Background and Aims
We present a case of a 7-month old boy that was diagnosed with transient pseudohypoaldosteronism after detecting severe electrolyte disturbances together with urinary tract infection. On examination he was in poor state due to failure to thrive and severe atopic dermatitis. Life-threatening hyperkalaemia together with severe hyponatraemia and hypochloraemia were found together with highly elevated level of aldosterone. Urine culture showed Staphylococcal infection. Antibacterial treatment together with oral and intravenous saline was started as an initial therapy. Patient’s electrolytes became normal several days later. He started gaining weight and was discharged home with additional 500 grams of weight and better skin condition. After discharge, patient had several exacerbations of UTI with the same symptoms (failure to thrive, lethargy, anxiety), and electrolyte and homeostasis disturbances. 
The aim of our case report is to raise awareness about transient pseudohypoaldosteronism (PHA), that is a rare but important syndrome to recognize since simple but effective treatment leads to good outcomes.

Method
We report a case of 1 patient that was treated in Vilnius University Children Hospital.

Results
The outcome of the patient was good due to correect diagnosis and proper initiative treatment. 

Conclusion
Transient PHA could mimic congenital adrenal hypertrophy, especially in newborns and babies with electrolyte disturbances, such as hyperkalaemia, hyponatraemia. The syndrome shows rapid response to initial antibacterial treatment together with electrolyte correction. In our opinion, serum electrolytes should be obtained for all children suffering from UTIs, since it is a relatively cheap and informative analysis.

A CASE OF A LIFE-THREATENING ELECTROLYTE DISTURBANCE IN A CHILD WITH URINARY TRACT INFECTION