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Related Experiment Videos

Borderline personality-bipolar spectrum relationship.

Franco Benazzi1

  • 1Hecker Psychiatry Research Center, a University of California at San Diego, USA. FrancoBenazzi@FBenazzi.it

Progress in Neuro-Psychopharmacology & Biological Psychiatry
|July 16, 2005
PubMed
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Borderline personality disorder (BPD) traits related to affective instability are associated with bipolar-II disorder (BP-II), but impulsivity traits are not. This suggests BPD may comprise distinct dimensions, clarifying the unclear relationship between BPD and BP-II.

Area of Science:

  • Psychiatry
  • Clinical Psychology
  • Mental Health Research

Background:

  • The diagnostic relationship between borderline personality disorder (BPD) and bipolar disorders, particularly bipolar-II disorder (BP-II), remains ambiguous.
  • Previous reviews have yielded conflicting conclusions regarding whether BPD should be classified as a bipolar spectrum disorder or considered unrelated.
  • This study aimed to delineate specific BPD symptom items associated with BP-II versus those that are not.

Purpose of the Study:

  • To investigate the association between specific borderline personality traits (BPT) and bipolar-II disorder (BP-II).
  • To identify which components of BPD are linked to BP-II and which are not, to clarify diagnostic ambiguities.
  • To explore the potential for subtyping BPD based on distinct symptom dimensions.

Main Methods:

Related Experiment Videos

  • A consecutive sample of 138 BP-II and 71 remitted major depressive disorder (MDD) outpatients were assessed in an Italian private practice.
  • Diagnosis of BP-II and MDD was conducted using the Structured Clinical Interview for DSM-IV Axis I Disorders-Clinician Version (SCID-CV).
  • Borderline personality traits (BPT) were self-assessed by patients using the SCID-II Personality Questionnaire, focusing on DSM-IV BPD items excluding impairment criteria.

Main Results:

  • Borderline personality traits (BPT) were significantly more prevalent in BP-II patients compared to MDD patients.
  • A cutoff of 5 or more BPT items showed 45.9% sensitivity and 71.4% specificity for predicting BP-II.
  • Factor analysis identified two dimensions: 'affective instability' (associated with BP-II) and 'impulsivity' (not associated with BP-II).

Conclusions:

  • Findings suggest that borderline personality disorder (BPD) may encompass distinct symptom clusters: one related to affective instability and associated with BP-II, and another related to impulsivity, which is not.
  • This distinction may explain the divergent conclusions from previous reviews on the relationship between BPD and bipolar disorders.
  • The study supports the potential for subtyping BPD based on these identified affective instability and impulsivity dimensions.