Bipolar I Disorder vs Borderline Personality Disorder
Bipolar I Disorder and Borderline Personality Disorder are easy to mix up on the boards. Here's a side-by-side comparison — presentation, workup, imaging, and first-line treatment — drawn from our full outlines.
Bipolar I Disorder vs Borderline Personality Disorder at a glance
- Bipolar I Disorder: At least one lifetime manic episode; depressive and hypomanic episodes common but not required for diagnosis.
- Borderline Personality Disorder: Pervasive instability of relationships, self-image, affect, and marked impulsivity beginning in early adulthood.
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Side-by-side comparison
| Feature | Bipolar I Disorder | Borderline Personality Disorder |
|---|---|---|
| At a glance | At least one lifetime manic episode; depressive and hypomanic episodes common but not required for diagnosis. | Pervasive instability of relationships, self-image, affect, and marked impulsivity beginning in early adulthood. |
| Classic presentation | Manic patient with reduced need for sleep (e.g., sleeping 2-3 hours and feeling rested), spending sprees, hypersexuality, and grandiose business plans.; Manic… | >=5 of 9 DSM-5-TR criteria: frantic efforts to avoid real/imagined abandonment; unstable intense relationships alternating idealization and devaluation;… |
| Workup / key labs | DSM-5-TR Bipolar I: At least one lifetime manic episode — distinct period (>=7 days, or any duration if hospitalized) of elevated/expansive/irritable mood AND… | DSM-5-TR: A pervasive pattern of instability of interpersonal relationships, self-image, and affects, and marked impulsivity, beginning by early adulthood and… |
| Imaging | Neuroimaging not routine; consider MRI if atypical features or first episode after age 50 | Not routinely indicated |
| First-line treatment | Mood stabilizer — lithium (gold standard, anti-suicide effect), valproate, or lamotrigine (bipolar depression and maintenance); Atypical antipsychotic —… | Evidence-based psychotherapy is primary — dialectical behavior therapy (DBT), mentalization-based therapy (MBT), transference-focused psychotherapy (TFP),… |
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