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This chapter provides an overview of chronic traumatic encephalopathy (CTE), a neurodegenerative disease associated with repetitive head trauma. It discusses the historical background of CTE, its neuropathology, clinical features, and epidemiology. The chapter also explores the current understanding of CTE staging and common co-pathologies. It highlights the challenges in diagnosing and monitoring CTE in living patients and the ongoing research efforts to develop biomarkers for early detection. The chapter concludes by discussing the prevention, treatment, and future directions in CTE research. It is important to recognize the risks of head trauma and implement measures to reduce the incidence of CTE and other neurodegenerative diseases associated with head trauma.
Alzheimer’s disease (AD) is the most common type of dementia, accounting for approximately 60% of dementia cases (either alone or in combination); vascular dementia (VaD) accounts for another 10–20%. Most epidemiologic research on dementia has examined prevalence, incidence, and risk factors for either all-cause dementia or AD. This chapter discusses the epidemiology of all-cause dementia and AD, as well as advancement in VaD-related risk factors. Numerous prospective, observational studies have identified a variety of factors that may prevent or delay dementia onset. To better understand the epidemiology of dementia and the potential benefits of implementing interventions, future studies need to address the life course and long preclinical aspects of this disorder. More work is needed to understand the epidemiology and risk factors for non-AD or VaD dementias.
Corticobasal degeneration (CBD) and progressive supranuclear palsy (PSP) are neurodegenerative diseases associated with tau protein abnormalities. CBD is characterized by asymmetric parkinsonism, apraxia, and cognitive and behavioral symptoms. PSP is characterized by supranuclear gaze palsy, postural instability, and cognitive and behavioral changes. Both diseases have heterogeneous clinical presentations and can be difficult to diagnose. There are currently no disease-modifying treatments available for CBD or PSP, but symptomatic relief can be provided through medications and therapy. Research is ongoing to develop biomarkers and therapies for these diseases.
Alzheimer’s disease (AD) is the most common type of dementia, accounting for approximately 60% of dementia cases (either alone or in combination); vascular dementia (VaD) accounts for another 10–20%. Most epidemiologic research on dementia has examined prevalence, incidence, and risk factors for either all-cause dementia or AD. This chapter discusses the epidemiology of all-cause dementia and AD, as well as advancement in VaD-related risk factors. Numerous prospective, observational studies have identified a variety of factors that may prevent or delay dementia onset. To better understand the epidemiology of dementia and the potential benefits of implementing interventions, future studies need to address the life course and long preclinical aspects of this disorder. More work is needed to understand the epidemiology and risk factors for non-AD or VaD dementias.
Mental health issues are prevalent among children and young people (CYP) with chronic conditions like epilepsy, yet few access evidence-based psychological therapies. Evidence from the Mental Health Intervention for Children with Epilepsy (MICE) trial supports the effectiveness of a personalised modular psychological intervention, but cost-effectiveness is unknown.
Aims
To assess the cost-effectiveness of the MICE intervention compared with assessment-enhanced usual care at 12-months follow-up, taking a health and social care perspective.
Method
We conducted a within-trial economic evaluation. Outcomes were the Strengths and Difficulties Questionnaire (SDQ; primary) and quality-adjusted life years (QALYs; secondary) for CYP, caregivers, and CYP and caregivers combined. Sensitivity analyses examined missing data and intervention-costing assumptions.
Results
Cost-effectiveness results for the SDQ indicated that MICE had a higher probability of being cost-effective compared with control at a willingness to pay ≥£368 per unit improvement. For QALYs, MICE had a lower probability of being cost-effective for CYP compared with control (35 to 42%) across the £20 000–£30 000 per QALY threshold range. However, at the upper threshold this finding was reversed in sensitivity analyses with missing data imputed (45 to 58%) and with MICE costed at 75%, assuming the intervention partly substituted standard services (46 to 55%). Furthermore, MICE had a higher probability of being cost-effective for caregiver QALYs (52 to 63%) and combined CYP and caregiver QALYs (62 to 75%).
Conclusions
MICE appears to be cost-effective compared with assessment-enhanced usual care when considering QALYs for CYP and caregivers combined, though uncertainty exists across willingness-to-pay thresholds.
Internationally, drug- and alcohol-related morbidity is at its highest recorded levels yet these modifiable risk factors often remain overlooked within systems of healthcare delivery and research. We seek to reaffirm the ongoing commitment of BJPsych to publishing and promoting drug and alcohol research and encourage submission of high-quality articles.
Eating disorders, particularly anorexia nervosa and bulimia nervosa, are significant global health challenges.
Aims
This study analyses historical trends and forecasts future patterns of eating disorders among young adults aged 15–29 years using machine learning techniques.
Method
Global data on anorexia nervosa and bulimia nervosa from the Global Burden of Disease study 2021 spanning 1990 to 2021 were analysed, examining incidence, prevalence and disability-adjusted life years (DALYs) across age groups, sociodemographic index (SDI) levels and regions. Eight machine-learning models were employed to forecast trends from 2022 to 2050.
Results
Bulimia nervosa showed more pronounced increases compared to anorexia nervosa across all metrics. The 15–19 age group had the highest incidence rates, while the 20–24 age group showed the highest prevalence and DALY rates. Low SDI regions experienced substantial increases, with bulimia nervosa prevalence rising by 179.05%. East Asia demonstrated the most significant rise in age-standardised rates. The Prophet model best forecast anorexia nervosa trends, while ARIMA performed best for bulimia nervosa. Projections indicate continued increases through 2050 for both disorders.
Conclusions
The global burden of eating disorders among young adults is projected to increase significantly by 2050, with bulimia nervosa showing more rapid growth than anorexia nervosa. Substantial variations exist across age groups, SDI levels and regions. These findings highlight the urgent need for enhanced prevention programmes targeting high-risk age groups, strengthened healthcare capacity in rapidly developing regions and evidence-based policy interventions to address the growing global burden of eating disorders.
Most people who develop dementia will never be diagnosed, and therefore lack access to treatment and care from specialists in the field. This new edition provides updated guidance on how behavioral symptom reflect the changes occurring in the brain, and how these can help generalist clinicians to accurately diagnose neurodegenerative diseases. This practical book is aimed at healthcare professionals working in neurology, psychiatry and neuropsychology wanting to enhance the skills and knowledge needed to successfully manage these diseases. Simple approaches to bedside mental status testing, differential diagnosis and treatment, and interpreting neuropsychological testing and neuroimaging findings are covered. Introductory chapters outline dementia epidemiology and dementia neuropathology whilst chapters new to this edition describe the improvements in diagnostic capabilities in recent years, including blood based and cerebrospinal biomarkers and emerging biologically based therapies. Chapters on sleep disorders, and chronic traumatic encephalopathy and traumatic brain injury have also been expanded.
This paper is interested in the spread of an autocratic ideology and the emergence of a societal belief. It is often assumed that the greater the capacities of an autocratic regime to inculcate an ideological belief into the minds and hearts of subordinate citizens, the more an autocratic ideology is shared in a given society. The extent of an ideological belief is explained by a direct and immediate function of its indoctrination capacities. The paper does not question this top–down, macro–micro approach, but argues that the spread of an ideology also depends on stabilizing micro–micro interactions and micro–macro linkages. In this light, the paper makes use of James Coleman’s famous explanatory model and theorizes the different partial mechanisms. It pays particular emphasis on the micro–macro mechanism. Borrowing insights from epidemiology, it argues that three classes of parameters should be taken into closer consideration: timing, contact structure, and the contagiousness of an ideology. In empirical terms, the paper illustrates its theoretical reasoning with the dissemination of the North Korean Juche ideology from the 1950s to the early 1970s, which represents an extreme case of a rapidly ideologizing autocracy. The paper relies on secondary sources as well as archival material retrieved from the former embassy of the German Democratic Republic in Pyongyang.
The epidemiology of psychiatric disorders among young people is a topic often discussed within the media. However, the reported prevalence of child and adolescent psychiatric disorders depends upon the sample studied, temporal context and methodology used. Within the UK, the use of large, methodologically rigorous surveys has improved understanding of disorders at a population level. The findings paint a solemn picture with 1 in 8 young people found to have a diagnosable mental disorder in 2017 and follow ups in 2020 and 2021 suggesting this may have increased to 1 in 6. The main drivers in these increases appear to be a rise in emotional disorders, particularly in older adolescents and most strikingly among females. Other disorders, when compared across timepoints, appear to have remained relatively stable in prevalence. The classification of disorders within child and adolescent psychiatry is also an ever-evolving field with changes made in each new diagnostic manual which reflect current thinking and the incorporation of new knowledge. This chapter discusses recent changes to the classifications of disorders in child and adolescent mental health and recent epidemiological findings.
This chapter reviews a broad spectrum in Child and Adolescent Mental Health; that of the anxiety disorders. The chapter briefly introduces the concept of attachment and touches on how attachment disorders, and attachment styles evolve. It focuses in on PTSD and C-PTSD, with a particular spotlight on C-PTSD as a new diagnostic concept, and considers its importance in understanding presentations of trauma and emotional dysregulation in children and young people. The chapter also investigates the epidemiology and course of anxiety disorders; and considers the differentiating features of the different presentations. We finish with an overview of interventions, including the rise of computerised approaches in treating the anxiety disorders in young people.
A survey found that 1 in 6 (16%) of children aged between 5 and 16 years has a probable mental illness. Furthermore, research has shown that most of these disorders have their origins in childhood, even if they are typically diagnosed in adulthood. Childhood represents a critical period of physical, cognitive, psychological, behavioural and social transformation. Identifying risk and protective factors that alter the typical developmental trajectory could have long-term educational, social, societal and economic implications. This chapter will address what is meant by the term risk factor and how these can be identified, provide examples of risk factors thought to be important in child and adolescent psychiatry. It concludes with some case vignettes to highlight the importance of taking a developmental biopsychosocial approach to identifying risk, considering predisposing, precipitating, perpetuating and protective factors.
Gender diversity is relatively common in youth, with rates increasing in the general population. This increase may be related to decreased stigma in gender expression, adolescent experimentation, environmental factors or due to the recent interest in quantitatively measuring this trait. Gender diversity in and of itself is a not a psychiatric disorder. But mental health providers might see gender diverse youth if there is the desire for gender-affirming treatment, for assessing and treating of co-occurring psychiatric disorders or to promote resilience in situations where bullying and stigmatisation are taking place. As such, clinicians should be prepared to provide a confidential and competent environment that recognises the vast range of gender diversity currently seen in youth. In addition, while research on mental health in gender diverse youth has substantially expanded in the past decade, limitations of these data influence interpretation and generalisability. Well-designed studies should address gaps, such as long-term follow-up periods for gender diverse youth and those who have received gender affirmative care. They should also examine developmental trajectories and the stability of gender identity. Gender diversity in racial and ethnic minorities who may have different psychiatric presentations should also be addressed in future research.
Giardiasis is the most common enteric protozoan infection notifiable in New South Wales (NSW), Australia. Surveillance by NSW Health had shown a steady increase (prior to the COVID-19 pandemic) in the number of cases reported since 2012 and the reasons for this currently remain unknown. This study aimed to investigate the occurrence of Giardia intestinalis assemblages causing human infection in NSW. Individual faecal specimens were collected from participating hospitals and private laboratories, and the presence of Giardia and co-infections was confirmed by real-time multiplex-polymerase chain reaction (PCR). Samples were genotyped by sequence analysis of the triose phosphate isomerase (tpi) gene and the small subunit rDNA. Combined genotyping showed that most samples belong to assemblage B, and only a small percentage were infected with only assemblage A. Mixtures of assemblages A and B in individuals were relatively common. Co-infections were observed in ∼ half of the cases, with the most common co-infection being Blastocystis hominis and Dientamoeba fragilis. Although giardiasis was more prevalent in males, the assemblage distribution between the sexes appeared uniform. The age distribution was bimodal, with peaks in 0–15-year-olds and in adults in their 30s. The overall largest number of cases was collected from patients aged 30–49 years. Interestingly, females aged 5 years old and under had a greater risk of assemblage B infection than their male counterparts. No significant correlation was found between assemblage and clinical symptoms. This study provides new insights into the molecular diversity of giardiasis in NSW and helps inform enhanced surveillance and prevention strategies in Sydney.
Various key events characterise experiences in later life, such as retirement, bereavement, caregiving, developing long-term conditions and hospital admission. Given their potential to disrupt lives, such events may affect older people’s mental health, but research on the associations between such events and depression has produced inconsistent findings.
Aims
To investigate the impact of key events in later life on depression trajectories in a representative cohort of people aged 50–69 in England.
Method
Our sample draws on 6890 respondents aged 50–69 in Wave 1 (2002/2003) of the English Longitudinal Study of Ageing, following them through to Wave 9 (2018/2019). We measured depression using the eight-item Center for Epidemiological Studies Depression scale. Later life events included retirement, spouse/partner death, becoming an unpaid caregiver, developing a limiting long-term illness and hospital admissions because of a fall or non-fall causes. Piecewise mixed-effects logistic regression models tested for changes in the trajectories of depression before and after each event.
Results
Statistically significant improvements in the trajectory of depression were observed following spousal bereavement, one’s own retirement and hospital admission because of causes other than falls, with reductions in the odds of depression of 48% (odds ratio: 0.52 (95% CI: 0.44–0.61)), 15% (0.85 (0.78–0.92)) and 4% (0.96 (0.94–0.99)), respectively. No changes were associated with developing a limiting long-term illness, becoming an unpaid caregiver or following spousal retirement or a hospital admission because of a fall.
Conclusions
The findings highlight the relative resilience among older adults in England in terms of depression following key later life events. There is still a role to play in delivering mental health support for older people following such events, particularly by improving the identification of those at risk of certain events as part of a broader strategy of prevention. Findings also underscore the importance of partner/spousal circumstances on individual mental health.
To examine whether unconscious and systemic biases regarding ethnicity have an impact on equity of access to a national tic service for children and young people (CYP) at Great Ormond Street Hospital for Children, London, UK. We retrospectively reviewed triaged referrals over an 18-month period and examined differences in triage decision, re-referrals required before acceptance and symptom severity at initial assessment by clinician-perceived and self-assigned ethnicity.
Results
There was no evidence of an unconscious bias within the triage process. CYP from racially minoritised ethnic backgrounds were underrepresented and presented with greater overall need at initial assessment.
Clinical implications
Better recording of ethnicity is a requisite starting point for research. We encourage local services to audit ethnicity of the CYP they refer to national and specialist services. Findings call for greater awareness of challenges faced by patients from racially minoritised ethnic backgrounds.
Schizophrenia is associated with premature mortality, but most evidence comes from high-income regions.
Aims
This study aimed to estimate the excess mortality associated with schizophrenia in southern China.
Method
We linked register data from a nationwide information system for psychosis to death registers. Individuals diagnosed with schizophrenia and residing in Guangzhou between 2014 and 2021 were included. Standardised mortality ratios (SMRs) were calculated to compare the mortality of people with schizophrenia with that of the general population. Life expectancy, potential years of life lost (PYLL) and years of life lost (YLL) were estimated for all-cause mortality and specific causes of death. Gender difference in these metrics was examined.
Results
There were 3684 deaths (11.3%) during the study period. The leading causes of death were circulatory, neoplastic and respiratory diseases. The mortality rate among people with schizophrenia was twofold greater than in the general population, with a greater risk associated with unnatural causes than natural causes. The risk of mortality due to suicide was 15-fold higher than that of the general population. The life expectancy in schizophrenia was around 60 years, which is 21 years shorter than that for the general population. Schizophrenia was associated with substantial premature mortality burden, showing greater impact in men than women.
Conclusions
Schizophrenia is associated with increased premature mortality, reduced life expectancy and substantial PYLL. The enduring disparity in mortality underscores an imminent call for targeted interventions aimed at suicide prevention and enhancement of the physical well-being of people with schizophrenia.
The aim of this study is to determine the prevalence and type of mental disorders associated with pathological gambling/gambling disorder (GD) in the general population.
Methods
Systematic review and meta-analysis of adult population-based studies reporting on psychiatric comorbidity of GD according to International Classification of Diseases (ICD-10/ICD-11), Diagnostic and Statistical Manual of Mental Disorders (DSM-IV/DSM-5) criteria, or widely used assessment instruments. PubMed, Scopus, and Web of Science databases were searched for relevant studies in English. The study’s protocol was preregistered in PROSPERO (CRD42024574210).
Results
Of 454 articles published between 1993 and 2024, 12 met the inclusion criteria. Most studies used DSM-IV or DSM-5 criteria (only two ICD-10 criteria), and were evenly distributed across Europe, North America, and Southeast Asia. The weighted average prevalence of any mental disorder in individuals with GD was 82.2%. High comorbidity rates were found for substance use disorders (SUDs) (34.2%), mood disorders (30.9%), and anxiety disorders (29.9%), followed by personality (14.3%) and psychotic (5.9%) disorders. Meta-analysis indicates that individuals with GD are 10.7 (95% confidence interval [CI]: 5.7;20.1) times more likely to develop any mental disorder than the general population. The odds ratio for mental disorders associated with GD were 5–12 times higher for nicotine dependence, drug use disorder, alcohol use disorder, and SUD, and 3–4 times higher for anxiety and mood disorders.
Conclusions
These findings add weight to the view that GD is associated with a significantly increased risk for addictive behaviors, mood, and anxiety disorders.