Mentalizing deficits in borderline personality disorder related to axis I comorbidity: Clinical relevance.

Aim: Deficits in mentalization have been described in several mental disorders, but information is still scarce and ambiguous about the types of mentalization errors in each disorder and their specificity and severity in borderline personality disorder (BPD). Due to the high comorbidity between this disorder and axis I disorders, the aim of this work is to study differences in mentalization responses in BPD considering the different comorbidity profiles with other disorders.

Methods: A total of 141 BPD patients were evaluated using The Mini-International Neuropsychiatric Interview (MINI), to identify comorbid axis I disorders. Mentalizing ability was assessed by the Movie for the Assessment of Social Cognition (MASC). Statistical associations were analysed into the different variables.

Results: Patients with comorbid BPD and anorexia nervosa (AN), suicidal behaviour disorder or post-traumatic stress disorder (PTSD) respectively presented higher overmentalization, undermentalization and absence of mentalization errors, compared with patients with BPD without comorbidity.

Conclusions: Results show that BPD comorbidity with AN, suicidal behaviour disorder and PTSD affect to the types and severity of mentalizing deficits observed in these patients. This study highlights the importance of the assessment and treatment of axis I comorbid disorders in borderline personality disorder, with the objective of shaping personalized treatment for every patient.