## Distinguishing Melancholic vs Atypical Depression ### Key Discriminating Features **Key Point:** The most reliable discriminator between melancholic and atypical MDD is the **pattern of sleep disturbance and mood reactivity**. ### Comparison Table | Feature | Melancholic | Atypical | | --- | --- | --- | | **Sleep** | Early morning awakening (terminal insomnia) | Hypersomnia (>10 hrs/day) | | **Appetite/Weight** | Decreased appetite, weight loss | Increased appetite, weight gain | | **Mood Pattern** | Non-reactive; worse in early morning | Reactive; improves with positive events | | **Psychomotor** | Retardation or agitation | Leaden paralysis (heaviness in limbs) | | **Guilt** | Severe, pervasive | Mild or absent | | **Anhedonia** | Present in all activities | Present but may vary | ### Why Hypersomnia + Mood Reactivity is the Best Answer **High-Yield:** Atypical depression is **uniquely characterized by the combination of hypersomnia (not insomnia) and mood reactivity**—the mood improves when something good happens, which is atypical for depression. This dual feature is pathognomonic for the atypical specifier. **Clinical Pearl:** Melancholic patients have **anhedonia that is pervasive and non-reactive**—nothing brings pleasure, and mood is worst in the early morning. Atypical patients retain some capacity for mood improvement and sleep excessively rather than insufficiently. ### Mnemonic: MELANCHOLIC vs ATYPICAL - **MELANCHOLIC**: **E**arly morning awakening, **L**oss of appetite, **A**nhedonia (complete), **N**on-reactive mood - **ATYPICAL**: **A**ppetite increased, **T**oo much sleep, **Y**earning for positive events (mood reactive), **P**aralyzing heaviness **Warning:** Do not confuse anhedonia (present in both) with mood reactivity (present only in atypical). Both subtypes have anhedonia, but only atypical depression shows mood brightening with positive events.
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