Associations between violence, self-harm and acute psychiatric service use: Implications for inpatient care

WHAT IS KNOWN ON THE SUBJECT?: Service users who behave violently may suffer. This is because violence can lead to unnecessary medication, seclusion on the ward and strained relationships with other people. It can also affect a service user's self-esteem and lead to feelings of shame. Service users who behave violently can also make life frightening and unpredictable for members of staff, and other service users on the ward. It is important to gain a sound understanding of violence in order to help reduce it. WHAT THE PAPER ADDS TO EXISTING KNOWLEDGE?: Previous research has shown that having a past history of violence, being admitted to PICU and being admitted to hospital under section is associated with violent behaviour on the ward. We identified several new factors associated with violent behaviour, such as engaging in self-harm, being the target of another person's violence and being referred to a Psychiatric Liaison Team.

For some service users, behaving violently may be a response to previous trauma and an expression of distress. It is therefore important that mental health nurses are supported by their employers to work with service users in a trauma-informed manner. Nurses employed across a range of psychiatric settings could benefit from direct interventions such as comprehensive trauma-informed care training and psychological debrief spaces, or systemic interventions to address staff shortages and improve ward conditions.

INTRODUCTION: Instances of violence in acute psychiatric settings are frequent, can be devastating for service users and staff, and are costly. Such settings would benefit from a greater understanding of violence.

We analysed the association between current and historical variables and rates of inpatient violence. To address gaps in current research, we included instances of self-harm and being the target of violence. We also included seldom used service metrics.

Data were extracted on admissions to acute adult wards and PICUs 2017-2020 within South London and Maudsley NHS Foundation Trust. A zero-inflated negative binomial regression mixed model was used to analyse the impact of variables on rates of violence.

Variables associated with an increased rate of violence were as follows: an increased number of violent incidents in the year before admission, being admitted on MHA section, being admitted to PICU, instances of self-harm, being the target of violence and referral to a Psychiatric Liaison Team.

The novel associations found between enacting violence, self-harm and being the target of violence indicate trauma-informed care is crucial to reduce violent presentations of distress.

System level interventions are crucial to ensure mental health nurses are supported to provide trauma-informed care.