Purging disorder: a comparison to established eating disorders with purging behaviour

Area of Science:

• Psychiatry
• Clinical Psychology
• Eating Disorders Research

Background:

• Purging disorder (PurD) is a distinct eating disorder.
• Limited long-term data exists for PurD compared to anorexia nervosa binge eating/purging subtype (AN-bp) and bulimia nervosa purging subtype (BN-p).

Purpose of the Study:

• To compare the long-term course and clinical characteristics of patients with PurD, AN-bp, and BN-p.
• To identify predictors of treatment outcomes in these patient groups.

Main Methods:

• A comparative study of consecutively admitted patients with PurD (N=225), AN-bp (N=503), and BN-p (N=756).
• Self-rating questionnaires administered at admission, end of inpatient treatment, and 5-year follow-up.
• Analysis of diagnostic perseverance and mortality rates.

Main Results:

• Patients with PurD reported lower general psychopathology and eating disorder symptom severity on admission compared to AN-bp and BN-p.
• PurD patients showed less symptom improvement during treatment and higher diagnostic perseverance than AN-bp.
• PurD patients had higher mortality rates than BN-p patients.

Conclusions:

• Purging disorder has a distinct long-term course with less symptom improvement and higher mortality than some other eating disorders.
• Findings underscore the clinical relevance of PurD and the need for tailored treatment approaches.
• Predictors for treatment outcomes vary significantly across these eating disorder diagnoses.