A borderline focused Reflective Functioning measure - Interrater reliability of the Mentalization Breakdown Interview.

OBJECTIVE: Mentalizing difficulties can be considered the core psychopathology of borderline personality disorder (BPD). Typical failures of mentalizing are targets in therapy for BPD. They are related to severe distress, relational problems, self-destructive behaviors, violence, or substance misuse. A major obstacle in BPD treatment research is the lack of suitable and easily administrated methods to assess mentalizing ability during treatment. The Mentalization Breakdown Interview (MBI) is a new method for capturing episodic mentalizing difficulties occurring in close relationships. Interviews are videotaped and scored in accordance with the Reflective Functioning Scale (MBI-RF). In this way the patients' ability to retrospectively reflect over such episodes are evaluated. This study investigates the interrater reliability of MBI-RF.

METHODS: The study includes videotapes of MBIs from 32 patients with BPD in an outpatient clinic specialized on mentalization-based treatment (MBT). The MBIs were performed by MBT therapists. Three certified raters scored MBI-RF.

RESULTS: The interrater reliability was good for MBI-RF.

CONCLUSIONS: The MBI is promising as a BPD-focused method for the assessment of Reflective Functioning.