[Clustering of cognitive domains among older adults with HIV]. / Agrupación de dominios cognitivos en personas mayores con VIH.

Background: Age and HIV are synergistic risk factors for conditions such as HIV-associated neurocognitive disorders (HAND). Yet, it is unclear whether OAWH display different cognitive profiles for HAND. Objective: To describe the cognitive patterns of OAWH treated with combined antiretroviral therapy (cART). Methods: Cross-sectional study that included 330 participants with HIV, aged 50 years or older, cared for at a tertiary care hospital in Mexico City. A short neuropsychological test battery was used to assess a wide spectrum of cognitive functions. The optimal number of cognitive clusters was determined by the silhouette method and a minimization of the Bayesian information criterion. Results: Participants' mean age was 58.8 years (SD = 6.6), and 12.1% were women. A 3-cluster solution yielded stable Jaccard coefficients (p > 0.70). Cluster 1 showed more significant impairment in visual and verbal memory domains, whereas participants in cluster 3 showed significant impairment in language, and abstraction. Cluster 2 showed no predominance of any domain for alterations. Conclusions: There are different cognitive profiles among OAWH with HAND. These differences may be due to individual patterns of HIV-related and non-HIV-related factors.

Antecedentes: La edad y el VIH constituyen factores de riesgo sinérgicos de afecciones como los trastornos neurocognitivos asociados al VIH (TNAV). No se ha esclarecido si las personas mayores con VIH presentan perfiles cognitivos diferentes en caso de padecer TNAV. Objetivo: Describir los patrones cognitivos de adultos mayores con VIH tratados con terapia antirretroviral combinada (TARc). Métodos: Estudio transversal que incluyó a 330 participantes con VIH, de 50 años o más, atendidos en un centro hospitalario de tercer nivel en la Ciudad de México. Se utilizó una batería neuropsicológica corta estandarizada a fin de evaluar un amplio espectro de funciones cognitivas. Se determinó el número óptimo de grupos de dominios cognitivos a partir del método de la silueta y minimización del criterio de información bayesiano. Resultados: La edad promedio de los participantes fue de 58.8 años; las mujeres constituyeron 12.1 %. Una solución de tres grupos produjo coeficientes de Jaccard estables (p > 0.70). El grupo 1 mostró deterioro más significativo en la memoria visual y verbal, en tanto que el grupo 3 mostró deterioro significativo en el lenguaje y la abstracción. En el grupo 2 no se registró predominio de ningún dominio en cuanto a alteraciones. Conclusiones: Existen perfiles cognitivos diferentes entre las personas mayores con VIH y TNAV. Estas diferencias pueden deberse a patrones individuales de factores relacionados o no con el VIH.

Psychometric properties of the Perceived Social Support Questionnaire (PSSQ), a new measure of perceived social support among older adults.

OBJECTIVE: Based on literature and available questionnaires, the present study aimed at creating and validating the Perceived Social Support Questionnaire (PSSQ): a 4-item scale assessing the perceived social support in older adults. Normative scores were also computed. METHODS: Three hundred and two participants (mean age 87.68) selected from ongoing population-based studies completed a phone interview. Among these, 247 completed a second interview 4 months later allowing assessing the questionnaire fidelity over time. RESULTS: The factor analysis evidenced two dimensions: availability of social support and satisfaction with it. Both dimensions had a satisfactory internal consistency but weak intraclass correlation coefficient. Univariate analyses revealed that age, number of calls per week and living environment marginally associated with the availability score. The satisfaction score was associated with perceived health status, sadness, depressive mood, feeling of loneliness, anxiety, and the perception of social support during the pandemic context. The norms computed were stratified on age. CONCLUSIONS: The PSSQ is a short and easy-to-administer tool allowing assessing perceived social support in older population. Despite a weak fidelity that could actually be explained by changes in perceived social support over time, the questionnaire revealed good psychometric qualities and validity.

Depression in Older Adults: Do Current DSM Diagnostic Criteria Really Fit?

OBJECTIVES: The great heterogeneity in symptoms and clinical signs of depression in older adults makes the current diagnostic criteria difficult to apply. This scoping review aims to provide an update on the relevance of each of the diagnostic criteria as defined in the DSM-5. METHODS: In order to limit the risk of bias inherent in the study selection process, a priori inclusion and exclusion criteria were defined. Articles meeting these criteria were identified using a combination of search terms entered into PubMed, PsycINFO, PsycARTICLES and SocINDEX. RESULTS: Of the 894 articles identified, 33 articles were selected. This review highlights a different presentation of depression in older adults. Beyond the first two DSM core criteria, some symptoms are more common in older adults: appetite change, sleep disturbance, psychomotor slowing, difficulty concentrating, indecisiveness, and fatigue. CONCLUSIONS: This review provides an updated description of the clinical expression of depressive symptoms in the older population while highlighting current pending issues. CLINICAL IMPLICATIONS: Somatic symptoms should be systematically considered in order to improve the diagnosis of depression in older adults, even if, in some cases, they may reflect symptoms of age-related illnesses.

Longitudinal Study of Cognitive Decline before and after the COVID-19 Pandemic: Evidence from the PA-COVID Survey.

INTRODUCTION: Even though several studies reported good resilience capacities in older adults in the first period of the coronavirus disease 2019 (COVID-19) pandemic, in the long run, social isolation induced by the protective measures adopted by most countries may negatively impact cognitive functioning. Taking the advantage of measures collected up to 15 years before the pandemic in participants followed up in epidemiological studies, we compared cognitive decline before and after the start of the pandemic. METHODS: PA-COVID is a phone survey designed in the framework of ongoing population-based studies (PAQUID, 3-City, Approche Multidisciplinaire Intégrée cohorts). Data on social functioning and mental health were collected in participants aged 80 years and older during the pandemic. Prior to the pandemic, the participants followed up in the prospective studies completed the Mini-Mental State Examination. During the PA-COVID survey, they underwent the Telephone Interview for Cognitive Status. A score was computed with the 11 items shared by the 2 tests. Our analysis was carried out in the participants for whom a cognitive measure was available up to 15 years before the pandemic and during the pandemic (n = 263). RESULTS: Compared to the slow decline of the cognitive subscore observed during the 15 years preceding the pandemic, mixed models showed an acceleration of decline after the start of the pandemic (ß = -0.289, p value <0.001). CONCLUSIONS: With a design allowing comparing cognitive trajectory before and after the pandemic, this is the first study reporting an accelerated decline in older adults. Future COVID research in older adults will need to pay special attention to cognitive outcomes.

Trajectory of Quality of Life Before and After Entering a Nursing Home: A Longitudinal Study.

OBJECTIVES: The objective of this longitudinal study was to compare the trajectory of subjective quality of life in 2 groups of older adults: those who entered a nursing home and those who remained living in the community with similar clinical conditions. METHOD: PAQUID is a prospective population-based study. It included, at baseline, 3777 community-dwelling participants aged 65 years and over. Participants were followed-up for up to 27 years. Among people living at home at baseline, 2 groups were compared: participants who entered a nursing home over a 20-year follow-up (n = 528) and those who remained community dwellers (n = 2273). We used latent process mixed models to estimate the relationship between mean trajectory of subjective quality of life and admission into a nursing home. We computed univariate and multivariate models taking into account potential confounders (age, gender, education, income, comorbidities, dementia, disability and depression). RESULTS: Nursing home placement was significantly associated with a drop in quality of life between the last visit before and after institutionalization. Nevertheless, we found no difference in quality of life trajectory after this initial drop. CONCLUSION: Older adults exhibit an acute drop in quality of life after nursing home admission, probably reflecting the associated psychological distress. Even though their quality of life does not go back to pre-admission levels, the residents do not show a steeper decline when compared to the "natural" evolution of quality of life in older adults living in the community, which suggests a relative adaptation to their new living conditions.

Chronic pain and long-term dementia risk in older adults: Results from a 24-year longitudinal study.

INTRODUCTION: Chronic pain (CP) was associated with cognitive impairment in previous studies. However, the longitudinal association between CP and dementia remains under debate. We aimed to assess the prospective link between CP and long-term dementia risk in a population-based cohort of older participants, considering covariables linked to CP and cognitive functioning. METHODS: The study sample was selected from the PAQUID study, an ongoing cohort of older community-dwellers aged 65 years and over at baseline; Information regarding CP and analgesics consumption was collected using questionnaires. Dementia was clinically assessed every 2 years. The population was divided into 4 groups according to CP and analgesic drugs intake (CP+/A+, CP+/A-, CP-/A+, CP-/A-). An illness-death model was used to estimate the link between CP and incident dementia risk controlled for sex, educational level, comorbidities, depression, antidepressant drugs and analgesics. RESULTS: Five hundred ninety three participants (364 women) who completed a CP questionnaire, were included. They were followed-up over 24 years (mean follow-up: 11.3 years, SD 7.3). A total of 223 participants (32.5%) had CP, among them 88 (38.6%) took analgesic drugs. Compared to CP-/A- group, CP+/A+ participants had a higher risk of developing dementia in the univariate model (hazard ratio (HR) = 1.73, 95%CI:1.18-2.56; p = 0.0051). However, these results did not persist in the multivariate models (aHR = 1.23, 95%CI:0.88-1.73; p = 0.23). No significant risk for dementia were observed in CP-/A+ and CP+/A- (HR = 1.30, 95%CI:0.84-2.01; p = 0.23 and HR = 1.36, 95%CI:0.95-1.96; p = 0.09, respectively). CONCLUSION: Our results failed to show a significant relationship between the presence of CP and long-term dementia risk, suggesting that the cognitive decline associated with CP observed in the literature does not appear to be related to Alzheimer's disease or related disorders.

Routinization: risk factor or marker of adjustment to negative health issues?

OBJECTIVES: Routinization reflects how older people cope with the health problems. It remains to be seen whether it should be considered as a risk factor of negative health outcomes, or rather, a mechanism of adjustment to health issues: mortality, institutionalization, dementia, disability, cognitive decline, depression and subjective health. METHODS: From longitudinal data of two large-scale French epidemiological studies, the study sample consists of 961 participants aged 77 years on average, living at home and with no neurocognitive disorder. The relationship between the level of routines measured by the Preferences for Routines Scale-Short form and the adverse health outcomes are studied considering the level of routines at baseline and in time-dependent using Cox proportional hazards models and Latent process mixed models. RESULTS: After adjustment for sociodemographic variables, the routinization score at baseline is not associated with any health outcomes while the routinization score as a time-dependent variable is significantly associated with an increased risk of dementia (hazard ratios (HR) = 1.08, 95% confidence intervals (CI) = 1.02-1.15, p = 0.016) and institutionalization (HR = 1.18, 95% CI = 1.03-1.36, p = 0.019), greater global cognitive decline (ß = -0.02, p = 0.001) and depressive symptoms (ß = 0.02, p = 0.023) and a decrease in subjective health (ß = 0.02, p = 0.008). CONCLUSIONS: The level of routines measured at a given time is not associated with long-term prediction of negative health outcomes, while in time-dependent, it reveals to be a significant predictor. It should be seen as a marker of adjustment process.

Towards an approach of disability along a continuum from robustness, pre-frailty, frailty to disability.

BACKGROUND: frailty and disability are very prevalent in older age and although both are distinct clinical entities, they are commonly used indistinctly in order to identify vulnerable older adults. OBJECTIVE: to propose a hierarchical indicator between frailty and disability among older adults along a single continuum. DESIGN: population-based cohort study. SETTING: the Bordeaux Three-City Study and the Aging Multidisciplinary Investigation (AMI) cohort. SUBJECTS: the sample included 1800 participants aged 65 and older. METHODS: an additive hierarchical indicator was proposed by combining the phenotype of frailty (robustness, pre-frailty and frailty), instrumental activities of daily living (IADL) and basic activities of daily living (ADL). To test the relevance of this indicator, we estimated the 4-year mortality risk associated with each stage of the indicator. RESULTS: in total, 34.0% were Robust (n = 612), 29.9% were Pre-frail (n = 538), 3.2% were Robust with IADL-disability (n = 58), 4.6% had pure Frailty (no disability) (n = 82), 11.9% were Pre-frail + IADL (n = 215), 8.6% were Frail + IADL (n = 154) and 7.8% Frail + IADL + ADL (n = 141). After grouping grades with similar mortality risks, we obtained a five-grade hierarchical indicator ranging from robustness to severe stage of the continuum. Each state presented a gradually increasing risk of dying compared to the robust group (from Hazard Ratio (HR) = 2.20 [1.49-3.25] to 15.10 [9.99-22.82]). CONCLUSIONS: We confirmed that combining pre-frailty, frailty, IADL- and ADL-disability into a single indicator may improve our understanding of the aging process. Pre-frailty identified as the 'entry door' into the process may represent a key stage that could offer new opportunities for early, targeted, individualized and tailored interventions and care in clinical geriatrics.

Infectious diseases and cognition: do we have to worry?

OBJECTIVES: Age-related physiological changes, particularly immune system decline, may contribute to greater vulnerability to infectious diseases in older individuals. A growing body of evidence shows that both, acute, and chronic infections may be accompanied by cognitive disturbances as part of their manifestations. Given the importance of cognition in aging trajectories, the objective of this article was to review current knowledge on cognitive outcomes of infectious diseases in older adults, and to emphasize the importance of considering cognition as a domain of interest in its own rights in these diseases. METHODS: A MEDLINE/PubMed database search was conducted to identify articles reporting cognitive impairment associated with various severe acute infections and specific chronic infectious conditions such as human immune deficiency virus, the herpes virus family, hepatitis C virus, Lyme borreliosis, Helicobacter pylori, periodontitis, and emerging pathogens like SARS-CoV-2, as well as potentially preventive strategies like vaccination. RESULTS/ CONCLUSIONS: Taken together, the studies examined in the present review emphasize that numerous acute and chronic infectious diseases share mechanisms that, when added to specific risk factors frequently found in older persons, contribute to considerably increase the risk of cognitive outcomes such as cognitive decline and dementia. This review may help to appreciate the role that infectious diseases play in cognitive trajectories and thus promote further investigation on the topic.

Cognitive decline as an outcome and marker of progression toward dementia, in early preventive trials.

INTRODUCTION: Recent Food and Drug Administration guidance endorses cognitive assessment as a possible primary endpoint for early trials for Alzheimer's disease but emphasizes the need for certainty regarding the relationship with progression to dementia. METHODS: We compared the validity of the 2-year change (Y0-Y2) of 11 markers of neuropsychological and functional abilities for the prediction of incident dementia over the following 3 years (Y2-Y5), in 860 subjects aged 70 years or older, who consulted for memory loss and were included in the "GuidAge" prevention trial. RESULTS: The Free and Cued Selective Reminding Test-Free Recall (FCSRT-FR) score showed the most predictive 2-year change (area under the curve = 0.72 95% confidence interval = 0.64;0.81). Changes in other subscores of the FCSRT, verbal fluencies tasks, and composite cognitive score were also significantly predictive. Conversely, 2-year change of Mini-Mental State Examination, Trail Making test (TMT)-A, TMT-B, Clinical Dementia Rating Sum of Boxes, and Instrumental Activities of Daily Living scores did not significantly predict occurrence of dementia. CONCLUSION: The FCSRT, the Fluency Task, and the composite cognitive score appear to be good cognitive markers of progression toward dementia in early prevention trials.

Distinct Hippocampal Subfields Atrophy in Older People With Vascular Brain Injuries.

BACKGROUND AND PURPOSE: Many neurological or psychiatric diseases affect the hippocampus during aging. The study of hippocampal regional vulnerability may provide important insights into the pathophysiological mechanisms underlying these processes; however, little is known about the specific impact of vascular brain damage on hippocampal subfields atrophy. METHODS: To analyze the effect of vascular injuries independently of other pathological conditions, we studied a population-based cohort of nondemented older adults, after the exclusion of people who were diagnosed with neurodegenerative diseases during the 14-year clinical follow-up period. Using an automated segmentation pipeline, 1.5T-magnetic resonance imaging at inclusion and 4 years later were assessed to measure both white matter hyperintensities and hippocampal subfields volume. Annualized rates of white matter hyperintensity progression and annualized rates of hippocampal subfields atrophy were then estimated in each participant. RESULTS: We included 249 participants in our analyses (58% women, mean age 71.8, median Mini-Mental State Evaluation 29). The volume of the subiculum at baseline was the only hippocampal subfield volume associated with total, deep/subcortical, and periventricular white matter hyperintensity volumes, independently of demographic variables and vascular risk factors (ß=-0.17, P=0.011; ß=-0.25, P=0.020 and ß=-0.14, P=0.029, respectively). In longitudinal measures, the annualized rate of subiculum atrophy was significantly higher in people with the highest rate of deep/subcortical white matter hyperintensity progression, independently of confounding factors (ß=-0.32, P=0.014). CONCLUSIONS: These cross-sectional and longitudinal findings highlight the links between vascular brain injuries and a differential vulnerability of the subiculum within the hippocampal loop, unbiased of the effect of neurodegenerative diseases, and particularly when vascular injuries affect deep/subcortical structures.

Living in rural area: A protective factor for a negative experience of the lockdown and the COVID-19 crisis in the oldest old population?

OBJECTIVES: Some factors influence the experience of the COVID-19 pandemic (health, loneliness, digital access...), but what about the living area? The objective was to compare between rural and urban areas, the psychological and social experiences of the older individuals with regard to the COVID-19 crisis during the first French lockdown. METHODS: The sample included participants of three existing population-based cohorts on aging. Telephone interviews conducted by psychologists focused on the lockdown period. Data collected included living environment, professional assistance, social support, contacts with relatives, difficulties encountered, health, and knowledge and representations of the epidemic. The negative experience was defined by the presence of at least two of the following items: high anxiety symptomatology, depressive symptoms, worries or difficulties during the lockdown and insufficient social support. RESULTS: The sample included 467 participants, aged on average 87.5 years (5.2), 58.9% were female and 47.1% lived in rural areas. Persons living in rural area had better social support, greater family presence, a less frequent feeling of imprisonment (OR = 0.60, 95 CI% = 0.36-0.99), 95% had a garden (vs. 56%), fewer depressive symptoms and lower anxiety scores, but also tended to lower comply with the health measures. Finally, they had an almost twofold lower risk of having a negative experience of the lockdown compared to their urban counterparts (OR = 0.55, 95% CI = 0.33-0.92, p = 0.0223). CONCLUSIONS: The oldest old living in rural area experienced the first lockdown better than the urbans. Living conditions, with access to nature, a greater social support and family presence, could have contributed to these findings.

Validation of Short Form of Preferences for Routines Scale: Norms in Older Adults.

High level of preferences for routines is an indicator of psychological vulnerability in older adults. However, the psychometric properties of the Preferences for Routines Scale (PRS) initially validated in a small selected sample of older adults revealed a low Cronbach's α (.50) in the general elderly population. The present study aims to improve the PRS using the data from the "AMI" and "PAQUID" population-based studies. Among 718 older persons, the most discriminative items are identified using item response theory methodology. A short form of the PRS (PRS-S) included five of the ten items of the original scale and showed improved internal consistency and test-retest reliability. The factors associated with the PRS-S are similar to those found in previous studies. Norms are provided according to gender and educational level. The reduction of the number of items tends to facilitate its administration and promote its use in both clinical and epidemiologic research contexts.

The disability process: is there a place for frailty?

BACKGROUND: frailty and disability are very common in older adults; they share some risk factors and pathophysiological mechanisms. Yet, they are different clinical entities. OBJECTIVES: this study aimed to explore a potential hierarchical relationship between frailty and disability along the continuum of the disablement process. DESIGN: prospective cohort study. SETTING: the French Three-City (3C) study. SUBJECTS: the sample included 943 participants aged 75 and older. METHODS: the Fried frailty phenotype, Instrumental Activities of Daily Living (IADL) and basic Activities of Daily Living (ADL) were used. We distinguished between four mutually excluding groups: (i) robust (no frailty and no disability); (ii) pure frailty (no disability); (iii) frailty with IADL disability (no ADL disability) and (iv) frailty with IADL and ADL disabilities. We used Cox's regression models to study the 4-year mortality risk associated with each status. RESULTS: Eight-two per cent of participants were classified according to the assumed hierarchy: 61.3% was robust, 5.4% frail, 10.5% frail and IADL-disabled and 4.8% frail, IADL and ADL-disabled. An extra group of 17% was identified with IADL-disabled individuals without frailty. This extra group was similar to pure frailty in terms of characteristics and risk of death, placing them along the continuum at an intermediate stage between robustness and the two most disabled sub-groups. CONCLUSIONS: our findings suggest that including frailty along the continuum could be relevant to describe the whole disablement process. Frailty would occur upstream of the process and might be relevant to identify an opportune time window, where specific monitoring and clinical interventions could be implemented in order to interrupt the process at a potentially more reversible stage.

Influence of pre-admission factors on quality of life and adaptation in nursing home residents with dementia: the QOL-EHPAD study protocol.

BACKGROUND: In 2015 in France, 585,560 people were nursing home residents. A large body of studies has identified predictors of poor quality of life and poor adaptation in institution, mostly for residents without dementia. With 42 to 72% of these residents diagnosed with dementia, it is crucial to identify what factors prior to admission might have an impact on quality of life once the admission is finalized, in order to target specific domains of intervention, while the person still lives at home and after his/her admission. METHODS: QOL-EHPAD is a prospective, multi-centred, observational cohort study. At baseline, we will collect retrospective data on the life of 150 persons with dementia and their caregivers. These data will refer to the conditions of admission to a nursing home (emergency admission, involvement in the decision, admission from home or from the hospital) and to the 6 months prior to the admission of the person with dementia: sociodemographic and medical data, psychological tests, information on quality of life, satisfaction, behaviour, and nutrition. Similar data about life in the nursing home will be collected after 6 months, along with information on adaptation of the person with dementia to his/her new living environment. We will use univariate regression analyses followed by stepwise linear regression models to identify which factors pertaining to life at home are associated with quality of life and adaptation after 6 months. DISCUSSION: This study will provide data on the impact of institutionalization on quality of life and the determinants of a successful institutionalization in people with dementia. This could be helpful in setting up targeted interventions to prepare admission into a nursing home before the actual admission and to accompany both the caregiver and the person with dementia throughout this process.

A hypothesis testing procedure for random changepoint mixed models.

In biomedical research, random changepoint mixed models are used to take into account an individual breakpoint in a biomarker trajectory. This may be observed in the cognitive decline measured by psychometric tests in the prediagnosis phase of Alzheimer's disease. The existence, intensity and duration of this accelerated decline can depend on individual characteristics. The main objective of our work is to propose inferential methods to assess the existence of this phase of accelerated decline, ie, the existence of a random changepoint. To do so, we use a mixed model with two linear phases and test the nullity of the parameter measuring the difference of slopes between the two phases. Because we face the issue of nuisance parameters being unidentifiable under the null hypothesis, the supremum of the classic score test statistic on these parameters is used. The asymptotic distribution of the supremum under the null is approached with a perturbation method based on the multiplier bootstrap. The performance of our testing procedure is assessed via simulations and the test is applied to the French cohort PAQUID of elderly subjects to study the shape of the prediagnosis decline according to educational level. The test is significant for both educational levels and the estimated trajectories confirmed that educational level is a good marker for cognitive reserve.

Is Low Psychomotor Speed a Marker of Brain Vulnerability in Late Life? Digit Symbol Substitution Test in the Prediction of Alzheimer, Parkinson, Stroke, Disability, and Depression.

BACKGROUND: Dementia, stroke, depression, and disability are frequent in late life and are major causes of quality of life disruption and family burden. Even though each of these disorders relies on specific pathogenic processes, a common clinical manifestation is psychomotor slowing. OBJECTIVE: We assessed the relevance of a simple marker of low psychomotor speed in predicting several brain outcomes: dementia, Alzheimer's disease (AD), Parkinson's disease (PD), stroke, depressive symptoms, and disability in activities of daily living (ADL) and instrumental ADL (IADL). METHODS: PAQUID is a population-based study involving 3,777 individuals aged 65 or older prospectively followed-up with repeated clinical evaluations. After 10 years, 437 participants developed dementia, 333 developed AD, 71 developed PD, 207 reported incident stroke, 404 developed disability in ADL, 994 in IADL, and 494 developed depressive symptomology. Psychomotor speed was measured with the digit symbol substitution test (DSST). Cox proportional hazards models controlled for several confounders assessed the risk of incident outcomes. RESULTS: Participants with low DSST performance had increased risk of incident all-type dementia (hazard ratio [HR] 3.41, p < 0.0001) and AD-type dementia (HR 3.18, p < 0.0001). Higher risk for PD (HR 2.98, p = 0.04), IADL (HR 1.82, p < 0.0001), ADL disability (HR 1.95, p = 0.001), depressive symptoms (HR 1.53, p = 0.03), and a statistical trend for stroke (HR 1.88, p = 0.09) was also found. CONCLUSION: Low psychomotor speed is associated with an increased risk of developing various brain outcomes: dementia, AD, PD, disability, depressive symptoms, and marginally stroke. Low psychomotor speed may be the consequence of a number of discrete cerebral abnormalities and could be considered as a marker of brain vulnerability. In clinical practice, a low score in DSST should be seen as a warning sign of possible negative evolution.

Vision loss and 12-year risk of dementia in older adults: the 3C cohort study.

To analyze the longitudinal relationships between vision loss and the risk of dementia in the first 2 years, from 2 to 4 years and beyond 4 years after inclusion and to determine the roles of depressive symptomatology and engagement in cognitively stimulating activities in these associations. This study is based on the Three-City (3C) study, a population-based cohort of 7736 initially dementia-free participants aged 65 years and over with 12 years of follow-up. Near visual impairment (VI) was measured and distance visual function (VF) loss was self-reported. Dementia was diagnosed and screened over the 12-year period. At baseline, 8.7% had mild near VI, 4.2% had moderate to severe near VI, and 5.3% had distance VF loss. Among the 882 dementia cases diagnosed over the 12-year follow-up period, 140 cases occurred in the first 2 years, 149 from 2 to 4 years and 593 beyond 4 years after inclusion. In Cox multivariate analysis, moderate to severe near VI was associated with an increased risk of dementia in the first 2 years (HR 2.0, 95% CI 1.2-3.3) and from 2 to 4 years (HR 1.8, 95% CI 1.1-3.1) but the association was not significant beyond 4 years after inclusion even if pointing in similar direction (HR 1.3, 95% CI 0.95-1.9). Mild near VI was associated with an increased risk of dementia only in the first 2 years (HR 1.6, 95% CI 1.1-2.5). Moreover, self-reported distance VF loss was associated with an increased risk beyond 4 years after inclusion (HR 1.5, 95% CI 1.1-2.0) but the association was no longer significant after taking into account baseline cognitive performances. Further adjustment for engagement in cognitively stimulating activities only slightly decreased these associations. However, there was an interaction between vision loss and depressive symptomatology, with vision loss associated with dementia only among participants with depressive symptomatology. These results suggest that poor vision, in particular near vision loss, may represent an indicator of dementia risk at short and middle-term, mostly in depressed elderly people.

A comprehensive approach of the determinants of use of care in dementia: the Recaredem (recourse to care in dementia) cross-sectional study.

BACKGROUND: Given the rate of the undiagnosed cases of dementia and the consequences of inappropriate care, understanding the factors that explain the use of medical and health care in dementia is a critical concern. Our objective was to identify the psychosocial and medical determinants of use of care in dementia. METHODS: The study sample consisted of 308 participants: the persons with dementia (n = 99) selected from three French population-based cohorts (i.e. PAQUID, 3C, AMI), their family caregivers (primary, n = 96, and secondary, n = 51), and their general practitioners (n = 62). Use of care in dementia was considered according to two indicators: (1) recourse to secondary care, (2) number of community and health services used. RESULTS: Multiple logistic models including sociodemographics and psychosocial variables revealed that the determinants of nonuse of care are similar both for the recourse to secondary care and for the number of community and health services used: lack of education and the contribution of the people with dementia to the decisions regarding their own care and dementia care services in the community area. In addition, satisfaction of the primary caregiver with the services used by his/her relative is associated with non-recourse to secondary care. CONCLUSIONS: Taken together, these results highlight the predominant role of psychosocial factors in the use of care in dementia and the importance of addressing this issue through an integrative approach including psychological, social, medical, and family dimensions.

Temporal Trends in the Level and Decline of Cognition and Disability in an Elderly Population: The PAQUID Study.

In line with declining trends in dementia incidence, we compared the cognitive and functional evolution of 2 "generations" of elderly individuals aged 78-88 years, who were included 10 years apart in the French Personnes Agées Quid cohort (n = 612 in 1991-1992 and n = 628 in 2001-2002) and followed-up for 12 years with assessments of cognition and disability. The impact of specific risk factors on this evolution was evaluated. Differences between the generations in baseline levels and decline over time were estimated using a joint model to account for differential attrition. Compared with the first generation, the second generation had higher performances at baseline on 4 cognitive tests (from P < 0.005). Differences in global cognition, verbal fluency, and processing speed, but not in working memory, were mostly explained by improvement in educational level. The second generation also exhibited less cognitive decline in verbal fluency and working memory. Progression of disability was less over the follow-up period for the second generation than for the first. The cognitive state of this elderly population improved, partially due to improvements in educational level.