A 28-year-old woman from Delhi presents to the psychiatry outpatient department with a 3-week history of elevated mood, decreased need for sleep (sleeping only 3–4 hours per night but feeling fully rested), racing thoughts, and increased goal-directed activity. She reports starting three new business ventures simultaneously and has spent ₹5 lakhs on impulsive purchases in the past 10 days. She denies any psychotic symptoms. Her past psychiatric history includes two episodes of major depressive disorder lasting 2–3 months each, treated with fluoxetine with good response. She has no history of manic or hypomanic episodes prior to this presentation. What is the most likely diagnosis?

Explanation

## Diagnosis: Bipolar Disorder I with Current Manic Episode ### Clinical Presentation Analysis This patient presents with a clear manic episode characterized by: - **Elevated mood** for ≥3 weeks (meets duration criterion) - **Decreased need for sleep** (feeling rested after 3–4 hours) - **Racing thoughts** and **increased goal-directed activity** - **Impulsive behavior** (excessive spending) - **Absence of psychotic symptoms** (explicitly stated) ### Bipolar I vs. Bipolar II Differentiation | Feature | Bipolar I | Bipolar II | |---------|-----------|----------| | **Manic episode** | Required (full mania) | Absent | | **Hypomanic episode** | May occur | Required (≥4 days) | | **Severity** | Severe; may cause hospitalization or psychosis | Milder; no psychosis; no hospitalization | | **Depressive episodes** | Present | Present | **Key Point:** The presence of a full manic episode (≥7 days of elevated mood with 3+ symptoms causing significant functional impairment) defines Bipolar I, regardless of prior depressive episodes. **High-Yield:** Bipolar II is defined by recurrent major depressive episodes alternating with hypomanic episodes (NOT manic episodes). This patient has a manic episode, not hypomanic, making Bipolar I the diagnosis. ### Why This Is Bipolar I, Not II - **Duration & severity:** The patient's elevated mood has lasted 3 weeks with marked functional impairment (multiple new business ventures, ₹5 lakh spending spree)—this is **mania**, not hypomania. - **Hypomania** (Bipolar II) lasts ≥4 consecutive days and does NOT cause marked functional impairment or require hospitalization. - **Mania** (Bipolar I) lasts ≥7 days, causes severe functional impairment, and may include psychotic features. **Clinical Pearl:** The history of prior major depressive episodes does not change the diagnosis—it simply establishes the bipolar pattern. The current episode's severity and duration determine whether it is mania (Bipolar I) or hypomania (Bipolar II). ### DSM-5 Criterion Met - ≥3 symptoms of mania (elevated mood, decreased sleep, racing thoughts, increased goal-directed activity, impulsive spending) - Duration ≥7 days (3 weeks in this case) - Significant functional impairment - **Diagnosis: Bipolar I Disorder, Current Episode Manic** [cite:DSM-5 Diagnostic and Statistical Manual of Mental Disorders]