Psychosocial Resources as Moderators of the Impact of Spousal Dementia Caregiving on Depression

This study examines the relationship of personal mastery and perceived emotional support to depressive symptoms for spousal dementia caregivers (CGs) and noncaregiver (NCG) spouses. Although it is well known that caring for a spouse with dementia is stressful and that personal mastery and emotional support may reduce stress, the authors hypothesize that these resources are more important for reducing stress in the difficult situation of dementia care than in everyday life for older persons. In bivariate comparisons, CG levels of perceived support and mastery were lower and depression was higher than for NCGs. Consistent with prior research, a hierarchical multiple regression with combined data shows that CG status was a significant predictor of depressive symptoms. A significant interaction of CG status with personal mastery indicates greater impact of mastery on depression among CGs than among NCGs. This unique finding strongly supports interventions focusing on enhancement of mastery among spousal CGs.

Quality of in-home care, long-term care placement, and the survival of persons with dementia

PURPOSE OF THE STUDY

Caregivers of persons with dementia living at home adopt a variety of caregiving styles that vary in quality. Three styles of high-quality care and poor-quality care have been identified. The outcomes, however, of varying styles of caregiving are unknown. Our purpose was to investigate the linkage of quality of care to long-term care placement and survival.

DESIGN AND METHODS

We used a sample of 148 primary caregivers of a relative living at home and needing assistance due to memory or thinking problems. We used items from four existing scales and five new items to construct measures of high-quality and poor-quality care. Long-term care and survival were determined from two follow-ups. Cox proportional hazards regression was used to estimate the relationship of quality of care to long-term care placement and survival.

RESULTS

Poor quality of care increased the risk of long-term care placement, as expected, but high-quality care was not related to placement. Surprisingly, high-quality care increased the risk of death while poor-quality care decreased the risk. Secondary results were: wishful/intrapsychic coping (a dysfunctional type of emotion-focused coping) and long-term care placement shortened the survival; and caregiver personality traits of neuroticism and agreeableness lengthened the survival.

IMPLICATIONS

It is premature to recommend caregiver interventions based on our unexpected findings. Further studies are vital and should include care-recipient impairments and the quality of life of the person with dementia as additional outcomes.

Quality of informal care for persons with dementia: dimensions and correlates

OBJECTIVES

The majority of persons with dementia live in the community where most of their care is provided by family members. We aimed to expand our limited knowledge about the styles of high-quality care, such as person-centered care, and poor-quality care adopted by these informal caregivers and the characteristics of those who provide better care.

METHOD

We conducted a mail survey of 148 family caregivers. Caregiving styles were measured with items from existing scales that had not been analyzed together before. Factor analysis of these items was used to identify styles of caregiving, and structural equation modeling was used to identify their relationships with caregiver and care-recipient characteristics.

RESULTS

Three high quality-of-care factors (personalized, respectful, and compensatory) and three poor quality-of-care factors (punitive, controlling, and withdrawing) were found. The personality traits of agreeableness, openness, conscientiousness, and neuroticism were related to higher quality of care, and the trait of extraversion was related to poorer quality of care. Wishful coping - an avoidance/escape strategy - was linked to poorer quality of care.

CONCLUSION

We discovered new dimensions of quality of care, some consistent with person-centered care and some antithetical to this model, and we identified for the first time caregiver personality traits and coping strategies associated with better quality of care. These results may be useful in targeting caregiver interventions to benefit both caregivers and care recipients.

A randomized pilot clinical trial of the safety of pioglitazone in treatment of patients with Alzheimer disease

OBJECTIVES

To evaluate the safety of the peroxisome proliferator-activated receptor gamma agonist pioglitazone in nondiabetic patients with Alzheimer disease (AD) and to explore treatment effect sizes on clinical outcomes.

DESIGN

Double-blind, placebo-controlled randomized controlled trial of 18-month duration.

SETTING

Two academic medical center outpatient clinics.

PATIENTS

Nondiabetic patients meeting research criteria for probable AD were enrolled. Twenty-five of 29 subjects completed the study; no withdrawals were attributable to adverse effects.

INTERVENTION

Subjects received pioglitazone (Actos), titrated to 45 mg daily, or matching placebo, and 200 IU of vitamin E daily. Patients maintained treatment with cholinesterase inhibitors and could begin memantine therapy when it became available during the study.

MAIN OUTCOME MEASURES

The primary outcome was frequency of reported adverse effects (AEs). Secondary outcomes were measures of cognition, activities of daily living, neuropsychiatric symptoms, and global function.

RESULTS

Peripheral edema was the principal AE occurring more frequently in subjects taking pioglitazone than placebo (28.6% vs 0%). This is consistent with the known AE profile of pioglitazone. No group differences in laboratory measures were identified. No significant treatment effect was observed on exploratory analysis of clinical efficacy.

CONCLUSIONS

Pioglitazone was generally well tolerated in this pilot study. There were no serious or unanticipated adverse events or clinical laboratory changes attributable to pioglitazone over a long-term exposure in nondiabetic patients with AD. The tolerability of pioglitazone in this population and peroxisome proliferator-activated receptor gamma effects in laboratory models of AD support further study of this drug class in earlier disease stages.

TRIAL REGISTRATION

clinicaltrials.gov Identifier: NCT00982202.

Pharmacological treatment of Alzheimer's disease: effect of race and demographic variables

Existing research shows differences in medication use for Alzheimer's disease (AD) based on demographics such as race, ethnicity, and geographical location. To determine individual and community characteristics associated with differences in acetylcholinesterase inhibitor (AChEI) and memantine use in AD, 3,049 AD subjects were drawn from 30 centers and evaluated using the Uniform data set (UDS). Cases were evaluated at the individual level within the context of 31 communities (one center encompassed two separate geographical regions). Multivariate analysis was used to determine the significance of individual variables on medication use. Compared to non-Hispanic Whites, Blacks were less likely to use AChEI and memantine with odds ratios (OR) of 0.59 (95% CI 0.46-0.76) and 0.43 (95% CI 0.32-0.57), respectively. Compared to non-Hispanic Whites, non-Black Hispanics were less likely to use memantine (OR=0.69 (95% CI 0.49-0.98)). No association was found between the proportion of Blacks or non-Black Hispanics versus non-Hispanic Whites at an Alzheimer Disease Center and individual use of AChEI or memantine. Other significant variables include gender, age, marital status, dementia severity, source of referral, AChEI use, and education. Education and age somewhat mitigated disparity. Significant racial and ethnic differences in AChEI and memantine use exist at the individual level regardless of the racial and ethnic composition of the individual's community. Research and initiatives at the societal level may be an important consideration toward addressing these differences.

Memantine and acetylcholinesterase inhibitor treatment in cases of CDR 0.5 or questionable impairment

The biological meaning of uncertain dementia ratings (CDR 0.5) and its treatment implications are unclear. Our study examines the frequency of anti-dementia medication use in individuals with CDR 0.5 and the cognitive, behavioral, and demographic factors associated with memantine and acetylcholinesterase inhibitor (AChEI) use. Subjects were drawn from the National Alzheimer Coordinating Center database, which collects data from 30 Alzheimer Disease Centers. There were 2,512 subjects with the following diagnoses: Normal, 11.8%; Mild cognitive impairment, 44.6%; Alzheimer's disease, 34.9%; and other dementias, 8.7%. Overall, 35% used AChEIs and 13% used memantine. AChEI and memantine use was greater in subjects who were referred by clinics and diagnosed with Alzheimer's disease. AChEI use was associated with being married, younger, male, and more educated while memantine use was associated with less severe apathy and other dementia diagnosis. Non-Hispanic whites were more likely to use AChEI and memantine than non-Hispanic blacks (OR = 2.2, 2.5). Hispanics were more likely to use AChEI than non-Hispanic blacks. It appears anti-dementia medication use in CDR 0.5 is frequent and represents evidence for extensive off label usage. Diagnosis, severity of impairment, and race, among other variables, affect the likelihood of AChEI and memantine use in this population.

Cognitive functioning in healthy aging: the role of reserve and lifestyle factors early in life

PURPOSE

According to the reserve perspective on cognitive aging, individuals are born with or can develop resources that help them resist normal and disease-related cognitive changes that occur in aging. The reserve perspective is becoming more sophisticated, but gaps in knowledge persist. In the present research, we considered three understudied questions about reserve: Is reserve primarily static (unchangeable) throughout the life course or dynamic (changeable, in terms of increases or decreases)? Can reserve be increased at any point in life, or are there optimal time periods--such as early life, midlife, or late life--to increase it? Does participation in different types of leisure and occupational activities in early life and midlife have different effects depending on specific domains of late-life cognitive functioning? Here we link early cognitive and activity data--gathered from archival sources--with cognitive data from older adults to examine these issues.

DESIGN AND METHODS

349 participants, all mid-1940s graduates of the same high school, underwent telephone cognitive screening. All participants provided access to adolescent IQ scores; we determined activity levels from yearbooks. We used path analysis to evaluate the complex relationships between early life, midlife, and late-life variables.

RESULTS

Adolescent IQ had strong direct effects on global cognitive functioning, episodic memory, verbal fluency, and processing speed. Participants' high school mental activities had direct effects on verbal fluency, but physical and social activities did not predict any cognitive measure. Education had direct effects on global cognitive functioning, episodic memory, and, most strongly, processing speed, but other midlife factors (notably, occupational demands) were not significant predictors of late-life cognition. There were weak indirect effects of adolescent IQ on global cognitive functioning, episodic memory, and processing speed, working through high school mental activities and education. Verbal fluency, in contrast, was affected by adolescent IQ through links with high school mental activities, but not education.

IMPLICATIONS

Our study suggests that reserve is dynamic, but it is most amenable to change in early life. We conclude that an active, engaged lifestyle, emphasizing mental activity and educational pursuits in early life, can have a positive impact on cognitive functioning in late life.

Does depression prior to caregiving increase vulnerability to depressive symptoms among caregivers of persons with Alzheimer's disease?

Based on the vulnerability model of depression, this study tested the hypothesis that caregivers with prior depression are more likely to be depressed during caregiving than caregivers without prior depression. We further hypothesized an interaction effect in which caregivers with prior depression would be affected more by care-recipient dependency in activities of daily living and care-recipient depressive symptoms than those without prior depression. In a sample of 111 caregivers of persons with Alzheimer's disease, in an additive regression model, neither 'prior depressive symptoms' nor the clinically more serious 'prior depressive syndrome' was related to depressive symptoms during caregiving. In an interaction model, for caregivers with either 'no prior depression' or 'prior depressive symptoms,' the greater the care-recipient dependencies in instrumental activities of daily living (IADL), the greater were the depressive symptoms during caregiving. For caregivers with a 'prior depressive syndrome', however, the greater the IADL dependency, the fewer were the depressive symptoms during caregiving. This unexpected finding suggests that caregivers with a history of clinically significant depression are not necessarily more prone to depressive symptoms when caregiving responsibilities, at least for instrumental activities, are high. This result questions the vulnerability model of depression when applied to older caregivers.

Long-Term-Care Placement and Survival of Persons With Alzheimer's Disease

Although long-term-care (LTC) placement may shorten the survival of persons with Alzheimer's disease, studies have not examined whether the timing of placement matters. A sample of 258 persons with Alzheimer's disease and their family caregivers was used in a Cox survival model that included care-recipient impairments, caregiver characteristics, and LTC placement as covariates. Placement was associated with shortened survival, but the later the placement, the smaller the impact of placement on survival time. In an elaboration on prior work, the increased risk of death associated with wishfulness-intrapsychic caregiver coping was found to occur independently of LTC placement. This is the first study to link delayed LTC with a reduced risk of death in Alzheimer's disease. Interventions to assist family caregivers in the home are indeed appropriate; nevertheless, these findings may help long-term caregivers accept eventual institutionalization for their care recipients when care at home threatens their own health.

Associations Between Dementia/Mild Cognitive Impairment and Cognitive Performance and Activity Levels in Youth

OBJECTIVES

To study the associations between dementia/mild cognitive impairment (MCI) and cognitive performance and activity levels in youth.

DESIGN

Retrospective cohort study.

SETTING

Research volunteers living throughout the United States.

PARTICIPANTS

A total of 396 persons (mean age 75) who were graduates of the same high school in the mid-1940s.

MEASUREMENTS

Adolescent intelligence quotient (IQ) scores were gathered from archived student records, and activity levels were determined from yearbooks. A two-stage telephone screening procedure (Modified Telephone Interview for Cognitive Status or Informant Questionnaire on Cognitive Decline in the Elderly followed by Dementia Questionnaire) was used to determine adult cognitive status. Data were analyzed using logistic regression to model the risk of cognitive impairment (dementia/MCI) versus no cognitive impairment as a function of IQ and activity level, adjusting for sex and education.

RESULTS

High adolescent IQ and greater activity level were each independently associated with a lower risk for dementia/MCI (odds ratio (OR) for a 1-standard deviation increase in IQ=0.51, 95% confidence interval (CI)=0.32-0.79; OR for a unit increase in activity=0.32, 95% CI=0.12-0.84). No association was found between sex or education and adult cognitive status in this model.

CONCLUSION

High IQ and greater activity levels in youth reduce the risk for cognitive impairments in aging. The mechanism(s) underlying these associations are unknown, but intelligence may be a marker for cognitive/neurological "reserve," and involvement in activities may contribute to "reserve." Early neuropathology and ascertainment bias are also possible explanations for the observed associations.

Worker functions and traits associated with occupations and the development of AD

OBJECTIVE

To investigate the association between Alzheimer disease (AD) and worker functions and traits associated with occupations.

BACKGROUND

Studies have reported that occupational attainment is related to AD. However, most have not identified specific worker functions and traits (i.e., occupational demands) of occupations that may explain the association, nor have they accounted for changing occupational demands over time.

METHODS

Within- and between-group differences in mental, motor, physical, and social occupational demands of 122 AD cases and 235 control subjects were compared across four decades of life (20s, 30s, 40s, and 50s) using repeated-measures analyses of covariance adjusted for race, gender, year of birth, and education.

RESULTS

Overall, mental occupational demands were significantly lower and physical occupational demands were significantly higher for cases than for control subjects. Case/control differences in mental demand scores were not found in their 20s but only in later decades. Differences in physical demands were found in all decades but their 30s. Social and motor demands did not differ between cases and control subjects. Among cases only, there were no significant occupational demand score differences across decades. In contrast, mental and social demand scores of control subjects increased in later decades, and motor demand scores declined. Like cases, physical demand scores of control subjects remained stable across the decades.

CONCLUSIONS

The authors' results may indicate a relatively early influence of Alzheimer disease neuropathology on capacity to pursue mentally demanding occupations. However, results also are consistent with the notion that mentally demanding occupations have a direct influence on Alzheimer disease neuropathology.

Survival of Persons With Alzheimer's Disease: Caregiver Coping Matters

PURPOSE

Although persons with Alzheimer's disease (AD) require increasingly more assistance with activities of daily living as their disease progresses, the caregiving environment has received little attention as a source of predictors of their survival time. We report here on a study to determine whether variation in survival time of persons with AD can be better explained by including caregiver variables such as coping style and depressive symptoms as predictors.

DESIGN AND METHODS

A sample of 193 persons with AD residing in the community and their family caregivers was used to estimate the parameters of a Cox regression model of survival time that included both caregiver characteristics and care-recipient impairments as covariates.

RESULTS

Caregiver wishfulness-intrapsychic coping was related to shorter care-recipient survival time, but instrumental and acceptance coping and caregiver depressive symptoms were not associated with survival time. Care-recipient impairments (dependency in activities of daily living, low score on the Mini-Mental State Examination, and problematic behaviors) were associated with shorter survival time.

IMPLICATIONS

Because this study is the first to report the link between caregiver coping and care-recipient survival, further study to understand the dynamics is required. We discuss several possible mechanisms, including the possibility that caregivers engaging in wishfulness-intrapsychic coping are less psychologically available to the person with dementia. These caregivers may therefore provide less person-centered care that is responsive to the true capacities of the person with dementia, and thus they may inadvertently contribute to excess disability and consequent accelerated decline. Because wishfulness-intrapsychic coping was uncorrelated with instrumental or acceptance coping, our findings suggest that interventions to enhance coping skills among caregivers, which have focused primarily on increasing problem solving and acceptance coping, also may have to include specific attempts to reduce wishfulness-intrapsychic approaches to benefit not only the caregiver but the care recipient as well.

Effects of educational attainment and occupational status on cognitive and functional decline in persons with Alzheimer-type dementia

Researchers have suggested that educational attainment and occupational status--indicators of cognitive and/or neurologic "reserve"--can help persons compensate for clinical manifestations of Alzheimer's disease (AD), such as the rates of cognitive and functional decline. The effects of educational attainment on rates of decline could be "direct" independent of occupational status), "indirect" (working through occupational status), or both. We used multilevel analysis for repeated measures to study the effects of educational attainment and occupational status on rates of decline in cognition (Mini-Mental State Examination, MMSE) and function (Cleveland Scale for Activities of Daily Living). Subjects included persons with "probable" or "possible" AD, drawn from our Alzheimer's Disease Research Center registry (N = 482 in the analysis of cognitive decline, and N = 450 in the analysis of functional decline). When controlling for year of birth, gender, ethnicity, and duration of illness, we found that there was an inverse relationship between number of years of education and rate of decline in MMSE, but effects of occupational status were not significant. This implies a "direct" effect of education on decline in MMSE, but no "indirect" effect through occupational status. Neither educational attainment nor occupational status affected rate of decline in functional ability. We conclude that education slows the rate of cognitive decline in persons with AD, but not through its impact on occupational status. Thus, the protective effects of reserve may be established early in life, before people enter the workforce.

Effects of educational attainment on the clinical expression of Alzheimer's disease: results from a research registry

The "reserve" hypothesis suggests that education should affect the clinical expression of Alzheimer's disease (AD), but results from studies examining this idea are not consistent. In a single study, we evaluated the effects of educational attainment on three aspects of the clinical expression of AD: age at symptom onset, rate of cognitive decline, and survival. Subjects were 258 persons with mild- or moderate-stage Alzheimer's, drawn from our AD Research Registry. With statistical adjustment for confounding variables present in a clinic-based design, we found that higher educational attainment was associated with slightly earlier reports of symptom onset and a slower rate of cognitive decline on the Mini-Mental State Exam (MMSE). Education did not affect time of survival until death. We conclude that, for subjects in our sample, education had modest effects on aspects of the clinical expression of AD. These effects were not fully consistent with predictions derived from the "reserve" hypothesis.

A longitudinal study of the relationship between levels of depression among persons with Alzheimer's disease and levels of depression among their family caregivers

The purpose of this study was to examine the effects, over time, of depressive symptoms in persons with Alzheimer's disease on depression in their family caregivers. In a sample of 353 patients and caregivers, multilevel longitudinal analysis was used to accommodate an observational design in which the number of observation points and the intervals between points varied across caregivers. The rate of change (increase) in caregiver depression was predicted by the rate of change (increase) in patient depressive symptoms and by increase in patient dependency in instrumental activities of daily living (ADLs). Acceleration of the increase in caregiver depression was predicted by acceleration in patient dependency in instrumental and basic ADLs but not by acceleration in patient depressive symptoms. These findings indicate the importance of measuring the rate and acceleration of change in patient characteristics in order to understand caregiver depression. They also support early interventions for caregivers.

The buffering effect of a computer support network on caregiver strain

ComputerLink was a computer support network for family caregivers of people with Alzheimer's disease. In a 12-month experiment, 102 caregivers were randomly assigned to an experimental group that had access to ComputerLink or to a control group that did not. This investigation examined whether caregivers in the experimental group had greater reductions in four types of care-related strain by the end of the 1-year study. ComputerLink reduced certain types of strain if caregivers also had larger informal support networks, were spouses, or did not live alone with their care receivers. More frequent use of the communication function was related to significantly reduced strain for caregivers who were initially more stressed and for non-spouse caregivers. Greater use of the information function was related to significantly lower strain among caregivers who lived alone with care receivers. Overall, ComputerLink appeared to be an effective tool for reducing strain for some caregivers.

The influence of a diagnosed mental impairment on family caregiver strain

This study examines whether a diagnosis of mental impairment of a care recipient influences the strain of family caregiving. Two competing hypotheses, derived from labeling theory, provide alternative views. One posits that a diagnosis reduces strain by linking problematic characteristics of care recipients' impairment to an illness. The competing hypothesis suggests that a diagnosis increases strain by reifying the existence of a progressive chronic condition. LISREL analysis with data from a sample of 576 primary caregivers shows that the diagnosis has an important effect, but this influence varies for different types of strain. Relationship strain and restrictions in social activities are increased for caregivers of diagnosed care recipients. Functional impairment also causes a greater restriction of social activities when a diagnosis has been made. A different pattern emerges for depression, with caregivers in the diagnosed group being less depressed and less negatively affected by care recipients' impaired ability for social interaction, but more depressed by disruptive behavior and functional impairment.