[Manic-depressive disease]

Manic-depressive illness (MDI) is a periodic major affective disorder defined by successive depressive and manic episodes, separated by free intercritic periods. Unipolar manic-depressive illness is defined by successive depressive episodes, whereas bipolar manic-depressive illness is defined by successive depressive and manic episodes. Clinical, familial and biological studies have demonstrated the heterogeneity of unipolar depression and its relationship with bipolar depression leading to questions about common etiopathogeny of those two disorders. Manic-depressive heterogeneity led to the identification of several subgroups defining "manic-depressive spectrum". The reunion of these different clinical entities is based on phenomenological, clinical and familial arguments. MDI is an endogenous pathology, as vulnerability to this disorder is mostly determined by genetic and/or biological factors. Treatment consist first on treatment of major episodes, based on curative and consolidation treatment and secondly on prophylactic treatment.