## DSM-5 Classification of Schizophrenia **Key Point:** DSM-5 (2013) eliminated the five subtypes (paranoid, disorganized, catatonic, undifferentiated, residual) that were present in DSM-IV. Instead, schizophrenia is now diagnosed using a **dimensional approach** with assessment across multiple symptom domains. ### Rationale for Change - The subtypes in DSM-IV showed poor reliability and limited clinical utility - Subtypes did not predict treatment response, course, or prognosis - A dimensional model better captures the heterogeneity of schizophrenia presentations ### Current DSM-5 Approach | Feature | DSM-IV | DSM-5 | | --- | --- | --- | | Classification | 5 discrete subtypes | Dimensional severity spectrum | | Assessment | Subtype-based | Domain-based (positive, negative, cognitive, mood, motor) | | Severity | Implicit in subtype | Explicit 4-point severity scale per domain | | Prognostic value | Limited | Better predictive validity | **High-Yield:** Examiners frequently test knowledge of this paradigm shift. Students must know that **DSM-5 does NOT use subtypes anymore**—this is a common source of error in older textbooks. **Clinical Pearl:** The dimensional approach allows clinicians to specify the severity of each symptom domain (e.g., "moderate positive symptoms, severe negative symptoms"), which better guides treatment planning and prognosis estimation. ### What Happened to the Old Subtypes? - **Paranoid subtype:** Not used; paranoid delusions are now coded as a specifier if present - **Disorganized, catatonic, undifferentiated, residual:** Removed from diagnostic criteria - **Catatonia:** Now recognized as a specifier that can apply to multiple disorders (schizophrenia, mood disorders, medical conditions) [cite:DSM-5]
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