A closer look at the clusters
Cluster A disorders
Paranoid, schizoid, and schizotypal disorders are part of this cluster. These patients exhibit odd or eccentric thinking and behavior. Individuals with schizoid personality disorder, for instance, usually lack relationships and lack the desire to acquire and maintain relationships.4 They often organize their lives to remain isolated and will choose occupations that require little social interaction. They sometimes view themselves as observers rather than participants in their own lives.6
Cluster B disorders
Dramatic, overly emotional, or unpredictable thinking and behavior are characteristic of individuals who have antisocial, borderline, histrionic, or narcissistic disorders. Patients with borderline personality disorder (BPD), for example, demonstrate a longstanding pattern of instability in affect, self-image, and relationships.4 Patients with BPD often display extreme interpersonal hypersensitivity and make frantic efforts to avoid real or imagined abandonment. Identity disturbance, feelings of emptiness, and efforts to avoid abandonment have all been associated with increased suicide risk.7
In a primary care setting, such a patient may display extremely strong reactions to minor disappointments. When the physician is unavailable for a last-minute appointment or to authorize an unscheduled medication refill or to receive an after-hours phone call, the patient may become irate. The physician, who previously was idealized by the patient as “the only person who understands me,” is now devalued as “the worst doctor I’ve ever had.”8
Cluster C disorders
With these individuals, anxious or fearful thinking and behavior predominate. Avoidant, dependent, and obsessive-compulsive disorders are included in this cluster.
Dependent personality disorder (DPD) is characterized by a pervasive and extreme need to be taken care of. Submissive and clingy behavior and fear of separation are excessive. This patient may have difficulty making everyday decisions, being assertive, or expressing disagreement with others.4
Obsessive-compulsive personality disorder falls in this cluster and is typified by a pervasive preoccupation with orderliness, perfectionism, and control, at the price of flexibility and efficiency. This individual may be reluctant to get rid of sentimental objects, have rigid moral beliefs, and have significant difficulty working with others who do not follow their rules.4
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