## Diagnostic Distinction Between Bipolar I and II ### Key Diagnostic Criterion **Key Point:** The defining difference between Bipolar Disorder I and II is the presence of a **full manic episode** (Bipolar I) versus a **hypomanic episode** (Bipolar II). ### Manic vs. Hypomanic Episode Comparison | Feature | Manic Episode | Hypomanic Episode | |---------|---------------|-------------------| | **Duration** | ≥7 consecutive days | ≥4 consecutive days | | **Severity** | Severe; causes marked impairment | Mild to moderate; minimal impairment | | **Hospitalization need** | Often required | Not required | | **Psychotic features** | May be present | Absent by definition | | **Functional impact** | Significant disruption in work/social life | No marked functional impairment | ### High-Yield Definition **High-Yield:** - **Bipolar I:** ≥1 manic episode (with or without depressive episodes) - **Bipolar II:** ≥1 hypomanic episode AND ≥1 major depressive episode (no manic episodes) ### Clinical Pearl **Clinical Pearl:** A patient with a single manic episode lasting 8 days meets criteria for Bipolar I, even if they never experience another mood episode. Conversely, a patient with multiple hypomanic episodes but no manic episodes, plus depression, has Bipolar II. ### Mnemonic **Mnemonic:** **M-I = Manic-I** (Bipolar I has Manic episodes); **H-II = Hypomanic-II** (Bipolar II has Hypomanic episodes). [cite:DSM-5 Diagnostic Criteria for Bipolar Disorder]
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