scholarly journals Systematic Review on the Impact of Intelligence on Cognitive Decline and Dementia Risk

2020 ◽  
Vol 11 ◽  
Author(s):  
Francisca S. Rodriguez ◽  
Thomas Lachmann
Keyword(s):  
Systematic Review ◽  
Cognitive Decline ◽  
Dementia Risk ◽  
The Impact

Adverse effects of ADT on cognitive function and dementia for men with prostate cancer: A meta-analysis and systematic review.

2017 ◽  
Vol 35 (6_suppl) ◽  
pp. 150-150 ◽  
Author(s):  
Maxine Sun ◽  
Alexander Cole ◽  
Nawar Hanna ◽  
Adam S. Kibel ◽  
Toni K. Choueiri ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Systematic Review ◽  
Cognitive Function ◽  
Cognitive Decline ◽  
English Language ◽  
Meta Analysis ◽  
Pooled Analysis ◽  
Cochrane Library ◽  
Significant Heterogeneity ◽  
The Impact

150 Background: Nearly 50% of men diagnosed with prostate cancer may receive treatment with some form of androgen deprivation therapy (ADT). While some side effects of ADT are well acknowledged, the specific impact of ADT on cognitive function is uncertain. Our objective was to perform a systematic review and meta-analysis assessing the impact of ADT on overall cognitive decline, and the risks of Alzheimers, Parkinson’s disease. Methods: Relevant studies were identified through search of English language articles indexed in PubMed Medline, PsycINFO, Cochrane Library and Web of Knowledge/Science. First, we assessed rates of cognitive decline in five cohorts from three studies. Second, we assessed rates of Alzheimer’s or Parkinson disease using three large retrospective studies. A pooled-analysis was conducted using a meta-analysis. Weighted averages were reported as odds ratios (OR) with 95% confidence intervals (CI) using RevMan and a DerSimonian and Laird random-effects model. The heterogeneity test was measured using the Q-Mantel-Haenszel ( P< 0.10 was considered of significant heterogeneity). Results: With respect to overall cognitive decline (defined as scoring 1.5 standard deviations [SD] in two or more objective cognitive tests), patients receiving ADT had higher odds of overall cognitive decline than patients with prostate cancer not treated with ADT or health controls (OR: 2.03, 95% CI: 1.42–2.90). Furthermore, men with a history of ADT for prostate cancer had higher odds of developing Alzheimer’s and Parkinson dementia compared to men with prostate cancer not treated with ADT (OR: 1.32, 95% CI: 1.27–1.37). Conclusions: Men receiving ADT for prostate cancer performed significantly worse on measures of overall cognitive function. Additionally, results from the three large observational trials included suggest men exposed to ADT for prostate cancer have higher rates of Parkinson/Alzheimer’s compared to men without ADT.

Fish intake, n-3 fatty acid body status, and risk of cognitive decline: a systematic review and a dose–response meta-analysis of observational and experimental studies

2021 ◽  
Author(s):  
Rena I Kosti ◽  
Maria I Kasdagli ◽  
Andreas Kyrozis ◽  
Nicola Orsini ◽  
Pagona Lagiou ◽  
...  
Keyword(s):  
Systematic Review ◽  
Fatty Acid ◽  
Executive Functions ◽  
Cognitive Decline ◽  
Cognitive Performance ◽  
Dose Response ◽  
Experimental Studies ◽  
Fish Intake ◽  
Risk Of Bias ◽  
The Impact

Abstract Context Randomized controlled trials (RCTs) testing supplementation with eicosapentaenoic (EPA) and docosahexaenoic (DHA) fatty acids have failed to provide evidence supporting a suggested inverse association between fish intake and dementia risk. Objective Dose–response analyses were conducted to evaluate associations between fish intake, all-cause dementia or Alzheimer’s Disease (AD), and the effect of EPA/DHA supplementation on cognitive performance. Data Sources PubMed, Scopus and Web of Science databases were searched for original research evaluating either associations between fish intake and dementia or AD, or the impact of EPA and/or DHA supplementation on the risk of cognitive decline. Data Extraction Data were collected on study characteristics and methods; number of cases/deaths (for observational studies); categories of exposure; model covariates; risk estimates from the most-adjusted model; type and dosage of supplementation (from RCTs); fatty acid levels in blood; and differences in cognition test results before and after supplementation. Risk of bias was assessed through the ROBINS-E and RoB2.0 tools for observational and experimental studies, respectively. Data Analysis Weighted mixed-effects models were applied, allowing for the inclusion of studies with 2 levels of exposure. Based on findings with low/moderate risk of bias, fish intake of up to 2 portions (250 g) per week was associated with a 10% reduction (95% confidence interval [CI]: 0.79, 1.02, Ν = 5) in all-cause dementia and a 30% reduction (95% CI: 0.54, 0.89, Ν = 3) in AD risk. Changes in EPA and DHA body status had a positive impact on participants’ executive functions, but not on their overall cognitive performance. Conclusion The protection offered by fish intake against cognitive decline levels off at intakes higher than 2 portions/week and likely relates to the impact of EPA and DHA on the individual’s executive functions, although there remain questions about the mechanisms linking the short- and long-term effects. Systematic Review Registration PROSPERO registration no. CRD42019139528.

scholarly journals A SYSTEMATIC REVIEW OF OBSERVATIONAL STUDIES ASSESSING THE IMPACT OF OXIDATIVE STRESS IN COGNITIVE DECLINE

2021 ◽  
Vol 74 (8) ◽  
pp. 1995-2003
Author(s):  
Ioanna V. Papathanasiou ◽  
Evangelos C. Fradelos ◽  
Foteini Malli ◽  
Ioannis Stefanidis ◽  
Elias Zintzaras ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Systematic Review ◽  
Cognitive Function ◽  
Cognitive Decline ◽  
Observational Studies ◽  
Quality Criteria ◽  
Oxidative Stress Biomarkers ◽  
Cross Sectional ◽  
Oxidative Markers ◽  
The Impact

Introduction: Cognitive functions are defined as the mental processes through which information is received, processed, stored, and retrieved. Oxidation is considered as an important factor that affects negatively the brain function. The aim: To assess the impact of oxidative stress, as it is measured by oxidative markers or by the presence of anti-oxidants, on cognitive decline. Materials and methods: A systematic review of published observational studies in PubMed and in Scopus was performed. During the review process the keywords were used as follows: (“oxidative stress”) AND (“cognitive decline” OR “cognitive dysfunction” OR “cognitive impairment” OR “cognitive deficiency”) AND (“observational study” OR “cross sectional study” OR “prospective study” OR “retrospective study” OR “cohort study”). The search was conducted for the years from 2016 to 2020. Conclusions: Seventy-four eligible studies were identified. Thirteen studies met the inclusion and quality criteria and were included in the systematic review. The studies conducted in ten different countries. Information about oxidative stress biomarkers is available in eight studies, while information about antioxidant factors is in ten studies. In all the thirteen studies the cognitive function was assessed with specific tools – scales. In the majority of studies, the presence of high scores in oxidative markers was positively associated with cognitive decline, while higher levels of antioxidant markers were associated with better cognitive function. Our results indicate that oxidative stress may be significantly associated with cognitive decline. The presence of the antioxidants glutathione, uric acid, melatonin, cysteine and peroxide dismutase has a positive effect on cognitive function.

scholarly journals Combining modifiable risk factors and risk of dementia: a systematic review and meta-analysis

BMJ Open ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. e022846 ◽  
Author(s):  
Ruth Peters ◽  
Andrew Booth ◽  
Kenneth Rockwood ◽  
Jean Peters ◽  
Catherine D’Este ◽  
...  
Keyword(s):  
Risk Factors ◽  
Systematic Review ◽  
Risk Factor ◽  
Cognitive Decline ◽  
Full Text ◽  
Meta Analysis ◽  
Modifiable Risk Factors ◽  
Increased Risk ◽  
The Impact

ObjectiveTo systematically review the literature relating to the impact of multiple co-occurring modifiable risk factors for cognitive decline and dementia.DesignA systematic review and meta-analysis of the literature relating to the impact of co-occurring key risk factors for incident cognitive decline and dementia. All abstracts and full text were screened independently by two reviewers and each article assessed for bias using a standard checklist. A fixed effects meta-analysis was undertaken.Data sourcesDatabases Medline, Embase and PsycINFO were searched from 1999 to 2017.Eligibility criteriaFor inclusion articles were required to report longitudinal data from participants free of cognitive decline at baseline, with formal assessment of cognitive function or dementia during follow-up, and an aim to examine the impact of additive or clustered comorbid risk factor burden in with two or more core modifiable risk factors.ResultsSeventy-nine full-text articles were examined. Twenty-two articles (18 studies) were included reporting data on >40 000 participants. Included studies consistently reported an increased risk associated with greater numbers of intraindividual risk factors or unhealthy behaviours and the opposite for healthy or protective behaviours. A meta-analysis of studies with dementia outcomes resulted in a pooled relative risk for dementia of 1.20 (95% CI 1.04 to 1.39) for one risk factor, 1.65 (95% CI 1.40 to 1.94) for two and 2.21 (95% CI 1.78 to 2.73) for three or more, relative to no risk factors. Limitations include dependence on published results and variations in study outcome, cognitive assessment, length of follow-up and definition of risk factor exposure.ConclusionsThe strength of the reported associations, the consistency across studies and the suggestion of a dose response supports a need to keep modifiable risk factor exposure to a minimum and to avoid exposure to additional modifiable risks. Further research is needed to establish whether particular combinations of risk factors confer greater risk than others.PROSPERO registration number42016052914.

scholarly journals Representation of Racial and Ethnic Minority Populations in Dementia Prevention Trials: A Systematic Review

2021 ◽  
pp. 1-6
Author(s):  
A.R. Shaw ◽  
J. Perales-Puchalt ◽  
E. Johnson ◽  
P. Espinoza-Kissell ◽  
M. Acosta-Rullan ◽  
...  
Keyword(s):  
Systematic Review ◽  
Phase Iii ◽  
Brain Health ◽  
Dementia Risk ◽  
Dementia Prevention ◽  
Prevention Studies ◽  
Prevention Trials ◽  
Race Ethnicity ◽  
The Impact ◽  
Racial Ethnic

Despite older racial and ethnic minorities (REMs) being more likely to develop dementia they are underrepresented in clinical trials focused on neurological disorders. Inclusion of REMs in dementia prevention studies is vital to reducing the impact of disparities in dementia risk. We conducted a systematic review to characterize the number of REM enrolled in brain health and prevention randomized controlled trials (RCTs). RTCs published from January 1, 2004 to April 21, 2020 were included. Participants were normal cognitive adults aged 45 years and older who participated in a Phase II or Phase III U.S. based preventative trial. Analyses were performed to examine differences in trial characteristics between RCTs that did and those that did not report race/ethnicity and to calculate the pooled proportion of each racial/ethnic group in randomized brain healthy prevention trials. A total of 42 studies consisting of 100,748 participants were included in the final analyses. A total of 26 (62%) reported some racial/ethnic identity data. The pooled proportion of REM participants was 0.256 (95% CI, 0.191, 0.326). There is a lack of racial/ethnic reporting of participants and REMs remain underrepresented in brain health prevention RCTs.

Effects of different antihypertensive medication groups on cognitive function in older patients: A systematic review

2017 ◽  
Vol 46 ◽  
pp. 1-15 ◽  
Author(s):  
M. Stuhec ◽  
J. Keuschler ◽  
J. Serra-Mestres ◽  
M. Isetta
Keyword(s):  
Systematic Review ◽  
Cognitive Function ◽  
Episodic Memory ◽  
Cognitive Decline ◽  
Older Patients ◽  
The Elderly ◽  
Systematic Search ◽  
Chronic Hypertension ◽  
Increased Risk ◽  
The Impact

AbstractBackground:Chronic hypertension has been associated with an increased risk of cognitive decline. Although a link between hypertension and cognitive decline has been established, there is less evidence supported by systematic reviews. The main aim was to compare different antihypertensive drug groups in relation to their effect on cognition in older patients without established dementia using a systematic review.Method:A systematic search in Medline and Embase through to January 2017 was used to identify randomized controlled clinical trials (RCTs) studying the impact of different antihypertensives on cognition in older patients without dementia. Angiotensin II receptor blockers (ARBs), angiotensin-converting enzyme inhibitors (ACE-Is), beta-blockers (BBs), diuretics, and calcium channel blockers (CCBs) were included in this review.Results:The systematic search identified 358 studies. The full text of 31 RCTs was reviewed and a total of 15 RCTs were included in the review. Most studies reported an improvement in episodic memory in patients treated with ARBs versus placebo or other types of antihypertensive drugs. No study showed an improvement in cognition in patients who received diuretics, BBs, or CCBs. Heterogeneity was high in most trials (predominantly in the blinding of participants and investigators).Conclusion:This review suggests that ARBs can improve cognitive functions in the elderly, especially episodic memory. ACE-Is, diuretics, BBs and CCBs did not seem to improve cognitive function in the elderly but were similarly effective in blood pressure lowering as ARBs.

scholarly journals The Role of Nutritional Status on Polypharmacy, Cognition, and Functional Capacity of Institutionalized Elderly: A Systematic Review

Nutrients ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 3477
Author(s):  
Catarina Caçador ◽  
Edite Teixeira-Lemos ◽  
Sofia Oliveira Martins ◽  
Fernando Ramos
Keyword(s):  
Systematic Review ◽  
Nutritional Status ◽  
Cognitive Decline ◽  
Functional Capacity ◽  
Functional Performance ◽  
Functional Decline ◽  
Population Data ◽  
Strong Impact ◽  
Institutionalized Elderly ◽  
The Impact

Adequate nutritional status is necessary for the proper management of polypharmacy, the prevention of cognitive decline, and the maintenance of functional capacity in activities of daily living. Although several studies validate this fact for the general elderly population, data on institutionalized seniors concerning this relation are scarce. A systematic review was performed according to the PRISMA guidelines, aiming to study the potential correlation between nutritional status and polypharmacy, cognitive decline, and functional performance in institutionalized elders. The search was limited to studies in English or Portuguese in the last decade. Inclusion criteria relied on the PICO method. Five studies explored the relationship of nutritional status with cognitive performance in the institutionalized elderly, and nine prospective observational studies reported significant positive associations between appropriate nutritional status and physical abilities. Nutritional status was primarily measured by MNA. Adequate nutritional status was described as an important parameter in preventing cognitive and functional decline in the institutionalized elderly. No studies were found describing the impact of nutritional status on the prevention of polypharmacy. Given the strong impact of malnutrition found in the studies in cognition and functional abilities in the institutionalized elderly, an evaluation of nutritional status of the elders is crucial to prevent health problems and allow early intervention programs in order to further prevent health decline.

scholarly journals Cognitive Trajectories and Dementia Risk: A Comparison of Two Cognitive Reserve Measures

2021 ◽  
Vol 13 ◽  
Author(s):  
Federico Gallo ◽  
Grégoria Kalpouzos ◽  
Erika J. Laukka ◽  
Rui Wang ◽  
Chengxuan Qiu ◽  
...  
Keyword(s):  
Cognitive Decline ◽  
Cognitive Reserve ◽  
Cognitive Change ◽  
National Study ◽  
Residual Variance ◽  
Dementia Risk ◽  
Dementia Incidence ◽  
Integrity Index ◽  
The Impact ◽  
The Brain

Background and ObjectivesCognitive reserve (CR) is meant to account for the mismatch between brain damage and cognitive decline or dementia. Generally, CR has been operationalized using proxy variables indicating exposure to enriching activities (activity-based CR). An alternative approach defines CR as residual variance in cognition, not explained by the brain status (residual-based CR). The aim of this study is to compare activity-based and residual-based CR measures in their association with cognitive trajectories and dementia. Furthermore, we seek to examine if the two measures modify the impact of brain integrity on cognitive trajectories and if they predict dementia incidence independent of brain status.MethodsWe used data on 430 older adults aged 60+ from the Swedish National Study on Aging and Care in Kungsholmen, followed for 12 years. Residual-based reserve was computed from a regression predicting episodic memory with a brain-integrity index incorporating six structural neuroimaging markers (white-matter hyperintensities volume, whole-brain gray matter volume, hippocampal volume, lateral ventricular volume, lacunes, and perivascular spaces), age, and sex. Activity-based reserve incorporated education, work complexity, social network, and leisure activities. Cognition was assessed with a composite of perceptual speed, semantic memory, letter-, and category fluency. Dementia was clinically diagnosed in accordance with DSM-IV criteria. Linear mixed models were used for cognitive change analyses. Interactions tested if reserve measures modified the association between brain-integrity and cognitive change. Cox proportional hazard models, adjusted for brain-integrity index, assessed dementia risk.ResultsBoth reserve measures were associated with cognitive trajectories [β × time (top tertile, ref.: bottom tertile) = 0.013; 95% CI: –0.126, –0.004 (residual-based) and 0.011; 95% CI: –0.001, 0.024, (activity-based)]. Residual-based, but not activity-based reserve mitigated the impact of brain integrity on cognitive decline [β (top tertile × time × brain integrity) = –0.021; 95% CI: –0.043, 0.001] and predicted 12-year dementia incidence, after accounting for the brain-integrity status [HR (top tertile) = 0.23; 95% CI: 0.09, 0.58].InterpretationThe operationalization of reserve based on residual cognitive performance may represent a more direct measure of CR than an activity-based approach. Ultimately, the two models of CR serve largely different aims. Accounting for brain integrity is essential in any model of reserve.

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