Cystinuria: clinical practice recommendation
Aude Servais1, Kay Thomas2, Luca Dello Strologo3
1Nephrology and Transplantation Department, Centre de Référence des Maladies Rénales Héréditaires de l'Enfant et de l'Adulte, Necker Hospital, APHP, Université de Paris, Paris, France.
Kidney International
|September 12, 2020
Summary
Cystinuria, a rare genetic disorder causing cystine stones, now has clinical practice recommendations. These guidelines cover diagnosis, surgical and medical treatments, and follow-up for affected individuals.
Area of Science:
- Nephrology
- Urology
- Medical Genetics
Background:
- Cystinuria is an autosomal recessive hereditary disorder characterized by excessive urinary cystine excretion.
- This leads to the formation of cystine stones due to cystine's low solubility at physiological urinary pH.
- The rarity of cystinuria and limited evidence necessitate clear clinical guidance.
Purpose of the Study:
- To develop comprehensive clinical practice recommendations for the diagnosis, treatment, and follow-up of patients with cystinuria.
- To provide expert consensus on managing this rare kidney stone disease in both pediatric and adult populations.
- To consolidate current knowledge and best practices for cystinuria management.
Main Methods:
- A consensus conference was held from January 2019, following a period of recommendation development from June 2018 to December 2019.
- Working groups conducted systematic literature reviews (MEDLINE) on specific cystinuria management topics.
- Recommendations were drafted, discussed, and finalized by a multidisciplinary expert panel.
Main Results:
- Twenty key statements were produced, offering guidance on diagnosis, genetic analysis, and imaging techniques.
- Recommendations cover surgical treatment indications and modalities, conservative management (hydration, diet, alkalinization, cystine-binding drugs), and follow-up protocols.
- Guidance addresses self-monitoring, complications like renal failure and hypertension, and quality of life impacts.
Conclusions:
- These clinical practice recommendations offer comprehensive guidance for managing cystinuria in adults and children.
- The recommendations address all facets of cystinuria care, from initial diagnosis through long-term management and complication monitoring.
- Despite limitations in evidence grading due to disease rarity, these statements provide essential direction for clinicians.
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