[Usefulness of the Beck depression inventory in the diagnosis of depressive disorders in multiple sclerosis].

Introduction: Depression is one of the most prevalent psychiatric conditions in adulthood, reaching figures of around 20%. The methodologies used to study depression are varied, and range from a self-administered test to structured psychiatric assessment. Several studies of patients with multiple sclerosis (MS) have been conducted in the last 20 years, and figures of around 35% have been found for depressive symptoms, while depressive disorders are less frequent, at approximately 21%.

Aims: The aim of this study is to evaluate the usefulness of patient self-reported scales such as the Beck depression inventory (BDI) for identifying depressive symptoms in patients with MS, and to analyse their correlation with the diagnosis of clinical depression or depressive disorder using the psychiatric clinical interview based on the criteria of the Diagnostic and statistical manual of mental disorders, fifth edition.

Patients and methods: This is a multicentre descriptive cross-sectional study of patients with MS and depressive symptoms. The BDI and the Hamilton depression rating scale (HDRS) were used, and the patients with the highest scores underwent psychiatric assessment.

Results: A total of 191 patients were included; 81 of these (40.5%) had depressive symptomatology in the pathological range according to the BDI (cut-off point of 14), and 20 had a severe score (above 28). Nineteen patients with severe depressive symptoms according to both scales were selected and finally evaluated by a psychiatrist, who also assessed five patients who according to the neurologist had severe depressive symptoms despite a BDI score of almost 28, but did not reach that level. The suspected major depressive disorder was confirmed in only four (21%) cases with BDI scores indicative of severe symptoms. There is no correlation between the severity score as evidenced by the BDI and the psychiatric assessment. A major depressive disorder was diagnosed in 16 (66.6%) of the 24 patients with BDI > 26 evaluated by psychiatry. A score above 26 on the BDI enables identification of 75% of cases of depressive disorder without subtyping. The correlation between the HDRS and the BDI was statistically significant (r = 0.8; p < 0).

Conclusions: The BDI is a useful screening test for identifying patients with depressive symptoms; in specific terms, a score above 26 is probably indicative of a depressive disorder that may benefit from psychiatric assessment.