Interpersonal aspects of personality disorders in opioid-dependent patients: the convergence of the ICL-R and the SIDP-IV.

This study aims to establish the convergence of the empirically based Diagnostic Statistical Manual (DSM)- and theory-based interpersonal behavioral approaches to personality, in opioid-dependent patients (n = 110), with the use of the Structured Interview for DSM-IV Personality [Pfohl et al.: Structured Interview for DSM-IV PD. Iowa City, UICM, 1995] and the Interpersonal Checklist-Revised (ICL-R) [DeJong and VandenBrink: ICL-R. St. Oedenrode/NL, Novadic, 1998]. As hypothesized, based on prior research, we found the two approaches to be complementary rather than interchangeable. However, some overlap was found between the SIDP-IV dimensions and the ICL-R, mainly with rebellious/distrustful, reserved/silent and masochistic/self-effacing styles. Results indicate that drug dependence in itself is not a predictor of interpersonal style, while personality pathology is. Patients with a personality disorder (PD) perceive themselves as hostile and submissive, while patients without a PD view themselves as friendly and controlling. The SIDP-IV seems informative in classifying PDs, in addition guidelines for behavioral change, in addicted patients, were provided based on the ICL-R.