Immediate outcomes after inpatient intensive CBT for severe, resistant OCD. More severe inpatients with comorbid Obsessive-Compulsive Personality Disorder get the most out of treatment. A preliminary study.

Introduction. Obsessive-Compulsive Disorder (OCD) with comorbid Obsessive-Compulsive Personality Disorder (OCPD) is associated to greater impairment than OCD alone. No research examined comorbid OCPD as a predictor of outcomes in resistant OCD. The current study investigated whether inpatients with resistant OCD and comorbid OCPD could benefit from an inpatient intensive CBT program (II-CBT). Methods. Fifty-six inpatients with resistant OCD were enrolled. Twenty had OCPD. Participants underwent a 5-week II-CBT including daily and prolonged ERP sessions. SCID-I and SCID-II were administered at baseline, Y-BOCS, and BDI-II at baseline and post-treatment. Results. Treatment effects were large [unbiased Hedges’ g= 1.11]. An interaction effect emerged between baseline Y-BOCS scores and comorbid OCPD on outcomes (F= 4.05, p<.05). Inpatients with more severe Y-BOCS scores and comorbid OCPD had greater pre-post-treatment changes on Y-BOCS (B= 0.85, t= 2.01, p<.01), but not on BDI-II. Conclusions. II-CBT seemed to be a strategy tailored for inpatients with resistant OCD with comorbid OCPD. However, II-CBT did not seem to target comorbid depression.