Recent studies suggest that Borderline Personality Disorder (BPD) could be regarded as an affective disorder within the Bipolar Affective Disorder (BP) spectrum. This is supported by evidence suggesting a clinical/neurobiological overlap between these two disorders. The Temperament and Character Inventory Revised (TCI-R) may help differentiate between the two disorders and orientate the clinical approach, considering the evidence of the medium-term temporal stability of TCI-R in a clinical population.

We present a clinical case diagnosed with BD which underwent testing using TCI-R. TCI-R orientated towards a secondary diagnosis of BPD and the case further received a course of Dialectical Behavior Therapy (DBT) which led to clinical improvement. We therefore study the usefulness of TCI-R in this clinical setting.

To study whether TCI-R may help differentiate between BD and BPD in mood stabilized patients.

Our patient is a 52-year-old married male diagnosed with BD. Considering his clinical features of impulsivity/instability of behaviors and pathological interpersonal relationships, patient was started on individual DBT (fortnightly, 4 months). Psychotropic treatment (paroxetine 30 mg/day, lithium 1000 mg/day, aripiprazole 15 mg/day) was not modified.

TCI-R scores: harm avoidance (100%), novelty seeking (53%), reward dependence (20%), persistence (18%), self-directedness (1%), cooperativeness (2%) and self-transcendence (48%). After 4 months of therapy, the patient improved in distress tolerance, acceptance, behavioral activation and assertiveness.

TCI-R is an inventory for personality traits in which character scores differ markedly between PD and non-PD patients. It is a useful tool in BPD patients orientating the clinician in the differential diagnosis and the treatment approach.

The authors have not supplied their declaration of competing interest.