Personality Disorders

Personality can be defined as an organizational system of self that shapes the manner in which a person interacts with his or her environment. Personality traits develop in adolescence or early adulthood and are thought to be shaped by early childhood experiences and enduring throughout a lifetime. Personality traits that prevent an individual from being able to function in society or that cause significant distress are diagnosed as personality disorders. A thorough history is needed to rule out other psychiatric and medical disorders. This chapter reviews the diagnostic criteria, differential diagnosis, comorbidity, prevalence, etiology (including genetics and neurobiology), prognosis, and treatment of paranoid, schizoid, schizotypal, borderline, antisocial, narcissistic, histrionic, avoidant, obsessive-compulsive, and dependent personality disorders. A discussion of the relevance of personality disorders to primary care practices and approaches to managing such patients is also included. Tables describe the diagnostic criteria of each personality disorder. Figures illustrate the prevalence of personality disorders in the general and psychiatric populations; schizotypal personality disorder in the community, general population, and clinical population; childhood trauma in individuals with personality disorder; and comorbid disorders in individuals with borderline personality disorder. A model of brain processing in borderline personality disorder is also featured. This chapter contains 5 highly rendered figures, 10 tables, 230 references, and 5 MCQs.