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ABSTRACT
The aim of this study was to determine the frequency of dissociative disorders among psychiatric outpatients with borderline personality disorder (BPD). In order to ascertain the extent of the overlap between two diagnostic groups, the overall prevalence of both disorders were evaluated. Two hundred and forty (240) consecutive patients who presented to a university outpatient psychiatry unit were screened using the self-report questionnaire version of the BPD section of Structured Clinical Interview for DSM-III-R Personality Disorders (SCID-II), the Dissociative Experiences Scale (DES) and the Somatoform Dissociation Questionnaire (SDQ). One hundred and twenty-nine (129) participants who had a score above the cut-off point on at least one of these instruments were evaluated using the interview version of the BPD section of the SCID-II, the Dissociative Disorders Interview Schedule (DDIS), and the PTSD module of the Structured Clinical Interview for DSM-III-R (SCID-I). All participants who were diagnosed as having BPD or a dissociative disorder were evaluated then with the Structured Clinical Interview for DSM-IV Dissociative Disorders (SCID-D). Twenty-five (25; 10.4%) participants had BPD and 33 participants (13.8%) had dissociative disorder in the final evaluation. Sixteen participants (64.0%) with BPD had the Axis I diagnosis of a dissociative disorder; all six participants (2.5%) with dissociative identity disorder were among them. The findings demonstrate that a significant part of psychiatric outpatients who fit the criteria of BPD have a DSM-IV dissociative disorder on Axis I. The presence of dissociative symptoms as a part of BPD should not lead to overlooking the possibility of a co-occurring dissociative disorder.