Acute and transient psychotic disorders versus persistent delusional disorders: a comparative longitudinal study.

Area of Science:

• Psychiatry
• Clinical Psychology

Background:

• Persistent delusional disorder (PDD) and acute and transient psychotic disorders (ATPD) are distinct ICD-10 diagnoses.
• Understanding their differences is crucial for accurate diagnosis and treatment.

Purpose of the Study:

• To investigate and compare PDD and ATPD in terms of demographics, symptomatic outcomes, and social consequences.
• To determine if these disorders represent separate entities within the psychotic spectrum.

Main Methods:

• A prospective, longitudinal study comparing 43 PDD inpatients with a cohort of 41 ATPD patients over a 14-year period.
• Data collection included semi-structured interviews for sociobiographical details and standardized instruments for follow-up assessments at 10-12 years post-onset.

Main Results:

• PDD patients, compared to ATPD, were older at onset, had fewer stressful life events preceding hospitalization, and exhibited persistent positive psychotic symptoms.
• ATPD patients showed a higher richness and variety of symptoms and a female predominance.
• PDD was associated with chronicity of delusional symptoms, lower global functioning, and fewer re-hospitalizations, while negative symptoms and loss of independence were infrequent in both.

Conclusions:

• PDD and ATPD differ significantly in multiple variables beyond symptom duration, supporting their classification as separate disorders.
• These findings suggest PDD and ATPD are distinct entities within the broader spectrum of psychotic disorders.