From Diagnosis to Treatment: Bipolar Depression

The chapter opens with the historical development of the concept of bipolar disorder: the authors start with the physician Areteus, who lived around 150 CE and considered melancholia a part of mania, move to Falret and Baillarger's 1850s descriptions of "circular insanity" (folie circulaire), then explain how Kraepelin, a century later, built psychiatry's first medical disease model based on careful observation, separating manic-depressive illness from schizophrenia (then called "dementia praecox"). The historical overview closes with Leonhard's 1957 proposal of the bipolar-unipolar distinction and its formal entry into classification with the DSM-III in 1980.

The authors then explain how the DSM-IV classifies bipolar disorders: Bipolar I (requiring a past or current manic or mixed episode), Bipolar II (hypomanic episodes together with major depression), Cyclothymia (milder depressive and hypomanic periods lasting at least two years), and the residual "not otherwise specified" category. They also explain how this classification carries additional "specifiers" for clinical decisions — such as severity, psychotic features, and seasonal pattern.

The chapter's liveliest section is the debate around hypomania's duration criterion. The DSM-IV defines hypomania as a period lasting at least four days, characterized by elevated, expansive, or irritable mood, but some researchers argue this duration is artificially long, and that periods of one to three days also carry clinical significance. The authors cite Bauer and colleagues' 2011 study: when the duration criterion was lowered from four days to one day, the number of reported hypomanic periods rose from 305 to 2,164 — showing just how much the choice of criterion affects diagnostic statistics. Lowering this duration to two days was seriously debated during DSM-5 preparations, but it was ultimately reverted back to four days.

The reliability of the Bipolar II diagnosis is also discussed separately — the authors explain that this diagnosis suffers from the difficulty of reliably identifying retrospective hypomanic episodes, which is why information gathered from family members and various screening questionnaires (such as the Hypomania Checklist) serve as important supplementary tools. The chapter then touches on the blurred boundary between schizophrenia and bipolar disorder — discussing how shared genetics and treatment similarities suggest that a dimensional approach, rather than categorical classification, may be needed.

The question of whether antidepressant-induced mania/hypomania should be evaluated separately within bipolar disorder is also explored in detail. The authors show that the majority view holds this to be the unmasking of an "underlying, hidden bipolar tendency," though the DSM-IV excludes antidepressant-induced episodes from diagnosis. Akiskal and colleagues' proposal to call such cases "bipolar III" is presented as an intermediate solution.

The chapter's final section is interesting for its statistics on the transition from unipolar depression to bipolar disorder: various long-term follow-up studies show differing percentages — Dunner's study reports 5%, while Angst's 22-year follow-up study reports that up to 39.2% of patients' initial unipolar depression diagnosis was later converted to bipolar disorder. The authors interpret this as an inevitable limitation arising from classification systems being based on descriptive criteria, since a patient's first depressive episode must always be recorded as unipolar until a future manic episode occurs.

The chapter closes with Kraepelin's spectrum view — the idea of a broad continuum with unipolar disorder at one end and bipolar disorder at the other, along with a second perspective covering the relationship between full episodes and milder "temperament" traits. The authors emphasize this view's potential to enrich genetic transmission models and identify high-risk individuals before the illness begins, but also acknowledge that no spectrum model has yet achieved general acceptance.

What comes after this is the work of the book's remaining eight chapters — the clinical differences between bipolar and unipolar depression, treatment planning, the use of drug classes, maintenance treatment, and psychotherapies. So we're stopping here. But we want to stress: this book is a resource written for clinicians — if you observe these symptoms in yourself or someone close to you, diagnostic and treatment decisions should only be made by a qualified psychiatrist.

• A joint work by six Turkish psychiatry professors led by editor Simavi Vahip — each chapter is written by a different author.
• Every chapter is backed by dozens of scientific journal citations; in-text references follow academic format.
• Tables (such as the DSM-IV classification) visualize the clinical classification.
• The language is written entirely in a clinical-academic register — far from everyday language, requiring medical training.
• The book was published in 2012; some DSM-5 preparatory discussions described in the text as "ongoing" were already resolved with the publication of DSM-5 in 2013 — readers should keep this in mind.