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Cystinuria.

D S Milliner1

  • 1Mayo Medical School, Rochester, Minnesota.

Endocrinology and Metabolism Clinics of North America
|December 1, 1990
PubMed
Summary
This summary is machine-generated.

Cystinuria is a genetic disorder causing excessive urinary cystine excretion, leading to kidney stones. This study classifies cystinuria types based on intestinal transport defects and proposes diagnostic and therapeutic strategies.

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Area of Science:

  • Nephrology
  • Medical Genetics
  • Biochemistry

Background:

  • Cystinuria is an inherited renal and intestinal transport disorder.
  • It is characterized by excessive urinary excretion of specific amino acids, including cystine.
  • This leads to the formation of cystine urolithiasis, a significant cause of morbidity.

Purpose of the Study:

  • To classify homozygous cystinuric subjects into distinct groups based on intestinal transport.
  • To outline diagnostic criteria and screening methods for cystinuria.
  • To review current medical and surgical management strategies for cystine urolithiasis.

Main Methods:

  • Analysis of plasma response to oral cystine loading.
  • Assessment of intestinal mucosal transport patterns for cystine and dibasic amino acids.

Related Experiment Videos

  • Quantification of urinary cystine excretion and creatinine levels.

    • Main Results:

    • Three distinct types of homozygous cystinuria (I, II, III) were identified based on transport defects.
    • Type I shows no active transport, Type II has markedly reduced cystine transport, and Type III has diminished absorption.
    • Diagnostic screening tests like sodium cyanide nitroprusside and urinary amino acid quantification are crucial.

    Conclusions:

    • Accurate classification of cystinuria types aids in understanding disease mechanisms.
    • Early diagnosis and appropriate management, including fluid intake, dietary changes, and medication, are essential for preventing stone recurrence.
    • Surgical intervention may be necessary for complicated cases of cystine urolithiasis.