Brief transdiagnostic group Acceptance and Commitment Therapy for acute inpatients with complex mental health conditions: a randomised pilot study using an active social control

Objectives: The present study examined the feasibility and acceptability of a brief transdiagnostic group-based Acceptance and Commitment Therapy (ACT; Valued Living Program, VLP) versus an active social control condition (Social Discussion Group, SDG) for inpatients admitted for acute mental health conditions. Method: Participants were group randomised to three sessions of the VLP (n = 17) or the SDG (n = 19) plus treatment-as-usual (TAU). The primary outcomes were service use data (emergency department presentations and inpatient admissions). Participants were assessed at pre-treatment, post-treatment, and at 4 and 12-months post-discharge on quantitative and qualitative secondary outcomes of psychological and behavioural functioning. Results: Both interventions were rated as acceptable and useful. Primary and secondary outcomes demonstrated a longitudinal pattern of improvement for the VLP condition relative to the SDG condition. Longitudinal drop-out was high, which reduced the reliability of quantitative secondary outcomes. Conclusions: The VLP appears acceptable to inpatients experiencing acute mental health conditions. Positive initial outcomes support further investigation into the VLP's effectiveness. However, the feasibility of evaluating the VLP via RCT was limited by poor participant retention which might be improved with additional study resources. Further investigation into protocol engagement is also warranted prior to proceeding with a larger RCT.