Which feature best distinguishes Borderline Personality Disorder (Cluster B) from Obsessive-Compulsive Personality Disorder (Cluster C)?

Explanation

## Distinguishing Borderline from Obsessive-Compulsive Personality Disorder ### Core Differentiating Features **Key Point:** Borderline Personality Disorder (BPD) is characterized by **impulsivity, affective instability, and fear of abandonment**, whereas Obsessive-Compulsive Personality Disorder (OCPD) is marked by **ego-syntonic rigidity, perfectionism, and control**. ### Comparative Table | Feature | Borderline PD (Cluster B) | OCPD (Cluster C) | |---------|--------------------------|------------------| | **Impulsivity** | Marked (substance abuse, self-harm, reckless spending) | Absent; highly controlled | | **Relationship pattern** | Intense, unstable, fear of abandonment | Distant, formal, difficulty with intimacy | | **Affective state** | Rapid mood swings, chronic emptiness | Restricted affect, controlled | | **Ego-syntonicity** | Ego-dystonic (distress from symptoms) | Ego-syntonic (sees traits as correct) | | **Perfectionism** | Not prominent; impulsive decisions | Central feature; excessive devotion to work | | **Response to criticism** | Intense shame, rage, or abandonment fear | Defensive, argumentative about standards | ### High-Yield Distinction **High-Yield:** The **impulsivity and unstable interpersonal relationships with fear of abandonment** are the hallmark of BPD and directly contrast with OCPD's controlled, rigid, and emotionally distant presentation. BPD patients act out; OCPD patients control and organize. ### Clinical Pearl **Clinical Pearl:** BPD patients often present in crisis (self-harm, suicidal ideation, relationship breakdown); OCPD patients rarely seek help unless relationships fail or work performance is questioned. BPD is **ego-dystonic** (the person is distressed); OCPD is **ego-syntonic** (the person believes their way is correct). ### Mnemonic **Mnemonic:** **BORDER** = **B**orderline has **I**mpulsivity, **R**elationship **I**nstability, **D**read of **A**bandonment, **E**motional **R**eactivity, **D**isorder (chaos). **OCPD** = **O**ver-**C**ontrol, **P**erfectionism, **D**istant relationships.