Review article
The soft bipolar spectrum redefined: focus on the cyclothymic, anxious-sensitive, impulse-dyscontrol, and binge-eating connection in bipolar II and related conditions

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The concept of spectrum in psychiatry

The concept of spectrum originally was used in physics to indicate an apparent qualitative distinction arising from a quantitative continuum (ie, a series of colors formed when a beam of white light is dispersed by a prism so that their parts are arranged in the order of their wavelengths) [1]. In psychiatry, the concept of spectrum was first used with a slightly different connotation to identify a group of disorders that is qualitatively distinct in appearance (eg, depression and alcoholism)

The bipolar spectrum

In the last third of the twentieth century, the unipolar-bipolar distinction of manic-depressive illness, originally conceptualized by Edda Neele [25] and Leonhard [26] and subsequently developed by Angst [27], Perris [28], and Winokur et al [29], has proved to be of great heuristic value for clinical and therapeutic research. This dichotomous approach, however, left undefined many affective conditions in the interface of unipolar and bipolar disorders. Originally, Fieve and Dunner [30] and

Is the bipolar II spectrum autonomous?

Do patients with bipolar II disorder represent an autonomous type of bipolar illness, or are they a transitory condition between unipolar and full-blown bipolar I disorder? Several lines of evidence concerning phenomenology, pattern of familial illness, natural history, and treatment response support the qualitative distinction between bipolar II and bipolar I patients. In a progress report on bipolar II disorder, William Coryell [42] concluded that bipolar II patients cannot be included with

Diagnostic boundaries of bipolar II spectrum conditions

Emerging data from several epidemiologic studies conducted in the United States and abroad have challenged the conservative figures of 1% commonly cited in the literature for bipolar disorder [58], [59], [60]. With the inclusion of various hypomanic conditions and submanic symptoms, the rates have increased to 5% to 8% [40], [61], [62], [63]. Although individuals within the bipolar II spectrum represent the most common bipolar phenotype [47], they are often unrecognized, poorly researched, and

The temperamental foundation of the bipolar II spectrum

The concept of “affective temperament” derives from Greco-Roman and continental European psychiatry [37] and refers to specific constitutionally based affective dispositions (ie, melancholic-dysthymic, choleric-irritable, sanguine-hyperthymic, and cyclothymic). It is a dimensional construct, which only in its extremes can be considered to be abnormal in a statistical, and perhaps clinical, sense. Kraepelin [37] described the cyclothymic disposition as one of the constitutional substrates from

The bipolar II spectrum, impulse control, and eating disorders connection

The foregoing discussion has considered what can be categorized within a broad spectrum of bipolar II disorder and extends into the realm of anxiety, impulse control, eating and personality disorders, and substance abuse. This formulation is diagrammed in Fig. 1, in which the light bulb is a schematic representation of the source of the bipolar II spectrum and its temperament: The light goes across the prism of environmental stressors and results in the different expressions of the soft bipolar

Summary

The bipolar II spectrum represents the most common phenotype of bipolarity. Numerous studies indicate that in clinical settings this soft spectrum might be as common—if not more common than—major depressive disorders. The proportion of depressive patients who can be classified as bipolar II further increases if the 4-day threshold for hypomania proposed by the DSM-IV is reconsidered. The modal duration of hypomanic episodes is 2 days; highly recurrent brief hypomania is as short as 1 day, and

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