Comorbid personality disorders and their impact on the presentation of severe dissociative experiences in patients with borderline personality disorder in Mexican patients

The objective of this study was to identify personality disorders comorbid to BPD that confer greater risk for the presence of severe dissociative experiences. Three hundred and one outpatients with a primary diagnosis of BPD were evaluated using the Structured Clinical Interview for DSM-IV Axis II personality disorders (SCID-II), the Borderline Evaluation of Severity Over Time (BEST) and the Dissociative Experiences Scale (DES). Our results show that the most frequent personality disorders comorbid to BPD were paranoid (83.2%, n = 263) and depressive (81.3%, n = 257). On average, the patients scored with 43.3 points and 28.6 points in the BEST and DES scales respectively. We categorized the sample into patients with and without severe dissociative experiences (41% were positive). A logistic regression model revealed that Schizotypal, Obsessive-compulsive and Antisocial personality disorders conferred greater risk for the presence of severe dissociative experiences. The results suggest that a large proportion of patients with BPD present a high rate of severe dissociative experiences and that some clinical factors such as personality comorbidity confer greater risk for dissociation, which is related to greater dysfunction and suffering, as well as a worse progression of the BPD.