THE EVOLVING BIPOLAR SPECTRUM: Prototypes I, II, III, and IV
Section snippets
FROM KRAEPELIN TO DSM-V
Kraepelin32 envisaged a continuum between manic and depressive states. His grand vision, developed at the turn of the nineteenth century, was based on clinical observation, longitudinal course, and family history. Many patients who began with depression ended up with mania and vice versa; other depressives went as far as hypomania but not beyond; there were also patients who had a cyclical course without discernible excited episodes but who were temperamentally similar to manic-depressive
BIPOLAR I: FULL-BLOWN MANIA
Manic-depressive illness often has an explosive manic onset with psychosis (mania means psychosis in Greek). Other patients begin with a mixture of depression and mania (dubbed dysphoric mania in the literature). Because the emphasis in this article is on the depressive aspects of the bipolar spectrum, the case provided next—with a long latency between the first depression and the first clear-cut manic episode—illustrates the never-ending risk for bipolarity in recurrent depression.
In
BIPOLAR I½: DEPRESSION WITH PROTRACTED HYPOMANIA
Where hypomania ends and mania begins is not clearly demarcated. Individuals with hypomania do not experience significant impairment, whereas mania is unmistakably disabling. Patients exist between these extremes, with protracted hypomanic periods, which cause some trouble to the patient and significant others without reaching the destructive potential that is almost always the case with the extreme excitement of full-blown manic psychosis.
This 45-year-old never-married man presented because of
BIPOLAR II: DEPRESSION WITH HYPOMANIA
Bipolar II patients by definition have moderately to severely impairing major depressions, interspersed with hypomanic periods of at least 4 days' duration without marked impairment. Signs and symptoms of a hypomanic episode represent a departure from the patient's habitual baseline and are summarized in Table 1.8
Although behavior is colored by the elated mood, confidence, and optimism, judgment is relatively preserved compared with mania. Nonetheless, the cyclic course of the disease may
BIPOLAR II½: CYCLOTHYMIC DEPRESSIONS
According to the DSM-IV schema, bipolar II patients must have clinical depression with hypomania of 4 days' duration or longer. Current research indicates that the more modal distribution for hypomania is 1 to 3 days.4 This means that a great many soft bipolar patients do not meet the strict DSM-IV criteria for bipolar II disorder. Patients with short hypomania often have a recurrent pattern of periods of excitement, which are followed by minidepressions, thereby fulfilling the criteria for
BIPOLAR III: ANTIDEPRESSANT-ASSOCIATED HYPOMANIA
Many patients with spontaneous hypomanic and manic episodes also often develop these episodes during antidepressant treatment. This process is often mediated by cyclothymic temperamental tendencies,8 of which hypomania is a natural expectation. This process appears quite different from clinically depressed patients, who experience hypomania only during antidepressant treatment. Clinical observations suggest that many of these patients have a depressive temperament or, to use DSM-IV language,
BIPOLAR III½: BIPOLARITY MASKED—AND UNMASKED—BY STIMULANT ABUSE
In bipolar disorder types I and II, there are discrete episodes of excitement of manic and hypomanic intensity; in type III, the occurrence of these episodes is in association with antidepressant use as well as other somatic treatment. There are also patients whose periods of excitement are so closely linked with substance or alcohol use and abuse that it is not always easy to decide whether these periods would have occurred in the absence of such use and abuse. In these cases that the authors
BIPOLAR IV: HYPERTHYMIC DEPRESSION
For this category, we propose patients with clinical depression that occurs later in life and superimposed on a lifelong hyperthymic temperament.3 The attributes of a hyperthymic temperament are not episode-bound and constitute part of the habitual long-term functioning of the individual (Table 4). Patients are typically men in their 50s whose lifelong drive, ambition, high energy, confidence, and extroverted interpersonal skills helped them to advance in life, to achieve successes in a variety
CONCLUSIONS
This article has emphasized the depressive manifestations of a range of bipolar conditions, which are best regarded as pseudo-unipolar.2, 5 We have not considered the severe psychotic end of bipolar disorder11 nor have we presented the emerging fascinating data about the offspring of bipolar parents.7 The main thesis of this article has been that many major depressions in the DSM-IV schema are, in reality, part of the bipolar spectrum. Skeptics should examine a classic NIMH study by Gershon et
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Address reprint requests to Hagop S. Akiskal, MD, Department of Psychiatry, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093–0603, e-mail: [email protected]
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International Mood Center, Department of Psychiatry, University of California at San Diego, La Jolla, California