- Psychiatric Times Vol 26 No 4
- Volume 26
- Issue 4
Comorbidity in Bipolar Disorder
The central tenet of clinical comorbidity, the occurrence of 2 syndromes in the same patient, presupposes that they are distinct categorical entities.
The central tenet of clinical comorbidity, the occurrence of 2 syndromes in the same patient, presupposes that they are distinct categorical entities. By this definition, 2 or more coexisting syndromes do not negate one another, nor paradoxically does this coexistence negate the potential for one to influence the course, outcome, and treatment response of the other. Isolating a syndrome by characterizing it through a unique pathogenic process allows for diagnostic fidelity even while acknowledging overlapping phenotypes.
Bipolar disorder (BPD) is highly prevalent and heterogeneous. Its increasing complexity is often caused by the presence of comorbid conditions, which have become the rule rather than the exception. Lifetime prevalence of psychiatric comorbidity has been reported in community and clinical studies. Most (95%) of the respondents with BPD in the National Comorbidity Survey met criteria for 3 or more lifetime psychiatric disorders.1 In a Stanley Foundation Bipolar Treatment Outcome Network study of almost 300 patients, 65% met DSM-IV criteria for at least 1 comorbid Axis I disorder.2
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