Diagnostics discrepancies between ICD-10 and DSM-IV in personality disorders

Area of Science:

• Psychiatry
• Clinical Psychology
• Diagnostic Systems

Background:

• Personality disorders are prevalent, affecting 50% of mental health clinic patients.
• Accurate diagnosis is crucial for patient prognosis and treatment planning.
• Clinicians often favor one diagnostic system (ICD-10 or DSM-IV) over the other.

Purpose of the Study:

• To assess the concordance between the DSM-IV and ICD-10 nosologies for personality disorder diagnosis.
• To investigate the impact of differing diagnostic criteria on patient classification.

Main Methods:

• A study involving 248 patients with anxiety or depressive disorders.
• Administration of the International Personality Disorders Examination (IPDE) Screening Questionnaire in both DSM-IV and ICD-10 versions.
• Observational analysis of positive diagnoses and comorbidity rates.

Main Results:

• The DSM-IV version yielded more positive diagnoses and indicated higher comorbidity compared to the ICD-10.
• Qualitative differences, such as the exclusion of certain disorders in ICD-10 and subdivision of others, contribute to discrepancies.
• The female population predominated in both anxiety and depressive disorder groups.

Conclusions:

• Substantial diagnostic discrepancies between DSM-IV and ICD-10 for personality disorders were observed.
• The study raises questions about potential overdiagnosis by DSM-IV or underdiagnosis by ICD-10.
• Recommendations are made for the World Health Organization and American Psychiatric Association to unify diagnostic categories and criteria in future nosologies.