Perceived impacts of stressful events on train driver performance.

Acute stress exposure can significantly impact a train driver's capacity to maintain safe train operations. However, research examining how train drivers perceive the impacts of acute stressors is limited. This study investigated train driver perceptions regarding performance impacts of stressful events and potential strategies for reducing negative impacts. 71 Australian train drivers were presented with three stressful event scenarios via an online survey and asked to rate the impacts on driving performance. Results showed that participants perceived that stress would enhance performance, but that impacts differed depending on the event type. The findings suggest that train drivers may not be subjectively aware of negative impacts of acute stress, which has important practical implications for risk management following an incident. Qualitative results revealed the most frequently reported stress impact related to cognition. Practical implications and future research directions to prevent and manage stressful event exposure are discussed.

Prodromal or mild Alzheimer's disease: Influence of neuropsychiatric symptoms and premordid personality on caregivers' burden.

OBJECTIVE: In Alzheimer's disease (AD), the burden on caregivers is influenced by various factors, including the stage of disease progression and neuropsychiatric symptoms (NPS). To date, there has been limited research examining how patient's premorbid personality could affect this burden. The objective of this study was to investigate the impact of both premorbid personality and NPS in individuals with prodromal to mild AD on their caregivers' burden. METHOD: One hundred eighty participants with prodromal or mild AD drown from the PACO (in French: Personnalité Alzheimer COmportement) cohort were included. Personality was assessed by the Revised NEO Personality Inventory (NEO-PI-R). Neuropsychiatric symptoms were measured with the short version of the Neuropsychiatric Inventory (NPI-Q), and caregiver burden was evaluated with the Zarit burden scale. Relationships between personality, Neuro-Psychiatric Inventory (NPI) scores, and caregiver burden were determined using multivariate linear regressions controlled for age, sex, educational level, and Mini Mental State Examination. RESULTS: The total NPI score was related to increased burden (beta = 0.45; p < 0.001). High level of neuroticism (beta = 0.254; p = 0.003) et low level of conscientiousness (beta = - 0.233; p = 0.005) were associated higher burden. Extraversion (beta = -0.185; p = 0.027) and conscientiousness (beta = -0.35; p = 0.006) were negatively associated with burden. In contrast, neuroticism, openness and agreeableness were not correlated with burden. When adjusted on total NPI score, the relationship between extraversion and conscientiousness didn't persist. CONCLUSION: Our results suggest that premorbid personality of patients with prodromal to mild Alzheimer influence caregivers's burden, with a protective effect of a high level of extraversion and conscientiousness.

The pattern of cortical thickness associated with executive dysfunction in MCI and SCC: The MEMENTO cohort.

BACKGROUND: The association between the pattern of cortical thickness (CT) and executive dysfunction (ED) in mild cognitive impairment (MCI) and subjective cognitive complaints (SCC) is still poorly understood. We aimed to investigate the association between CT and ED in a large French cohort (MEMENTO) of 2323 participants with MCI or SCC. METHODS: All participants with available CT and executive function data (verbal fluency and Trail Making Test [TMT]) were selected (n=1924). Linear regressions were performed to determine relationships between executive performance and the brain parenchymal fraction (BPF) and CT using FreeSurfer. RESULTS: The global executive function score was related to the BPF (sß: 0.091, P<0.001) and CT in the right supramarginal (sß: 0.060, P=0.041) and right isthmus cingulate (sß: 0.062, P=0.011) regions. Literal verbal fluency was related to the BPF (sß: 0.125, P<0.001) and CT in the left parsorbitalis region (sß: 0.045, P=0.045). Semantic verbal fluency was related to the BPF (sß: 0.101, P<0.001) and CT in the right supramarginal region (sß: 0.061, P=0.042). The time difference between the TMT parts B and A was related to the BPF (sß: 0.048, P=0.045) and CT in the right precuneus (sß: 0.073, P=0.019) and right isthmus cingulate region (sß: 0.054, P=0.032). CONCLUSIONS: In a large clinically based cohort of participants presenting with either MCI or SCC (a potential early stage of Alzheimer's disease [AD]), ED was related to the BPF and CT in the left pars orbitalis, right precuneus, right supramarginal, and right isthmus cingulate regions. This pattern of lesions adds knowledge to the conventional anatomy of ED and could contribute to the early diagnosis of AD.

Managing the risks associated with technological disruption in the road transport system: a control structure modelling approach.

Road transport is experiencing disruptive change from new first-of-a-kind technologies. While such technologies offer safety and operational benefits, they also pose new risks. It is critical to proactively identify risks during the design, development and testing of new technologies. The Systems Theoretic Accident Model and Processes (STAMP) method analyses the dynamic structure in place to manage safety risks. This study applied STAMP to develop a control structure model for emerging technologies in the Australian road transport system and identified control gaps. The control structure shows the actors responsible for managing risks associated with first-of-a-kind technologies and the existing control and feedback mechanisms. Gaps identified related to controls (e.g. legislation) and feedback mechanisms (e.g. monitoring for behavioural adaptation). The study provides an example of how STAMP can be used to identify control structure gaps requiring attention to support the safe introduction of new technologies.

This paper considers emerging risks associated with new technologies in the road transport system. It demonstrates a novel approach using STAMP to identify gaps in control and feedback mechanisms within the existing control structure which should be addressed to mitigate risk.

Forecasting emergent risks in advanced AI systems: an analysis of a future road transport management system.

Artificial Intelligence (AI) is being increasingly implemented within road transport systems worldwide. Next generation of AI, Artificial General Intelligence (AGI) is imminent, and is anticipated to be more powerful than current AI. AGI systems will have a broad range of abilities and be able to perform multiple cognitive tasks akin to humans that will likely produce many expected benefits, but also potential risks. This study applied the EAST Broken Links approach to forecast the functioning of an AGI system tasked with managing a road transport system and identify potential risks. In total, 363 risks were identified that could have adverse impacts on the stated goals of safety, efficiency, environmental sustainability, and economic performance of the road system. Further, risks beyond the stated goals were identified; removal from human control, mismanaging public relations, and self-preservation. A diverse set of systemic controls will be required when designing, implementing, and operating future advanced technologies.Practitioner summary: This study demonstrated the utility of HFE methods for formally considering risks associated with the design, implementation, and operation of future technologies. This study has implications for AGI research, design, and development to ensure safe and ethical AGI implementation.

Resolving trabecular metaphyseal bone profiles downstream of the growth plate adds value to bone histomorphometry in mouse models.

Introduction: Histomorphometry of rodent metaphyseal trabecular bone, by histology or microCT, is generally restricted to the mature secondary spongiosa, excluding the primary spongiosa nearest the growth plate by imposing an 'offset'. This analyses the bulk static properties of a defined segment of secondary spongiosa, usually regardless of proximity to the growth plate. Here we assess the value of trabecular morphometry that is spatially resolved according to the distance 'downstream' of-and thus time since formation at-the growth plate. Pursuant to this, we also investigate the validity of including mixed primary-secondary spongiosal trabecular bone, extending the analysed volume 'upstream' by reducing the offset. Both the addition of spatiotemporal resolution and the extension of the analysed volume have potential to enhance the sensitivity of detection of trabecular changes and to resolve changes occurring at different times and locations. Method: Two experimental mouse studies of trabecular bone are used as examples of different factors influencing metaphyseal trabecular bone: (1) ovariectomy (OVX) and pharmacological prevention of osteopenia and (2) limb disuse induced by sciatic neurectomy (SN). In a third study into offset rescaling, we also examine the relationship between age, tibia length, and primary spongiosal thickness. Results: Bone changes induced by either OVX or SN that were early or weak and marginal were more pronounced in the mixed primary-secondary upstream spongiosal region than in the downstream secondary spongiosa. A spatially resolved evaluation of the entire trabecular region found that significant differences between experimental and control bones remained undiminished either right up to or to within 100 µm from the growth plate. Intriguingly, our data revealed a remarkably linear downstream profile for fractal dimension in trabecular bone, arguing for an underlying homogeneity of the (re)modelling process throughout the entire metaphysis and against strict anatomical categorization into primary and secondary spongiosal regions. Finally, we find that a correlation between tibia length and primary spongiosal depth is well conserved except in very early and late life. Conclusions: These data indicate that the spatially resolved analysis of metaphyseal trabecular bone at different distances from the growth plate and/or times since formation adds a valuable dimension to histomorphometric analysis. They also question any rationale for rejecting primary spongiosal bone, in principle, from metaphyseal trabecular morphometry.

[Importance of cognitive disorders in internal medicine: Pathophysiology, diagnosis, management. The example of systemic lupus erythematosus]. / Importance des troubles cognitifs en médecine interne : physiopathologie, évaluation, prise en charge. L'exemple du lupus systémique.

Systemic diseases, which are in France mainly monitored in internal medicine, affect multiple organs or tissues. While cutaneous or articular manifestations are the most common, neurological involvement is often associated with severity. Diagnosis of peripheral (e.g, neuropathies) or central (e.g, myelitis) nervous disorders is quite easy through clinical examination and dedicated complementary tests. However, neuropsychological manifestations that affect cognition, including memory, attention, executive functions or reasoning, are difficult to diagnose, sometimes trivialized by practitioners. Their causes are often numerous and interrelated. Nevertheless, these cognitive manifestations are closely related to patients' quality of life, affecting their social life, family dynamics and professional integration but also the treatment adherence. The purpose of this review, focused on the example of systemic lupus erythematosus, is to raise awareness of cognitive dysfunction in systemic diseases including their management from diagnosis to treatments. The final aim is to go further into setting up research groups and care programs for patients with cognitive impairment followed in internal medicine.

The scope for adaptive capacity in emergency departments: modelling performance constraints using control task analysis and social organisational cooperation analysis.

Patient flow between the emergency department (ED) and hospital wards becomes problematic when bed availability is limited. To better understand the constraints that shape patient flow and everyday work in the ED, we applied Control Task Analysis (i.e. Contextual Activities Template, CAT) and Social Organisational Cooperation Analysis (SOCA) phases from the Cognitive Work Analysis framework to identify ways in which to optimise patient flow. The model and analysis were created through observations in the ED of clinicians (e.g. nurses, doctors), and professional staff (e.g. ward personnel, clerks). The CAT and SOCA-CAT models illustrate workspaces, patient journey phases, and patient volume within the department that are heavily loaded with tasks and human and non-human agents performing these tasks, while others are underutilised. The findings suggest that an ED's adaptive capacity could be strengthened through the integration of additional human and non-human agents allowing the redistribution of clinical and non-clinical tasks. Practitioner Summary: Workflow in EDs is constrained by uneven geographical distribution of activities, insufficient adaptive support during critical patient journey phases and periods of high patient volume. Adaptive capacity could be strengthened by additional human and non-human agents in combination with a redistribution of tasks, supporting seamless successful structural and behavioural adaptation in ED.

Using human factors and ergonomics methods to challenge the status quo: Designing for gender equitable research outcomes.

There have been recent calls for Human Factors and Ergonomics (HFE) to expand its reach and focus to address larger scale societal and global issues. An area of growing awareness is the issue of the gender data gap, whereby women are under-represented in research data, leading to inequitable outcomes when research findings are used to design real world technologies, products, environments, processes, and policies. The aim of this paper is to showcase how structured HFE methods can be used to address the gender data gap. We applied the Sociotechnical Systems Design Toolkit which involved using causal loop diagrams and abstraction hierarchy modelling from Cognitive Work Analysis to understand the system in which the issue occurs and key pain points, followed by the application of the Design with Intent Toolkit to generate design ideas. A total of 43 ideas were developed that could be implemented by universities to address the research data gap. The application demonstrates the utility of HFE methods in tackling complex issues and offers an opportunity for the HFE community to reflect upon the importance of gender sensitive research practices and gender equity more broadly.

Determinants of Medical Direct Costs of Care among Patients of a Memory Center.

BACKGROUND: Alzheimer's disease and related diseases (ADRD) are a major cause of health-related cost increase. OBJECTIVES: This study aimed to estimate the real medical direct costs of care of patients followed at a memory center, and to investigate potential associations between patients' characteristics and costs. DESIGN: Cross-sectional analyses conducted on matched data between clinical data of a cohort of patients and the claims database of the French Primary Health Insurance Fund. SETTING: Memory center in France. PARTICIPANTS: Patients attending a memory center with subjective cognitive complaint. MEASUREMENTS: Medical or nonmedical direct costs (transportation) reimbursed by the French health insurance during the one year after the first memory visit, and socio-demographic, clinical, cognitive, functional, and behavioral characteristics were analyzed. RESULTS: Among 2,746 patients (mean ± SD age 79.9 ± 8 years, 42.4% of patients with dementia), the total direct cost was on average € 9,885 per patient during the year after the first memory visit: € 7,897 for patients with subjective cognitive complaint, € 9,600 for patients with MCI, and € 11,505 for patients with dementia. A higher functional and cognitive impairment, greater behavioral disorders, and a higher caregiver burden were independently associated with a higher total direct cost. A one-point decrease in the Instrumental Activities of Daily Living score was associated with a € 1,211 cost increase. The cost was higher in patients with Parkinson's disease, and Lewy body disease compared to patients with AD. Diabetes mellitus, anxiety disorders and number of drugs were also significantly associated with greater costs. CONCLUSIONS: Higher real medical direct costs were independently associated with cognitive, functional, and behavioral impairment, diabetes mellitus, anxiety disorders, number of drugs, etiologies as well as caregiver burden in patients attending a memory center. The identification of factors associated to higher direct costs of care offers additional direct targets to evaluate how interventions conducted in patients with NCD impact direct costs of care.

Specificities of acute phase stroke management in the elderly.

Health professionals are currently facing the challenge of managing an increasing number of old patients presenting with acute stroke, due to rapid aging of the population. Compared to their younger counterparts, elderly patients differ in many ways in the setting of acute stroke. Apart from a striking high stroke incidence, which increases exponentially as age increases, cardioembolism also becomes, as patients age, the main cause of ischemic stroke. Delirium, which can challenge the diagnosis, is frequent at the acute phase of stroke, and may be related to an underlying dementia, which is almost exclusively observed in the elderly during stroke. At all levels, management of elderly stroke patients is suboptimal, especially when they are cognitively impaired, with insufficiencies including admission to stroke units, applying standards of care and investigation, reperfusion therapy for ischemic stroke, and finally transfer to rehabilitation centers. A paradigm shift must take place to limit age-related discrimination for acute-phase management of stroke.

[White matter hyperintensities in ageing: Pathophysiology, associated cognitive disorders and prevention]. / Hypersignaux de la substance blanche chez la personne âgée : physiopathologie, troubles cognitifs associés et pistes de prévention.

White matter hyperintensities (WMH), also known as leukoaraïosis are very common neuroradiological manifestations in the elderly. The main risk factors for WMH are age and high blood pressure. The vascular origin of these lesions is classically accepted and WMH are considered as one feature of the small vessel disease. WMH may be associated with clinical symptoms, depending notably on their importance according to age. They are associated with increased mortality, strokes and changes in cognition with a higher risk of dementia (vascular dementia or Alzheimer's disease). Modification of vascular risk factors could have a beneficial effect, but few evidences from controlled trials are available.

[Medication management of hypertension and heart failure in older patients: What happens to therapeutic changes after hospitalization?] / Prise en charge médicamenteuse de l'hypertension artérielle et de l'insuffisance cardiaque chez la personne âgée : les modifications effectuées à l'hôpital sont-elles poursuivies en ville ?

PURPOSE: The objective of this study was to objectivize if the cardiovascular therapeutic changes performed during hospitalization of older patients with hypertension and/or heart failure (HF), were maintained in ambulatory 3 month after hospitalization. METHODS: This is a longitudinal study conducted in a geriatric unit. Patients over 65 years with hypertension and/or HF, who had at least one change in cardiovascular medicaton during hospitalization, and who accepted the 3-month follow-up were included in the longitudinal study. At admission, during hospitalization and 3 months after hospitalization data concerning cardiovascular medication were collected. RESULTS: During hospitalization, 142 (73.6%) patients had at least one change in hypertension and/or HF medication. Overall, 249 changes were performed. Forty-one patients received follow-up at 3 months. At 3 months, therapeutic changes were maintained by 48.8% of the general practitioners (n=20 patients). For the rest, 41.5% of the patients had benefited from new therapeutic changes (28 changes for 10 patients) and 9.7% of the general practitioners (n=4 patients) had restored the initial prescription before hospitalization. CONCLUSIONS: Medication review performed by geriatricians and pharmacists during hospitalization resulted in 249 changes. These changes aimed at limiting iatrogenic disease, by reducing overtreatment and potentially inappropriate prescriptions. Difficulties in the patient care continuity between the hospital and ambulatory setting have been identified.

Age-related increase in mitochondrial quantity may mitigate a decline in mitochondrial quality in red blood cells from zebra finches (Taeniopygia guttata).

Aging is typically associated with a decline in whole animal performance that ultimately contributes to death. It is suspected that a decline in ATP production leads to dysfunction in cellular processes, contributing to the decline in performance. Birds require large amounts of ATP to support physiological process, especially flight, which is one of the most energetically expensive forms of locomotion in the animal kingdom to sustain. Since the bulk of ATP production is coordinated through mitochondrial activity, we set out to explore mitochondrial function in young (~8 months) and old (~73 months) zebra finches (Taeniopygia guttata). We exploited the fact that avian red blood cells (RBCs) are nucleated and have functional mitochondria to explore the phenomenon of age-related decline in mitochondrial function without the need for terminal sampling. We found that RBCs from old zebra finches have lower flux control ratios (mitochondrial O2 consumption attributed to ATP production; 0.29-0.36-fold), exhibit higher respiration (1.4-fold), and significantly higher citrate synthase activity (1.4-fold) than young birds. Respiration rates normalized to citrate synthase activity suggest that mitochondrial quality is changing, as leak state is significantly lower (0.39-fold) in old zebra finches in comparison to young animals. Overall, our findings indicate a possible change in the function of mitochondria in older zebra finches, which may be associated with a corresponding increase in mitochondrial quantity, possibly to offset a decline in mitochondrial quality.

A qualitative study of the processes by which carers of people with dementia derive meaning from caring.

BACKGROUND: Most individuals with dementia live in the community, receiving care from family or lay carers. Carers' wellbeing, and the quality of the care they provide, partly depends on their ability to derive meaning from caring for someone with dementia. Both carers' previous relationship with their relative and the caregiving process itself contribute to this sense of meaning. However, it remains unclear why some carers derive meaning from these sources, whereas others do not. OBJECTIVE: To further explore the processes by which carers derive a sense of meaning from caring. METHODS: Representative case sampling was used to recruit a purposive sample of 20 carers for individuals living with dementia. In-depth semi-structured interviews were audio-recorded and transcribed, and analysed using pluralist qualitative methodology. RESULTS: A framework of three sources from which carers derived meaning from caring was identified, encompassing: carers' perceptions of how 'right' or 'symmetrical' caring felt in light of their current and previous relationship with the person with dementia; maintenance of a 'protected' sense of self within the care relationship; and carers' perceptions of their 'social connectedness' outside the relationships. CONCLUSION: Holistic assessment based on this framework could help to tailor individualised provision of support, foster resilience and safeguard carers' well-being.