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Original

Bipolar II disorder: personality and outcome in two clinical samples

, , , , , , , & show all
Pages 433-438 | Received 11 Apr 2003, Accepted 08 Mar 2004, Published online: 07 Aug 2009
 

Abstract

Objective: To compare the personality traits and disorders of patients with bipolar II disorder and major depression and to examine the impact on treatment outcome of a bipolar II diagnosis.

Method: Patients from two clinical trials, a depressive sample (n = 195, 10% bipolar II) and a bulimic sample (n = 135, 16% bipolar II), were assessed for personality traits using DSM-IV criteria. Patients were randomised to treatments (fluoxetine or nortriptyline for depressive sample; cognitive behaviour therapy for bulimic sample) and followed for 3 years (depressive sample) or 5 years (bulimic sample) to assess the impact on outcome of a bipolar II diagnosis.

Results: Bipolar II patients were assessed as having more borderline, histrionic and schizotypal personality traits than patients with major depression. A baseline bipolar II diagnosis did not impact negatively on treatment outcome, and less than 5% of bipolar II patients developed bipolar I disorder during follow up.

Conclusions: The low rate of conversion of bipolar II to bipolar I disorder and the lack of adverse impact of the diagnosis on outcome, questions the need for antimanic or mood stabliser medication in most bipolar II patients.

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