Oral potassium citrate treatment for idiopathic hypocitruria in children with calcium urolithiasis.

PURPOSE

We evaluated the clinical and laboratory outcome of oral potassium citrate treatment in children with idiopathic hypocitruria and calcium stones.

MATERIALS AND METHODS

The charts of 64 children 1 to 15 years old with hypocitruria and calcium stones (median age 7.2) treated with oral potassium citrate were reviewed. Evaluation parameters were tolerability, adverse reactions, metabolic profile and stone recurrence.

RESULTS

No serious adverse reaction due to potassium citrate administration was recorded. Normal citrate excretion was restored in all patients. After treatment median urinary citrate daily plus or minus SD increased from 197 +/- 72 to 632 +/- 218 mg./1.73 m.2 (p <0.001) and mean urinary pH increased from 5.3 +/- 0.3 to 6.2 +/- 0.7 (p <0.01). Mean calcium excretion decreased from 3.5 +/- 2.7 to 2.5 +/- 2.7 mg./kg. (p <0.05). At an average followup of 22 months (range 3 to 67) the recurrence rate in the group overall was 0.07 per patient-year. The previous recurrence rate of 0.32 per patient-year in the 20 children with a history of recurrent stone disease decreased to 0.17 per patient-year after treatment. None of the 44 initial stone formers had recurrent stones.

CONCLUSIONS

Our results show the safety and efficacy of oral potassium citrate treatment for restoring normal urinary citrate and suggest a preventive effect for recurrent calcium stone disease in children with hypocitruria and calcium stones.