A new bipolar spectrum concept: a brief review

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Abstract
Angst J, Gamma A. A new bipolar spectrum concept: a brief review. Bipolar Disord 2002: 4(Suppl. 1): 11–14. © Blackwell Munksgaard, 2002 Research on the broad bipolar spectrum is dependent on the definition of hypomania. We recently proposed a new, softer syndromal definition with clinical validity. This broadens the diagnosis of bipolar II (BP‐II) disorder at the expense of major depressive disorder (MDD). There is evidence for a third group of suspected BP‐II manifesting major depression plus hypomanic symptoms. The two bipolar‐II groups together are as prevalent as MDD. A new concept of minor bipolar disorder embracing dysthymia, minor and recurrent brief depression with hypomanic syndromes and symptoms is discussed. Some methodological pitfalls of research on drug‐induced hypomania as an element of the bipolar spectrum are also summarized.