Persistent delusional disorder with delusions of poverty - a case study

Area of Science:

• Psychiatry
• Clinical Psychology
• Neuroscience

Background:

• Psychotic depression presents with mood and psychotic symptoms.
• Differentiating psychotic depression from delusional disorders is crucial for effective treatment.
• Standard treatments may fail when the underlying diagnosis is misidentified.

Purpose of the Study:

• To present a case study illustrating diagnostic challenges in patients with co-occurring psychotic and affective symptoms.
• To emphasize the importance of symptom onset sequencing in differential diagnosis.
• To highlight the therapeutic implications of correctly diagnosing persistent delusional disorder.

Main Methods:

• Case report of a patient initially diagnosed with psychotic depression.
• Review of treatment response to sertraline and olanzapine.
• Diagnostic re-evaluation based on symptom progression and coherence of delusions.
• Initiation of clozapine treatment.

Main Results:

• The patient showed no improvement with sertraline and olanzapine.
• Psychotic features became more prominent, with persistent delusions of poverty.
• Diagnosis was revised to persistent delusional disorder with subsequent mood disorder.
• Treatment with clozapine resulted in gradual psychosis withdrawal and affective normalization.

Conclusions:

• Accurate differential diagnosis is critical for managing complex psychiatric presentations.
• The sequence of symptom development is a key factor in distinguishing psychotic depression from delusional disorders.
• Clozapine can be effective in treating persistent delusional disorder with mood comorbidity.