Working Memory Training for Older Adults After Major Surgery: Benefits to Cognitive and Emotional Functioning

ObjectivesCognitive and mood changes can affect postoperative recovery in hospitalized older adults undergoing major surgical procedures, but few studies have considered postoperative cognitive interventions to sustain such patients’ cognitive functioning and mood. The aim of this pilot study was to assess the efficacy of working memory training in improving cognitive functioning and mood, or emotional functioning, in older adults undergoing major surgery.MethodsThirty-four older adults (from 64 to 75 years of age) hospitalized for partial or total arthroplasty of the knee were randomly assigned to either a trained group (N = 18) or an active control group (N = 16). The former received working memory training during the postoperative period, while the latter engaged in alternative activities. In addition to specific training gains in a working memory task similar to the one used in the training (criterion task), transfer effects to cognitive abilities (short- and long-term memory, and cognitive inhibition), and mood or emotional functioning (signs of depression or anxiety) were investigated.ResultsImmediately after the training, results showed a main effect of group (in favor of the trained group) in the criterion task, in one of the short-term memory measures, and in cognitive inhibition. In addition, only the trained group showed a decrease in depression and anxiety scores.ConclusionThe results of this pilot study suggest that cognitive training targeting working memory administered in the postoperative period after major surgery can sustain older adults’ cognitive and emotional functioning, and especially their mood.     

Training the Next Generation of Geriatric-Focused Clinical Neuroscientists

It remains challenging to integrate clinical neuroscience into clinical practice. Hindrances at the training level (e.g., lack of qualified faculty and curriculum) contribute to this impasse. To help address this, we present a model of training in clinical neuroscience. We expand on a growing literature on incorporating neuroscience into psychiatry training by emphasizing two points. That is, 1) we propose a training model designed for the geriatric-minded clinician; and 2) that extends across several phases of education and career development. Considering the relevance of dementia to our population of interest, and the potential impact expertise in clinical neuroscience can have in elders with cognitive impairment, we provide relevant curriculum examples at various training stages. Clinical research, both as a practitioner and consumer, figures prominently into our training model. We discuss two mentoring programs, T32 fellowships and Research Career Institute in the Mental Health of Aging, as ways to engage geriatric psychiatrists early in their training and transition them successfully to post-residency clinical investigator positions. Although there is increasing opportunity for geriatric psychiatrists and other clinicians to become leaders in the field of neuroscience, this remains a work in progress; ours and others’ training programs continue to evolve based on input from trainers and trainees alike, as well as from the increasing literature on this important topic.     

International Perspectives on Old Age Psychiatry Training

Psychiatry of old age is a psychiatric subspecialty that has been developed in many countries since the 1950s as an attempt to improve the care of older adults with mental health disorders. Psychiatry of old age specialist training programs were subsequently established to develop a medical workforce that has the required competencies to work in this subspecialty. This article describes the psychiatry of old age specialist training programs in Australia, New Zealand, the United Kingdom, and Mexico. These training programs have varying durations, ranging from 1 to 3 years. Although it may not be a mandatory requirement to complete a psychiatry of old age clinical rotation, psychiatry of old age experience and competencies are expected during general psychiatry training. There is generally a lack of opportunity to learn about other clinical specialties relevant to older adults, such as geriatric medicine and neurology. Finally, much work is needed to better coordinate psychiatry of old age specialist training positions, workforce development, and service delivery to ensure there is a sufficient supply of psychiatry of old age specialists to meet the mental health needs of older adults in different countries in the coming years.     

Metabolic Syndrome,Mild Cognitive Impairment,and Dementia: A Meta-Analysis of Longitudinal Studies

ObjectiveA systematic review and a meta-analysis of both clinical and population-based studies was undertaken according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses statement to clarify whether Metabolic Syndrome (MetS) is a risk or a protective factor for incident dementia, Alzheimer disease (AD), and vascular dementia (VaD), and whether it's involved in progression to dementia in patients affected by mild cognitive impairment (MCI).MethodsSearch terms included (“metabolic syndrome” OR “syndrome x” OR “plurimetabolic syndrome”) AND (“dementia” OR “Alzheimer disease” OR “vascular dementia” OR “mild cognitive impairment” OR “MCI”). Research was restricted to articles published in English between January 1, 2000 and August 31, 2018. No age limit was set.ResultsAt the end of the selection procedure, nine longitudinal studies were selected for the meta-analysis: six studies enrolled cognitively well-functioning participants and three studies involved MCI patients. A total of 18,313 participants aged older than 40 years with mean MetS prevalence of 22.7% were followed on average for 9.41years. A fixed model was used to estimate pooled hazard ratios and 95% confidence intervals.ConclusionNo statistically significant pooled association emerged between MetS and incident dementia and AD. MetS increased the incidence of pure VaD. MetS increased the risk of progression from MCI to dementia. Follow-up length might be a key factor in investigating these associations further. Because MetS is constituted by a set of potentially modifiable factors, further studies with longer follow-up and repeated assessment of both MetS and cognitive status are desirable to draw definite conclusions.     

Social Support and Depression Related to Older Adults’ Hypertension Control in Rural China

ObjectiveThis study aimed to investigate association between social support and hypertension (HTN) control in rural China older adults, and to what extent depression mediates this relationship. The authors hypothesized that depression severity mediated the relationship between social support and HTN control.MethodsData for the analyses were obtained from baseline data from a randomized controlled clinical trial of a collaborative depression care management intervention conducted in rural villages of China, with older adults with comorbid depression and HTN. Data included baseline assessments of 2,351 subjects aged 60 years and older, whose blood pressure and depression severity were measured using a calibrated manual sphygmomanometer and the 17-item Hamilton Depression Rating Scale (HDRS-17), respectively. Social support was measured using the 20-item Medical Outcomes Study–Social Support Survey.ResultsUncontrolled HTN was associated with older age (t[df = 2349] = 3.16; p < 0.01), higher HDRS-17 score (t[df = 1488] = 5.89; p < 0.001), and lower social support (t[df = 2349] = 5.37; p < 0.001). A significant indirect effect of social support via depression severity in relation to HTN control (a × b = –0.04[0.01]), bootstrap p = 0.0015, and 95% confidence interval (–0.07, –0.02), accounting for 11% of the effect of social support on HTN control.ConclusionThese findings imply that social support impacts HTN control directly and indirectly through depression. Intervention approaches such as primary care-based collaborative care models should address social support to achieve greater outcomes for depression and HTN management.     

The Utility of Episodic Memory Cut-Off Scores for Inclusion in Clinical Trials for Early Symptomatic Alzheimer Disease

Correctly diagnosing early symptomatic Alzheimer disease in the context of multinational clinical trials poses a significant challenge. Subjective complaints of memory are fairly ubiquitous in an older population, and establishing the presence of definitive cognitive decline from clinical assessments is difficult. Most such trials have adopted the use of standardized episodic memory measures as an inclusion criterion, typically setting the cutoff at one standard deviation below age normal means. This is useful in terms of establishing the presence of an objective impairment of memory, thereby excluding subjects with purely subjective complaints and increasing the probability that clinical outcome measures will be sensitive to disease progression. Further demographic adjustments are unnecessary as other demographic variables are not strongly associated with memory performance, are difficult to equate across cultures, and will not eventuate in reduced screen fail rates and would be challenging to implement. Not all episodic memory measures are equivalent for this purpose, however, and existing data suggest significant variability in terms of specificity for identifying true (i.e., amyloid positive) early symptomatic AD.     

Relationships Between Executive Control Circuit Activity,Amyloid Burden,and Education in Cognitively Healthy Older Adults

IntroductionIn cognitively healthy older adults, amyloid-beta (Aβ) burden is associated with greater activity on task-based functional magnetic resonance imaging. Higher levels of functional activation are associated with other factors along with amyloid and the authors investigated these relationships as well as how they relate to Aβ in cognitively healthy older adults.MethodsThe authors recruited cognitive healthy older adults (N = 50) from the Pittsburgh community that underwent extensive cognitive batteries, activation during a working memory (digit symbol substitution task, DSST), positron emission tomography scan for Pittsburgh Compound B (PiB, measuring amyloid), and other demographic measures. The authors tested the association between DSST activation and global PiB, neurocognitive batteries, and education.ResultsThe authors found that the DSST robustly activated expected structures involved in working memory. The authors found that greater global Aβ deposition was associated with greater DSST activation in the right calcarine, precuneus, middle temporal as well as the left insula and inferior frontal gyrus. The authors also found that greater education was associated with lower DSST activation – however this was not significant after adjusting for Aβ.DiscussionGreater amyloid was associated with greater activation, which may represent compensatory activation. Greater education was associated with lower activation, which may represent more efficient activation (i.e., less activation for the same task). After adjusting for amyloid, education was not significantly associated with activation suggesting that during the preclinical stage amyloid is the primary determinant of activation. Further, activation was not associated with cognitive function. Compensatory activation in the preclinical stage may help maintain cognitive function.     

Depression Agency-Based Collaborative: Effect of Problem-Solving Therapy on Risk of Common Mental Disorders in Older Adults With Home Care Needs

BackgroundInterventions to prevent depression in older adults have mainly focused on young-old ambulatory adults, not on the old-old with disabilities who receive supportive services in their homes.ObjectiveThe Depression Agency-Based Collaborative (Dep-ABC) is a single-blind pilot randomized controlled trial assessing the effect of an intervention-development strategy using problem-solving therapy (PST) on the risk of common mental health disorders in this vulnerable population.MethodsThe intervention involved six to eight sessions of PST over 12 weeks. Participants were followed up to 12 months postintervention.ResultsDep-ABC randomized 104 participants—68.4% of eligible and 17.5% of all older adults screened. The proportion of participants with incident major depressive disorder or generalized anxiety disorder was 11.4% in PST and 14.3% in the enhanced usual care control arm. A test of the interaction between time and intervention for anxiety symptoms favored the PST arm (p = 0.04).ConclusionPST did not lower the risk of incident common mental illness but did lower anxiety symptom burden. Apart from low power, the effects of PST may have been blunted by referral for medical and aging services in the enhanced usual care group.     

Beyond Depression: Estimating 12-Months Prevalence of Passive Suicidal Ideation in Mid- and Late-Life in the Health and Retirement Study

ObjectivesTo provide valid estimates of the 12-month prevalence of passive suicidal ideation among older adults, without conditioning on depression status, using the Health and Retirement Study (HRS).MethodsData come from the 2012 HRS (n = 17,434) and 2004/5 Baltimore Epidemiologic Catchment Area (ECA) Study (n = 755). In the HRS, passive suicidal ideation (i.e., thought a lot about death—your own, someone else's, or death in general) is only assessed on respondents who reported dysphoria/anhedonia; in the ECA, ideation is assessed on all respondents, regardless of depression. We compare two approaches to estimating the 12-month prevalence of passive suicidal ideation in the HRS without conditioning on depression symptoms: 1) a probit selection model within the HRS, and 2) a prediction model developed using appended ECA data applied to the HRS.ResultsUsing observed data alone on those who screened positive for depression, 6% of older adults reported passive suicidal ideation in the past year. Depending on the approach used, between 5.4% and 9.2% of HRS respondents who screened negative for depression would have reported passive suicidal ideation had they been assessed. Correcting for this selection bias, between 10.9% and 13.4% of U.S. adults over age 50 experienced passive suicidal ideation in 2012.ConclusionsPopulation surveillance of suicidal ideation among older adults is biased by survey approaches that only assess ideation in the context of depression.     

Mild Behavioral Impairment as a Marker of Cognitive Decline in Cognitively Normal Older Adults

ObjectiveMild behavioral impairment (MBI) is a neurobehavioral syndrome characterized by later life emergent neuropsychiatric symptoms (NPS) that represent an at-risk state for incident cognitive decline and dementia in people with mild cognitive impairment (MCI). We undertook a study to determine whether MBI was associated with progressive changes in neuropsychological performance in people without significant cognitive impairment.MethodsA total of 9,931 older adults enrolled in the PROTECT study who did not have MCI or dementia undertook a comprehensive neuropsychological battery measuring attention, reasoning, executive function, and working memory at baseline and 1 year. MBI was ascertained using self-administration of the Mild Behavioral Impairment Checklist at 1 year, and participants were grouped according to MBI status: No Symptoms, Intermediate NPS and MBI. All assessments were completed online, and data analyzed using mixed-effects model repeated measures analysis of covariance.ResultsA total of 949 (10%) people had MBI. These individuals had significantly worse cognitive performance at baseline and significantly greater decline over 1 year in the four composite cognitive scores measuring attentional intensity (F [2,8578] = 3.97; p = 0.019), sustained attention (F [2,8578] = 18.63; p <0.0001), attentional fluctuation (F [2,8578] = 10.13; p <0.0001) and working memory (F [2,9895] = 13.1; p <0.0001).ConclusionOur novel findings show that MBI is associated with faster decline in attention and working memory in this cognitively normal sample. MBI may be an earlier marker of neurodegenerative disease than MCI, captured at the stage of subjective cognitive decline or before, raising the possibility that MBI represents a novel target for dementia clinical trials or prevention strategies.     

Exposure to Antidepressant Medication and the Risk of Incident Dementia

ObjectiveTo test competing hypotheses that monotherapeutic antidepressant exposure is associated with an increased versus a decreased risk of dementia.MethodsA prospective national matched cohort study from Israel (N = 71,515) without dementia (2002–2012) aged 60 and over were followed up for incident dementia from May 2013 to October 2017. Exposure to antidepressant monotherapy was classified with Anatomical Therapeutic Chemical Codes (N06A) from January 1, 2013 to December 31, 2016. The association between antidepressant monotherapy and the risk of incident dementia was quantified with hazard ratios (HR) and their 95% confidence intervals (CI) obtained from Cox regression models unadjusted and adjusted for 42 covariates. The robustness of the results was tested with 24 sensitivity analyses: 19 analyses restricted to subsamples with plausible differential dementia risks (e.g., anxiety and depression), and 5 analyses across and within antidepressant drug classes.ResultsIn the primary analysis, the risk of incident dementia for the group exposed to antidepressant monotherapy compared to the group unexposed to antidepressants was estimated with an unadjusted HR = 4.09 (df = 1, 95% Wald CI = 3.64, 4.60) and an adjusted HR = 3.43 (df = 1, 95% Wald CI = 3.04, 3.88). Across the 24 sensitivity analyses the estimated adjusted HR values ranged from 1.99 to 5.47.ConclusionIn this study, monotherapeutic antidepressant exposure in old age was associated with increased incident dementia. Clinicians, caregivers, and patients may wish to consider this potentially negative consequence of antidepressant exposure and aim to balance the costs and benefits of treatment.     

The effects of the increase of arterial potassium upon the excitability of normal and dystrophic myotonic muscles in man

Progressively increasing concentrations of potassium chloride were administered intra-arterially to patients affected with dystrophia myotonica (Steinert's disease) and to healthy volunteers before and after parenteral taurine treatment. Changes in the excitability of thenar eminence muscles were related to plasma potassium concentrations. A rise in the plasma potassium brought about a parallel increase of muscular excitability in normal individuals whilst in dystrophic myotonic patients it was associated with a two-phase phenomenon: the severity of myotonia first decreased and then, at higher plasma potassium levels, greatly worsened with the occurrence of spontaneous myotonic discharges. The administration of taurine, a membrane-stabilizing drug, considerably lowered the excitability of both normal and dystrophic myotonic muscles. The effects of potassium and taurine on muscular membrane conductance may explain the observed changes in muscular excitability.     

The quantification of myotonia. A problem in the evaluation of new antimyotonic drugs

The evaluation of an antimyotonic drug is often difficult since the severity of myotonia is itself hard to assess. The rise in arterial potassium level produced by the infusion of increasing concentrations of potassium chloride brought about reproducible changes in the excitability level of myotonic muscles proportional to the plasma potassium concentration. The excitability changes were assessed by three methods commonly used for evaluating antimyotonic drugs. The duration of the electromyographic relaxation time after maximal voluntary effort proved to be the only test which reliably assessed the variations of muscular excitability proportional to the increased plasma potassium. By contrast, the duration of percussion- or electrically-induced myotonic after-discharges was extremely variable and independent of plasma potassium.     

Perspectives on Training Needs for Geriatric Mental Health Providers: Preparing to Serve a Diverse Older Adult Population

An increasingly diverse population of older adults requires a diverse workforce trained to address the problem of differential healthcare access and quality of care. This article describes specific areas of training focused on addressing health disparities based on ethnic differences. Culturally competent care by mental health providers, innovative models of mental health service delivery such as collaborative care, and expansion of the mental health workforce through integration of lay health workers into professional healthcare teams, offer potential solutions and require training. Cultural competency, defined as respect and responsiveness to diverse older adults' health beliefs, should be an integral part of clinical training in mental health. Clinicians can be trained in avoidance of stereotyping, communication and development of attitudes that convey cultural humility when caring for diverse older adults. Additionally, mental health clinicians can benefit from inter-professional education that moves beyond professional silos to facilitate learning about working collaboratively in interdisciplinary, team-based models of mental health care. Finally, familiarity with how lay health workers can be integrated into professional teams, and training to work and supervise them are needed. A growing and diversifying population of older adults and the emergence of innovative models of healthcare delivery present opportunities to alleviate mental health disparities that will require relevant training for the mental health workforce.     

The Roles of Apathy and Depression in Predicting Alzheimer Disease: A Longitudinal Analysis in Older Adults With Mild Cognitive Impairment

ObjectiveApathy and depression have each been associated with an increased risk of conversion from mild cognitive impairment (MCI) to Alzheimer disease (AD).These symptoms often co-occur and the contribution of each to risk of AD is not clear.MethodsNational Alzheimer's Coordinating Center participants diagnosed with MCI at baseline and followed until development of AD or loss to follow-up (n = 4,932) were included. The risks of developing AD in MCI patients with neuropsychiatric symptoms (NPS) (apathy only, depression only, or both) were compared to that in those without NPS in a multivariate Cox regression survival analysis adjusting for baseline cognitive impairment, years of smoking, antidepressant use, and AD medication use.ResultsThirty-seven percent (N = 1713) of MCI patients developed AD (median follow-up 23 months). MCI patients with both apathy and depression had the greatest risk (hazard ratio [HR] = 1.37; 95% confidence interval [CI]: 1.17–1.61; p < 0.0001; Wald χ² = 14.70; df = 1). Those with apathy only also had a greater risk (HR = 1.24; 95% CI: 1.05–1.47; p = 0.01; Wald χ² = 6.22; df = 1), but not those with depression only (HR = 1.08; 95% CI: 0.95–1.22; p=0.25; Wald χ² = 1.30; df = 1). Post-hoc analyses suggested depression may exacerbate cognitive decline in MCI patients with apathy (odds ratio = 0.70; 95% CI 0.52–0.95; p = 0.02; Wald χ² = 5.28; df = 1), compared to those without apathy.ConclusionMCI patients with apathy alone or both apathy and depression are at a greater risk of developing AD compared to those with no NPS. Interventions targeting apathy and depression may reduce risk of AD.     

Particulate Air Pollutants and Trajectories of Depressive Symptoms in Older Women

ObjectivesAlthough several environmental factors contribute to the etiology of late-life depressive symptoms, the role of ambient air pollution has been understudied. Experimental data support the neurotoxicity of airborne particulate matter with aerodynamic diameter of ≤2.5 μm (PM_2.5), but it remains unclear whether long-term exposure is associated with late-life depressive symptoms. Our secondary aim was to explore whether the observed associations between exposure and depressive symptoms are explained by dementia risk.Design, Setting, and ParticipantsProspective community-dwelling cohort study from the Women's Health Initiative Study of Cognitive Aging (1999–2010). Our analyses included 1,989 older women (baseline age 73.3 ± 3.75) with no prior depression or cognitive impairment.MeasurementsParticipants completed annual assessments of depressive symptoms (15-item Geriatric Depression Scale). Average ambient PM_2.5 exposure at the residential location was estimated by spatiotemporal modeling for the 3-years preceding each neuropsychological assessment. Participants underwent separate annual examinations for incident dementia defined by DSM-IV. Latent-class mixture models examined the association between PM_2.5 and identified trajectories of symptoms.ResultsSix trajectories of depressive symptoms were identified. Across all women, PM_2.5 exposure was positively associated with depressive symptoms. The effect was especially strong in two clusters with sustained depressive symptoms (n = 625 sustained-mild [31%]; n = 125 sustained-moderate; [6%]). Among those with sustained-moderate symptoms, the estimated adverse effect of PM_2.5 exposure was greater than that of hypertension. Among women without dementia, associations were modestly attenuated.ConclusionLong-term exposure to ambient fine particles was associated with increased depressive symptoms among older women without prior depression or cognitive impairment.     

Changes in Moderate Intensity Physical Activity Are Associated With Better Cognition in the Multilevel Intervention for Physical Activity in Retirement Communities (MIPARC) Study

ObjectiveThe authors investigated if the physical activity increases observed in the Multilevel Intervention for Physical Activity in Retirement Communities (MIPARC) improved cognitive functions in older adults. The authors also examined if within-person changes in moderate to vigorous physical activity (MVPA), as opposed to low-light and high-light physical activity, were related to cognitive improvements in the entire sample.MethodsThis was a cluster randomized control trial set in retirement communities in San Diego County, CA. A total of 307 older adults without a formal diagnosis of dementia (mean age: 83 years; age range: 67–100; standard deviation: 6.4 years; 72% women) were assigned to the physical activity (N = 151) or healthy education control (N = 156) groups. Interventions were led by study staff for the first 6 months and sustained by peer leaders for the next 6 months. Components included individual counseling and self-monitoring with pedometers, group education sessions, and printed materials. Measurements occurred at baseline, 6 months, and 12 months. Triaxial accelerometers measured physical activity for 1 week. The Trail Making Test (TMT) Parts A and B and a Symbol Search Test measured cognitive functions.ResultsThere were no significant differences in cognitive functions between the MIPARC intervention and control groups at 6 or 12 months. Within-person increases in MVPA, and not low-light or high-light physical activity, were associated with improvements in TMT Parts B, B-A, and Symbol Search scores in the entire sample.ConclusionFindings suggest that MVPA may have a stronger impact on cognitive functions than lower intensity physical activity within retirement community samples of highly educated older adults without dementia.