Dementia Mortality Research Articles

Systematic screening of atrial fibrillation works, but is this our current priority?

Prevalence and incidence of atrial fibrillation (AF) increase with age, making it the most common cardiac arrhythmia in older people and a growing burden for healthcare services in developed countries [1]. Although AF has been associated with an increased risk of several adverse outcomes (systemic embolism, mortality, heart failure, hospitalization, symptom burden and poor quality of life, cognitive impairment and dementia), ischemic stroke (IS) represents its most feared consequence, accounting for roughly one third of ISs in the elderly.

The Impact of Dementia on Diabetes Control: An Evaluation of HbA1c Trajectories and Care Outcomes in Linked Primary and Specialist Care Data.

Diabetes self-care may become increasingly challenging as cognition declines. We sought to characterize glycated hemoglobin A1c (HbA1c) trajectories, markers of diabetes-related management, health care utilization, and mortality in people with preexisting type 2 diabetes (T2D) with and without dementia and based on the extent of cognitive impairment at the time of dementia diagnosis. Retrospective matched cohort study. Using a linkage between a primary care (Lambeth DataNet) and a secondary mental healthcare database, up to 5 individuals aged ≥65y with preexisting T2D without dementia were matched to each individual with dementia based on age, sex, and general practice. Comparisons were made for HbA1c trajectories (linear mixed effects models), markers of diabetes-related management and severity at dementia diagnosis (logistic regression), mortality (Cox regression), and health care utilization (multilevel mixed effects binomial regression). In 725 incident dementia and 3154 matched comparators, HbA1c trajectories differed by dementia status; HbA1c increased over time for mild dementia and non-dementia, but the increase was greater in the mild dementia group; for those with moderate-severe dementia, HbA1c decreased over time. Despite individuals with dementia having increased health care utilization around the time of dementia diagnosis, they were less likely to have had routine diabetes-related management. Patients with dementia had a higher prevalence of macrovascular complications and diabetes foot morbidity at dementia diagnosis and a higher mortality risk than those without dementia; these relationships were most marked in those with moderate-severe dementia. Our study has highlighted important differences in the monitoring, management, and control of diabetes in people with dementia. The effects of frailty and the extent of cognitive impairment on the ability to self-manage diabetes and on glycemic control may need to be considered in treatment guidelines and by primary care.

Multimorbidity and dementia risk in hospitalised patients: an administrative data linkage study of hospital patients in Northern Ireland.

IntroductionWhile chronic disease is a risk factor for dementia (Shang et al., 2020) studies addressing multimorbidity and dementia risk are limited. Multimorbidity leads to steeper dementia progression (Bauer, 2014; Haaksma, 2019) impacting cognitive dysfunction, cognitive decline and impairment (Wei, 2020; Vassilaki, 2015). Multimorbidity has generally been examined using a dose- response disease count, something cited as impractical for clinicians due to information deficits on identifying disease specific pathways (Whitty, 2020). Thus, differentiating disease clusters and dementia risk will provide insight into the pathophysiology of dementia, while informing priority targets for early intervention, potentially reducing burden and secondary care costs. AimTo investigate dementia risk and mortality in older adults with different disease patterns, characteristics of hospital admissions, medication use and the role of locale of residence. Data linkage and analysisWe used national data defined by the NHAIS, including basic demographics for all patients aged fifty-five plus and registered with a GP in Northern Ireland. The linked data comprised: Patient Admissions and Discharges (from 2013-2021); Electronically captured prescribing data, area-type of usual residence; Multiple Deprivation Indicators; and GRO mortality data (including cause of death). We identified multimorbidity through validated algorithms for ICD-10 coding of thirty morbidities in administrative hospital diagnostics data (Tonelli et al., 2019). The same data identified dementia-free patients at baseline. Latent Class Analysis assigned patient groups by the patterning of multimorbidity states, following them through the study period, with analysis in relation to subsequent diagnoses of both clinical dementia and mortality. As age has a potential modifier effect we tested through age group stratified analyses. A series of multinomial logistic regression models further examine (for the multimorbidity sub-groups of interest) risks associated socio-demographic, socio-economic, medication use and household indicators at the individual, family and area level. ResultsMultimorbidity occurs in two thirds, approximately, of this hospital population of older adults. By age sixty-five years, most people are multimorbid. We identify subgroups of multimorbidity associated with dementia onset and mortality, combinations of diabetes, hypertension, chronic kidney disease and cancer multimorbidity are highlighted as higher-risk conditions for increased dementia incidence and mortality. Greater disease burden is associated with frequent healthcare service use, medication use and is more common in the most socioeconomically deprived, compared with the least deprived. DiscussionEvidence on multimorbidity patterns and dementia is limited (Grande, 2021). Our study suggests that people with combinations of diabetes, hypertension, chronic kidney disease and cancer multimorbidity are associated with increased risks for dementia and socio demographic and economic circumstances further increase this risk. Overlapping combinations comprising chronic kidney disease + hypertension, or diabetes + hypertension, were a significant proportion of total secondary care costs for patients with multimorbidity; combinations comprising chronic heart failure + chronic kidney disease + hypertension had the highest proportion of total cost from potentially preventable emergency admissions (Stokes et al., 2021). Our finding support the body and mind connection in dementia development. Thus, we note that cardiovascular health is associated with dementia (Grande, 2021). Often described as a heart-brain connection, cardiovascular disease leads to higher dementia risk due to a number of mechanisms including but not limited to chronic inflammation (Grande, 2021). Identifying such high-risk groups will facilitate tailored interventions for dementia prevention and the reduction of healthcare use and costs.

Temporal changes in personal activity intelligence and the risk of incident dementia and dementia related mortality: A prospective cohort study (HUNT).

SummaryBackgroundThe Personal Activity Intelligence (PAI) translates heart rate during daily activity into a weekly score. Obtaining a weekly PAI score ≥100 is associated with reduced risk of premature morbidity and mortality from cardiovascular diseases. Here, we determined whether changes in PAI score are associated with changes in risk of incident dementia and dementia-related mortality.MethodsWe conducted a prospective cohort study of 29,826 healthy individuals. Using data from the Trøndelag Health-Study (HUNT), PAI was estimated 10 years apart (HUNT1 1984–86 and HUNT2 1995–97). Adjusted hazard-ratios (aHR) and 95%-confidence intervals (CI) for incidence of and death from dementia were related to changes in PAI using Cox regression analyses.FindingsDuring a median follow-up time of 24.5 years (interquartile range [IQR]: 24.1-25.0) for dementia incidence and 23.6 years (IQR: 20.8–24.2) for dementia-related mortality, there were 1998 incident cases and 1033 dementia-related deaths. Individuals who increased their PAI score over time or maintained a high PAI score at both assessments had reduced risk of dementia incidence and dementia-related mortality. Compared with persistently inactive individuals (0 weekly PAI) at both time points, the aHRs for those with a PAI score ≥100 at both occasions were 0.75 (95% CI: 0.58–0.97) for incident dementia, and 0.62 (95% CI: 0.43–0.91) for dementia-related mortality. Using PAI score <100 at both assessments as the reference cohort, those who increased from <100 at HUNT1 to ≥100 at HUNT2 had aHR of 0.83 (95% CI: 0.72–0.96) for incident dementia, and gained 2.8 (95% CI: 1.3–4.2, P<0.0001) dementia-free years. For dementia-related mortality, the corresponding aHR was 0.74 (95% CI: 0.59–0.92) and years of life gained were 2.4 (95% CI: 1.0–3.8, P=0.001).InterpretationMaintaining a high weekly PAI score and increases in PAI scores over time were associated with a reduced risk of incident dementia and dementia-related mortality. Our findings extend the scientific evidence regarding the protective role of PA for dementia prevention, and suggest that PAI may be a valuable tool in guiding research-based PA recommendations.FundingThe Norwegian Research Council, the Liaison Committee between the Central Norway Regional Health Authority and Norwegian University of Science and Technology (NTNU), Trondheim, Norway.

Association between short-term exposure to ambient air pollution and dementia mortality in Chinese adults

BackgroundShort-term exposure to ambient air pollution has been linked to an increased risk of mortality from a variety of causes, but its effects on mortality from dementia remain largely unknown. ObjectivesTo investigate the association between short-term exposure to ambient air pollution and dementia mortality, and quantitatively assess the excess mortality. MethodsIn this time-stratified case-crossover study, 47,108 dementia deaths were identified in Jiangsu province, China during 2015–2019. Exposure to particulate matter with an aerodynamic diameter ≤ 2.5 μm (PM2.5), PM10, sulfur dioxide (SO2), nitrogen dioxide (NO2), carbon monoxide (CO), and ozone (O3) was assessed by extracting daily concentrations from a validated grid dataset based on each subject's residential address. Conditional logistic regression models were applied for exposure-response analyses. ResultsThere were 47,108 case days and 159,852 control days during the study period. Each 10 μg/m3 increase of lag 04-day exposure to PM2.5, PM10, and NO2 was significantly associated with a 1.43 % (95 % CI: 0.77, 2.09 %), 1.06 % (0.59, 1.54 %), and 2.80 % (1.51, 4.10 %) increase in odds of dementia mortality, corresponding to an excess mortality of 4.87 %, 5.50 %, and 6.43 %, respectively. We estimated that reducing ambient air pollutant exposures to the WHO air quality guidelines would avoid up to 4.17 % of the dementia deaths, while the ambient air quality standards in China would only help avoid up to 0.39 %. ConclusionsThis study provides consistent evidence that short-term exposure to PM2.5, PM10, and NO2 is associated with increased odds of dementia mortality, which can be translated to a considerable excess mortality. Our findings highlight a potential approach to prevent deaths from dementia by reducing individual exposures to ambient air pollution, especially in areas with high levels of ambient air pollution.

Association between preoperative dementia and hospital mortality in old old patients undergoing elective gastrointestinal surgery.

Although many reports have shown that preoperative dementia affects surgical prognosis, it is unclear whether the dementia based on Mini-Mental State Examination (MMSE) affect hospital mortality in old old patients undergoing elective gastrointestinal surgery. This study aims to investigate whether preoperative dementia might affect the outcomes of old old patients undergoing elective gastrointestinal surgery by evaluating with the MMSE. All patients aged ≥ 75years who undergoing elective gastrointestinal surgery form January 2015 to December 2021 in a Chinese tertiary hospital were retrospectively analyzed. Their preoperative cognitive status was evaluated using the MMSE, and analysis was performed to compare the patients with MMSE score < 24 (dementia group) or MMSE score 24-30 (non-dementia group). Risk factors for hospital mortality were explored using multivariate logistic regression analysis. 980 patients were rolled in the study, and 102 (10.4%) patients were in the dementia group. ICU and hospital stay were longer in the dementia group. Regarding the postoperative complications, the incidence of cerebral infarction (P = 0.014), delirium (P = 0.019), and pulmonary infection (P = 0.017) was more frequent in dementia group. Hospital mortality was 11% in the dementia group and 3% in the non-dementia group (P = 0.009). Multivariate logistic regression analysis revealed that dementia (P = 0.0135), preoperative lower albumin (P = 0.0018) and malignancy (P = 0.0212) were independent risk factors for hospital mortality. Among old old patients undergoing elective gastrointestinal surgery, hospital mortality was increased significantly for patients with dementia evaluating with the MMSE.

Rural health disparities in health care utilization for dementia in Minnesota.

We visualized rural-urban differences in inpatient hospitalization and emergency department (ED) health care utilization (HCU) for older adults with dementia to understand the HCU of rural versus urban older adults in Minnesota and to examine in greater detail the variability of HCU in rural areas. For 3 older adult age groups, we utilized Healthcare Cost and Utilization Project (H-CUP) datasets from 2016 to 2018 to profile hospital admission rates, and ED visit rates related to dementia stratified by rurality and regions. Rates were visualized by spatial interpolation method. We then used logistic regression analysis adjusted by multiple covariates to evaluate rural-urban differences of the chance of having a dementia diagnosis in HCU. Minnesota rural areas showed 17.6% lower age-adjusted rate (AAR) of dementia mortality than urban areas. AARs of ED visits for dementia were 12.4% higher in rural ZIP codes, whereas AARs of hospitalization were 24.7% lower. After controlling for neighborhood-level risk factors, such as income, education, health behaviors, and provider access, the odds ratios of having dementia diagnosis are 12% lower if an ED visit patient lives in rural as opposed to an urban area (OR = 0.88, P<.0001). In comparison to AAR, the fully adjusted data showed larger rural-urban predictors of having dementia diagnoses in hospitalizations and ED utilizations and demonstrated differences between AAR of ED visit and odds ratios of having dementia diagnosis. A regional comparison revealed that dementia ED visits were higher for Northeast MN compared to Minnesota's largest metropolitan region.

Secular trends in the prevalence of dementia based on a community-based complete enumeration in Japan: the Nakayama Study.

BackgroundThe number of dementia patients is increasing worldwide, especially in Japan, which has the world's highest ageing population. The increase in the number of older people with dementia is a medical and socioeconomic problem that needs to be prevented, but the actual situation is still not fully understood.MethodsFour cross‐sectional studies on dementia were conducted in 1997, 2004, 2012, and 2016 for complete enumeration of all residents aged 65 years and older. We examined the secular trends in the prevalence of all‐cause dementia, Alzheimer's disease (AD), vascular dementia (VaD), and other/unclassified dementia.ResultsThe age‐standardised prevalence of all‐cause dementia significantly increased (4.5% in 1997, 5.7% in 2004, 5.3% in 2012, 9.5% in 2016; P for trend <0.05). Similar trends were observed for AD (1.7%, 3.0%, 2.5% and 4.9%, respectively; P for trend <0.05) and other/unclassified dementia (0.8%, 1.0%, 1.0% and 2.2%, respectively; P for trend <0.05), whereas no significant change in VaD was seen (2.1%, 1.8%, 1.8%, 2.4%, respectively; P for trend = 0.77). The crude prevalence of all‐cause dementia and AD increased from 1997 to 2016 among participants aged 75–79 years and ≥85 years (all P for trend <0.05). Similar trends were observed for other/unclassified dementia among participants aged ≥80 years (all P for trend <0.05), but not in VaD.ConclusionsThe prevalence of dementia has increased beyond the ageing of the population, suggesting that factors in addition to ageing are involved in the increase in the number of older people with dementia. To control the increase in the number of older people with dementia, elucidation of secular trends in the incidence, mortality, and prognosis of dementia as well as the factors that promote and protect against dementia, and development of preventive strategies are necessary.

The trajectories of depressive symptoms and subsequent incident dementia, coronary heart diseases, stroke and all-cause mortality

BackgroundEvidence suggests the occurrence of depressive symptoms in mid- to late-life inflates the risk for ageing-related morbidity compared to people without depressive symptoms. The eventual association between depressive symptoms in mid- to late-life and long-term (over 10-year) risks for incident dementia, coronary heart disease (CHD), stroke, and morbidity is to be established. MethodsThis longitudinal cohort study utilized Health and Retirement Study (HRS) of U.S residents aged ≥ 50 years who were interviewed every 2-year during follow-up (average follow-up: 11.6 ± 2.85 years). Trajectories of depressive symptoms were assessed by the Center for Epidemiologic Studies Depression (CES-D) scale from 1994 to 2000 at baseline. Incident dementia, CHD, stroke and all-cause mortality were determined from 2000 to 2018. ResultsAmong 7810 individuals who were free from dementia, CHD and stroke, five trajectories of depressive symptoms were identified: non-depressed (36.7 %), mild (48.8 %), worsening (7.8 %), improving (4.1 %) and persistent (2.7 %). Compared with those in the non-depressed group, participants with mild, worsening and persistent depressive symptoms had significantly greater hazards of incident dementia (multivariable adjusted hazard ratios and 95 % confidence intervals: 1.32 [1.17–1.48], 1.58 [1.30–1.93], 2.82 [2.17–3.67], respectively), CHD (1.13 [1.03–1.24], 1.47 [1.25–1.73], 1.34 [1.03–1.74], respectively), stroke (1.30 [1.12–1.52], 1.58 [1.23–2.04], 1.71 [1.16–2.53], respectively) and all-cause mortality (1.17 [1.07–1.27], 1.46 [1.27–1.68], 1.66 [1.35–2.06], respectively). The hazards of incident events, except for CHD, were not significantly greater in individuals with improving depressive symptoms. ConclusionsThe present findings suggest even sub-clinical threshold depressive symptoms were associated with the hazards of ageing related diseases while such associations were not significant with managed depressive symptoms.

P94. A Transdiagnostic Study of Morphometric Similarity Networks in Delusions in Dementia

Delusions in dementia of the Alzheimer’s type (DAT) and behavioral variant frontotemporal dementia (bvFTD) are distressing and lead to psychiatric misdiagnoses, and antipsychotic use has been found to predict mortality in dementia. We identified structural brain networks associated with delusions across bvFTD and DAT.

Handgrip strength and all-cause dementia incidence and mortality: findings from the UK Biobank prospective cohort study.

BackgroundThis study aimed to investigate the associations of grip strength with incidence and mortality from dementia and whether these associations differ by sociodemographic and lifestyle factors.MethodsA total of 466 788 participants of the UK Biobank (median age 56.5 years, 54.5% women). The outcome was all‐cause dementia incidence and mortality and the exposure was grip strength. Grip strength was assessed using a Jamar J00105 hydraulic hand dynamometer.ResultsExcluding the first 2 years of follow‐up (landmark analysis), mean follow‐up was 9.1 years (inter‐quartile range: 8.3; 9.7) for incidence and 9.3 (inter‐quartile range: 8.7; 10.0) for mortality. During this time, 4087 participants developed dementia, and 1309 died from it. Lower grip strength was associated with a higher risk of dementia incidence and mortality independent of major confounding factors (P < 0.001). Individuals in the lowest quintile of grip strength had 72% [95% confidence interval (CI): 1.55; 1.92] higher incident dementia risk and 87% [95% CI: 1.55; 2.26] higher risk of dementia mortality compared with those in the highest quintile. Our PAF analyses indicate that 30.1% of dementia cases and 32.3% of dementia deaths are attributable to having low grip strength. The association between grip strength and dementia outcomes did not differ by lifestyle or sociodemographic factors.ConclusionsLower grip strength was associated with a higher risk of all‐cause dementia incidence and mortality, independently of important confounding factors.

Association of Cumulative Blood Pressure With Cognitive Decline, Dementia, and Mortality

BackgroundElevated blood pressure (BP) has been linked to impaired cognition and dementia in older adults. However, few studies have accounted for long-term cumulative BP exposure. ObjectivesThe aim of this study was to test whether long-term cumulative BP was independently associated with subsequent cognitive decline, incident dementia, and all-cause mortality among cognitively healthy adults. MethodsThis study used data from the HRS (Health and Retirement Study) and ELSA (English Longitudinal Study of Ageing). Cumulative BP was calculated as the area under the curve using measurements from wave 0 (1998-1999) to wave 4 (2008-2009) in ELSA and wave 8 (2006-2007) to wave 10 (2010-2011) in the HRS. Outcomes included cognitive decline, incident dementia, and all-cause mortality. ResultsA total of 7,566 and 9,294 participants from ELSA and the HRS were included (44.8% and 40.2% men and median age 62.0 years [IQR: 55.0-70.0 years] and 65.0 years [IQR: 58.0-72.0 years], respectively). The median follow-up duration was 8.0 years (IQR: 4.0-8.0 years) and 8.0 years (IQR: 6.0-8.0 years), respectively. Elevated cumulative systolic BP and pulse pressure were independently associated with accelerated cognitive decline (P < 0.001 for both), elevated dementia risk (P < 0.001 for both), and all-cause mortality (P < 0.001 for both), while a significant inverse association was observed for diastolic BP. Strong dose-response relationships were identified, with similar results for the 2 cohorts. ConclusionsLong-term cumulative BP was associated with subsequent cognitive decline, dementia risk, and all-cause mortality in cognitively healthy adults aged ≥50 years. Efforts are required to control long-term systolic BP and pulse pressure and to maintain adequate diastolic BP.

Serum folate deficiency and the risks of dementia and all-cause mortality: a national study of old age

BackgroundThe association between serum folate deficiency and the risk of dementia in old age is unclear, perhaps owing to small sample sizes, the competing risk of mortality or reverse causation.ObjectiveTo...

Incidence, morbidity, mortality and disparities in dementia: A population linked electronic health records study of 4.3 million individuals.

We report dementia incidence, comorbidities, reasons for health-care visits, mortality, causes of death, and examined dementia patterns by relative deprivation in the UK. A longitudinal cohort analysis of linked electronic health records from 4.3 million people in the UK was conducted to investigate dementia incidence and mortality. Reasons for hospitalization and causes of death were compared in individuals with and without dementia. From 1998 to 2016 we observed 145,319 (3.1%) individuals with incident dementia. Repeated hospitalizations among senior adults for infection, unknown morbidity, and multiple primary care visits for chronic pain were observed prior to dementia diagnosis. Multiple long-term conditions are present in half of the individuals at the time of diagnosis. Individuals living in high deprivation areas had higher dementia incidence and high fatality. There is a considerable disparity of dementia that informs priorities of prevention and provision of patient care.

Is the Rise in Reported Dementia Mortality Real? Analysis of Multiple-Cause-of-Death Data for Australia and the United States.

Official statistics in Australia and the United States show large recent increases in dementia mortality rates. In this study, we assessed whether these trends are biased by an increasing tendency of medical certifiers (predominantly physicians) to report on the death certificate that dementia was a direct cause of death. Regression models of multiple-cause-of-death data in Australia (2006–2016) and the United States (2006–2017) were constructed to adjust dementia mortality rates for changes in death certification practices. Compared with official statistics, the recent increase in adjusted age-standardized dementia death rates was less than half as large in Australia and about two-thirds as large in the United States. Further adjustment for changes in reporting of dementia anywhere on the death certificate implied even lower increases in dementia mortality. Declines in reporting of cardiovascular diseases as comorbid conditions also contributed to rises in dementia mortality rates. The increasing likelihood of dementia’s being reported as directly leading to death largely explains recent increases in dementia mortality rates in both countries. However, studies have found that reported dementia on death certificates remains low compared with clinical evaluations of its prevalence. Improved guidance and training for certifiers in reporting of dementia on death certificates will help standardize mortality statistics within and between countries.

Glucose-Lowering Medications and Post-Dementia Survival in Patients with Diabetes and Dementia.

Background:The effectiveness of glucose-lowering drugs (GLDs) is unknown among patients with dementia.Objective:To analyze all-cause mortality among users of six GLDs in dementia and dementia-free subjects, respectively.Methods:This was a longitudinal open-cohort registry-based study using data from the Swedish Dementia Registry, Total Population Register, and four supplemental registers providing data on dementia status, drug usage, confounders, and mortality. The cohort comprised 132,402 subjects with diabetes at baseline, of which 11,401 (8.6%) had dementia and 121,001 (91.4%) were dementia-free. Subsequently, comparable dementia – dementia-free pairs were sampled. Then, as-treated and intention-to-treat exposures to metformin, insulin, sulfonylurea, dipeptidyl-peptidase-4 inhibitors, glucagon-like peptide-1 analogues (GLP-1a), and sodium-glucose cotransporter-2 inhibitors (SGLT-2i) were analyzed in the parallel dementia and dementia-free cohorts. Confounding was addressed using inverse-probability weighting and propensity-score matching, and flexible parametric survival models were used to produce hazard ratios (HR) and 95% confidence intervals (CI) of the association between GLDs and all-cause mortality.Results:In the as-treated models, increased mortality was observed among insulin users with dementia (HR 1.34 [95%CI 1.24–1.45]) as well as in dementia-free subjects (1.54 [1.10–1.55]). Conversely, sulfonylurea was associated with higher mortality only in dementia subjects (1.19 [1.01–1.42]). GLP-1a (0.44 [0.25–0.78]) and SGLT-2i users with dementia (0.43 [0.23–0.80]) experienced lower mortality compared to non-users.Conclusion:Insulin and sulfonylurea carried higher mortality risk among dementia patients, while GLP-1a and SGLT-2i were associated with lower risk. GLD-associated mortality varied between dementia and comparable dementia-free subjects. Further studies are needed to optimize GLD use in dementia patients.

Large household reduces dementia mortality: A cross-sectional data analysis of 183 populations.

Large households/families may create more happiness and offer more comprehensive healthcare among the members. We correlated household size to dementia mortality rate at population level for analysing its protecting role against dementia mortality. This is a retrospective cross-sectional study. Dementia specific mortality rates of the 183 member states of World Health Organization were calculated and matched with the respective country data on household size, Gross Domestic Product (GDP), urban population and ageing. Scatter plots were produced to explore and visualize the correlations between household size and dementia mortality rates. Pearson's and nonparametric correlations were used to evaluate the strength and direction of the associations between household size and all other variables. Partial correlation of Pearson's approach was used to identify that household size protects against dementia regardless of the competing effects from ageing, GDP and urbanization. Multiple regression was used to identify significant predictors of dementia mortality. Household size was in a negative and moderately strong correlation (r = -0.6034, p < 0.001) with dementia mortality. This relationship was confirmed in both Pearson r (r = - 0.524, p<0.001) and nonparametric (rho = -0.579, p < 0.001) analyses. When we controlled for the contribution of ageing, socio-economic status and urban lifestyle in partial correlation analysis, large household was still in inverse and significant correlation to dementia mortality (r = -0.331, p <0.001). This suggested that, statistically, large household protect against dementia mortality regardless of the contributing effects of ageing, socio-economic status and urban lifestyle. Stepwise multiple regression analysis selected large household as the variable having the greatest contribution to dementia mortality with R2 = 0.263 while ageing was placed second increasing R2 to 0.259. GDP and urbanization were removed as having no statistically significant influence on dementia mortality. While acknowledging ageing, urban lifestyle and greater GDP associated with dementia mortality, this study suggested that, at population level, household size was another risk factor for dementia mortality. As part of dementia prevention, healthcare practitioners should encourage people to increase their positive interactions with persons from their neighbourhood or other fields where large household/family size is hard to achieve.

Long-term physical activity participation trajectories were associated with subsequent cognitive decline, risk of dementia and all-cause mortality among adults aged ≥50years: a population-based cohort study.

to evaluate self-reported physical activity (PA) participation trajectories over a 6-year span and to assess associations with subsequent cognitive decline, incident dementia and all-cause mortality. population-based cohort of 8,842 community-dwelling adults aged ≥50years in England. Group-based trajectory modelling was used to identify 6-year trajectories of PA participation. Cognitive decline, incident dementia and all-cause mortality were outcomes. five trajectories were identified, including persistently low (N = 2,511), initially low then improving (1,651), initially high then declining (249), persistently moderate (2,422) and persistently high (2,009). Compared with persistently low, participants of initially low then improving and persistently high PA participation experienced decelerated global cognitive decline of 0.012 standard deviation (SD)/year (95% confidence interval [CI]: 0.004-0.021, P =0.004) and 0.021 SD/year (95% CI: 0.013-0.029, P < 0.001). They were also associated with lower dementia risk, with multivariate-adjusted hazard ratios (HRs) of 0.43 (95% CI: 0.31-0.60) and 0.35 (95% CI: 0.27-0.45). A similar pattern was observed for all-cause mortality, with HRs of 0.31 (95% CI: 0.13-0.74) and 0.25 (95% CI: 0.14-0.45). No significant differences were observed between persistently low and initially high then declining trajectories. for middle-aged and older adults, both gradually improved and persistently active PA participation were associated with decelerated cognitive decline, lower risk of dementia and all-cause mortality. Strategies focusing on improving and maintaining PA participation could be of significance by attaining considerable neurocognitive and longevity benefits.

The Impact of Disease Registries on Advancing Knowledge and Understanding of Dementia Globally.

To help address the increasing challenges related to the provision of dementia care, dementia registries have emerged around the world as important tools to gain insights and a better understanding of the disease process. Dementia registries provide a valuable source of standardized data collected from a large number of patients. This review explores the published research relating to different dementia registries around the world and discusses how these registries have improved our knowledge and understanding of the incidence, prevalence, risk factors, mortality, diagnosis, and management of dementia. A number of the best-known dementia registries with high research output including SveDem, NACC, ReDeGi, CREDOS and PRODEM were selected to study the publication output based on their data, investigate the key findings of these registry-based studies. Registries data contributed to understanding many aspects of the disease including disease prevalence in specific areas, patient characteristics and how they differ in populations, mortality risks, as well as the disease risk factors. Registries data impacted the quality of patients’ lives through determining the best treatment strategy for a patient based on previous patient outcomes. In conclusion, registries have significantly advanced scientific knowledge and understanding of dementia and impacted policy, clinical practice care delivery.

Abstract WP205: Trans-ethnic Genome-wide Association Studies Meta-analysis Of Large Brain Arterial Diameters Identifies Two Novel Genetic Loci

Introduction: Larger brain arterial diameters, which may be a consequence of connective tissue disorders or hypertension, are associated with mortality, cognitive decline and risk of dementia. Whether there may be genetic determinants of large brain arterial diameters is unknown, but identifying such traits may shed light into possible mechanistic links between large brain arterial diameters and the observed outcomes. Methods: We studied 3654 participants from four ethnically diverse population-based cohorts: The Atherosclerosis Risk in Communities study (n=1565: 74.3% white, 25.7% black), The Northern Manhattan Study (n=1092: 13.8% white, 16.6% black, 69.6% Hispanic), Epidemiology of Dementia in Singapore (n=647: 31.7% Chinese, 35.7% Malay, 32.6% Indian), and Memory Clinic Cohort in Singapore (n=350: 84.9% Chinese, 7.8% Malay, 7.3% Indian). We measured brain arterial diameters for 13 segments and normalized the averaged diameter per participant to obtain global brain arterial diameter as dependent variable. Genome-wide association studies (GWAS) was performed in each study using linear regression, adjusted for sex, age, head size, number of missing arteries and population substructure. Meta-analysis of association statistics was performed using the METAL to generate combined trait-specific effect estimates. We also performed trans-ethnic meta-regression by MR-MEGA to account for the heterogeneity in allelic effect that is correlated with ancestry. Results: Genome-wide significant (P&lt;5x10 -8 ) associations were observed for global brain arterial diameter with three SNPs: rs7921574(P=1.2x10 -8 ) mapping to an intron of CNNM2; rs2075858(P=2.47x10 -8 ) and rs2075857 (P=2.37x10 -8 ) mapping to introns of MUC5B. MR-MEGA analysis showed suggestive evidence of association (P=5.05x10 -8 ) for rs7921574. These loci comprise genes involved in response to magnesium transport, neuronal transmission, hypertension, mucociliary clearance and host defense. Conclusion: Our study reveals two novel risk loci for large brain arterial diameters. We have begun to replicate these associations and to identify functional causal variants in independent studies. Identifying these loci may help us to elucidate underlying disease mechanisms.