Use of 'acute behavioural disturbance' in mental health records: differences over time and by ethnicity in a London NHS mental health Trust.

The term ABD in mental health notes appears to often, but not exclusively, be a synonym for severe agitation and conveys little meaning beyond this. However, the term's connection to a literature emphasising the high risk of physical health collapse and need for urgent treatment means that its disproportionate use in Black people may contribute to existing racial inequalities in the use of coercive measures during crisis presentations.