Psychoanalytic-Interactional Therapy versus Psychodynamic Therapy by Experts for Personality Disorders: A Randomized...

Area of Science:

• Psychiatry
• Clinical Psychology

Background:

• Limited evidence-based treatments exist for cluster B personality disorders beyond borderline personality disorder.
• Psychoanalytic-interactional therapy (PIT) is a transdiagnostic approach with demonstrated effectiveness in open studies.
• This study addresses the need for evidence-based treatments for severe personality disorders.

Purpose of the Study:

• To compare the efficacy of manual-guided PIT with expert-led psychodynamic therapy (E-PDT) for cluster B personality disorders.
• To evaluate treatment effectiveness against a control condition (treatment as usual or waitlist).
• To assess outcomes including personality organization, psychological distress, depression, anxiety, and interpersonal problems.

Main Methods:

• A randomized controlled trial was conducted in an inpatient setting.
• Patients with cluster B personality disorders were randomized to manual-guided PIT (n=64) or nonmanualized E-PDT (n=58).
• A quasi-experimental control group (n=46) received treatment as usual or was waitlisted.

Main Results:

• Control patients showed no significant improvements.
• Both PIT and E-PDT demonstrated significant improvements across all outcome measures.
• No significant differences in effectiveness were observed between PIT and E-PDT.
• Treatment outcomes were not influenced by the specific type of cluster B personality disorder.

Conclusions:

• Both PIT and E-PDT are effective treatments for cluster B personality disorders in an inpatient setting.
• PIT and E-PDT show comparable efficacy in treating these disorders.
• Further research is warranted to advance the treatment of cluster B personality disorders.