(PSYCHIATRIC TIMES) - Psychiatric Times - Category 1 Credit
To earn AMA PRA Category 1 Credit(s)™:
Read the article "Borderline Personality Disorder and Bipolar Disorder" from the July 2009 issue of Psychiatric Times, complete the posttest and the evaluation. (Note: A score of at least 70% must be achieved in order to be awarded credit.)
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After reading this article, you will be familiar with:
• Ways to distinguish between borderline personality disorder and bipolar disorder
• Diagnoses based on mood episodes, impulsivity, and longitudinal course of borderline personality disorder and bipolar disorder
• Treatment implications - pharmacological and psychosocial interventions
Who will benefit from reading this article?
Psychiatrists, psychologists, primary care physicians, nurse practitioners, and other health care professionals. To determine whether this article meets the continuing education requirements of your specialty, please contact your state licensing and certification boards.
Since the inclusion of the borderline personality disorder (BPD) diagnosis in DSM, there have been multiple efforts to recast the disorder as part of an Axis I illness category. While the initial focus was on the schizophrenia spectrum,1 more recent authors have attempted to link BPD to mood disorders. There is considerable literature on the relationship between major depressive disorder (MDD) and BPD, and although the current understanding posits distinct disorders, overlapping biological underpinnings do exist.2 Attention has now turned to bipolar disorder, with several vocal advocates who propose reclassifying BPD as bipolar spectrum disorder.3,4 This article discusses the overlapping phenomenology of bipolar disorder and BPD and highlights distinguishing features of clinical diagnosis and treatment.
According to DSM-IV-TR, the prevalence of BPD is estimated at 2% of the general population, compared with 1% to 2% for bipolar disorder. Other estimates are closer to 5% for bipolar spectrum disorder.5 Depending on the population studied, there are varying estimates of the co-occurrence of BPD and bipolar disorder. In a recent comprehensive review by Paris and colleagues,6 the rate of bipolar I disorder in BPD patients ranged from 5.6% to 16.1%, with a median of 9.2%. The rate of bipolar II disorder was only slightly higher, 8% to 19%, with a median of 10.7%. The 2 studies with the strongest methodologies that used structured diagnostic interviews with adequate sample sizes and a 6- to 7-year follow-up showed a low rate of new onset of bipolar disorder in patients with BPD, with no difference from the comparison groups.7,8 A recent study that used the large Collaborative Longitudinal Study of Personality Disorders (CLPS) database, however, showed an increased rate of bipolar I and II disorders in patients with BPD compared with patients who had personality disorders other than BPD, including schizotypal, avoidant, and obsessive-compulsive personality disorders (19.4% and 7.9%, respectively). In addition, BPD patients had a higher rate of bipolar I and II disorder onset (8.2% for BPD vs 3.1% for the other personality disorders) over 4 years.9 While these studies suggest a moderately increased risk for bipolar disorder in patients with BPD, it was not nearly as high as the risk for MDD or substance abuse.
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