Bipolar depression - Spectrum of clinical pictures and differentiation from unipolar depression

Patients with bipolar disorder often present initially with a major depressive episode. The correct diagnosis at the first presentation could help to find an effective medication regimen, to prevent antidepressant-induced rapid cycling and to reduce antidepressant-induced manic episodes, e.g. though combination therapy with a mood stabilizer. Consistent predictors for an underlying bipolar illness are an early age of onset, a highly recurrent illness course with more than five episodes, the presentation of atypical features, psychotic symptoms, the presence of psychiatric comorbidities like anxiety disorders, history of suicide attempts (especially at an early age), positive family anamnesis for bipolar disorder, and a rapid evolvement of the depressive episode. So far there are no pathognomonic markers for bipolar disorder. Therefore we propose to assess the risk of each patient for having bipolar disorder individually. Patients who are at a high risk should at least be informed and should be closely monitored for the development of manic episodes.