Transdiagnostic skills training group of dialectical behavior therapy: a long-term naturalistic study

Dialectical Behavior Therapy (DBT) has assembled a large body of evidence for the treatment of emotional dysregulation in borderline personality disorder (BPD), but also in other disorders characterized by emotional dysregulation (e.g., bipolar disorder (BD) and ADHD). Standalone skills learning groups address the problem of limited resources in several clinical settings. Furthermore, transdiagnostic skills groups facilitate the recruitment and decrease the scattering of resources in psychiatric settings. However, few studies have focused on the pertinence of transdiagnostic standalone skills groups in naturalistic settings as well as their long-term outcomes. The goal of this study is to assess the impact of participation in a transdiagnostic DBT skills group one year after its completion. Transdiagnostic DBT skills training groups were provided for BPD, BD and ADHD patients in a University Psychiatric Department (Strasbourg, France), between 2019 and 2020. They consisted of 16 group sessions of 2.5 h and 3 individual sessions. At 1-year follow-up, ad-hoc questionnaires were proposed to all participants to assess the perceived impacts, the changes in symptomatology, and the maintenance of skills learned. 22 of the 31 participants were interviewed at the one-year post-group session (64% BPD, 41% ADHD and 27% BD). 73% participants estimated that group impact was important or very important, 64% stated using the skills learned often or very often, mainly emotion regulation skills. An improvement in emotional instability, substance use, impulsivity and suicidal thoughts was reported by respectively 100%, 91%, 86% and 85% of participants. Quality of life improved according to 90% participants. All patients reported an improvement in suicidality during the post-group year, especially in suicide attempts. Psychotropic medication decreased in 59% of participants. Our one-year naturalistic study suggests that transdiagnostic DBT skills training groups are promising for the treatment of emotional dysregulation in people with BPD, BD and/or ADHD. The observational design and the lack of control group are the main limitations. Randomized controlled studies are required to confirm the long-term efficacy of transdiagnostic skills learning groups in naturalistic settings.