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[Correlations between crystalluria and composition of calculi]
Z Kaid-Omar1, M Daudon, A Attar
1Institut de Chimie Industrielle, Centre Universitaire, Mostaganem, Algérie.
Summary
Analyzing urine crystals (crystalluria) can help predict kidney stone composition. This aids in selecting the best treatment for kidney calculi, improving extracorporeal shock wave lithotripsy outcomes.
Area of Science:
- Urology
- Nephrology
- Crystallography
Background:
- Kidney stone fragmentation by extracorporeal shock wave lithotripsy (ESWL) depends on stone composition.
- Incomplete fragmentation may necessitate further urological procedures.
- Pre-treatment X-rays are insufficient to identify stone crystalline phases influencing ESWL resistance.
Purpose of the Study:
- To compare crystalluria and kidney stone composition in patients.
- To assess the predictive value of crystalluria for stone composition.
Main Methods:
- Seventy-five patients with kidney calculi were included.
- First morning urine was collected before stone removal.
- Urine samples were analyzed for crystalline species.
Main Results:
- Crystalluria was detected in 97.3% of specimens.
- Weddellite was the most common urinary crystal (66.2%), followed by carbapatite (33.1%) and whewellite (23.1%).
- Urinary crystal composition correlated with stone composition, with high accuracy for weddellite, whewellite, and struvite stones.
Conclusions:
- Crystalluria analysis can predict the main crystalline phase of calcium-containing kidney stones.
- This prediction can guide the selection of optimal stone removal procedures.
- Crystalluria studies offer clinical value in managing kidney calculi.