The categorisation of personality pathology into discrete disorders has been an enduring standard. However, dimensional models of personality are becoming increasingly prominent, in part owing to their superior validity and clinical utility. We contend that dimensional models also offer a unique advantage in treating mental illness. Namely, psychotherapy approaches and the components of dimensional models of personality can both be arranged hierarchically, from general to specific factors, and aligning these hierarchies provides a sensible framework for planning and implementing treatment. This article begins with a brief review of dimensional models of personality and their supporting literature. We then outline a multidimensional framework for treatment and present an illustrative fictitious clinical case before ending with recommendations for future directions in the field.

Why is parenting in adolescence predictive of maladaptive personality in adulthood? This study sets out to investigate environmental and genetic factors underlying the association between parenting and maladaptive personality longitudinally in a large sample of twins. The present study addressed this question via a longitudinal study focused on two cohorts of twins assessed on aspects of perceived parenting (parent- and adolescent-reported) at age 14 years (n =1,094 pairs). Participants were followed to adulthood, and maladaptive personality traits were self-reported using the Personality Inventory for DSM-5 (PID-5) at age 24 or 34 years. We then modeled these data using a bivariate biometric model, decomposing parenting-maladaptive personality associations into additive genetic, shared environmental, and nonshared environmental factors. Numerous domains of adolescent-reported parenting predicted adult maladaptive personality. Further, we found evidence for substantial additive genetic (ra ranging from 0.22 to 0.55) and (to a lesser extent) nonshared environmental factors (re ranging from 0.10 to 0.15) that accounted for the association between perceived parenting reported in adolescence and adult personality. Perceived parenting in adolescence and maladaptive personality in adulthood may be related due to some of the same genetic factors contributing to both phenotypes at different developmental periods.

Complex post-traumatic stress disorder (CPTSD) was adopted as a new diagnosis in ICD-11. Trauma-focused cognitive–behavioural therapy (CBT) is effective in treating PTSD but with CPTSD being a recently defined diagnosis, the evidence for its effectiveness in that disorder is not as clear, but it is still promising. This article reviews the diagnosis, psychopathology and some key differential diagnoses, and looks at the two CBT approaches that are currently used in clinical practice: the phase-oriented approach and the unimodal approach. The key aims of this article are to clarify the concept of CPTSD, its differentiation from borderline personality disorder and prominent comorbidities, how it develops and how CBT is used to treat it.

This paper presents a pioneering pilot implementation of group dialectical behaviour therapy (DBT) for adolescents with maladaptive coping in Qatar's child and adolescent mental health services. The project highlights the positive effect on patient satisfaction and the potential for early intervention with adolescents displaying emotional dysregulation. This pioneering initiative was consistent with local cultural values, stressing the importance of interconnectedness in mental health interventions. The impact of the initiative stresses its significance in diverse cultural contexts, urging further adoption regionally for improved mental health outcomes, particularly among adolescents displaying features of an emerging emotionally unstable personality disorder.

Clinical guidelines recommend avoiding the use of medications to manage personality disorder. In clinical practice, however, substantial amounts of medication are used. In this article, we summarise the recommendations of guidelines published in various countries in the past 15 years. We review the evidence from randomised controlled trials and recent reviews, discuss the discordance between guidance and clinical practice and give recommendations on what a clinician should consider if they choose to prescribe in cases of severe disturbances in mood or behaviour despite the lack of evidence.

The large volume of seemingly conflicting guidance on the management of borderline personality disorder (BPD), combined with the ongoing shortage of specialised resources, can make the task feel like an exclusive undertaking that the general psychiatrist is underprepared for. In this article, we distil current evidence to submit that sound psychiatric management principles used to treat all serious and enduring mental disorders (diagnostics, comorbidity management, rational pharmacotherapy and dynamic risk management) are readily applicable and particularly therapeutic for BPD. We offer actionable practice guidance that we hope will render the clinical management experience a more lucid and rewarding one for both practitioner and patient.

Borderline personality disorder (BPD) has been a controversial diagnosis for over 40 years. It was to be removed from the latest version of the ICD, only to be reintroduced as a trait qualifier as a result of last-minute lobbying. Retaining BPD as a de facto diagnosis keeps us stuck at a deadlock that undermines the voices of patients who have persistently told us this label adds ‘insult to injury’. Miranda Fricker's concept of epistemic injustice helps illuminate how this affects subjectivity and speech, hermeneutically sealing patients in ways of thinking that are not evidence-based, resulting in testimonial smothering (altering or withholding one's narratives) and testimonial quieting (dismissing a speaker's capacity to provide worthy testimony) that prevent more affirmative explanations.

This study examined the severity of unresolved attachment underlying adolescent identity diffusion. Our sample consisted of 180 inpatient adolescents aged 14 to 18 years (77% female, Mage = 15.13, SD = 1.35; 23% male, Mage = 14.85, SD = 1.41) and 84 age-matched non-clinical adolescents (52% female, Mage = 16.14, SD = 1.21; 48% males, Mage = 15.98, SD = 1.07). We used the Adult Attachment Projective Picture System (AAP) interview to assess attachment representations and the Assessment of Identity Development in Adolescence (AIDA) questionnaire to evaluate the severity of identity diffusion. Our results demonstrate a higher amount of unresolved attachment and identity diffusion in the patient sample than in the control sample. Furthermore, patients with an unresolved attachment status scored higher on identity diffusion than those with no unresolved attachment pattern. Interestingly, this was not found in the control group. Furthermore, patients with a greater severity of unresolved attachment showed the highest maladaptive identity development scores. Psychotherapeutic interventions integrating attachment-related aspects might be useful to treat young people with identity diffusion.

Personality disorders are a group of psychological disorders characterised by a developmental nature, long-lasting impairment and emotional suffering. Personality disorders have an estimated prevalence rate of approximately 8% in community settings, but in in-patient settings the rate might be as high as 76%. Cognitive–behavioural therapies (CBTs) include psychotherapies that emphasise the identification and modification of maladaptive thought patterns and behaviours that contribute to the maintenance of psychological disorders. CBTs have demonstrated their effectiveness in treating various types of personality disorder. This article focuses on the nature of personality disorders and their categorial and dimensional assessment and neurobiology. We present three influential CBT models used in personality disorders: schema therapy, cognitive interpersonal therapy and dialectical behaviour therapy. For each one, we outline the rationale, intervention strategies and therapeutic techniques, with practical examples and summary tables to illustrate their application.

Severity of personality disorder is an important determinant of future health. However, this key prognostic variable is not captured in routine clinical practice. Using a large clinical data-set, we explored the predictive validity of items from the Health of Nation Outcome Scales (HoNOS) as potential indicators of personality disorder severity. For 6912 patients with a personality disorder diagnosis, we examined associations between HoNOS items relating to core personality disorder symptoms (self-harm, difficulty in interpersonal relationships, performance of occupational and social roles, and agitation and aggression) and future health service use. Compared with those with no self-harm problem, the total healthcare cost was 2.74 times higher (95% CI 1.66–4.52; P < 0.001) for individuals with severe to very severe self-harm problems. Other HoNOS items did not demonstrate clear patterns of association with service costs. Self-harm may be a robust indicator of the severity of personality disorder, but further replication work is required.

Although complex post-traumatic stress disorder and borderline personality disorder are distinct disorders, there is confusion in clinical practice regarding the similarities between the diagnostic profiles of these conditions. We summarise the differences in the diagnostic criteria that are clinically informative and we illustrate these with case studies to enable diagnostic accuracy in clinical practice.