Cystinuria-a urologist's perspective
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Published on: March 31, 2023
Kay Thomas1, Kathie Wong1, John Withington1
1The Urology Centre, Guy's and St Thomas' NHS Foundation Trust London, Guy's Hospital, Great Maze Pond, London SE1 9RT, UK.
Insights
Cystinuria, a genetic disorder causing frequent kidney stones, requires early suspicion in young patients with recurrent stone formation. Management involves a multidisciplinary approach including diet, medication, and timely surgical intervention.
Area of Science:
- Nephrology
- Genetics
- Urology
Background:
- Cystinuria is a hereditary condition characterized by recurrent kidney stone formation.
- Early diagnosis is crucial, especially in individuals under 30 or with a family history of stones.
Purpose of the Study:
- To outline the diagnostic considerations for cystinuria.
- To describe current and future management strategies for cystinuria patients.
- To highlight ongoing research directions in cystinuria.
Main Methods:
- Clinical suspicion based on patient demographics and family history.
- Multidisciplinary approach involving urologists and dietitians.
- Pharmacological interventions including urine alkalinization and thiol-binding drugs.
- Surgical management tailored to stone size and complexity.
Main Results:
- Dietary modifications and specialist dietician review aid in stone prevention.
- Medical therapies can be effective for patients unresponsive to lifestyle changes.
- Minimally invasive surgery is recommended for smaller stones, with multimodal approaches for complex cases.
Conclusions:
- A high index of suspicion is vital for diagnosing cystinuria in at-risk populations.
- Comprehensive management integrating lifestyle, medical, and surgical interventions is essential.
- Future research, fostered by collaborative efforts, aims to improve disease monitoring and therapeutic options.
Abstract:
Cystinuria is a genetic disease that leads to frequent formation of stones. In patients with recurrent stone formation, particularly patients <30 years old or those who have siblings with stone disease, urologists should maintain a high index of suspicion of the diagnosis of cystinuria. Patients with cystinuria require frequent follow-up and a multidisciplinary approach to diagnosis, prevention and management. Patients have reported success in preventing stone episodes by maintaining dietary changes using a tailored review from a specialist dietician. For patients who do not respond to conservative lifestyle measures, medical therapy to alkalinize urine and thiol-binding drugs can help. A pre-emptive approach to the surgical management of cystine stones is recommended by treating smaller stones with minimally invasive techniques before they enlarge to a size that makes management difficult. However, a multimodal approach can be required for larger complex stones. Current cystinuria research is focused on methods of monitoring disease activity, novel drug therapies and genotype-phenotype studies. The future of research is collaboration at a national and international level, facilitated by groups such as the Rare Kidney Stone Consortium and the UK Registry of Rare Kidney Diseases.
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