The Effectiveness of Acceptance Commitment Therapy on Obsessive Compulsive Disorder: A Systematic Review and Meta-Analysis

Abstract

This single case study describes acceptance and commitment therapy (ACT) with exposure and response prevention (ERP) used with a client presenting with symptoms of obsessive compulsive disorder (OCD). Standardized and idiographic outcome measures, including OCD-specific measures (Brief Yale-Brown Obsessive Compulsive Scale; Obsessional Compulsive Inventory), general measures of well-being and risk (CORE Outcome Measure; Outcome Rating Scale), an idiographic measure (Easy Personal Questionnaire), and a Sessional Rating Scale, were used across baseline and treatment phases. Statistical measures of reliable and clinical change were calculated, and client perspective on change was sought through interview. Cause-effect analysis was used to evaluate the extent to which therapeutic change was due to ACT-specific processes. Results showed reliable positive change with a probability of p < .05 across measures, and clinical change in three of five of the measures in which it could be calculated. The client reported improvements in well-being and the extent to which she lives her life according to her values. ACT-specific processes as well as generic therapy processes influenced change. The client's own strengths and personal contributions to therapy played a major role in her achievement of therapeutic goals. The use of ACT with ERP in treating OCD and collaborative use of outcome measures with careful evaluation are recommended to clinicians.