Approach to paranoid, schizoid, and schizotypal (cluster A) personality disorders: Clinical sciences

Personality disorders represent an enduring and pervasive pattern of perceiving and relating to oneself, others, and the world in atypical, and often detrimental, ways.

Unlike most psychiatric conditions, personality disorders are frequently ego-syntonic, meaning many people with personality disorders don’t perceive their behaviors as problematic. Consequently, these disorders typically do not cause direct distress to the individual but can lead to significant interpersonal and occupational difficulties.

There are ten personality disorders defined in the Diagnostic and Statistical Manual of Mental Disorders fifth edition, or DSM-5 for short, and these are divided into clusters A, B, and C. Cluster A personality disorders include paranoid personality disorders, schizoid personality disorders, and schizotypal personality disorders.

Now, when a patient presents with a chief concern suggesting a personality disorder, first obtain a focused history and physical exam. Common symptoms can include significant interpersonal or occupational difficulties, patterns of hyper-dependence on or hyper-independence from others, and a tendency to blame others for their own feelings and behaviors. Additionally, frequent or extreme mood swings, angry outbursts, and attention seeking behaviors can be observed.

The physical exam is often unremarkable, but can be characterized by extremes of affect, ranging from flat to exaggerated facial expressions. With this presentation, you should consider a personality disorder.

Next, assess your patient using the DSM-5 criteria for personality disorder. All personality disorders are characterized by an enduring pattern of thinking, feeling, and behaving in culturally atypical ways, and these traits are inflexible and maladaptive in multiple settings. The onset of this pattern must be during adolescence or early adulthood, although traits can be recognized at much younger ages. Additionally, the patient’s symptoms must cause clinically significant distress or impairment. If these criteria are met, you can diagnose your patient with a personality disorder.

Once you’ve made your diagnosis of a personality disorder, assess for the key personality features to help you determine the cluster type.

Here’s a high-yield fact! There are 3 major clusters of personality disorders: A, B, and C. You can remember them by the group name. Cluster A disorders include paranoid which is accusatory; schizoid is aloof; and schizotypal which can be described as atypical. With B disorders, think narcissistic is the best; histrionic boast; antisocial break laws; and borderline... well there is already a B in there. Lastly, for cluster C, avoidant can be described as cowardly; dependent as clingy; while obsessive-compulsive doesn’t need really additional descriptions.

For patients who are often described as atypical, odd, or eccentric, consider cluster A personality disorders.

Okay, your next step is to assess for key features like persistent paranoia to help you determine the specific type of personality disorder.

If present, look for interpersonal signs and symptoms of paranoia in their history. These Individuals are highly suspicious and believe that others are intentionally and maliciously trying to hurt them. They are hypersensitive to perceived attacks and betrayals, reluctant to trust others by constantly watching for potential threats. Even in close relationships, they tend to doubt the loyalty of friends and romantic partners. For example, they might suspect their partner is unfaithful, even though there is no evidence, and despite their partner’s reassurances of love and fidelity, they continue to be suspicious. Finally, if they feel their trust has been betrayed, they often hold grudges and refuse to forgive what they perceive as a deliberate attack.

With these features, you should strongly consider paranoid personality disorder, or PPD. To confirm your diagnosis, assess the patient using the DSM-5 criteria for PPD. If your patient displays at least four of the behavioral patterns from history with onset by early adulthood, you can diagnose paranoid personality disorder.