{"id":49051,"date":"2020-11-17T17:34:03","date_gmt":"2020-11-17T16:34:03","guid":{"rendered":"https:\/\/blogs.bmj.com\/bmj\/?p=49051"},"modified":"2020-11-24T17:40:45","modified_gmt":"2020-11-24T16:40:45","slug":"violence-risk-assessment-in-psychiatry-nobody-can-predict-the-future","status":"publish","type":"post","link":"https:\/\/blogs.bmj.com\/bmj\/2020\/11\/17\/violence-risk-assessment-in-psychiatry-nobody-can-predict-the-future\/","title":{"rendered":"Violence risk assessment in psychiatry: nobody can predict the future"},"content":{"rendered":"

Violence risk assessments are sometimes used to inform decisions around the involuntary admission of people to hospital. Yet the evidence for their use is at best unclear, say Gautam Gulati, Colum P Dunne, and Brendan D Kelly<\/span><\/p>\n

The word \u201crisk\u201d is used by psychiatrists on a daily basis. But where psychiatrists used to primarily judge \u201csuicide risk,\u201d this has evolved over the past five decades to include \u201crisk of violence,\u201d \u201crisk of sexual offending,\u201d \u201crisk of arson,\u201d and many other \u201crisks.\u201d To put it simply, society increasingly expects psychiatrists to be able to predict future events with some degree of certainty so that adverse outcomes can hopefully be prevented.<\/span><\/p>\n

Societal perceptions of psychiatric conditions, and their relation to the risk of someone harming themselves or other people, are often skewed by unhelpful media narratives that depict <\/span>mentally unwell people as violent<\/span><\/a>. In reality, however, the evidence shows that people with mental illness are <\/span>more likely to be the victims<\/span><\/a>, rather than the perpetrators, of violent crime.\u00a0\u00a0<\/span><\/p>\n

In spite of the evidence, societal perceptions around mental illness and violent behaviour have the potential to affect the practice of doctors. High profile cases over the years have shown how doctors can face <\/span>prosecution<\/span><\/a>, regulatory action, and\/or <\/span>adverse media attention<\/span><\/a> in the rare instances when a patient who is mentally unwell does go on to behave violently or commit a crime<\/span>. Under the threat of these, doctors may use violence risk assessments to inform decisions around the involuntary admission of people to hospital. This should be a cause of grave concern for all.<\/span><\/p>\n

The number of forensic secure beds in the UK has <\/span>increased considerably in the past 30 years<\/span><\/a>. At the beginning of the 1990s, there were 1700 high and 600 medium secure beds, while in 2015 there were approximately 800 high and 3200 medium secure beds. <\/span>One in three of these are in the private sector<\/span><\/a>, funded by the NHS, with the involuntary admission of patients to secure care coming at a cost of <\/span>1% of the entire NHS budget and 10% of the mental health budget<\/span><\/a>. People in secure care include those who have been diverted from the criminal justice system, as well as those deemed to require a secure unit for treatment due to \u201cchallenging behaviour\u201d in general psychiatric units. Violence risk assessments are routinely performed as part of this process,\u00a0 and presented as evidence of the continued \u201crisk\u201d a person presents, necessitating involuntary care, not least because the word \u201crisk\u201d often features in the legal criteria for involuntary admission.\u00a0<\/span><\/p>\n

We\u2019d argue that this well intentioned increase in secure hospital beds to facilitate care for people who are mentally ill in the criminal justice system has gone too far. Evidence suggests that the mean length of stay in such units is several years, with <\/span>one study<\/span><\/a> finding that 23% of patients staying in high secure hospitals were there for more than 10 years and 18% in medium secure hospitals were there for more than five years.\u00a0<\/span><\/p>\n

Violence risk assessments are also used in non-secure psychiatric settings, such as community forensic services, rehabilitation psychiatry services, prison psychiatry services, and where a psychiatrist has been asked to advise the courts. This can sometimes be done to evaluate whether <\/span>\u201crisk to others can be managed in a community setting\u201d.<\/span><\/a> Again, this has implications for liberty.<\/span><\/p>\n

In parallel, there has been a significant increase in violence risk assessment \u201ctools\u201d and there are now <\/span>at least 200 of these available<\/span><\/a>. Do they work? The evidence is unclear, to say the least. Large scale meta-reviews have shown severe limitations in the predictive values of such tools. In one systematic review, the most commonly used violence risk assessment tools were found to have <\/span>positive predictive values between 0.18-0.76<\/span><\/a>. That is, they correctly predict those likely to offend with an accuracy between 18% and 76%, depending on the baseline risk in the population studied. In general adult psychiatry, where violence is a rare event, predictive power is extremely low. Would any of us be willing to fly in an aircraft with an 18% chance of completing a predicted journey? Why then, should we be content that such evidence is used to support the deprivation of people\u2019s liberty?<\/span><\/p>\n

As more nations ratify the <\/span>United Nations\u2019 Convention on the Rights of People with Disability<\/span><\/a>, this surely is the time to ask why it appears to be acceptable to make decisions around liberty in someone with mental illness on the basis of such equivocal evidence of risk. We argue that it is not acceptable.<\/span><\/p>\n

Some countries are making progress in this area. Irish case law, for example, does not support preventative detention in psychiatry. <\/span>Ireland\u2019s rate<\/span><\/a> of involuntary psychiatric admission (46 per 100 000 total population per year)\u00a0 is less than half of <\/span>that in England<\/span><\/a> (120 per 100 000 total population per year)<\/span>.<\/span><\/p>\n

It would surely be better for psychiatry to renegotiate its relationship with society, accepting that psychiatry, as a profession, cannot predict the future and communicating this to the public. The time and resources invested in violence risk assessment could usefully be re-invested in doing what doctors have done well for millenia: developing meaningful, therapeutic relationships and delivering care.\u00a0<\/span><\/p>\n

Patients are also more likely to trust physicians when their relationship is not clouded by the prospect of having deeply flawed risk assessments that might lead to unjustified involuntary admission. The removal of this barrier, and the subsequent increased help seeking behaviour of patients and access to treatment, would undoubtedly prevent more rare adverse outcomes than lengthy detentions would. This is especially true when such detentions are based on risk assessments that are at best flawed, and at worst entirely random.\u00a0<\/span><\/p>\n

Gautam Gulati <\/i><\/b>is a forensic and general adult psychiatrist at St Joseph\u2019s Hospital, Limerick, Ireland and adjunct associate clinical professor at the University of Limerick, Ireland. He has experience in using violence risk assessment instruments.\u00a0<\/span><\/i><\/p>\n

Colum P Dunne<\/i><\/b> is the foundation professor and director of research at the University of Limerick\u2019s School of Medicine and has an interest in mental health and law.\u00a0<\/span><\/i><\/p>\n

Brendan D Kelly<\/i><\/b> is professor of psychiatry at Trinity College, Dublin and has specialisms which include Buddhist studies, ethics, governance, and la<\/span><\/i>w.<\/span><\/p>\n

Conflicts of interest: <\/b>We have read and understood <\/span>BMJ policy on declaration of interests<\/span><\/a> and have the following interests to declare: GG is chair of the Faculty of Forensic Psychiatry of the College of Psychiatrists of Ireland. The views expressed are his own. CPD has no conflicts of interest to declare. BDK has no conflicts of interest to declare.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Violence risk assessments are sometimes used to inform decisions around the involuntary admission of people to hospital. Yet the evidence for their use is at best unclear, say Gautam Gulati, […]<\/p>\n

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