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Gao PY, Ma LZ, Wang XJ, Wu BS, Huang YM, Wang ZB, Fu Y, Ou YN, Feng JF, Cheng W, Tan L, Yu JT. Physical frailty, genetic predisposition, and incident dementia: a large prospective cohort study. Transl Psychiatry 2024; 14:212. [PMID: 38802408 PMCID: PMC11130190 DOI: 10.1038/s41398-024-02927-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Revised: 05/10/2024] [Accepted: 05/13/2024] [Indexed: 05/29/2024] Open
Abstract
Physical frailty and genetic factors are both risk factors for increased dementia; nevertheless, the joint effect remains unclear. This study aimed to investigated the long-term relationship between physical frailty, genetic risk, and dementia incidence. A total of 274,194 participants from the UK Biobank were included. We applied Cox proportional hazards regression models to estimate the association between physical frailty and genetic and dementia risks. Among the participants (146,574 females [53.45%]; mean age, 57.24 years), 3,353 (1.22%) new-onset dementia events were recorded. Compared to non-frailty, the hazard ratio (HR) for dementia incidence in prefrailty and frailty was 1.396 (95% confidence interval [CI], 1.294-1.506, P < 0.001) and 2.304 (95% CI, 2.030-2.616, P < 0.001), respectively. Compared to non-frailty and low polygenic risk score (PRS), the HR for dementia risk was 3.908 (95% CI, 3.051-5.006, P < 0.001) for frailty and high PRS. Furthermore, among the participants, slow walking speed (HR, 1.817; 95% CI, 1.640-2.014, P < 0.001), low physical activity (HR, 1.719; 95% CI, 1.545-1.912, P < 0.001), exhaustion (HR, 1.670; 95% CI, 1.502-1.856, P < 0.001), low grip strength (HR, 1.606; 95% CI, 1.479-1.744, P < 0.001), and weight loss (HR, 1.464; 95% CI, 1.328-1.615, P < 0.001) were independently associated with dementia risk compared to non-frailty. Particularly, precise modulation for different dementia genetic risk populations can also be identified due to differences in dementia risk resulting from the constitutive pattern of frailty in different genetic risk populations. In conclusion, both physical frailty and high genetic risk are significantly associated with higher dementia risk. Early intervention to modify frailty is beneficial for achieving primary and precise prevention of dementia, especially in those at high genetic risk.
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Affiliation(s)
- Pei-Yang Gao
- Department of Neurology, Qingdao Municipal Hospital, Qingdao University, Qingdao, China
| | - Ling-Zhi Ma
- Department of Neurology, Qingdao Municipal Hospital, Qingdao University, Qingdao, China
| | - Xue-Jie Wang
- Department of Neurology, Qingdao Municipal Hospital, Qingdao University, Qingdao, China
| | - Bang-Sheng Wu
- Department of Neurology and National Center for Neurological Disorders, Huashan Hospital, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Shanghai Medical College, Fudan University, Shanghai, China
| | - Yi-Ming Huang
- Department of Neurology, Qingdao Municipal Hospital, Qingdao University, Qingdao, China
| | - Zhi-Bo Wang
- Innovation Center for Neurological Disorders and Department of Neurology, Xuanwu Hospital, Capital Medical University, National Center for Neurological Disorders, Beijing, China
| | - Yan Fu
- Department of Neurology, Qingdao Municipal Hospital, Qingdao University, Qingdao, China
| | - Ya-Nan Ou
- Department of Neurology, Qingdao Municipal Hospital, Qingdao University, Qingdao, China
| | - Jian-Feng Feng
- Institute of Science and Technology for Brain-Inspired Intelligence, Fudan University, Shanghai, China
- Key Laboratory of Computational Neuroscience and Brain-Inspired Intelligence (Fudan University), Ministry of Education, Shanghai, China
- Fudan ISTBI-ZJNU Algorithm Centre for Brain-Inspired Intelligence, Zhejiang Normal University, Jinhua, China
- MOE Frontiers Center for Brain Science, Fudan University, Shanghai, China
- Zhangjiang Fudan International Innovation Center, Shanghai, China
| | - Wei Cheng
- Department of Neurology and National Center for Neurological Disorders, Huashan Hospital, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Shanghai Medical College, Fudan University, Shanghai, China
- Institute of Science and Technology for Brain-Inspired Intelligence, Fudan University, Shanghai, China
- Key Laboratory of Computational Neuroscience and Brain-Inspired Intelligence (Fudan University), Ministry of Education, Shanghai, China
- Fudan ISTBI-ZJNU Algorithm Centre for Brain-Inspired Intelligence, Zhejiang Normal University, Jinhua, China
| | - Lan Tan
- Department of Neurology, Qingdao Municipal Hospital, Qingdao University, Qingdao, China.
| | - Jin-Tai Yu
- Department of Neurology and National Center for Neurological Disorders, Huashan Hospital, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Shanghai Medical College, Fudan University, Shanghai, China.
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Rosenau C, Köhler S, Soons LM, Anstey KJ, Brayne C, Brodaty H, Engedal K, Farina FR, Ganguli M, Livingston G, Lyketsos CG, Mangialasche F, Middleton LE, Rikkert MGMO, Peters R, Sachdev PS, Scarmeas N, Salbæk G, van Boxtel MPJ, Deckers K. Umbrella review and Delphi study on modifiable factors for dementia risk reduction. Alzheimers Dement 2024; 20:2223-2239. [PMID: 38159267 PMCID: PMC10984497 DOI: 10.1002/alz.13577] [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: 11/09/2023] [Accepted: 11/13/2023] [Indexed: 01/03/2024]
Abstract
A 2013 systematic review and Delphi consensus study identified 12 modifiable risk and protective factors for dementia, which were subsequently merged into the "LIfestyle for BRAin health" (LIBRA) score. We systematically evaluated whether LIBRA requires revision based on new evidence. To identify modifiable risk and protective factors suitable for dementia risk reduction, we combined an umbrella review of systematic reviews and meta-analyses with a two-round Delphi consensus study. The review of 608 unique primary studies and opinions of 18 experts prioritized six modifiable factors: hearing impairment, social contact, sleep, life course inequalities, atrial fibrillation, and psychological stress. Based on expert ranking, hearing impairment, social contact, and sleep were considered the most suitable candidates for inclusion in updated dementia risk scores. As such, the current study shows that dementia risk scores need systematic updates based on emerging evidence. Future studies will validate the updated LIBRA score in different cohorts. HIGHLIGHTS: An umbrella review was combined with opinions of 18 dementia experts. Various candidate targets for dementia risk reduction were identified. Experts prioritized hearing impairment, social contact, and sleep. Re-assessment of dementia risk scores is encouraged. Future work should evaluate the predictive validity of updated risk scores.
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Affiliation(s)
- Colin Rosenau
- Alzheimer Centrum LimburgDepartment of Psychiatry and NeuropsychologySchool for Mental Health and Neuroscience (MHeNs)Maastricht UniversityMaastrichtthe Netherlands
| | - Sebastian Köhler
- Alzheimer Centrum LimburgDepartment of Psychiatry and NeuropsychologySchool for Mental Health and Neuroscience (MHeNs)Maastricht UniversityMaastrichtthe Netherlands
| | - Lion M. Soons
- Alzheimer Centrum LimburgDepartment of Psychiatry and NeuropsychologySchool for Mental Health and Neuroscience (MHeNs)Maastricht UniversityMaastrichtthe Netherlands
| | - Kaarin J. Anstey
- School of PsychologyUniversity of New South WalesKensingtonNew South WalesAustralia
- Neuroscience Research Australia (NeuRA)SydneyNew South WalesAustralia
- UNSW Ageing Futures InstituteKensingtonNew South WalesAustralia
| | - Carol Brayne
- Cambridge Public HealthUniversity of CambridgeCambridgeUK
| | - Henry Brodaty
- Centre for Healthy Brain Ageing (CHeBA)Discipline of Psychiatry and Mental HealthSchool of Clinical MedicineUniversity of New South WalesSydneyNew South WalesAustralia
| | - Knut Engedal
- Norwegian National Centre for Ageing and HealthVestfold Hospital TrustTønsbergNorway
| | - Francesca R. Farina
- Feinberg School of MedicineDepartment of Medical Social SciencesNorthwestern UniversityChicagoIllinoisUSA
| | - Mary Ganguli
- Departments of PsychiatryNeurologyand EpidemiologySchool of Medicine and School of Public HealthUniversity of PittsburghPittsburghPennsylvaniaUSA
| | | | - Constantine G. Lyketsos
- Richman Family Precision Medicine Center of Excellence in Alzheimer's DiseaseJohns Hopkins BayviewJohns Hopkins MedicineBaltimoreMarylandUSA
| | - Francesca Mangialasche
- Division of Clinical GeriatricsDepartment of NeurobiologyCare Sciences and SocietyCenter for Alzheimer ResearchKarolinska InstitutetStockholmSweden
- Theme Inflammation and AgingMedical Unit AgingKarolinska University HospitalStockholmSweden
| | - Laura E. Middleton
- Department of Kinesiology and Health SciencesUniversity of WaterlooWaterlooOntarioCanada
- Schlegel‐UW Research Institute for AgingWaterlooOntarioCanada
| | - Marcel G. M. Olde Rikkert
- Department of Geriatric MedicineRadboud University Medical CenterNijmegenthe Netherlands
- Radboudumc Alzheimer CenterDonders Center of Medical NeurosciencesNijmegenthe Netherlands
| | - Ruth Peters
- UNSW Ageing Futures InstituteKensingtonNew South WalesAustralia
- The George Institute for Global HealthNewtownNew South WalesAustralia
- School of Biomedical SciencesUniversity of New South WalesKensingtonNew South WalesAustralia
| | - Perminder S. Sachdev
- Centre for Healthy Brain Ageing (CHeBA)Discipline of Psychiatry and Mental HealthSchool of Clinical MedicineUniversity of New South WalesSydneyNew South WalesAustralia
| | - Nikolaos Scarmeas
- 1st Department of NeurologyAiginition HospitalNational and Kapodistrian University of Athens Medical SchoolAthensGreece
- Department of NeurologyColumbia UniversityNew YorkNew YorkUSA
| | - Geir Salbæk
- Norwegian National Centre for Ageing and HealthVestfold Hospital TrustTønsbergNorway
- Department of Geriatric MedicineOslo University HospitalOsloNorway
- Institute of Clinical MedicineUniversity of OsloOsloNorway
| | - Martin P. J. van Boxtel
- Alzheimer Centrum LimburgDepartment of Psychiatry and NeuropsychologySchool for Mental Health and Neuroscience (MHeNs)Maastricht UniversityMaastrichtthe Netherlands
| | - Kay Deckers
- Alzheimer Centrum LimburgDepartment of Psychiatry and NeuropsychologySchool for Mental Health and Neuroscience (MHeNs)Maastricht UniversityMaastrichtthe Netherlands
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Alb'ool B, Abu Khait A. The presence and severity of neuropsychiatric symptoms and their association with quality of life among patients with dementia. Cogn Neuropsychiatry 2023; 28:307-325. [PMID: 37665567 DOI: 10.1080/13546805.2023.2255342] [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: 11/14/2022] [Accepted: 07/10/2023] [Indexed: 09/05/2023]
Abstract
BACKGROUND Neuropsychiatric symptoms are common manifestations of dementia. The presence and severity of these symptoms differ depending on different personal and contextual factors. PURPOSE This study aimed to investigate the presence and predictors of neuropsychiatric symptoms and the association between the severity of these symptoms and the quality of life in a sample of patients with dementia in Jordan. METHODS In this cross-sectional study, 112 patients with dementia residing in Jordanian nursing homes were recruited using the consecutive sampling method. RESULTS The mean severity of neuropsychiatric symptoms was 9.58. The most prevalent neuropsychiatric symptoms among patients were depression (61.6%), followed by irritability (55.4%), and a feeling of euphoria (54.5%). The regression analysis results indicated that gender, marital status, and dementia severity significantly predicted the neuropsychiatric symptoms severity score and explained 17.70% of the variance. A significant negative correlation between the severity of neuropsychiatric symptoms and quality of life was found. CONCLUSION The study's results indicate that our sample reported mild neuropsychiatric symptoms. These symptoms' high prevalence and persistence negatively impact patients' quality of life. The study's results can help mental health nurses determine the factors impacting effective treatment strategies to combat these symptoms. Future longitudinal studies are warranted to help explain the importance of early diagnosis and management of these symptoms in preventing dementia progression.
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Affiliation(s)
- Banan Alb'ool
- Department of Health Care, Vocational Training Corporation, Irbid, Jordan
| | - Abdallah Abu Khait
- Department of Community and Mental Health Nursing, Faculty of Nursing, The Hashemite University, Zarqa, Jordan
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Sulkava S, Haukka J, Sulkava R, Laatikainen T, Paunio T. Association Between Psychological Distress and Incident Dementia in a Population-Based Cohort in Finland. JAMA Netw Open 2022; 5:e2247115. [PMID: 36520436 PMCID: PMC9856411 DOI: 10.1001/jamanetworkopen.2022.47115] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
IMPORTANCE Symptoms of psychological distress have shown association with subsequent dementia, but the nature of association remains unclear. OBJECTIVE To examine the association of psychological distress with etiological risk of dementia and incidence of dementia in presence of competing risk of death. DESIGN, SETTING, AND PARTICIPANTS This cohort study consisted of population-based cross-sectional National FINRISK Study surveys collected in 1972, 1977, 1982, 1987, 1992, 1997, 2002, and 2007 in Finland with register-based follow-up; and the cohort was linked to Finnish Health Register data for dementia and mortality for each participant until December 31, 2017. Participants included individuals without dementia who had complete exposure data. Data were analyzed from May 2019 to April 2022. EXPOSURES Self-reported symptoms of psychological distress: stress (more than other people), depressive mood, exhaustion, and nervousness (often, sometimes, never). MAIN OUTCOMES AND MEASURES Incident all-cause dementia, ascertained through linkage to national health registers. Poisson cause-specific hazard model (emphasizing etiological risk) and Fine-Gray subdistribution hazard model (emphasizing effect on incidence) considering dementia and death without dementia as competing risks. Covariates of age, sex, baseline year, follow-up time, educational level, body mass index, smoking, diabetes, systolic blood pressure, cholesterol, and physical activity. Sensitivity analysis was performed to reduce reverse causation bias by excluding individuals with follow-up less than 10 years. RESULTS Among 67 688 participants (34 968 [51.7%] women; age range, 25 to 74 years; mean [SD] age, 45.4 years), 7935 received a diagnosis of dementia over a mean follow-up of 25.4 years (range, 10 to 45 years). Psychological distress was significantly associated with all-cause dementia in a multivariable Poisson model, with incidence rate ratios from 1.17 (95% CI, 1.08-1.26) for exhaustion to 1.24 (95% CI, 1.11-1.38) for stress, and remained significant in sensitivity analyses. A Fine-Gray model showed significant associations (with hazard ratios from 1.08 [95% CI, 1.01-1.17] for exhaustion to 1.12 [95% CI, 1.00-1.25] for stress) for symptoms other than depressive mood (hazard ratio, 1.08 [95% CI, 0.98-1.20]). All the symptoms showed significant associations with competing risk of death in both models. CONCLUSIONS AND RELEVANCE In this cohort study, psychological distress symptoms were significantly associated with increased risk of all-cause dementia in the model emphasizing etiological risk. Associations with real incidence of dementia were diminished by the competing risk of death.
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Affiliation(s)
- Sonja Sulkava
- Department of Public Health and Welfare, Finnish Institute for Health and Welfare, Helsinki, Finland
- Department of Psychiatry and SleepWell Research Programme, Faculty of Medicine, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
- Department of Clinical Genetics, Helsinki University Hospital, Helsinki, Finland
| | - Jari Haukka
- Department of Public Health, University of Helsinki, Helsinki, Finland
| | - Raimo Sulkava
- Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland
- Amia Memory Clinics, Helsinki, Finland
| | - Tiina Laatikainen
- Department of Public Health and Welfare, Finnish Institute for Health and Welfare, Helsinki, Finland
- Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland
- Joint Municipal Authority for North Karelia Social and Health Services (Siun Sote), Joensuu, Finland
| | - Tiina Paunio
- Department of Public Health and Welfare, Finnish Institute for Health and Welfare, Helsinki, Finland
- Department of Psychiatry and SleepWell Research Programme, Faculty of Medicine, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
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5
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Bai A, Xu W, Lin Z. Prevalence and Correlates of Motoric Cognitive Risk Syndrome in Chinese Community-Dwelling Older Adults. FRONTIERS IN AGING 2022; 3:895138. [PMID: 35821814 PMCID: PMC9261413 DOI: 10.3389/fragi.2022.895138] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/13/2022] [Accepted: 06/08/2022] [Indexed: 11/13/2022]
Abstract
Background: Motoric cognitive risk (MCR) syndrome is considered to be a pre-dementia syndrome. Although an increasing number of studies have begun to focus on this syndrome, few investigations have been launched in China. This study was performed to examine the prevalence and correlates of MCR in China.Methods: We included 5,725 adults aged over 60 years from China Health and Retirement Longitudinal Study (CHARLS). MCR was defined as the presence of subjective cognitive complaints and a gait speed ≤20th percentile of the weighted population distribution adjusted for sex and height. The associations among selected modifiable associated factors and clinical measures with MCR were examined using multivariate logistic regression analysis. Results: Of the participants, 414 met the criteria for MCR with an overall prevalence 7.29% (95% CI: 6.62–7.96%). MCR was found to be more prevalent among women than men (9.73 vs 4.85%), and more prevalent among participants ≥75 years than those <75 years (7.85 vs 5.23%). After multivariable adjustment, lower or upper extremity functional limitations, activities of daily living (ADL) disabilities, weak grip strength, exhaustion, and history of hypertension were found to be significantly associated with MCR. The multivariate analysis also showed higher levels of cystatin C and C-reactive protein were associated with increased odds for MCR. Conclusions: The present study showed that MCR syndrome is highly prevalent among Chinese community-dwelling older adults, and revealed several factors that were correlated with MCR. Longitudinal studies are warranted to further explore the modifiable risk factors of MCR.
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Affiliation(s)
- Anying Bai
- Department of Epidemiology and Biostatistics, School of Population Medicine and Public Health, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Weihao Xu
- Department of Cardiology, Guangdong Provincial Cardiovascular Institute, Guangdong Provincial People’s Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
- Department of Geriatrics, Guangdong Provincial Geriatrics Institute, Guangdong Provincial People’s Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Zhanyi Lin
- Department of Cardiology, Guangdong Provincial Cardiovascular Institute, Guangdong Provincial People’s Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
- Department of Geriatrics, Guangdong Provincial Geriatrics Institute, Guangdong Provincial People’s Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
- *Correspondence: Zhanyi Lin,
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Fieres J, Fischer M, Sauter C, Moreno-Villanueva M, Bürkle A, Wirtz PH. The burden of overweight: Higher body mass index, but not vital exhaustion, is associated with higher DNA damage and lower DNA repair capacity. DNA Repair (Amst) 2022; 114:103323. [DOI: 10.1016/j.dnarep.2022.103323] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 02/01/2022] [Accepted: 03/17/2022] [Indexed: 12/12/2022]
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Bougea A, Anagnostouli M, Angelopoulou E, Spanou I, Chrousos G. Psychosocial and Trauma-Related Stress and Risk of Dementia: A Meta-Analytic Systematic Review of Longitudinal Studies. J Geriatr Psychiatry Neurol 2022; 35:24-37. [PMID: 33205677 DOI: 10.1177/0891988720973759] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Stress has deleterious effects on brain health and yet, the prognostic value of psychosocial stress regarding the most common types of dementias, including Alzheimer disease, is still unclear. The primary aim of this systematic review was to explore the association between psychosocial stress and late onset dementia. We classified 24articles from Medline, PsycINFO, CINAHL, and Web of Science, as pertaining toxic categories of psychosocial and trauma-related stress (low socio-economic status [SES] related inequalities, marital status, posttraumatic stress disorder, work stress, "vital exhaustion" [VE], and, combined stressors). Using the Quality of Prognosis Studies in Systematic Reviews tool, we judged the quality of evidence to be low. This systematic review provided some non-robust, yet suggestive evidence that the above psychosocial types of stress are associated with increased risk of dementia in later life. Future robust, longitudinal studies with repeated validated measures of psychosocial stress and dementiaare required to strengthen or refute these findings.
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Affiliation(s)
- Anastasia Bougea
- Memory & Movement Disorders Clinic, 1st Department of Neurology, 69078Aeginition Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Maria Anagnostouli
- Memory & Movement Disorders Clinic, 1st Department of Neurology, 69078Aeginition Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece
- Demyelinating Diseases Clinic, 1st Department of Neurology, Medical School, National and Kapodistrian University of Athens, Aeginition Hospital, Athens, Greece
| | - Efthalia Angelopoulou
- Memory & Movement Disorders Clinic, 1st Department of Neurology, 69078Aeginition Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Ioanna Spanou
- Memory & Movement Disorders Clinic, 1st Department of Neurology, 69078Aeginition Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - George Chrousos
- University Research Institute of Maternal and Child Health and Precision Medicine, and UNESCO Chair on Adolescent Health Care, National and Kapodistrian University of Athens, Medical School, Athens, Greece
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8
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Islamoska S, Hansen ÅM, Ishtiak-Ahmed K, Garde AH, Andersen PK, Garde E, Taudorf L, Waldemar G, Nabe-Nielsen K. Stress diagnoses in midlife and risk of dementia: a register-based follow-up study. Aging Ment Health 2021; 25:1151-1160. [PMID: 32233797 DOI: 10.1080/13607863.2020.1742656] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
OBJECTIVES Previous studies indicated that stress diagnoses increase the risk of dementia. However, previous results may be biased by confounding, reverse causation and misclassification. Therefore, the main aim of this study was to investigate the association between clinically diagnosed stress in midlife and later dementia risk, while addressing limitations of previous studies. METHODS The study population was selected from all individuals in Denmark born 1935-1956. Individuals diagnosed with stress in midlife (aged 37-58 years) were matched (1:5) with individuals without stress diagnoses based on sex and birthdate (N = 103,484). Data were retrieved from national registers. Cox regression models were adjusted for socio-demographic factors and different morbidities. RESULTS We found a 2.20 (95% CI: 1.93-2.50) times higher rate of dementia among individuals with any stress diagnosis registered in midlife compared with no stress diagnosis. Hazard rate ratios of dementia were 1.73 (95% CI: 1.13-2.65) among individuals with acute stress reactions, 2.37 (95% CI: 2.05-2.74) among individuals with adjustment disorders, and 2.20 (95% CI: 1.73-2.80) among individuals with unspecified stress reactions. Individuals with PTSD and other stress reactions had non-significantly elevated rates of dementia. Adjustment for confounding only slightly attenuated the association, and reverse causation did not appear to bias the results substantially. CONCLUSION Our results support the hypothesis that severe stress in midlife is an important risk factor for dementia. This finding emphasizes the importance of identifying and treating severe stress in midlife to reduce potential detrimental consequences for brain health in later life.
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Affiliation(s)
- Sabrina Islamoska
- Department of Public Health, University of Copenhagen, Copenhagen, Denmark
| | - Åse Marie Hansen
- Department of Public Health, University of Copenhagen, Copenhagen, Denmark.,The National Research Center for the Working Environment, Copenhagen, Denmark
| | - Kazi Ishtiak-Ahmed
- Department of Public Health, University of Copenhagen, Copenhagen, Denmark.,Department of Affective Disorders, Aarhus University Hospital, Aarhus, Denmark
| | - Anne Helene Garde
- Department of Public Health, University of Copenhagen, Copenhagen, Denmark.,The National Research Center for the Working Environment, Copenhagen, Denmark
| | - Per Kragh Andersen
- Department of Public Health, University of Copenhagen, Copenhagen, Denmark
| | - Ellen Garde
- Department of Public Health, University of Copenhagen, Copenhagen, Denmark
| | - Lærke Taudorf
- Danish Dementia Research Centre, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Gunhild Waldemar
- Danish Dementia Research Centre, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
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9
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Knoop V, Cloots B, Costenoble A, Debain A, Vella Azzopardi R, Vermeiren S, Jansen B, Scafoglieri A, Bautmans I. Fatigue and the prediction of negative health outcomes: A systematic review with meta-analysis. Ageing Res Rev 2021; 67:101261. [PMID: 33548508 DOI: 10.1016/j.arr.2021.101261] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 12/23/2020] [Accepted: 01/24/2021] [Indexed: 12/22/2022]
Abstract
INTRODUCTION Fatigue is a common complaint among older adults. Evidence grows that fatigue is linked to several negative health outcomes. A general overview of fatigue and its relationship with negative health outcomes still lacks in the existing literature. This brings complications for healthcare professionals and researchers to identify fatigue-related health risks. Therefore, this study gives an overview of the prospective predictive value of the main negative health outcomes for fatigue in community-dwelling older adults. METHODS PubMed, Web of Knowledge and PsycINFO were systematically screened for prospective studies regarding the relationship between fatigue and negative health outcomes resulting in 4595 articles (last search 5th March 2020). Meta-analyses were conducted in RevMan using Odds ratios (ORs), Hazard ratios (HRs) and relative risk ratios (RR) that were extracted from the included studies. Subgroup-analyses were performed based on (1) gender (male/female), (2) length of follow-up and (3) fatigue level (low, medium and high). RESULTS In total, thirty articles were included for this systematic review and meta-analysis encompassing 152 711 participants (age range 40-98 years), providing information on the relationship between fatigue and health outcomes. The results showed that fatigue is related to an increased risk for the occurrence of all studied health outcomes (range OR 1.299-3.094; HR/RR 1.038-1.471); for example, mortality OR 2.14 [1.74-2.63]; HR/RR 1.44 [1.28-1.62]), the development of disabilities in basic activities of daily living (OR 3.22 [2.05-5.38]), or the occurrence of physical decline (OR 1.42 [1.29-1.57]). CONCLUSION Overall fatigue increases the risk for developing negative health outcomes. The analyses presented in this study show that fatigue related physical decline occurs earlier than hospitalization, diseases and mortality, suggesting the importance of early interventions.
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Affiliation(s)
- V Knoop
- Gerontology Department, Vrije Universiteit Brussel (VUB), Laarbeeklaan 103, B-1090, Brussels, Belgium; Frailty in Ageing (FRIA) Research Department, Vrije Universiteit Brussel (VUB), Laarbeeklaan 103, B-1090, Brussels, Belgium
| | - B Cloots
- Gerontology Department, Vrije Universiteit Brussel (VUB), Laarbeeklaan 103, B-1090, Brussels, Belgium; Frailty in Ageing (FRIA) Research Department, Vrije Universiteit Brussel (VUB), Laarbeeklaan 103, B-1090, Brussels, Belgium
| | - A Costenoble
- Gerontology Department, Vrije Universiteit Brussel (VUB), Laarbeeklaan 103, B-1090, Brussels, Belgium; Frailty in Ageing (FRIA) Research Department, Vrije Universiteit Brussel (VUB), Laarbeeklaan 103, B-1090, Brussels, Belgium
| | - A Debain
- Gerontology Department, Vrije Universiteit Brussel (VUB), Laarbeeklaan 103, B-1090, Brussels, Belgium; Frailty in Ageing (FRIA) Research Department, Vrije Universiteit Brussel (VUB), Laarbeeklaan 103, B-1090, Brussels, Belgium; Department of Geriatrics, Universitair Ziekenhuis Brussel (UZ Brussel), Laarbeeklaan 101, B-1090, Brussels, Belgium
| | - R Vella Azzopardi
- Gerontology Department, Vrije Universiteit Brussel (VUB), Laarbeeklaan 103, B-1090, Brussels, Belgium; Frailty in Ageing (FRIA) Research Department, Vrije Universiteit Brussel (VUB), Laarbeeklaan 103, B-1090, Brussels, Belgium; Department of Geriatrics, Universitair Ziekenhuis Brussel (UZ Brussel), Laarbeeklaan 101, B-1090, Brussels, Belgium
| | - S Vermeiren
- Gerontology Department, Vrije Universiteit Brussel (VUB), Laarbeeklaan 103, B-1090, Brussels, Belgium; Frailty in Ageing (FRIA) Research Department, Vrije Universiteit Brussel (VUB), Laarbeeklaan 103, B-1090, Brussels, Belgium
| | - B Jansen
- Department of Electronics and Informatics ETRO, Vrije Universiteit Brussel (VUB), Elsene, Belgium; Imec, Leuven, Belgium
| | - A Scafoglieri
- Frailty in Ageing (FRIA) Research Department, Vrije Universiteit Brussel (VUB), Laarbeeklaan 103, B-1090, Brussels, Belgium; Supporting Clinical Science Department and Research Department of Experimental Anatomy (EXAN), Vrije Universiteit Brussel (VUB), Brussels, Belgium
| | - I Bautmans
- Gerontology Department, Vrije Universiteit Brussel (VUB), Laarbeeklaan 103, B-1090, Brussels, Belgium; Frailty in Ageing (FRIA) Research Department, Vrije Universiteit Brussel (VUB), Laarbeeklaan 103, B-1090, Brussels, Belgium; Department of Geriatrics, Universitair Ziekenhuis Brussel (UZ Brussel), Laarbeeklaan 101, B-1090, Brussels, Belgium.
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10
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Kofahi R, Aljezawi M, Abdalrahim A, Al Qadire M, Obiedat D, Aqaileh S. Annual Period Prevalence and Risk Factors of Dementia Among Older Jordanian Hospitalized Patients. Int J Gen Med 2021; 14:641-647. [PMID: 33658836 PMCID: PMC7920585 DOI: 10.2147/ijgm.s299353] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Accepted: 02/05/2021] [Indexed: 12/13/2022] Open
Abstract
Background The number of people living with dementia is forecasted to increase rapidly, particularly in developing and underdeveloped countries. No epidemiological studies of dementia have been reported in Jordan; therefore, the number of people living with dementia and the risk factors are unknown. Objective Measure the annual period prevalence of dementia, along with its risk factors in Jordanian hospitalized patients over the age of 50 years. Methods The prevalence of dementia was measured using a prospective survey design for over one year. Risk factors were explored using a case-control match design. Results The total number of participants in the overall survey was 31,411, and the number of participants included as cases with dementia was 406, the number of matched controls free of dementia was 416. The general annual period prevalence of dementia for people older than 50 years was 1.29%, comprising 406 patients. Multivariate analysis revealed that older age, male gender, family history of dementia, and illiteracy were significant risk factors for dementia. Conclusion The prevalence of dementia in Jordan is lower than the global prevalence due to the relatively younger Jordanian population. Results from this study can provide baseline information for policymakers for significant health planning to meet the needs of such a group of patients.
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Affiliation(s)
- Raid Kofahi
- Jordan University of Science and Technology, Faculty of Medicine, Neuroscience Department, Irbid, Jordan
| | | | | | | | - Deema Obiedat
- Jordan University of Science and Technology, Faculty of Medicine, Neuroscience Department, Irbid, Jordan
| | - Suha Aqaileh
- Jordan University of Science and Technology, Faculty of Medicine, Neuroscience Department, Irbid, Jordan
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11
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Alexopoulos P, Papanastasiou AD, Εconomou P, Beis P, Niforas M, Dassios TG, Kormpaki A, Zarkadis IK, Reichel M, Kornhuber J, Perneczky R, Gourzis P. Associations between APOE-, COMT Val108/158Met- and BDNF Val66Met polymorphisms and variations in depressive and anxiety symptoms, sense of coherence and vital exhaustion in the real-life setting of mandatory basic military training. J Neural Transm (Vienna) 2021; 128:105-114. [PMID: 33394176 DOI: 10.1007/s00702-020-02280-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Accepted: 11/14/2020] [Indexed: 01/21/2023]
Abstract
Apolipoprotein E (APOE) ε, catechol-O-methytranferase (COMT) Val108/158Met and brain-derived neurotrophic factor (BDNF) Val66Met single nucleotide polymorphisms (SNPs) were shown to affect stress perception and response. The present study explored possible associations between these SNPs and changes in subclinical anxiety- and depressive symptoms, sense of coherence (SOC) and vital exhaustion (VE) during compulsory basic military training. The study encompassed 179 conscripts of a training base in Greece. The neuropsychiatric assessment was based on the Beck Depression Inventory, the State-Trait Anxiety Inventory, the Antonovsky SOC scale and the Maastricht Questionnaire. It was conducted at three time points of the 19-day basic military training: on day one (baseline), day six (follow-up I) and day 13 (follow-up II). Statistical analyses included Mann-Whitney test, Chi-square test and cross-sectional time series regression models based on the Skillings-Mack statistic. APOE ε4 non-carriers encountered significant changes in anxiety- and depressive symptoms and SOC (in all cases P < 0.001) over the observation period, whilst ε4 carriers did not. The changes in anxiety, depressive symptoms and SOC attained statistical significance in both BDNF Met66 carriers (in all cases P < 0.001) and non-carriers (P = 0.036; < 0.001; < 0.001, respectively) as well as in COMT Met108/158 carriers (P = 0.004; < 0.001; < 0.001, respectively) and non-carriers (P = 0.02; 0.01; 0.021, respectively. Changes over time in VE were not significant (P > 0.05). The observed resistance of APOE ε4 carriers vs non-carriers to changes in anxiety- and depressive symptoms and SOC when exposed to a stressful environment may point to superior coping capacities of healthy young men carrying the ε4 allele.
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Affiliation(s)
- Panagiotis Alexopoulos
- Department of Psychiatry, Faculty of Medicine, School of Health Sciences, University of Patras, University Hospital of Patras, 26504, Rion Patras, Greece.
- Department of Psychiatry and Psychotherapy, Faculty of Medicine, Technical University of Munich, Klinikum Rechts Der Isar, Ismaninger Strasse 22, 81675, Munich, Germany.
| | - Anastasios D Papanastasiou
- Deparment of Biomedical Sciences, University of West Attica, Ag. Spyridonos Street, 12243, Egaleo, Greece
| | - Polychronis Εconomou
- Department of Civil Engineering (Statistics), School of Engineering, University of Patras, 26504, Rion Patras, Greece
| | - Pavlos Beis
- Department of Psychiatry, Faculty of Medicine, School of Health Sciences, University of Patras, University Hospital of Patras, 26504, Rion Patras, Greece
| | - Michail Niforas
- Health Unit, Training Center of Technical Corps of the Hellenic Army, Maragkopoulou Str. 2, 26331, Patras, Greece
- Department of Orthopaedic and Accident Surgery, Center for Foot and Endoprothetic Joint Surgery, Malteser Clinics Rhein-Ruhr Duisburg, St. Johannesstift, Johannisstr. 21, 47198, Duisburg-Homberg, Germany
| | - Theodore G Dassios
- Health Unit, Training Center of Technical Corps of the Hellenic Army, Maragkopoulou Str. 2, 26331, Patras, Greece
- Department of Women and Children's Health, School of Life Course Sciences, Faculty of Life Sciences and Medicine, King's College London, St Thomas' Hospital, Westminster Bridge Road, London, SE1 7EH, UK
| | - Aggeliki Kormpaki
- Health Unit, Training Center of Technical Corps of the Hellenic Army, Maragkopoulou Str. 2, 26331, Patras, Greece
| | - Ioannis K Zarkadis
- Laboratory of General Biology, Faculty of Medicine, School of Health Sciences, University of Patras, 26504, Rion Patras, Greece
| | - Martin Reichel
- Department of Psychiatry and Psychotherapy, Friedrich-Alexander-University of Erlangen-Nuremberg, Schwabachanlage 6, 91054, Erlangen, Germany
- Department of Nephrology and Medical Intensive Care, Charité-Universitätsmedizin Berlin, Charitéplatz 1, 10117, Berlin, Germany
| | - Johannes Kornhuber
- Department of Psychiatry and Psychotherapy, Friedrich-Alexander-University of Erlangen-Nuremberg, Schwabachanlage 6, 91054, Erlangen, Germany
| | - Robert Perneczky
- Department of Psychiatry and Psychotherapy, University Hospital, LMU Munich Nussbaumstraße 7, 80336, Munich, Germany
- Ageing Epidemiology (AGE) Research Unit, Faculty of Medicine, School of Public Health, The Imperial College of Science, Technology and Medicine, London, SW7 2AZ, UK
- Munich Cluster for Systems Neurology (SyNergy), Feodor-Lynen-Str. 17, 81377, Munich, Germany
- German Center for Neurodegenerative Diseases (DZNE) Munich, Feodor-Lynen-Strasse 17, 81377, Munich, Germany
| | - Philippos Gourzis
- Department of Psychiatry, Faculty of Medicine, School of Health Sciences, University of Patras, University Hospital of Patras, 26504, Rion Patras, Greece
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12
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The association between sociodemographic characteristics and dementia in patients with atrial fibrillation. Aging Clin Exp Res 2020; 32:2319-2327. [PMID: 31927710 PMCID: PMC7591421 DOI: 10.1007/s40520-019-01449-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Accepted: 12/11/2019] [Indexed: 01/02/2023]
Abstract
Objectives Association between socio-demographic factors and dementia risk is studied in general but not for atrial fibrillation (AF) patients. Methods We studied AF patients ≥ 45 years in Sweden 1998–2012 (n = 537,513) using the Total Population Register for socio-demographic factors, the Swedish Cause of Death Register, and the National Patient Register (NPR) for incident dementia. Cox regression with hazard ratios (HR) and 95% confidence intervals (CI) was used for the association between exposure and outcome, adjusting for age and comorbidities. Results Totally 30,332 patients (5.6%) were diagnosed with dementia during the follow-up (mean 5.4 years). Of these, 14,097 were men (4.9%) and 16,235 were women (6.5%). Lower educational levels (reference: highest level) were associated with increased dementia, HRs (95% CI) for basic school for men 1.23 (1.18–1.29) and women 1.36 (1.30–1.42), and middle-level school for men 1.17 (1.11–1.22) and women 1.28 (1.22–1.34). Divorced men and women (reference: married) showed increased risk of dementia, HR 1.07 (1.01–1.13) and 1.12 (1.06–1.18), respectively, while widowed men showed lower risk, HR 0.84 (0.80–0.88). High deprivation neighborhood socio-economic status (NSES; reference: medium level) was associated with increased dementia in men, HR 1.11 (1.05–1.17), and low deprivation neighborhood socio-economic status (NSES) with increased dementia in men and women, HR 1.12 (1.06–1.18) and 1.18 (1.12–1.24), respectively. Conclusions Some results were expected, i.e. association between lower educational level and dementia. The higher risk of dementia in low deprivation NSES-areas could be due to a higher awareness about dementia, and subsequent earlier diagnosis and treatment of dementia. Electronic supplementary material The online version of this article (10.1007/s40520-019-01449-3) contains supplementary material, which is available to authorized users.
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13
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Nabe-Nielsen K, Rod NH, Hansen ÅM, Prescott E, Grynderup MB, Islamoska S, Ishtiak-Ahmed K, Garde AH, Gyntelberg F, Mortensen EL, Phung TKT, Waldemar G, Westendorp RGJ. Perceived stress and dementia: Results from the Copenhagen city heart study. Aging Ment Health 2020; 24:1828-1836. [PMID: 31184203 DOI: 10.1080/13607863.2019.1625304] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Objectives: We investigated if perceived stress in midlife increased the risk of dementia. Furthermore, we explored differences between subgroups related to sex, age and employment status when reporting stress.Methods: In this longitudinal study, we used information on perceived stress from 10,814 participants (mean age 56.7 years). Participants were followed through Danish national registers for development of dementia. Participants were considered at risk of dementia from the date they turned 60 years. Perceived stress was assessed as a combination of self-reported intensity and frequency of stress, and categorized into low (score 0-1), medium (score 2-4), and high stress (score 5-6). We used Poisson regression to estimate incidence rate ratios (IRR) and their 95% confidence intervals (CI) and adjusted for sociodemographic factors and psychiatric morbidity at baseline (main model) as well as cardio/cerebrovascular diseases and health behaviors at baseline (additional model).Results: The mean follow-up time was 13.8 years, and 1,519 participants were registered with dementia. Dementia risk was higher in participants reporting medium stress (IRR = 1.11, 95% CI: 0.99-1.24) and high stress (IRR = 1.36, 95% CI: 1.13-1.65). Adjustment for cardio/cerebrovascular diseases and health behaviors did not alter the results. We did not find strong support for differences between subgroups, although the association between stress and dementia was stronger for those who were employed at the time of reporting high stress.Conclusion: Our results provide empirical support for an effect of perceived stress on the risk of dementia in old age.
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Affiliation(s)
| | - Naja Hulvej Rod
- Department of Public Health, University of Copenhagen, Copenhagen, Denmark
| | - Åse Marie Hansen
- Department of Public Health, University of Copenhagen, Copenhagen, Denmark.,The National Research Centre for the Working Environment, Copenhagen, Denmark
| | - Eva Prescott
- Department of Cardiology, Bispebjerg Hospital, Copenhagen, Denmark
| | | | - Sabrina Islamoska
- Department of Public Health, University of Copenhagen, Copenhagen, Denmark
| | - Kazi Ishtiak-Ahmed
- Department of Public Health, University of Copenhagen, Copenhagen, Denmark
| | - Anne Helene Garde
- Department of Public Health, University of Copenhagen, Copenhagen, Denmark.,The National Research Centre for the Working Environment, Copenhagen, Denmark
| | - Finn Gyntelberg
- The National Research Centre for the Working Environment, Copenhagen, Denmark
| | - Erik Lykke Mortensen
- Department of Public Health, University of Copenhagen, Copenhagen, Denmark.,Center for Healthy Aging, University of Copenhagen, Copenhagen, Denmark
| | - Thien Kieu Thi Phung
- Danish Dementia Research Centre, University of Copenhagen, Rigshospitalet, Copenhagen, Denmark
| | - Gunhild Waldemar
- Danish Dementia Research Centre, University of Copenhagen, Rigshospitalet, Copenhagen, Denmark
| | - Rudi G J Westendorp
- Department of Public Health, University of Copenhagen, Copenhagen, Denmark.,Center for Healthy Aging, University of Copenhagen, Copenhagen, Denmark
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14
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Stuart KE, Padgett C. A Systematic Review of the Association Between Psychological Stress and Dementia Risk in Humans. J Alzheimers Dis 2020; 78:335-352. [DOI: 10.3233/jad-191096] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Background: It has been estimated that one third of dementia cases may be preventable through modifiable lifestyle interventions. Epidemiological evidence suggests a link between stressful life events and aging-related cognitive decline and dementia; however, inherent methodological limitations in examining subjective and biological measures of stress separately leads to interpretive constraints. Objective: The aim of the current study was to conduct a systematic review of the research literature investigating the effect of perceived and biological measures of stress on dementia risk. Methods: A systematic review was conducted of cohort, case-control, longitudinal prospective or retrospective studies examining the association between stress and risk of developing dementia. Studies were identified from a systematic search across major electronic databases from inception to February 2020. Results: Overall, 22 studies were identified including a total of 496,556 participants, approximately 50% were females, with sample sizes ranging from 62–270,977. There was considerable heterogeneity in the definition and measurement of stress. Most of the identified studies reported a significant positive association between stress and dementia risk. Conclusion: Evidenced from the current review is that personality traits linked to increased perceived stress and elevated reported perceived stress, are associated with greater statistical risk for dementia. However, this review highlights that caution must be exhibited in interpreting these findings, as methodological issues with confounding adjustment may mediate these results. Future research should focus on the investigation of stress on dementia risk with a full range of confounding adjustment, and on biological measures of stress.
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Affiliation(s)
- Kimberley E. Stuart
- Division of Psychology, School of Medicine, University of Tasmania, Australia
- Wicking Dementia Research and Education Centre, Tasmania, Australia
| | - Christine Padgett
- Division of Psychology, School of Medicine, University of Tasmania, Australia
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15
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Miller JB, Kauwe JSK. Predicting Clinical Dementia Rating Using Blood RNA Levels. Genes (Basel) 2020; 11:E706. [PMID: 32604772 PMCID: PMC7349260 DOI: 10.3390/genes11060706] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 06/11/2020] [Accepted: 06/24/2020] [Indexed: 12/16/2022] Open
Abstract
The Clinical Dementia Rating (CDR) is commonly used to assess cognitive decline in Alzheimer's disease patients and is included in the Alzheimer's Disease Neuroimaging Initiative (ADNI) dataset. We divided 741 ADNI participants with blood microarray data into three groups based on their most recent CDR assessment: cognitive normal (CDR = 0), mild cognitive impairment (CDR = 0.5), and probable Alzheimer's disease (CDR ≥ 1.0). We then used machine learning to predict cognitive status using only blood RNA levels. Only one probe for chloride intracellular channel 1 (CLIC1) was significant after correction. However, by combining individually nonsignificant probes with p-values less than 0.1, we averaged 87.87% (s = 1.02) predictive accuracy for classifying the three groups, compared to a 55.46% baseline for this study due to unequal group sizes. The best model had an overall precision of 0.902, recall of 0.895, and a receiver operating characteristic (ROC) curve area of 0.904. Although we identified one significant probe in CLIC1, CLIC1 levels alone were not sufficient to predict dementia status and cannot be used alone in a clinical setting. Additional analyses combining individually suggestive, but nonsignificant, blood RNA levels were significantly predictive and may improve diagnostic accuracy for Alzheimer's disease. Therefore, we propose that patient features that do not individually predict cognitive status might still contribute to overall cognitive decline through interactions that can be elucidated through machine learning.
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Affiliation(s)
| | - John S. K. Kauwe
- Department of Biology, Brigham Young University, Provo, UT 84602, USA;
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16
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Welberry HJ, Brodaty H, Hsu B, Barbieri S, Jorm LR. Measuring dementia incidence within a cohort of 267,153 older Australians using routinely collected linked administrative data. Sci Rep 2020; 10:8781. [PMID: 32472058 PMCID: PMC7260191 DOI: 10.1038/s41598-020-65273-w] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Accepted: 04/28/2020] [Indexed: 12/29/2022] Open
Abstract
To estimate dementia incidence rates using Australian administrative datasets and compare the characteristics of people identified with dementia across different datasets. This data linkage study used a cohort of 267,153 from the Australian 45 and Up Study. Participants completed a survey in 2006-2009 and subsequent dementia was identified through pharmaceutical claims, hospitalisations, aged care eligibility assessments, care needs at residential aged care entry and death certificates. Age-specific, and age-standardised incidence rates, incidence rate ratios and survival from first dementia diagnosis were estimated. Estimated age-standardised dementia incidence rates using all linked datasets was 16.8 cases per 1000 person years for people aged 65+. Comparing incidence rates to the global published rates suggested 77% of cases were identified but this varied by age with highest coverage among those aged 80-84 years (92%). Incidence rate ratios were inconsistent across datasets for: sex, socio-economic disadvantage, size of support network, marital status, functional limitations and diabetes. Median survival from first dementia diagnosis ranged from 1.80 years in the care needs dataset to 3.74 years in the pharmaceutical claims dataset. Characteristics of people identified with dementia in different administrative datasets reflect the factors that drive interaction with specific services; this may introduce bias in observational studies using a single data-source to identify dementia.
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Affiliation(s)
- Heidi J Welberry
- Centre for Big Data Research in Health, University of New South Wales, Sydney, New South Wales, Australia.
| | - Henry Brodaty
- Centre for Healthy Brain Ageing, School of Psychiatry, University of New South Wales, Sydney, New South Wales, Australia.,Dementia Centre for Research Collaboration, School of Psychiatry, University of New South Wales, Sydney, New South Wales, Australia
| | - Benjumin Hsu
- Centre for Big Data Research in Health, University of New South Wales, Sydney, New South Wales, Australia
| | - Sebastiano Barbieri
- Centre for Big Data Research in Health, University of New South Wales, Sydney, New South Wales, Australia
| | - Louisa R Jorm
- Centre for Big Data Research in Health, University of New South Wales, Sydney, New South Wales, Australia
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