Pseudo Bartter Syndrome in anorexia nervosa

Area of Science:

• Nephrology
• Psychiatry
• Genetics

Background:

• Anorexia nervosa presents with non-psychiatric complications due to self-induced malnutrition and purging behaviors.
• These medical issues can mimic other conditions, complicating eating disorder diagnosis.

Observation:

• A patient with binge-eating/purging anorexia nervosa secretly abused diuretics, leading to recurrent, severe hypokalemia.
• Extensive investigations for chronic hypokalemia and metabolic disturbances, including genetic testing for Bartter Syndrome, were conducted.
• The patient was hospitalized in a nephrology service before receiving psychiatric and eating disorder unit care.

Findings:

• Diuretic abuse caused metabolic disturbances mimicking hereditary tubulopathies like Bartter Syndrome.
• A coincidental gene mutation linked to Bartter Syndrome was insufficient to confirm the diagnosis, indicating pseudo Bartter Syndrome.
• Delayed recognition of anorexia nervosa and diuretic abuse as the primary cause of disturbances.

Implications:

• Emphasizes the critical need for clinicians to recognize non-psychiatric manifestations of eating disorders.
• Highlights the importance of considering eating disorders in patients with unexplained electrolyte and metabolic abnormalities.
• Proper diagnosis and management require a multidisciplinary approach integrating psychiatric and medical care.