we evaluated an MKN Adherence (MKNA) program compared to an MKN education (MKNE) program (N = 58). The primary difference between study arms involved the use of motivational interviewing (MI) strategies and behavior change techniques (BCT) only in the MKNA arm. Participants were included if they evidenced subjective memory concerns or objective memory impairment on the Montreal Cognitive Assessment (Score 19 ≤ 26). Primary outcomes examined included feasibility, acceptability, adherence, and clinical outcomes associated with the program. (3) Results: Overall, there was relatively high program completion in both groups, with 79% of participants completing the 6-week program. The recruitment protocol required adjustment but was successful in reaching the target sample size. Retention (82%) and session attendance (91%) were higher in the MKNA arm compared to the MKNE (retention = 72%; attendance = 77%). Overall, most participants in both groups rated the program as "excellent" using the client satisfaction questionnaire. Participants in the MKNA arm evidenced higher objective and self-reported adherence to MKN during the 6-week program. Further, there was some evidence of clinical benefits of the program, although these effects diminished as adherence decreased in the 3 months follow-up. (4) Discussion: This pilot trial demonstrated that the MKN program incorporating MI and BCT strategies may better engage and retain participants than a nutrition education program alone, although participants in both groups reported high satisfaction.
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Affiliation(s)
- Julia L Sheffler
- Center for Translational Behavioral Science, College of Medicine, Florida State University, Tallahassee, FL 32306, USA
| | - Dimitris N Kiosses
- Weill Cornell Institute of Geriatric Psychiatry, Weill Cornell Medical College, White Plains, NY 10605, USA
| | - Zhe He
- School of Information, Florida State University, Tallahassee, FL 32306, USA
| | - Bahram H Arjmandi
- College of Health and Human Sciences, Florida State University, Tallahassee, FL 32306, USA
| | - Neda S Akhavan
- College of Health and Human Sciences, Florida State University, Tallahassee, FL 32306, USA
| | - Kamelia Klejc
- Center for Translational Behavioral Science, College of Medicine, Florida State University, Tallahassee, FL 32306, USA
| | - Sylvie Naar
- Center for Translational Behavioral Science, College of Medicine, Florida State University, Tallahassee, FL 32306, USA
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18
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Hanrahan JG, Burford C, Nagappan P, Adegboyega G, Rajkumar S, Kolias A, Helmy A, Hutchinson PJ. Is dementia more likely following traumatic brain injury? A systematic review. J Neurol 2023; 270:3022-3051. [PMID: 36810827 DOI: 10.1007/s00415-023-11614-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Revised: 02/06/2023] [Accepted: 02/07/2023] [Indexed: 02/24/2023]
Abstract
BACKGROUND The association between traumatic brain injury (TBI) and dementia is controversial, and of growing importance considering the ageing demography of TBI. OBJECTIVE To review the scope and quality of the existing literature investigating the relationship between TBI and dementia. METHODS We conducted a systematic review following PRISMA guidelines. Studies that compared TBI exposure and dementia risk were included. Studies were formally assessed for quality with a validated quality-assessment tool. RESULTS 44 studies were included in the final analysis. 75% (n = 33) were cohort studies and data collection was predominantly retrospective (n = 30, 66.7%). 25 studies (56.8%) found a positive relationship between TBI and dementia. Clearly defined and valid measures of assessing TBI history were lacking (case-control studies-88.9%, cohort studies-52.9%). Most studies failed to justify a sample size (case-control studies-77.8%, cohort studies-91.2%), blind assessors to exposure (case-control-66.7%) or blind assessors to exposure status (cohort-3.00%). Studies that identified a relationship between TBI and dementia had a longer median follow-up time (120 months vs 48 months, p = 0.022) and were more likely to use validated TBI definitions (p = 0.01). Studies which clearly defined TBI exposure (p = 0.013) and accounted for TBI severity (p = 0.036) were also more likely to identify an association between TBI and dementia. There was no consensus method by which studies diagnosed dementia and neuropathological confirmation was only available in 15.5% of studies. CONCLUSIONS Our review suggests a relationship between TBI and dementia, but we are unable to predict the risk of dementia for an individual following TBI. Our conclusions are limited by heterogeneity in both exposure and outcome reporting and by poor study quality. Future studies should; (a) use validated methods to define TBI, accounting for TBI severity; (b) follow consensus agreement on criteria for dementia diagnosis; and (c) undertake follow-up that is both longitudinal, to determine if there is a progressive neurodegenerative change or static post-traumatic deficit, and of sufficient duration.
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Affiliation(s)
- John Gerrard Hanrahan
- Department of Clinical Neurosciences, University of Cambridge, Addenbrooke's Hospital, Cambridge, UK
| | - Charlotte Burford
- Department of General Surgery, East Kent University Hospitals NHS Foundation Trust, Ashford, UK.
| | - Palani Nagappan
- Department of Clinical Neurosciences, University of Cambridge, Addenbrooke's Hospital, Cambridge, UK
| | - Gideon Adegboyega
- Bart's and the London Medical School, Queen Mary University of London, London, UK
| | - Shivani Rajkumar
- Department of Clinical Neurosciences, University of Cambridge, Addenbrooke's Hospital, Cambridge, UK
| | - Angelos Kolias
- Department of Clinical Neurosciences, University of Cambridge, Addenbrooke's Hospital, Cambridge, UK
| | - Adel Helmy
- Department of Clinical Neurosciences, University of Cambridge, Addenbrooke's Hospital, Cambridge, UK
| | - Peter John Hutchinson
- Department of Clinical Neurosciences, University of Cambridge, Addenbrooke's Hospital, Cambridge, UK
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19
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Alkabbani W, Maxwell CJ, Marrie RA, Tyas SL, Lega IC, Gamble JM. Associations of Mid- and Late-Life Severe Hypoglycemic Episodes With Incident Dementia Among Patients With Type 2 Diabetes: A Population-Based Cohort Study. Diabetes Care 2023; 46:331-340. [PMID: 36516080 DOI: 10.2337/dc22-1496] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Accepted: 11/12/2022] [Indexed: 12/15/2022]
Abstract
OBJECTIVE Severe hypoglycemia is associated with an increased risk of dementia. We examined if the association is consistently present in mid- and late-life hypoglycemia. RESEARCH DESIGN AND METHODS Using health care data from Population Data BC, we created a base cohort of patients age ≥40 years with incident type 2 diabetes. Exposure was the first occurrence of severe hypoglycemia (hospitalization or physician visit). We assessed exposure versus no exposure in mid- (age 45-64 years) and late-life (age 65-84 years) cohorts. Index date was the later of the 45th birthday (midlife cohort), 65th birthday (late-life cohort), or diabetes diagnosis. Those with hypoglycemia or dementia before the index date were excluded. Patients were followed from index date until dementia diagnosis, death, emigration, or 31 December 2018. Exposure was modeled as time dependent. We adjusted for confounding using propensity score weighting. Dementia risk was estimated using cause-specific hazards models with death as a competing risk. RESULTS Of 221,683 patients in the midlife cohort, 1,793 experienced their first severe hypoglycemic event. Over a median of 9.14 years, 3,117 dementia outcomes occurred (32 among exposed). Of 223,940 patients in the late-life cohort, 2,466 experienced their first severe hypoglycemic event. Over a median of 6.7 years, 15,997 dementia outcomes occurred (158 among exposed). The rate of dementia was higher for those with (vs. without) hypoglycemia in both the mid- (hazard ratio 2.85; 95% CI 1.72-4.72) and late-life (2.38; 1.83-3.11) cohorts. CONCLUSIONS Both mid- and late-life hypoglycemia were associated with approximately double the risk of dementia, indicating the need for prevention throughout the life course of those with diabetes.
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Affiliation(s)
- Wajd Alkabbani
- School of Pharmacy, University of Waterloo, Waterloo, Ontario, Canada
| | - Colleen J Maxwell
- School of Pharmacy, University of Waterloo, Waterloo, Ontario, Canada
- School of Public Health Sciences, University of Waterloo, Waterloo, Ontario, Canada
| | - Ruth Ann Marrie
- Departments of Internal Medicine and Community Health Science, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Suzanne L Tyas
- School of Public Health Sciences, University of Waterloo, Waterloo, Ontario, Canada
| | - Iliana C Lega
- Women's College Research Institute, Women's College Hospital, Toronto, Ontario, Canada
- Department of Medicine, University of Toronto, Toronto, Ontario, Canada
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20
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Wang Y, Hu H, Liu X, Guo X. Hypoglycemic medicines in the treatment of Alzheimer's disease: Pathophysiological links between AD and glucose metabolism. Front Pharmacol 2023; 14:1138499. [PMID: 36909158 PMCID: PMC9995522 DOI: 10.3389/fphar.2023.1138499] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Accepted: 02/13/2023] [Indexed: 02/25/2023] Open
Abstract
Alzheimer's Disease (AD) is a global chronic disease in adults with beta-amyloid (Aβ) deposits and hyperphosphorylated tau protein as the pathologic characteristics. Although the exact etiology of AD is still not fully elucidated, aberrant metabolism including insulin signaling and mitochondria dysfunction plays an important role in the development of AD. Binding to insulin receptor substrates, insulin can transport through the blood-brain barrier (BBB), thus mediating insulin signaling pathways to regulate physiological functions. Impaired insulin signaling pathways, including PI3K/Akt/GSK3β and MAPK pathways, could cause damage to the brain in the pathogenesis of AD. Mitochondrial dysfunction and overexpression of TXNIP could also be causative links between AD and DM. Some antidiabetic medicines may have benefits in the treatment of AD. Metformin can be beneficial for cognition improvement in AD patients, although results from clinical trials were inconsistent. Exendin-4 may affect AD in animal models but there is a lack of clinical trials. Liraglutide and dulaglutide could also benefit AD patients in adequate clinical studies but not semaglutide. Dipeptidyl peptidase IV inhibitors (DPP4is) such as saxagliptin, vildagliptin, linagliptin, and sitagliptin could boost cognitive function in animal models. And SGLT2 inhibitors such as empagliflozin and dapagliflozin were also considerably protective against new-onset dementia in T2DM patients. Insulin therapy is a promising therapy but some studies indicated that it may increase the risk of AD. Herbal medicines are helpful for cognitive function and neuroprotection in the brain. For example, polyphenols, alkaloids, glycosides, and flavonoids have protective benefits in cognition function and glucose metabolism. Focusing on glucose metabolism, we summarized the pharmacological mechanism of hypoglycemic drugs and herbal medicines. New treatment approaches including antidiabetic synthesized drugs and herbal medicines would be provided to patients with AD. More clinical trials are needed to produce definite evidence for the effectiveness of hypoglycemic medications.
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Affiliation(s)
- Yixuan Wang
- Dongfang Hospital of Beijing University of Chinese Medicine, Beijing, China
| | - Hao Hu
- Dongfang Hospital of Beijing University of Chinese Medicine, Beijing, China
| | - Xinyu Liu
- Dongfang Hospital of Beijing University of Chinese Medicine, Beijing, China
| | - Xiangyu Guo
- Dongfang Hospital of Beijing University of Chinese Medicine, Beijing, China
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21
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Nutrition Strategies Promoting Healthy Aging: From Improvement of Cardiovascular and Brain Health to Prevention of Age-Associated Diseases. Nutrients 2022; 15:nu15010047. [PMID: 36615705 PMCID: PMC9824801 DOI: 10.3390/nu15010047] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 12/19/2022] [Accepted: 12/21/2022] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND An increasing number of studies suggest that diet plays an important role in regulating aging processes and modulates the development of the most important age-related diseases. OBJECTIVE The aim of this review is to provide an overview of the relationship between nutrition and critical age-associated diseases. METHODS A literature review was conducted to survey recent pre-clinical and clinical findings related to the role of nutritional factors in modulation of fundamental cellular and molecular mechanisms of aging and their role in prevention of the genesis of the diseases of aging. RESULTS Studies show that the development of cardiovascular and cerebrovascular diseases, neurodegenerative diseases, cognitive impairment and dementia can be slowed down or prevented by certain diets with anti-aging action. The protective effects of diets, at least in part, may be mediated by their beneficial macro- (protein, fat, carbohydrate) and micronutrient (vitamins, minerals) composition. CONCLUSIONS Certain diets, such as the Mediterranean diet, may play a significant role in healthy aging by preventing the onset of certain diseases and by improving the aging process itself. This latter can be strengthened by incorporating fasting elements into the diet. As dietary recommendations change with age, this should be taken into consideration as well, when developing a diet tailored to the needs of elderly individuals. Future and ongoing clinical studies on complex anti-aging dietary interventions translating the results of preclinical investigations are expected to lead to novel nutritional guidelines for older adults in the near future.
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22
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Atlante A, Amadoro G, Latina V, Valenti D. Therapeutic Potential of Targeting Mitochondria for Alzheimer's Disease Treatment. J Clin Med 2022; 11:6742. [PMID: 36431219 PMCID: PMC9697019 DOI: 10.3390/jcm11226742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 11/11/2022] [Accepted: 11/11/2022] [Indexed: 11/16/2022] Open
Abstract
Alzheimer's disease (AD), a chronic and progressive neurodegenerative disease, is characterized by memory and cognitive impairment and by the accumulation in the brain of abnormal proteins, more precisely beta-amyloid (β-amyloid or Aβ) and Tau proteins. Studies aimed at researching pharmacological treatments against AD have focused precisely on molecules capable, in one way or another, of preventing/eliminating the accumulations of the aforementioned proteins. Unfortunately, more than 100 years after the discovery of the disease, there is still no effective therapy in modifying the biology behind AD and nipping the disease in the bud. This state of affairs has made neuroscientists suspicious, so much so that for several years the idea has gained ground that AD is not a direct neuropathological consequence taking place downstream of the deposition of the two toxic proteins, but rather a multifactorial disease, including mitochondrial dysfunction as an early event in the pathogenesis of AD, occurring even before clinical symptoms. This is the reason why the search for pharmacological agents capable of normalizing the functioning of these subcellular organelles of vital importance for nerve cells is certainly to be considered a promising approach to the design of effective neuroprotective drugs aimed at preserving this organelle to arrest or delay the progression of the disease. Here, our intent is to provide an updated overview of the mitochondrial alterations related to this disorder and of the therapeutic strategies (both natural and synthetic) targeting mitochondrial dysfunction.
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Affiliation(s)
- Anna Atlante
- Institute of Biomembranes, Bioenergetics and Molecular Biotechnologies (IBIOM)-CNR, Via G. Amendola122/O, 70126 Bari, Italy
| | - Giuseppina Amadoro
- Institute of Translational Pharmacology (IFT)-CNR, Via Fosso del Cavaliere 100, 00133 Rome, Italy
| | - Valentina Latina
- European Brain Research Institute (EBRI), Viale Regina Elena 295, 00161 Rome, Italy
| | - Daniela Valenti
- Institute of Biomembranes, Bioenergetics and Molecular Biotechnologies (IBIOM)-CNR, Via G. Amendola122/O, 70126 Bari, Italy
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23
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Immunosenescence and Aging: Neuroinflammation Is a Prominent Feature of Alzheimer's Disease and Is a Likely Contributor to Neurodegenerative Disease Pathogenesis. J Pers Med 2022; 12:jpm12111817. [PMID: 36579548 PMCID: PMC9698256 DOI: 10.3390/jpm12111817] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2022] [Revised: 10/25/2022] [Accepted: 10/29/2022] [Indexed: 11/06/2022] Open
Abstract
Alzheimer's disease (AD) is a chronic multifactorial and complex neuro-degenerative disorder characterized by memory impairment and the loss of cognitive ability, which is a problem affecting the elderly. The pathological intracellular accumulation of abnormally phosphorylated Tau proteins, forming neurofibrillary tangles, and extracellular amyloid-beta (Aβ) deposition, forming senile plaques, as well as neural disconnection, neural death and synaptic dysfunction in the brain, are hallmark pathologies that characterize AD. The prevalence of the disease continues to increase globally due to the increase in longevity, quality of life, and medical treatment for chronic diseases that decreases the mortality and enhance the survival of elderly. Medical awareness and the accurate diagnosis of the disease also contribute to the high prevalence observed globally. Unfortunately, no definitive treatment exists that can be used to modify the course of AD, and no available treatment is capable of mitigating the cognitive decline or reversing the pathology of the disease as of yet. A plethora of hypotheses, ranging from the cholinergic theory and dominant Aβ cascade hypothesis to the abnormally excessive phosphorylated Tau protein hypothesis, have been reported. Various explanations for the pathogenesis of AD, such as the abnormal excitation of the glutamate system and mitochondrial dysfunction, have also been suggested. Despite the continuous efforts to deliver significant benefits and an effective treatment for this distressing, globally attested aging illness, multipronged approaches and strategies for ameliorating the disease course based on knowledge of the underpinnings of the pathogenesis of AD are urgently needed. Immunosenescence is an immune deficit process that appears with age (inflammaging process) and encompasses the remodeling of the lymphoid organs, leading to alterations in the immune function and neuroinflammation during advanced aging, which is closely linked to the outgrowth of infections, autoimmune diseases, and malignant cancers. It is well known that long-standing inflammation negatively influences the brain over the course of a lifetime due to the senescence of the immune system. Herein, we aim to trace the role of the immune system in the pathogenesis of AD. Thus, we explore alternative avenues, such as neuroimmune involvement in the pathogenesis of AD. We determine the initial triggers of neuroinflammation, which is an early episode in the pre-symptomatic stages of AD and contributes to the advancement of the disease, and the underlying key mechanisms of brain damage that might aid in the development of therapeutic strategies that can be used to combat this devastating disease. In addition, we aim to outline the ways in which different aspects of the immune system, both in the brain and peripherally, behave and thus to contribute to AD.
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24
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Schliep KC, Barbeau WA, Lynch KE, Sorweid MK, Varner MW, Foster NL, Qeadan F. Overall and sex-specific risk factors for subjective cognitive decline: findings from the 2015-2018 Behavioral Risk Factor Surveillance System Survey. Biol Sex Differ 2022; 13:16. [PMID: 35414037 PMCID: PMC9004039 DOI: 10.1186/s13293-022-00425-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Accepted: 03/31/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Prior research indicates that at least 35% of Alzheimer's disease and related dementia risk may be amenable to prevention. Subjective cognitive decline is often the first indication of preclinical dementia, with the risk of subsequent Alzheimer's disease in such individuals being greater in women than men. We wished to understand how modifiable factors are associated with subjective cognitive decline, and whether differences exist by sex. METHODS Data were collected from men and women (45 years and older) who completed the U.S. Behavioral Risk Factor Surveillance System Cognitive Decline Module (2015-2018), n = 216,838. We calculated population-attributable fractions for subjective cognitive decline, stratified by sex, of the following factors: limited education, deafness, social isolation, depression, smoking, physical inactivity, obesity, hypertension, and diabetes. Our models were adjusted for age, race, income, employment, marital and Veteran status, and accounted for communality among risk factors. RESULTS The final study sample included more women (53.7%) than men, but both had a similar prevalence of subjective cognitive decline (10.6% of women versus 11.2% of men). Women and men had nearly equivalent overall population-attributable fractions to explain subjective cognitive decline (39.7% for women versus 41.3% for men). The top three contributing risk factors were social isolation, depression, and hypertension, which explained three-quarters of the overall population-attributable fraction. CONCLUSIONS While we did not identify any differences in modifiable factors between men and women contributing to subjective cognitive decline, other factors including reproductive or endocrinological health history or biological factors that interact with sex to modify risk warrant further research.
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Affiliation(s)
- Karen C Schliep
- Division of Public Health, Department of Family and Preventive Medicine, University of Utah School of Medicine, 375 Chipeta Way, Suite A, Salt Lake City, UT, 84108, USA
| | - William A Barbeau
- Parkinson School of Health Sciences and Public Health, Loyola University Chicago, Maywood, Illinois, USA
| | - Kristine E Lynch
- Division of Epidemiology, Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA.,Department of Veterans Affairs, VA Informatics and Computing Infrastructure, Salt Lake City, Utah, USA
| | - Michelle K Sorweid
- Division of Gerontology, Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA
| | - Michael W Varner
- Division of Maternal Fetal Medicine, Department of Obstetrics and Gynecology, University of Utah, Salt Lake City, Utah, USA
| | - Norman L Foster
- Department of Neurology, University of Utah, Salt Lake City, Utah, USA
| | - Fares Qeadan
- Parkinson School of Health Sciences and Public Health, Loyola University Chicago, Maywood, Illinois, USA. .,Department of Public Health Sciences, Loyola University Chicago, Parkinson School of Health Sciences and Public Health, 2160 S 1st Ave, Maywood, IL, 60153, USA.
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25
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Hyun J, Hall CB, Katz MJ, Derby CA, Lipnicki DM, Crawford JD, Guaita A, Vaccaro R, Davin A, Kim KW, Han JW, Bae JB, Röhr S, Riedel-Heller S, Ganguli M, Jacobsen E, Hughes TF, Brodaty H, Kochan NA, Trollor J, Lobo A, Santabarbara J, Lopez-Anton R, Sachdev PS, Lipton RB. Education, Occupational Complexity, and Incident Dementia: A COSMIC Collaborative Cohort Study. J Alzheimers Dis 2022; 85:179-196. [PMID: 34776437 PMCID: PMC8748312 DOI: 10.3233/jad-210627] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
BACKGROUND Education and occupational complexity are main sources of mental engagement during early life and adulthood respectively, but research findings are not conclusive regarding protective effects of these factors against late-life dementia. OBJECTIVE This project aimed to examine the unique contributions of education and occupational complexity to incident dementia, and to assess the mediating effects of occupational complexity on the association between education and dementia across diverse cohorts. METHOD We used data from 10,195 participants (median baseline age = 74.1, range = 58∼103), representing 9 international datasets from 6 countries over 4 continents. Using a coordinated analysis approach, the accelerated failure time model was applied to each dataset, followed by meta-analysis. In addition, causal mediation analyses were performed. RESULT The meta-analytic results indicated that both education and occupational complexity were independently associated with increased dementia-free survival time, with 28%of the effect of education mediated by occupational complexity. There was evidence of threshold effects for education, with increased dementia-free survival time associated with 'high school completion' or 'above high school' compared to 'middle school completion or below'. CONCLUSION Using datasets from a wide range of geographical regions, we found that both early life education and adulthood occupational complexity were independently predictive of dementia. Education and occupational experiences occur during early life and adulthood respectively, and dementia prevention efforts could thus be made at different stages of the life course.
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Affiliation(s)
- Jinshil Hyun
- Saul R. Korey Department of Neurology, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Charles B. Hall
- Saul R. Korey Department of Neurology, Albert Einstein College of Medicine, Bronx, NY, USA
- Department of Epidemiology & Population Health, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Mindy J. Katz
- Saul R. Korey Department of Neurology, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Carol A. Derby
- Saul R. Korey Department of Neurology, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Darren M. Lipnicki
- Centre for Healthy Brain Ageing, University of New South Wales, Sydney, New South Wales, Australia
| | - John D. Crawford
- Centre for Healthy Brain Ageing, University of New South Wales, Sydney, New South Wales, Australia
| | | | | | | | - Ki Woong Kim
- Department of Neuropsychiatry, Seoul National University Bundang Hospital, Seongnam, South Korea
| | - Ji Won Han
- Department of Psychiatry, College of Medicine, Seoul National University, Seoul, South Korea
| | - Jong Bin Bae
- Department of Brain & Cognitive Sciences, Seoul National University, Seoul, South Korea
| | - Susanne Röhr
- Institute of Social Medicine, Occupational Health and Public Health (ISAP), University of Leipzig, Leipzig, Germany
- Global Brain Health Institute (GBHI), Trinity College Dublin, Dublin, Ireland
| | - Steffi Riedel-Heller
- Institute of Social Medicine, Occupational Health and Public Health (ISAP), University of Leipzig, Leipzig, Germany
| | | | | | | | - Henry Brodaty
- Centre for Healthy Brain Ageing, University of New South Wales, Sydney, New South Wales, Australia
- Dementia Collaborative Research Centre, University of New South Wales, Sydney, New South Wales, Australia
| | - Nicole A. Kochan
- Centre for Healthy Brain Ageing, University of New South Wales, Sydney, New South Wales, Australia
| | - Julian Trollor
- Centre for Healthy Brain Ageing, University of New South Wales, Sydney, New South Wales, Australia
- Department of Developmental Disability Neuropsychiatry, School of Psychiatry, University of New South Wales, Sydney, New South Wales, Australia
| | - Antonio Lobo
- Instituto de Investigación Sanitaria Aragón, Zaragoza, Spain
- Centro de Investigación Biomédica en Red de Salud Mental, Ministry of Science and Innovation, Spain
- Department of Medicine and Psychiatry, Universidad de Zaragoza, Zaragoza, Spain
| | - Javier Santabarbara
- Instituto de Investigación Sanitaria Aragón, Zaragoza, Spain
- Centro de Investigación Biomédica en Red de Salud Mental, Ministry of Science and Innovation, Spain
- Department of Preventive Medicine and Public Health, University of Zaragoza, Zaragoza, Spain
| | - Raul Lopez-Anton
- Instituto de Investigación Sanitaria Aragón, Zaragoza, Spain
- Centro de Investigación Biomédica en Red de Salud Mental, Ministry of Science and Innovation, Spain
- Department of Psychology and Sociology, Universidad de Zaragoza, Teruel, Spain
| | - Perminder S. Sachdev
- Centre for Healthy Brain Ageing, University of New South Wales, Sydney, New South Wales, Australia
- Dementia Collaborative Research Centre, University of New South Wales, Sydney, New South Wales, Australia
| | - Richard B. Lipton
- Saul R. Korey Department of Neurology, Albert Einstein College of Medicine, Bronx, NY, USA
- Department of Epidemiology & Population Health, Albert Einstein College of Medicine, Bronx, NY, USA
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Harrington K, Craven MP, Wilson ML, Landowska A. Using Patient and Public Involvement to Elicit Opinion on Cognitive Training Games and Assessment Technologies for Dementia (Preprint). JMIR Serious Games 2021; 10:e32489. [PMID: 35723912 PMCID: PMC9253969 DOI: 10.2196/32489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 12/22/2021] [Accepted: 02/17/2022] [Indexed: 11/28/2022] Open
Abstract
Background Cognitive training and assessment technologies offer the promise of dementia risk reduction and a more timely diagnosis of dementia, respectively. Cognitive training games may help reduce the lifetime risk of dementia by helping to build cognitive reserve, whereas cognitive assessment technologies offer the opportunity for a more convenient approach to early detection or screening. Objective This study aims to elicit perspectives of potential end users on factors related to the acceptability of cognitive training games and assessment technologies, including their opinions on the meaningfulness of measurement of cognition, barriers to and facilitators of adoption, motivations to use games, and interrelationships with existing health care infrastructure. Methods Four linked workshops were conducted with the same group, each focusing on a specific topic: meaningful improvement, learning and motivation, trust in digital diagnosis, and barriers to technology adoption. Participants in the workshops included local involvement team members acting as facilitators and those recruited via Join Dementia Research through a purposive selection and volunteer sampling method. Group activities were recorded, and transcripts were analyzed using thematic analysis with a combination of a priori and data-driven themes. Using a mixed methods approach, we investigated the relationships between the categories of the Capability, Opportunity, and Motivation–Behavior change model along with data-driven themes by measuring the φ coefficient between coded excerpts and ensuring the reliability of our coding scheme by using independent reviewers and assessing interrater reliability. Finally, we explored these themes and their relationships to address our research objectives. Results In addition to discussions around the capability, motivation, and opportunity categories, several important themes emerged during the workshops: family and friends, cognition and mood, work and hobbies, and technology. Group participants mentioned the importance of functional and objective measures of cognitive change, the social aspect of activities as a motivating factor, and the opportunities and potential shortcomings of digital health care provision. Our quantitative results indicated at least moderate agreement on all but one of the coding schemes and good independence of our coding categories. Positive and statistically significant φ coefficients were observed between several coding themes between categories, including a relatively strong positive φ coefficient between capability and cognition (0.468; P<.001). Conclusions The implications for researchers and technology developers include assessing how cognitive training and screening pathways would integrate into existing health care systems; however, further work needs to be undertaken to address barriers to adoption and the potential real-world impact of cognitive training and screening technologies. International Registered Report Identifier (IRRID) RR2-10.1007/978-3-030-49065-2_4
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Affiliation(s)
- Kyle Harrington
- NIHR MindTech MedTech Co-operative, Institute of Mental Health, Nottingham, United Kingdom
- School of Medicine, Faculty of Medicine and Health Sciences, University of Nottingham, Nottingham, United Kingdom
- NIHR Nottingham Biomedical Research Centre, University of Nottingham, Nottingham, United Kingdom
| | - Michael P Craven
- NIHR MindTech MedTech Co-operative, Institute of Mental Health, Nottingham, United Kingdom
- NIHR Nottingham Biomedical Research Centre, University of Nottingham, Nottingham, United Kingdom
- Human Factors Research Group, Faculty of Engineering, University of Nottingham, Nottingham, United Kingdom
| | - Max L Wilson
- NIHR Nottingham Biomedical Research Centre, University of Nottingham, Nottingham, United Kingdom
- Mixed Reality Lab, School of Computer Science, University of Nottingham, Nottingham, United Kingdom
| | - Aleksandra Landowska
- NIHR Nottingham Biomedical Research Centre, University of Nottingham, Nottingham, United Kingdom
- Mixed Reality Lab, School of Computer Science, University of Nottingham, Nottingham, United Kingdom
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Menczel Schrire Z, Phillips CL, Duffy SL, Marshall NS, Mowszowski L, La Monica HM, Gordon CJ, Chapman JL, Saini B, Lewis SJG, Naismith SL, Grunstein RR, Hoyos CM. Feasibility of 3-month melatonin supplementation for brain oxidative stress and sleep in mild cognitive impairment: protocol for a randomised, placebo-controlled study. BMJ Open 2021; 11:e041500. [PMID: 33568368 PMCID: PMC7878132 DOI: 10.1136/bmjopen-2020-041500] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Revised: 12/30/2020] [Accepted: 01/14/2021] [Indexed: 11/30/2022] Open
Abstract
INTRODUCTION Melatonin has multiple proposed therapeutic benefits including antioxidant properties, synchronisation of the circadian system and lowering of blood pressure. In this protocol, we outline a randomised controlled trial to assess the feasibility, acceptability and tolerability of higher dose (25 mg) melatonin to target brain oxidative stress and sleep disturbance in older adults with mild cognitive impairment (MCI). METHODS AND ANALYSIS The study design is a randomised double-blind, placebo-controlled, parallel group trial. Forty individuals with MCI will be recruited from the Healthy Brain Ageing Clinic, University of Sydney and from the community, and randomised to receive either 25 mg oral melatonin or placebo nightly for 12 weeks. The primary outcomes are feasibility of recruitment, acceptability of intervention and adherence to trial medication at 12 weeks. Secondary outcomes will include the effect of melatonin on brain oxidative stress as measured by magnetic resonance spectroscopy, blood pressure, blood biomarkers, mood, cognition and sleep. Outcomes will be collected at 6 and 12 weeks. The results of this feasibility trial will inform a future conclusive randomised controlled trial to specifically test the efficacy of melatonin on modifiable risk factors of dementia, as well as cognition and brain function. This will be the first trial to investigate the effect of melatonin in the population with MCI in this way, with the future aim of using this approach to reduce progression to dementia. ETHICS AND DISSEMINATION This protocol has been approved by the Sydney Local Health District Ethics Committee (X18-0077). This randomised controlled trial will be conducted in compliance with the protocol published in the registry, the International Conference for Harmonisation on Good Clinical Practice and all other applicable regulatory requirements. The findings of the trial will be disseminated via conferences, publications and media, as applicable. Participants will be informed of results of the study at the conclusion of the trial. Eligible authors will include investigators who are involved in the conception and design of the study, the conduct of the trial, the analysis of the results, and reporting and presentation of study findings. TRIAL REGISTRATION NUMBER Australian and New Zealand Clinical Trials Registry (ANZCTRN 12619000876190). PROTOCOL VERSION V.8 15 October 2020.
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Affiliation(s)
- Zoe Menczel Schrire
- Healthy Brain Ageing Program, The University of Sydney School of Psychology, Sydney, New South Wales, Australia
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- Brain & Mind Centre, The University of Sydney, Sydney, New South Wales, Australia
- CIRUS, Centre for Sleep and Chronobiology, The Woolcock Institute of Medical Research, Camperdown, New South Wales, Australia
| | - Craig L Phillips
- CIRUS, Centre for Sleep and Chronobiology, The Woolcock Institute of Medical Research, Camperdown, New South Wales, Australia
- Faculty of Medicine and Health, University of Sydney, Sydney, New South Wales, Australia
| | - Shantel L Duffy
- Healthy Brain Ageing Program, The University of Sydney School of Psychology, Sydney, New South Wales, Australia
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- Brain & Mind Centre, The University of Sydney, Sydney, New South Wales, Australia
- CIRUS, Centre for Sleep and Chronobiology, The Woolcock Institute of Medical Research, Camperdown, New South Wales, Australia
- Faculty of Medicine and Health, University of Sydney, Sydney, New South Wales, Australia
| | - Nathaniel S Marshall
- CIRUS, Centre for Sleep and Chronobiology, The Woolcock Institute of Medical Research, Camperdown, New South Wales, Australia
- Faculty of Medicine and Health, University of Sydney, Sydney, New South Wales, Australia
| | - Loren Mowszowski
- Healthy Brain Ageing Program, The University of Sydney School of Psychology, Sydney, New South Wales, Australia
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- Brain & Mind Centre, The University of Sydney, Sydney, New South Wales, Australia
| | - Haley M La Monica
- Healthy Brain Ageing Program, The University of Sydney School of Psychology, Sydney, New South Wales, Australia
- Brain & Mind Centre, The University of Sydney, Sydney, New South Wales, Australia
- Faculty of Medicine and Health, University of Sydney, Sydney, New South Wales, Australia
| | - Christopher J Gordon
- CIRUS, Centre for Sleep and Chronobiology, The Woolcock Institute of Medical Research, Camperdown, New South Wales, Australia
- Faculty of Medicine and Health, University of Sydney, Sydney, New South Wales, Australia
| | - Julia L Chapman
- Healthy Brain Ageing Program, The University of Sydney School of Psychology, Sydney, New South Wales, Australia
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- Brain & Mind Centre, The University of Sydney, Sydney, New South Wales, Australia
- CIRUS, Centre for Sleep and Chronobiology, The Woolcock Institute of Medical Research, Camperdown, New South Wales, Australia
| | - Bandana Saini
- CIRUS, Centre for Sleep and Chronobiology, The Woolcock Institute of Medical Research, Camperdown, New South Wales, Australia
- Faculty of Medicine and Health, University of Sydney, Sydney, New South Wales, Australia
| | - Simon J G Lewis
- Brain & Mind Centre, The University of Sydney, Sydney, New South Wales, Australia
- Faculty of Medicine and Health, University of Sydney, Sydney, New South Wales, Australia
| | - Sharon L Naismith
- Healthy Brain Ageing Program, The University of Sydney School of Psychology, Sydney, New South Wales, Australia
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- Brain & Mind Centre, The University of Sydney, Sydney, New South Wales, Australia
| | - Ronald R Grunstein
- CIRUS, Centre for Sleep and Chronobiology, The Woolcock Institute of Medical Research, Camperdown, New South Wales, Australia
- Faculty of Medicine and Health, University of Sydney, Sydney, New South Wales, Australia
- Royal Prince Alfred Hosptial, Sydney Local Health District, Sydney, New South Wales, Australia
| | - Camilla M Hoyos
- Healthy Brain Ageing Program, The University of Sydney School of Psychology, Sydney, New South Wales, Australia
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- Brain & Mind Centre, The University of Sydney, Sydney, New South Wales, Australia
- CIRUS, Centre for Sleep and Chronobiology, The Woolcock Institute of Medical Research, Camperdown, New South Wales, Australia
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