[Recommendations for the Prevention, Diagnostics and Therapy of Addiction Disorders in the Elderly]

Recommendations for the Prevention, Diagnostics and Therapy of Addiction Disorders in the Elderly Abstract. Although the chronic consumption of alcohol and sedatives, and increasingly opioids, represents a major problem in old age with consequential damage for those affected, little attention has been paid to the substance abuse disorders in old age. The aim of the present recommendations, a collaboration work of the Swiss Society for Geriatric Psychiatry and Psychotherapy (SGAP), Swiss Nurses Association (SBK) and Swiss Society of Addiction Medicine (SSAM), is to summarize the current state of knowledge in prevention, diagnostics and therapy of substance abuse disorders in old age for an interprofessional clinical team. They are intended to help strengthen prevention and early diagnosis, and consciously emphasize psychotherapy and nursing intervention options.

Shaping the slow waves of sleep: A systematic and integrative review of sleep slow wave modulation in humans using non-invasive brain stimulation

The experimental study of electroencephalographic slow wave sleep (SWS) stretches over more than half a century and has corroborated its importance for basic physiological processes, such as brain plasticity, metabolism and immune system functioning. Alterations of SWS in aging or pathological conditions suggest that modulating SWS might constitute a window for clinically relevant interventions. This work provides a systematic and integrative review of SWS modulation through non-invasive brain stimulation in humans. A literature search using PubMed, conducted in May 2020, identified 3220 studies, of which 82 fulfilled inclusion criteria. Three approaches have been adopted to modulate the macro- and microstructure of SWS, namely auditory, transcranial electrical and transcranial magnetic stimulation. Our current knowledge about the modulatory mechanisms, the space of stimulation parameters and the physiological and behavioral effects are reported and evaluated. The integration of findings suggests that sleep slow wave modulation bears the potential to promote our understanding of the functions of SWS and to develop new treatments for conditions of disrupted SWS.

Curriculum Development with the Implementation of an Open-Source Learning Management System for Training Early Clinical Students: An Educational Design Research Study

BACKGROUND

Learning management systems (LMSs) have not been explored from an educational design research (EDR) perspective for developing clinical curricula and supporting novice clinical students with self-regulated learning during their early clinical rotations.

METHODS

An EDR approach was used to inform a de novo implementation of an LMS during an early clinical rotation of medical students. The EDR consisted of three phases: analysis and exploration; design and construction; and evaluation and reflection. Process and evaluation data (including academic years 2018 and 2019) from two student cohorts (total n = 190, 107 without and 83 with LMS exposure) at one academic teaching hospital were analyzed.

RESULTS

Learning theories and concepts of self-regulated learning were used to develop and implement an LMS clerkship prototype. For design and construction, the maturing prototype design included flipped-classroom elements, in-class activation, voluntary digital self-assessments, and clinical teaching videos. For evaluation and reflection, global satisfaction improvement was significant (from 3.9 to 4.4 on a 5-point Likert scale, p < 0.05). There was a positive evaluation trend for all evaluation items related to learning climate, self-regulated learning, and perceived usefulness of the LMS prototype; however, these changes were not statistically significant. The teaching hospital also improved its ranking after the introduction of the LMS prototype. Nearly all students (94%) used the LMS material. The average number of times the LMS course was accessed per student was 70 (range: 7-172), and the average duration students spent online was 58 minutes (range: 9-165).

CONCLUSION

Our data indicate that using an EDR approach was helpful for systematically introducing an LMS in a clerkship curriculum informed by learning theory. Our evidence-oriented curriculum reform was associated with higher student satisfaction and appeared to support self-regulated learning in the workplace. Further research should explore which elements of an LMS most effectively help to achieve educational outcomes.

[Recommendations for the Diagnosis and Therapy of Psychotic Disorders in the Elderly]

Recommendations for the Diagnosis and Therapy of Psychotic Disorders in the Elderly Abstract. Psychotic disorders in the elderly cover a wide range of causes and manifestations. They often occur as part of a depression, dementia, substance abuse or delirium. While psychosis can occur with a first manifestation in advanced age, many patients with chronic psychotic disorders reach a high age. Many elderly individuals are also affected by cognitive impairment and somatic conditions, making a third-party history most relevant. The associated changes in life and the complexity of the individual situation needs to be integrated into the diagnosis and treatment. The presented recommendations have been developed under the lead of the Swiss Society of Old Age Psychiatry (SGAP) in collaboration with the Swiss Association of Nurses (SBK) and the subcommittees for gerontological and psychiatric nursing of the association of nursing science (VFP) as well as further professional societies. We aim to make current knowledge concerning diagnosis and treatment available to the interprofessional teams working in in- and outpatients' settings.

[Entrustable Professional Activities in Graduate Medical Education in Psychiatry: A Promising Concept]

Entrustable Professional Activities in Graduate Medical Education in Psychiatry: A Promising Concept Abstract. Entrustable Professional Activities (EPAs) are competency-based learning goals derived from observable clinical activities. In undergraduate medical education, they have now been adopted throughout Switzerland as part of the so-called PROFILES catalog (Principal Relevant Objectives and Framework for Integrated Learning and Education in Switzerland). The nine core EPAs to be mastered in undergraduate medical education can serve as a basis for introducing EPAs in graduate medical education as well. We will discuss this approach in the context of graduate medical education in psychiatry and psychotherapy from the perspective of different training contexts and a pilot example. In this position paper, we describe a promising opportunity to improve graduate medical training through the implementation of EPAs, both in terms of the quality of training and thus of patient care, as well as in terms of the attractiveness of the specialty for future residents.

Stimulating aged brains with transcranial direct current stimulation: Opportunities and challenges

Ageing involves significant neurophysiological changes that are both systematic while at the same time exhibiting divergent trajectories across individuals. These changes underlie cognitive impairments in elderly while also affecting the response of aged brains to interventions like transcranial direct current stimulation (tDCS). While the cognitive benefits of tDCS are more variable in elderly, older adults also respond differently to stimulation protocols compared to young adults. The age-related neurophysiological changes influencing the responsiveness to tDCS remain to be addressed in-depth. We review and discuss the premise that, in comparison to the better calibrated brain networks present in young adults, aged systems perform further away from a homoeostatic set-point. We argue that this age-related neurophysiological deviation from the homoeostatic optimum extends the leeway for tDCS to modulate the aged brain. This promotes the potency of immediate tDCS effects to induce directional plastic changes towards the homoeostatic equilibrium despite the impaired plasticity induction in elderly. We also consider how age-related neurophysiological changes pose specific challenges for tDCS that necessitate proper adaptations of stimulation protocols. Appreciating the distinctive properties of aged brains and the accompanying adjustment of stimulation parameters can increase the potency and reliability of tDCS as a treatment avenue in older adults.

The role of slow wave sleep in the development of dementia and its potential for preventative interventions

The increasing incidence rate of dementia underlines the necessity to identify early biomarkers of imminent cognitive decline. Recent findings suggest that cognitive decline and the pathophysiology of Alzheimer's disease are closely linked to disruptions in slow wave sleep (SWS) - the deepest sleep stage. SWS is essential for memory functions and displays a potentially causal and bidirectional link to the accumulation of amyloid beta deposition. Accordingly, improving SWS in older adults - especially when at risk for dementia - might slow down the rate of cognitive decline. Recent work suggests that SWS can be improved by specifically targeting the electrophysiological peaks of the slow waves with acoustic stimulation. In older adults, this approach is still fairly new and accompanied by challenges posed by the specific complexity of their sleep physiology, like lower amplitude slow waves and fragmented sleep architecture. We suggest an approach that tackles these issues and attempts to re-instate a sleep physiology that resembles a younger, healthier brain. With enough SWS of high quality, metabolic clearance and memory functions could benefit and help slowing the process of cognitive aging. Ultimately, acoustic stimulation to enhance SWS could serve as a cost-effective, non-invasive tool to combat cognitive decline.

Indices of cortical plasticity after therapeutic sleep deprivation in patients with major depressive disorder

BACKGROUND

Therapeutic sleep deprivation (SD) presents a unique paradigm to study the neurobiology of major depressive disorder (MDD). However, the rapid antidepressant mechanism, which differs from today's slow first-line treatments, is not sufficiently understood. We recently integrated two prominent hypotheses of MDD and sleep, the synaptic plasticity hypothesis of MDD and the synaptic homeostasis hypothesis of sleep-wake regulation, into a synaptic plasticity model of therapeutic SD in MDD. Here, we further tested this model positing that homeostatically elevating net synaptic strength through therapeutic SD shifts the initially deficient inducibility of associative synaptic long-term potentiation (LTP)-like plasticity in patients with MDD into a more favorable window of associative plasticity.

METHODS

We used paired associative stimulation (PAS), a transcranial magnetic stimulation protocol (TMS), to quantify cortical LTP-like plasticity after one night of therapeutic sleep deprivation in 28 patients with MDD.

RESULTS

We demonstrate a significantly different inducibility of associative plasticity in clinical responders to therapeutic SD (> 50% improvement on the 6-item Hamilton-Rating-Scale for Depression, n=13) compared to non-responders (n=15), which was driven by a long-term depression (LTD)-like response in SD-non-responders. Indices of global net synaptic strength (wake EEG theta activity, intracortical inhibition and BDNF serum levels) were increased after SD in both groups, with responders showing a generally lower intracortical inhibition than non-responders.

LIMITATIONS

Repetitive assessments prior to and after treatment would be needed to further determine potential mechanisms.

CONCLUSION

After a night of therapeutic SD, clinical responders show a significantly higher inducibility of associative LTP-like plasticity than non-responders.

Advances in Sensor Monitoring Effectiveness and Applicability: A Systematic Review and Update

BACKGROUND AND OBJECTIVES

To provide an updated review article studying the applicability and effectiveness of sensor networks in measuring and supporting activities of daily living (ADLs) among non-demented older adults.

RESEARCH DESIGN AND METHODS

Systematic review following PRISMA guidelines.

Systematic search of PubMed, Embase, PsycINFO, INSPEC, and the Cochrane Library, from October 26, 2012 to January 3, 2018 for empirical studies, measuring and supporting ADLs among independently living, non-demented older adults, investigating wireless sensor monitoring networks.

RESULTS

The search queries yielded 10,782 hits of which 162 articles were manually reviewed. Following exclusion criteria, 13 relevant articles were retained. Although various types of sensor networks with different analyzing algorithms were proposed, from simple video monitoring to complex sensor networks distributed throughout a house, all articles supported the use of wireless sensors for identifying changes in activity patterns.

DISCUSSION AND IMPLICATIONS

Wireless sensor networks appear to be developing into an effective solution for measuring ADLs and for identifying changes in their patterns. They offer a promising solution to support older adults living independently at home. However, there is too much focus on technology, and practical usefulness still needs to be further elaborated. Sensors should focus on ADLs that are sensitive to the earliest signs of cognitive decline, as well as quantitative markers, such as errors in the execution of ADLs.

An individual participant data analysis of prospective cohort studies on the association between subclinical thyroid dysfunction and depressive symptoms

In subclinical hypothyroidism, the presence of depressive symptoms is often a reason for starting levothyroxine treatment. However, data are conflicting on the association between subclinical thyroid dysfunction and depressive symptoms. We aimed to examine the association between subclinical thyroid dysfunction and depressive symptoms in all prospective cohorts with relevant data available. We performed a systematic review of the literature from Medline, Embase, Cumulative Index to Nursing and Allied Health Literature, and the Cochrane Library from inception to 10th May 2019. We included prospective cohorts with data on thyroid status at baseline and depressive symptoms during follow-up. The primary outcome was depressive symptoms measured at first available follow-up, expressed on the Beck's Depression Inventory (BDI) scale (range 0-63, higher values indicate more depressive symptoms, minimal clinically important difference: 5 points). We performed a two-stage individual participant data (IPD) analysis comparing participants with subclinical hypo- or hyperthyroidism versus euthyroidism, adjusting for depressive symptoms at baseline, age, sex, education, and income (PROSPERO CRD42018091627). Six cohorts met the inclusion criteria, with IPD on 23,038 participants. Their mean age was 60 years, 65% were female, 21,025 were euthyroid, 1342 had subclinical hypothyroidism and 671 subclinical hyperthyroidism. At first available follow-up [mean 8.2 (± 4.3) years], BDI scores did not differ between participants with subclinical hypothyroidism (mean difference = 0.29, 95% confidence interval =  - 0.17 to 0.76, I² = 15.6) or subclinical hyperthyroidism (- 0.10, 95% confidence interval =  - 0.67 to 0.48, I² = 3.2) compared to euthyroidism. This systematic review and IPD analysis of six prospective cohort studies found no clinically relevant association between subclinical thyroid dysfunction at baseline and depressive symptoms during follow-up. The results were robust in all sensitivity and subgroup analyses. Our results are in contrast with the traditional notion that subclinical thyroid dysfunction, and subclinical hypothyroidism in particular, is associated with depressive symptoms. Consequently, our results do not support the practice of prescribing levothyroxine in patients with subclinical hypothyroidism to reduce the risk of developing depressive symptoms.

Informant Questionnaires in Dedicated Memory Clinics: How Much Do They Contribute?

BACKGROUND/OBJECTIVES

The diagnostic process in a university memory clinic is based largely on cognitive testing. However, input from informants, acquired through interview or questionnaires, may significantly impact diagnosis. We sought to evaluate whether informant questionnaires for basic and instrumental activities of daily living, or for identifying progressive cognitive decline would improve diagnostic predictability of neurodegenerative disorders compared with either the Consortium to Establish a Registry for Alzheimer's Disease (CERAD) neuropsychological test battery or the Mini-Mental State Examination score alone.

DESIGN

Retrospective data analysis using logit models.

SETTING

University hospital outpatient memory clinic.

PARTICIPANTS

A total of 394 patients with dementia, mild cognitive impairment (MCI), depression, or subjective cognitive impairment were assessed.

MEASUREMENTS

Bristol Activities of Daily Living Scale, Functional Activities Questionnaire, Informant Questionnaire on Cognitive Decline in the Elderly, and the Physical Self-Maintenance Scale questionnaires were obtained. Analyses through logit models were performed to predict outcome diagnoses, based on cognitive scores alone or in combination with one or more informant questionnaires.

RESULTS

The four questionnaires were highly correlated (.31-.86). The addition of informant questionnaires improved diagnostic predictability between differential diagnoses of MCI and dementia, or dementia and depression. However, the misprediction rate was reduced by up to 6 percentage points only. Adding more than one questionnaire or all CERAD subtests instead of their sum score never improved prediction in regularized logit models to a clinically relevant extent.

CONCLUSION

Although questionnaires contribute to a statistically better prediction of the outcome diagnosis, for some sets of differential diagnoses, the benefit may not be clinically pertinent when routine semistructured informant interviews are used by trained personnel. However, standardized assessment, particularly when patients are seen longitudinally, should not be underestimated.

Identification of a Cascade of Changes in Activities of Daily Living Preceding Short-Term Clinical Deterioration in Mild Alzheimer's Disease Dementia via Lead-Lag Analysis

BACKGROUND

Cognitive functions and activities of daily living (ADL) become increasingly impaired with progressing Alzheimer's disease. However, the temporal dynamics of this decline are inconsistent.

OBJECTIVE

To gain insight into the classical temporal cascade of specific cognitive and ADL changes, which may aid in improving detection of an impending clinical deterioration in patients, and to select ADL items and tests most sensitive to change in a specific disease stage.

METHODS

Patients with mild Alzheimer's dementia (AD; MMSE = 23.9±2.88) were followed at 12 and 24 months. Lead-lag analysis of changes in cognitive and functional outcome measures (CDR-SOB, 12 neuropsychological subtest scores from the CERAD + test battery, 25 Bayer-ADL items) was applied to rank the temporal sequence of changes on an ordinal scale.

RESULTS

Of 164 patients with mild AD, moderate disease progression was identified in 84 patients over 24 months (ΔMMSE 5.8±8.64; ΔCDR-SOB 4.32±4.03). Ten Bayer-ADL item measures were altered early in moderate progressors and included in a new ADL composite score. Accordingly, the new ADL score surpassed all neuropsychological measures in repeated lead-lag analysis. The Bayer-ADL total score, TMT-A, and MMSE were lagging variables in all lead-lag analyses.

CONCLUSION

Short-term clinical deterioration in mild AD is initially preceded by changes (i.e., decline) in a well-defined set of ADL and not in classical cognitive measures.

Bupropion for the Treatment of Apathy in Alzheimer Disease: A Randomized Clinical Trial

IMPORTANCE

Apathy is a frequent neuropsychiatric symptom in dementia of Alzheimer type and negatively affects the disease course and patients' and caregivers' quality of life. Effective treatment options are needed.

OBJECTIVE

To examine the efficacy and safety of the dopamine and noradrenaline reuptake inhibitor bupropion in the treatment of apathy in patients with dementia of Alzheimer type.

DESIGN, SETTING, AND PARTICIPANTS

This 12-week, multicenter, double-blind, placebo-controlled, randomized clinical trial was conducted in a psychiatric and neurological outpatient setting between July 2010 and July 2014 in Germany. Patients with mild-to-moderate dementia of Alzheimer type and clinically relevant apathy were included. Patients with additional clinically relevant depressed mood were excluded. Data analyses were performed between August 2018 and August 2019.

INTERVENTIONS

Patients received either bupropion or placebo (150 mg for 4 weeks plus 300 mg for 8 weeks). In case of intolerability of 300 mg, patients continued to receive 150 mg throughout the study.

MAIN OUTCOMES AND MEASURES

Change on the Apathy Evaluation Scale-Clinician Version (AES-C) (score range, 18-72 points) between baseline and week 12 was the primary outcome parameter. Secondary outcome parameters included measures of neuropsychiatric symptoms, cognition, activities of daily living, and quality of life. Outcome measures were assessed at baseline and at 4, 8, and 12 weeks.

RESULTS

A total of 108 patients (mean [SD] age, 74.8 [5.9] years; 67 men [62%]) were included in the intention-to-treat analysis, with 54 randomized to receive bupropion and 54 randomized to receive placebo. The baseline AES-C score was comparable between the bupropion group and the placebo group (mean [SD], 52.2 [8.7] vs 50.4 [8.2]). After controlling for the baseline AES-C score, site, and comedication with donepezil or galantamine, the mean change in the AES-C score between the bupropion and placebo groups was not statistically significant (mean change, 2.22; 95% CI, -0.47 to 4.91; P = .11). Results on secondary outcomes showed statistically significant differences between bupropion and placebo in terms of total neuropsychiatric symptoms (mean change, 5.52; 95% CI, 2.00 to 9.04; P = .003) and health-related quality of life (uncorrected for multiple comparisons; mean change, -1.66; 95% CI, -3.01 to -0.31; P = .02) with greater improvement in the placebo group. No statistically significant changes between groups were found for activities of daily living (mean change, -2.92; 95% CI, -5.89 to 0.06; P = .05) and cognition (mean change, -0.27; 95% CI, -3.26 to 2.73; P = .86). The numbers of adverse events (bupropion group, 39 patients [72.2%]; placebo group, 33 patients [61.1%]) and serious adverse events (bupropion group, 5 patients [9.3%]; placebo group, 2 patients [3.7%]) were comparable between groups.

CONCLUSIONS AND RELEVANCE

Although it is safe, bupropion was not superior to placebo for the treatment of apathy in patients with dementia of Alzheimer type in the absence of clinically relevant depressed mood.

TRIAL REGISTRATION

EU Clinical Trials Register Identifier: 2007-005352-17.

Evidence gap on antihyperglycemic pharmacotherapy in frail older adults : A systematic review

Background

Although antihyperglycemic pharmacotherapy in frail older adults with type 2 diabetes mellitus (T2DM) is challenging, recommendations from international guidelines are mainly based on indirect evidence from trials not including frail participants.

Objective

This systematic review investigated the effectiveness and safety of pharmacotherapy in frail older adults with T2DM.

Material and methods

Randomized (RCT) and non-randomized prospective clinical trials (non-RCT) were searched in three electronic databases (Medline, Embase, Central) up to October 2018. Trials in older adults with T2DM who were assessed as significantly or severely impaired by defined cut-off scores of assessment instruments on frailty, activities of daily living or physical functional impairment were included.

Results

Two reviewers independently screened 17,391 references for inclusion and assessed risk of bias with ROBINS‑I. Five non-RCTs and no RCT were identified. Treatment of T2DM without insulin compared to insulin could be associated with increased improvement in cardiac functions in patients with cardiac resynchronization therapy and with decreased falls in frail older women. While better glycemic control with low variability and low HbA1c (hemoglobin A1c) values (<7%) was associated with better maintenance of physical function in community-dwelling older persons, higher HbA1c values (8–8.9%) were associated with a reduction in the composite outcome of death or functional decline in community-dwelling diabetic older adults with need for skilled assistance. Due to serious risk of bias in all studies, results should be considered with caution.

Conclusion

Well-designed, large-scale RCTs including this important group of patients are required to assess the effectiveness and safety of pharmacotherapy and HbA1c targets.

Electronic supplementary material

The online version of this article (10.1007/s00391-020-01724-3) contains supplementary material, which is available to authorized users.

Transcranial Electric Current Stimulation During Associative Memory Encoding: Comparing tACS and tDCS Effects in Healthy Aging

Associative memory is one of the first cognitive functions negatively affected by healthy and pathological aging processes. Non-invasive brain stimulation (NIBS) techniques are easily administrable tools to support memory. However, the optimal stimulation parameters inducing a reliable positive effect on older adult’s memory performance remain mostly unclear. In our randomized, double-blind, cross-over study, 28 healthy older adults (16 females; 71.18 + 6.42 years of age) received anodal transcranial direct (tDCS), alternating current in the theta range (tACS), and sham stimulation over the left ventrolateral prefrontal cortex (VLPFC) each once during encoding. We tested associative memory performance with cued recall and recognition tasks after a retention period and again on the following day. Overall, neither tDCS nor tACS showed effects on associative memory performance. Further analysis revealed a significant difference for performance on the cued recall task under tACS compared to sham when accounting for age. Our results suggest that tACS might be more effective to improve associative memory performance than tDCS in higher aged samples.

Entrustable Professional Activities in Psychiatry: A Systematic Review

OBJECTIVE

Entrustable professional activities (EPAs) represent discrete clinical tasks that can be entrusted to trainees in psychiatry. They are increasingly being used as educational framework in several countries. However, the empirical evidence available has not been synthesized in the field of psychiatry. Therefore, the authors conducted a systematic review in order to summarize and evaluate the available evidence in the field of EPAs in undergraduate and graduate medical education in psychiatry.

METHODS

The authors searched PubMed, Cochrane Library, ERIC, Embase, PsycINFO, all Ovid journals, Scopus, Web of Science, MedEdPORTAL, and the archives of Academic Psychiatry for articles reporting quantitative and qualitative research as well as educational case reports on EPAs in undergraduate and graduate psychiatry education published since 2005. All included articles were assessed for content (development, implementation, and assessment of EPAs) and quality using the Quality Assessment Tool for Studies with Diverse Designs.

RESULTS

The authors screened 2807 records and included a total of 20 articles in the final data extraction. Most studies were expert consensus reports (n = 6, 30%) and predominantly conducted in English-speaking countries (n = 17, 85%). Papers reported mainly EPA development and/or EPA implementation studies (n = 14, 70%), whereas EPA assessment studies were less frequent (n = 6, 30%). Publications per year showed an increasing trend both in quantity (from 1 in 2011 to 7 in 2018) and quality (from a QATSDD score of 27 in 2011 to an average score of 39 in 2018). The main focus of the articles was the development of individual EPAs for different levels of training for psychiatry or on curricular frameworks based on EPAs in psychiatry (n = 10, 50%). The lack of empirical controlled studies does currently not allow for meta-analyses of educational outcomes.

CONCLUSIONS

The concept of EPA-based curricula seems to become increasingly present, a focus in the specialty of psychiatry both in UME and GME. The lack of empirical research in this context is an important limitation for educational practice recommendations. Currently there is only preliminary but promising data available for using EPAs with regard to educational outcomes. EPAs seem to be effectively used from a curriculum design perspective for UME and GME in psychiatry.

MRI-based prediction of conversion from clinically isolated syndrome to clinically definite multiple sclerosis using SVM and lesion geometry

Neuroanatomical pattern classification using support vector machines (SVMs) has shown promising results in classifying Multiple Sclerosis (MS) patients based on individual structural magnetic resonance images (MRI). To determine whether pattern classification using SVMs facilitates predicting conversion to clinically definite multiple sclerosis (CDMS) from clinically isolated syndrome (CIS). We used baseline MRI data from 364 patients with CIS, randomised to interferon beta-1b or placebo. Non-linear SVMs and 10-fold cross-validation were applied to predict converters/non-converters (175/189) at two years follow-up based on clinical and demographic data, lesion-specific quantitative geometric features and grey-matter-to-whole-brain volume ratios. We applied linear SVM analysis and leave-one-out cross-validation to subgroups of converters (n = 25) and non-converters (n = 44) based on cortical grey matter segmentations. Highest prediction accuracies of 70.4% (p = 8e-5) were reached with a combination of lesion-specific geometric (image-based) and demographic/clinical features. Cortical grey matter was informative for the placebo group (acc.: 64.6%, p = 0.002) but not for the interferon group. Classification based on demographic/clinical covariates only resulted in an accuracy of 56% (p = 0.05). Overall, lesion geometry was more informative in the interferon group, EDSS and sex were more important for the placebo cohort. Alongside standard demographic and clinical measures, both lesion geometry and grey matter based information can aid prediction of conversion to CDMS.

[Recognition of Psychiatric Symptoms in Inpatient Long-Term Care]

Recognition of Psychiatric Symptoms in Inpatient Long-Term Care Abstract. As part of the Swiss national strategy on dementia, we investigated to which extent the needs assessment instruments RAI and BESA can early detect symptoms of depression, delirium, and behavioral and psychological symptoms of dementia (BPSD) in long-term care facilities. While we decided that the RAI sufficiently detected depressive symptoms, we suggest to add the two-questions-test and the geriatric depression scale to the BESA assessment. The BESA evaluation had more targeted focused assessments, allowing for better identification of delirium. Neither RAI or BESA cover the whole spectrum of behavioral and psychological symptoms of dementia. We consider the continuous application of these assessment instruments an important step towards interdisciplinary exchange and a better treatment of residents with psychiatric symptoms.

Are Patients with Subclinical Hypothyroidism at Risk of Depressive Symptoms?

Introduction

Subclinical hypothyroidism (SHypo) may be associated with negative health outcomes including depressive symptoms. However, the evidence is conflicting.

Methods

We conducted a systematic review and individual participant data (IPD) meta-analysis to assess the association between SHypo and depressive symptoms. We requested IPD from cohorts identified through a systematic literature search. The exposure was thyroid function at baseline (SHypo vs. euthyroid; SHypo defined as thyroid stimulating hormone ≥ 4.5 mlU/L, in combination with normal free thyroxine). The outcome was depressive symptoms at first follow-up, measured on any validated scale. We calculated conversion factors to convert all scores into the Beck Depression Inventory (BDI) scale (range: 0-63, higher scores indicate more depression, minimal clinically important difference: 5). We performed a two-stage IPD meta-analysis. In each cohort, we estimated the mean difference (MD) in depressive symptoms scores between those with SHypo and euthyroid controls adjusted for depressive symptoms at baseline. Further, we adjusted the multivariable linear regression analysis for age, sex, education, and income. We pooled the study effect estimates by using a random effects model. Heterogeneity was assessed by I2.

Results

Among six cohorts, we analyzed data from 23,367 participants (65% female, mean age 60.3±13.2 years, SHypo N = 1,463). There was no difference in BDI scores between SHypo (10.6) and controls (10.2) at baseline. After a mean follow-up of 8.2±4.3 years, BDI scores did not differ between SHypo and controls (pooled MD 0.3, 95% CI -0.2 to 0.7, I2 14%). Results remained robust in several sensitivity analyses, and no subgroup at increased risk for depressive symptoms could be identified.

Conclusions

In this IPD meta-analysis, SHypo was not associated with the development of depressive symptoms. Depressive symptoms do not seem to be an indication for levothyroxine therapy in SHypo.

PROSPERO: CRD42018091627

Key messages

Individual studies about the association between subclinical hypothyroidism and depressive symptoms show conflicting results. In this IPD meta-analysis from six prospective cohort studies, patients with subclinical hypothyroidism did not have an increased risk to develop depressive symptoms during a mean follow-up of 8 years.

Reducing negative affect with anodal transcranial direct current stimulation increases memory performance in young-but not in elderly-individuals

Affect can directly influence memory storage and retrieval, which offers the opportunity to improve memory performance by changing affective responses. A promising target is the left dorsolateral prefrontal cortex (dlPFC), as it is functionally involved in both affect and memory. This study explores whether anodal transcranial direct current stimulation (tDCS) to the left dlPFC improves memory retrieval through the reduction of negative affect and if this interacts with age. We randomly assigned 94 healthy individuals (n = 43 young, n = 51 elderly) to either sham or active tDCS during encoding of a verbal episodic memory task. Participants completed two questionnaires assessing affective states pre- and post-stimulation. They had to recall items unexpectedly 20 min after encoding and to name which feelings were associated with this free recall. We applied mediation models to explore the relation between tDCS, change in affect, and memory retrieval. In young participants, the reduction of negative affect via anodal tDCS fully mediated the increase in memory retrieval (R² = 57%; p < 0.001); that is, a stronger reduction of negative affect via tDCS led to better memory performance. We did not observe these effects in the elderly. Our study provides a further link between affect and memory: as increased activity in the dlPFC is crucial for successfully coping with affective interference, anodal tDCS seems to help preventing irrelevant negative thoughts, thus foster attention allocation. Studies applying anodal tDCS to the left dlPFC in healthy young participants should consider changes in affect when interpreting the effect of stimulation on memory performance.

Determinants of Inter-Individual Variability in Corticomotor Excitability Induced by Paired Associative Stimulation

Transcranial magnetic stimulation (TMS) is a well-established tool in probing cortical plasticity in vivo. Changes in corticomotor excitability can be induced using paired associative stimulation (PAS) protocol, in which TMS over the primary motor cortex is conditioned with an electrical peripheral nerve stimulation of the contralateral hand. PAS with an inter-stimulus interval of 25 ms induces long-term potentiation (LTP)-like effects in cortical excitability. However, the response to a PAS protocol tends to vary substantially across individuals. In this study, we used univariate and multivariate data-driven methods to investigate various previously proposed determinants of inter-individual variability in PAS efficacy, such as demographic, cognitive, clinical, neurophysiological, and neuroimaging measures. Forty-one right-handed participants, comprising 22 patients with amnestic mild cognitive impairment (MCI) and 19 healthy controls (HC), underwent the PAS protocol. Prior to stimulation, demographic, genetic, clinical, as well as structural and resting-state functional MRI data were acquired. The two groups did not differ in any of the variables, except by global cognitive status. Univariate analysis showed that only 61% of all participants were classified as PAS responders, irrespective of group membership. Higher PAS response was associated with lower TMS intensity and with higher resting-state connectivity within the sensorimotor network, but only in responders, as opposed to non-responders. We also found an overall positive correlation between PAS response and structural connectivity within the corticospinal tract, which did not differ between groups. A multivariate random forest (RF) model identified age, gender, education, IQ, global cognitive status, sleep quality, alertness, TMS intensity, genetic factors, and neuroimaging measures (functional and structural connectivity, gray matter (GM) volume, and cortical thickness as poor predictors of PAS response. The model resulted in low accuracy of the RF classifier (58%; 95% CI: 42 - 74%), with a higher relative importance of brain connectivity measures compared to the other variables. We conclude that PAS variability in our sample was not well explained by factors known to influence PAS efficacy, emphasizing the need for future replication studies.