Cognitive Therapy-as-Usual versus Cognitive Therapy plus the Memory Support Intervention for adults with depression: 12-month outcomes and opportunities for improved efficacy in a secondary analysis of a randomized controlled trial

Objective: Patient memory for treatment is emerging as an important transdiagnostic mechanism of treatment outcomes. However, patient memory for treatment is limited. The Memory Support Intervention was developed to improve patient memory for treatment and thereby strengthen treatment outcomes. In this secondary analysis, the primary, preregistered aim was to test the 12-month follow-up outcomes of the Memory Support Intervention when used with cognitive therapy (CT + MS) for major depressive disorder, relative to CT-as-usual. The secondary, exploratory aim was to investigate opportunities to improve efficacy of the Memory Support Intervention.Method: Adults (N = 178) with major depressive disorder were randomized to CT-as-usual or CT + MS. Therapist use of memory support and patient memory for treatment, depression symptoms, and overall functioning were measured in blind assessments. Results: Findings did not support differences between treatment conditions at 12-month follow-up. Therapists used memory support strategies with a narrow subset of treatment contents, and similarly, patients recalled a narrow subset of treatment contents. Conclusions: The findings highlight ways to strengthen the efficacy of the Memory Support Intervention, such as applying memory support strategies across a wider variety of treatment contents, which in turn, may boost patient recall and outcomes.