To conduct a three-arm partial randomised controlled trail to evaluate the effectiveness of expedited regular supportive psychotherapy and assertive case management for patients presenting with suicidal ideation or self-harm to the emergency department (ED).

we expect expedited regular supportive psychotherapy plus assertive case management will reduce the suicidality and/or suicidal behaviour in patients by at least 20% at 4 weeks compared to patients receiving only assertive case management or routine care and these differences will be sustained at 6 months.

This will be a longitudinal, prospective, three-arm controlled single-rater-blinded partial randomized clinical trial with a recruitment period of 12 months and an observation period of 6 months for each participant. Patients in the intervention group will receive regular face-to-face or over the phone brief supportive psychotherapy during weekdays following presentation to the ED with suicidal ideation or self-harm until patients are actively enrolled in regular community mental health services with active case management by the therapist. Patients in the control and the assertive outreach arms will each receive the usual follow-up services offered routinely to regular patients and assertive outreach patients respectively who present to the ED with suicidal ideation or self-harm.

Recruitment will commence in February 2016 and we expect the results of the study to be available by September 2017.

If our hypothesis is proved correct, our intervention will be a new model for caring for patients with self-harm and suicidal ideation and is expected to reduce suicide rates.

The authors have not supplied their declaration of competing interest.