Does Exposure and Response Prevention Behaviorally Activate Patients With Obsessive-Compulsive Disorder? A...

Area of Science:

• Psychiatry
• Clinical Psychology
• Behavioral Therapy

Background:

• Obsessive-compulsive disorder (OCD) frequently co-occurs with depression.
• Exposure and Response Prevention (ERP) is a primary treatment for OCD and has been linked to reduced depressive symptoms.
• The mechanism by which ERP impacts depression, specifically through behavioral activation (BA), remains underexplored in patients with comorbid OCD and depression.

Purpose of the Study:

• To investigate the relationship between OCD exposure hierarchy completion, increased BA, and depressive symptom reduction.
• To test whether changes in BA mediate the effect of ERP on reducing depressive symptoms in patients with OCD and comorbid depression.
• To control for potential confounding variables including baseline symptom severity, OCD symptom reduction, treatment duration, and medication use.

Main Methods:

• Prospective study design involving 90 patients diagnosed with primary OCD.
• Patients underwent residential ERP treatment for OCD.
• Self-report measures of OCD symptoms, depressive symptoms, and BA were administered at pre- and posttreatment.

Main Results:

• Significant positive correlations were found between exposure hierarchy completion, increases in BA, and decreases in depressive symptoms (rs ranging from .33 to .44).
• Pre- to posttreatment changes in BA fully mediated the relationship between OCD exposure hierarchy completion and posttreatment depressive symptom reduction.
• These findings held true even after controlling for baseline depressive symptoms, baseline BA, OCD symptom reduction, treatment duration, and antidepressant medication use.

Conclusions:

• ERP treatment for OCD may exert antidepressant effects by enhancing behavioral activation in patients.
• Behavioral activation appears to be a key mechanism through which ERP alleviates depressive symptoms in individuals with comorbid OCD and depression.
• These findings underscore the potential of ERP as a transdiagnostic intervention, addressing both OCD and associated depressive symptoms through a shared behavioral mechanism.