## Personality Disorder Clusters Overview **Key Point:** The DSM-5 organizes personality disorders into three clusters based on shared phenomenological features and behavioral patterns. ### Cluster Classification | Cluster | Descriptive Label | Key Features | Disorders | |---------|-------------------|--------------|----------| | **Cluster A** | Odd, eccentric | Pervasive pattern of social detachment, restricted affect, magical thinking | Paranoid, Schizoid, Schizotypal | | **Cluster B** | Dramatic, emotional, erratic | Pervasive pattern of instability in interpersonal relationships, self-image, affect; impulsivity | Antisocial, Borderline, Histrionic, Narcissistic | | **Cluster C** | Anxious, fearful, avoidant | Pervasive pattern of social inhibition, feelings of inadequacy, hypersensitivity to negative evaluation | Avoidant, Dependent, Obsessive-Compulsive | **High-Yield:** Cluster B disorders are the most dramatic and are often the focus of emergency psychiatry and forensic cases. They include the "Big Four": Antisocial, Borderline, Histrionic, and Narcissistic personality disorders. **Clinical Pearl:** Cluster B patients frequently present to emergency departments with acute crises, self-harm, or interpersonal conflicts. Borderline personality disorder is the most common cluster B disorder in clinical settings. **Mnemonic for Cluster B:** **D.E.I.** = **D**ramatic, **E**motional, **I**mpulsive (and Erratic).
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