Differentiating narcissistic and antisocial personality disorders

Area of Science:

• Psychiatry
• Clinical Psychology
• Personality Disorders

Background:

• Narcissistic personality disorder (NPD) and antisocial personality disorder (ASPD) exhibit significant conceptual, clinical, and empirical overlap.
• Existing diagnostic systems, such as the DSM-IV, maintain separate categories for NPD and ASPD.
• Understanding the discriminability between these disorders is crucial for accurate diagnosis and treatment.

Purpose of the Study:

• To review the overlap between NPD and ASPD.
• To investigate the descriptive discriminability between NPD and ASPD.
• To assess pathological narcissism in patients diagnosed with NPD and ASPD.

Main Methods:

• A comparative study involving 24 patients with NPD and 16 patients with ASPD.
• Assessment of 33 characteristics related to pathological narcissism using the semistructured Diagnostic Interview for Narcissism.
• Statistical comparison of the two patient groups.

Main Results:

• Significant similarities were found between NPD and ASPD, questioning the necessity of maintaining them as separate categories.
• Key differences were identified, with grandiosity (exaggeration of talents, sense of uniqueness and superiority) being the most effective characteristic in discriminating NPD from ASPD.
• The findings underscore the complexity of differentiating these personality disorders.

Conclusions:

• The substantial overlap between NPD and ASPD warrants further discussion regarding their diagnostic classification.
• Grandiosity emerges as a critical distinguishing feature of NPD compared to ASPD.
• Continued research is needed to refine diagnostic criteria and improve the differentiation of these related personality disorders.