Protocol of a randomised controlled trial of a novel brief psychological intervention for young people presenting to emergency departments in the UK with self-harm or suicidal ideation with recent self-harm: the SASH study (Supporting Adolescents with Self-Harm).

introductionSelf-harm is the strongest predictor of suicide in young people. Self-harm presentations to the emergency department (ED) are associated with repeat self-harm and suicide. Rapid follow-up contact after ED offers an opportunity to intervene before self-harm becomes an established coping strategy. Despite recent progress in self-harm treatment, currently, there are no evidence-based interventions to prevent future self-harm and suicide offered to young people after visits to the ED. Preliminary evidence suggests therapeutic assessment and rapid follow-up contacts may reduce self-harm and improve engagement in follow-up care. In this study, we assess the clinical and cost-effectiveness of a brief psychological intervention, supporting adolescents with self-harm (SASH), in addition to standard care in a randomised controlled trial, compared with standard care only. As per National Institute for Health and Care Excellence guidelines, standard care involves at least one follow-up by a mental health professional within 7 days of ED discharge. METHODS AND ANALYSIS: The SASH intervention comprises up to six follow-up contacts with a mental health professional delivered over approximately 2 months for young people and their carers using a solution-focused approach, shortly after presenting to the ED. Participants are aged 12-18, presenting to the ED with self-harm or suicidal ideation (with self-harm in the past month), with capacity to consent. We aim to recruit 144 young people into the trial who will be randomised on a 1:1 basis to the SASH intervention or treatment as usual. Participants are assessed postintervention/standard care and at 6-month follow-up after randomisation. Self-reported self-harm is assessed via text message survey every 2 weeks during the 6-month follow-up period. The primary outcome is self-reported episodes of self-harm in the past month assessed at 6 months by summing three behavioural domains of the self-injurious thoughts and behaviours interview. We hypothesise that the therapeutic relationship with the mental health practitioner will mediate this relationship. Secondary outcomes include symptoms of depression and anxiety, frequency of reattendance at ED, death by suicide, school attendance, well-being and additional domains of self-harm-related behaviour and thoughts in the past month. The trial will also consider service use, costs to carer and carer health-related quality of life to evaluate the costs and cost-effectiveness of the intervention. ETHICS AND DISSEMINATION: London-Riverside Nation Health Service REC (22/LO/0400) provided a favourable ethical opinion. Findings will be disseminated through social media, a website, scientific papers, conferences and reports, in collaboration with our Young Person's Lived Experience Advisory Group. TRIAL REGISTRATION NUMBER: ISRCTN81846131. PROTOCOL VERSION: 13.0, 30.06.2025.