LAUSR

We investigated the utility of explicit case formulation (CF) within Cognitive Processing Therapy (CPT) for individuals with posttraumatic stress disorder (PTSD). An uncontrolled pre-posttreatment design was used. Participants attended 12-16 weekly sessions of CPT with explicit CF, where CF guided treatment length and treatment components. Treatment was completed by 19 of the 23 participants who started therapy. Results revealed significant reductions in PTSD and depression severity as well as unhelpful PTSD-related beliefs from pre- to posttreatment (ds between 1.10 - 1.92) and treatment gains were maintained at 3-month follow-up. Of the participants available at posttreatment for assessment, 69% (n = 11/16) met good end-state functioning for PTSD and 62% (n = 8/13) did so at follow-up. Finally, 72% (n = 13/18) of those interviewed at posttreatment no longer met criteria for PTSD and this was found for 93% of those assessed at follow-up (n = 14/15). Treatment, and CF in particular, was found to be acceptable by participants. Explicit case formulation did not interfere with positive outcomes of Cognitive Processing Therapy for PTSD. Further clinical implications and future directions for research are discussed.