Genetic associations with psychosis and affective disturbance in Alzheimer's disease.

INTRODUCTION: Individuals with Alzheimer's disease (AD) commonly experience neuropsychiatric symptoms of psychosis (AD+P) and/or affective disturbance (depression, anxiety, and/or irritability, AD+A). This study's goal was to identify the genetic architecture of AD+P and AD+A, as well as their genetically correlated phenotypes. METHODS: Genome-wide association meta-analysis of 9988 AD participants from six source studies with participants characterized for AD+P AD+A, and a joint phenotype (AD+A+P). RESULTS: AD+P and AD+A were genetically correlated. However, AD+P and AD+A diverged in their genetic correlations with psychiatric phenotypes in individuals without AD. AD+P was negatively genetically correlated with bipolar disorder and positively with depressive symptoms. AD+A was positively correlated with anxiety disorder and more strongly correlated than AD+P with depressive symptoms. AD+P and AD+A+P had significant estimated heritability, whereas AD+A did not. Examination of the loci most strongly associated with the three phenotypes revealed overlapping and unique associations. DISCUSSION: AD+P, AD+A, and AD+A+P have both shared and divergent genetic associations pointing to the importance of incorporating genetic insights into future treatment development. Highlights: It has long been known that psychotic and affective symptoms are often comorbid in individuals diagnosed with Alzheimer's disease. Here we examined for the first time the genetic architecture underlying this clinical observation, determining that psychotic and affective phenotypes in Alzheimer's disease are genetically correlated.Nevertheless, psychotic and affective phenotypes in Alzheimer's disease diverged in their genetic correlations with psychiatric phenotypes assessed in individuals without Alzheimer's disease. Psychosis in Alzheimer's disease was negatively genetically correlated with bipolar disorder and positively with depressive symptoms, whereas the affective phenotypes in Alzheimer's disease were positively correlated with anxiety disorder and more strongly correlated than psychosis with depressive symptoms.Psychosis in Alzheimer's disease, and the joint psychotic and affective phenotype, had significant estimated heritability, whereas the affective in AD did not.Examination of the loci most strongly associated with the psychotic, affective, or joint phenotypes revealed overlapping and unique associations.

The associations between unmet needs with protective factors, risk factors and outcomes among care partners of community-dwelling persons living with dementia.

OBJECTIVES: Describe the prevalence and types of unmet needs among community-dwelling dementia care partners (CPs) and determine associations between unmet needs with protective factors, risk factors and outcomes. METHOD: A cross-sectional analysis of 638 racially and cognitively diverse community-dwelling persons living with dementia (PLWD) and their CPs participating in a comprehensive in-home assessment of dementia-related needs. Unmet CP needs (19 items, 6 domains) were rated by a clinician using the Johns Hopkins Dementia Care Needs Assessment (JHDCNA). Multivariate linear regression models were used to examine associations between total percent unmet CP needs with demographic, protective and risk factors. RESULTS: Nearly all CPs had at least one unmet need (99.53%), with a mean of 5.7 (±2.6). The most common domains with ≥1 unmet need were memory disorder education, care skills and knowledge of resources (98%), legal issues/concerns (73.8%), CP mental health (44.6%) and access to informal support (42.7%). Adjusted multivariate models suggest the strongest consistent predictive factors relate to informal emotional support, CP physical health, use or difficulty getting formal services/supports (both for CPs and PLWD), and CP time spent with PLWD. Greater levels of unmet needs were associated with worse PLWD outcomes and CP outcomes, after adjusting for demographics. CONCLUSIONS: CPs have high rates of diverse, but modifiable unmet needs. Data suggest optimal approaches to dementia care should take a family-centered home-based approach that includes routine CP needs assessment, offer targeted interventions that include both traditional medical supports as well as strategies to increase and leverage informal social networks, and ones that can bridge and coordinate medical with non-medical supports. These findings can be used to inform new approaches to support CPs, improve PLWD and CP outcomes, and target groups most at risk for inequities.

Recruitment of a diverse research cohort in a large metropolitan area for dementia intervention studies.

The human and financial costs of dementia care are growing exponentially. Over five and a half million older Americans are estimated to be living with Alzheimer's disease and related dementia (ADRD). By 2050, this is expected to increase to over 13 million, and persons of color are at the highest risk. Considerable funds have been committed to research to prevent, treat, and care for persons at risk for ADRD. However, enrollment of research participants, particularly those coming from diverse backgrounds, is a perennial challenge and has serious implications. This paper quantitatively details the results of a community-based multi-modal outreach effort to recruit a racially diverse sample for non-pharmacological dementia intervention, including referral and participant sources and yield, total recruitment costs and cost per enrolled dyad, and a qualitative description of lessons learned, with particular attention to the recruitment of Black participants. The largest number of referrals and referrals converting to study participants, for both Black and White persons, were from a Maryland Department of Health mailing to Medicaid recipients. There was an important difference in the most effective strategies, proportionally, for white and Black participants. The MDH mailing had the highest yield for our Black referrals and participants, while professional referrals had the highest yield for white referrals and participants. The total estimated cost of recruitment was $101,058, or $156.19 per enrolled dyad. Ultimately 646 persons with dementia and care partner dyads were enrolled, 323 (50%) of whom were Black.