Persistent Delusional Disorder (Paranoid)

Persistent Delusional Disorder is a psychotic disorder characterized by one or more delusions that persist for at least 1 month. Unlike schizophrenia, prominent hallucinations, disorganized speech, or negative symptoms are absent. It is classified as “Delusional Disorder” in DSM-5 and has six subtypes.

Clinical Features

1. Diagnostic Criteria (DSM-5)

• One or more fixed delusions lasting at least 1 month.
• Criteria for schizophrenia (Criterion A) are not met (hallucinations are absent or minimal).
• Functioning is not markedly impaired except in areas directly affected by the delusions.
• Symptoms are not attributable to substance use or a medical condition.

Etiology and Risk Factors

1. Biological Factors

• Dopamine hypothesis: Excessive dopaminergic activity, particularly in the mesolimbic pathway.
• Familial history: Presence of schizophrenia or delusional disorder in close relatives.

2. Psychosocial Factors

• Isolation: More common in elderly individuals with limited social support.
• Personality traits: Paranoid, schizoid, or schizotypal personality organization.
• Migration and cultural stress: Can be triggered by feelings of alienation.

Differential Diagnosis

• Schizophrenia: Accompanied by disorganized behavior and hallucinations.
• Bipolar disorder (manic episode): Grandiose delusions occur alongside mood disturbances.
• Organic psychosis: Delusions caused by tumors, dementia, or substance use.

Treatment Approaches

1. Pharmacotherapy

• Second-generation antipsychotics: Risperidone, Olanzapine, Aripiprazole.
• Antidepressants (for jealous type): SSRIs (e.g., Fluoxetine).

2. Psychotherapy

• Cognitive Behavioral Therapy (CBT): Challenging delusional beliefs through logical scrutiny.
• Supportive therapy: Building trust to foster insight.

3. Hospitalization

• Emergency situations: When there is a risk of harm to self or others.

Prognosis and Course

• Typically follows a chronic but stable course.
• In 30–50% of cases, symptoms gradually diminish over time.
• Erotomanic and jealous subtypes tend to be more resistant to treatment.