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Alpha-mercaptopropionylglycine (MPG) effectively treats cystinuria in children, but high doses may cause nephrotic syndrome. Urine alkalinization and dilution are crucial for managing this condition.
Area of Science:
- Pediatric Nephrology
- Urology
Background:
- Cystinuria is a genetic disorder characterized by the formation of renal calculi (kidney stones).
- Management of cystinuria in children requires effective therapeutic strategies to prevent stone recurrence and complications.
Purpose of the Study:
- To evaluate the efficacy and safety of alpha-mercaptopropionylglycine (MPG) in pediatric patients with cystinuria and renal calculi.
- To identify factors contributing to treatment failure and recurrence in a pediatric cohort.
Main Methods:
- Retrospective analysis of 7 pediatric patients diagnosed with cystinuria and renal calculi.
- Assessment of treatment outcomes including surgical intervention and alpha-mercaptopropionylglycine (MPG) therapy.
- Monitoring of urinary cystine levels and adverse events.
Main Results:
- Satisfactory results were achieved in 5 out of 7 children treated with a combination of surgical intervention and MPG.
- Recurrences were observed in 2 children, with underlying causes discussed.
- MPG therapy demonstrated efficacy but was associated with nephrotic syndrome at doses exceeding 50 mg/kg/day.
- Urinary cystine levels below 200 mg/day were not always indicative of safety in children.
Conclusions:
- Alpha-mercaptopropionylglycine (MPG) is an effective treatment for pediatric cystinuria, but careful dose monitoring is essential to avoid adverse effects like nephrotic syndrome.
- Urine alkalinization and dilution remain fundamental components of cystinuria management in children.
- Further investigation into the causes of recurrence is warranted to optimize long-term treatment strategies.
Abstract:
7 children, 20 months to 11 years old, with cystinuria and renal calculi were studied. Surgical treatment and alpha-mercaptopropionylglycine (MPG) gave satisfactory results in 5 children. The causes of the recurrences in the other 2 children are discussed. MPG therapy is effective but can cause a nephrotic syndrome at a dose of more than 50 mg/kg/day. A cystinuria of less than 200 mg/day cannot always be considered safe in children. The alkalinization and dilution of urine remain extremely important in the treatment of cystinuria.