Comparing Group Therapies for Veterans With Depression and PTSD

Objective To examine efficacy of G-TBT on improving quality of life, psychological well-being, and social reintegration of Veterans with PTSD, Major Depressive Disorder, and related conditions compared to G-DSTs using a non-inferiority design. Patient satisfaction, access, and predictors of feasibility (attendance and discontinuation) also will be assessed.

Recruitment Strategy Veterans will be recruited through the Primary Care - Mental Health Integration, General Outpatient Mental Health, and CBT Clinic programs at the Charleston VAMC. Within these programs, all Veterans reporting symptoms of depression and anxiety meet with a mental health staff member to complete a clinical interview and self-report measures. If Veterans endorse symptoms consistent with a depressive/anxiety disorder, interest in participating in research will be assessed and, if agreeable, the Veteran will be referred to project staff. A study-specific intake appointment will be completed with the project staff to assess inclusion/exclusion criteria (with a targeted sample of 326 VAMC patients), including a semi-structured clinical interview and self-report questionnaires focused on quality of life, social integration, and psychiatric symptoms (described later). Participants who meet inclusion/exclusion criteria will be randomized into a study condition, and will be assigned to a project therapist. Because most VAMC patients who meet study criteria likely will present with multiple depressive/anxiety disorders, principal diagnosis, or the most impairing of the diagnosable disorders, will be used to select patients for participation and inform randomization. Principal diagnosis will be determined via diagnostic severity scores in the Anxiety Disorders Interview Schedule-5. To balance diagnoses across the two conditions, a stratified random assignment based on principal diagnosis will be used (Major Depressive Disorder and PTSD).

Procedures Eligible VAMC patients will be randomized into one of two treatment conditions: G-TBT or G-DSTs. Both treatment conditions will include 12 weekly 90-minute group sessions. The general format of sessions will involve: 1) brief check-in; 2) review of materials from previous sessions; 3) review of homework assignments; 4) overview of new materials and in-session exercises; and 5) assignment of homework for next session. Attendance and homework completion will be recorded.

Treatment groups (G-TBT, Group CBT-Depression, Group Cognitive Processing Therapy for PTSD) will require at least 6 participants and maximum of 12 participants to begin. Upon randomization, participants will be notified of the group assignment and expected wait period for the group to begin. Wait periods (in days) will be recorded as an indicator of access to treatment across groups.

Randomization Procedures Participants will be randomly assigned (1:1) to one of the two study arms (n = 104 per arm) using a permuted block randomization procedure. Randomization will be stratified by principal diagnostic group (or most impairing disorder between Major Depressive Disorder and PTSD if both disorders are present, based upon disorder-specific interference and distress severity scores) and block size will be varied to minimize the likelihood of unmasking. If both disorders evidence identical severity scores (highly unlikely), participants will be asked which of the two disorders is more impairing/significant for randomization purposes. After determining eligibility and completing consent and baseline assessment materials, enrolled participants will be assigned to treatment conditions by the Research Coordinator/Therapist using a computer-generated randomization scheme. Once a participant is randomized, they will be included in the intent-to-treat analysis. Randomization will occur at the participant level.

Group Transdiagnostic Behavior Therapy TBT was developed as a streamlined protocol to address transdiagnostic avoidance via the use of four different types of exposure techniques (situational/in-vivo, physical/interoceptive, thought/imaginal, and [positive] emotional/behavioral activation). From the transdiagnostic avoidance perspective, the four exposure practices are matched to the type(s) of avoidance experienced by patients based upon their cluster of symptoms/disorders. Per protocol, the first six sessions of TBT are designed to educate on, prepare for, and practice the four different types of exposure techniques. The next five sessions are focused on practicing and refining exposure practices as participants work through their lists of avoided situations/sensation/thoughts. The final session reviews treatment progress and relapse prevention strategies.

G-DSTs Control Condition Matching and Assignment To provide an evidence-based comparison for the G-TBT condition, G-DSTs will be used that are matched to the participant's principal diagnosis. G-DSTs will include groups for the most common principal diagnoses that have VA-approved protocols and training programs, including PTSD (Cognitive Processing Therapy for PTSD) and Major Depressive Disorder (CBT-Depression). Each of these G-DSTs have published manuals for administration and have received extensive support in the literature. Participants randomized to a G-DST group will be matched to the G-DST based on the principal diagnosis determined via the diagnostic interview.