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Cystinuria in children

L Pavanello, G Rizzoni, N Dussini

    European Urology
    |January 1, 1981
    PubMed
    Summary
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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.

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    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.