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Correspondence between stone composition and urine supersaturation in nephrolithiasis
Kidney International
|March 1, 1997
Summary
Urine supersaturation (SS) measurements accurately reflect kidney stone composition and long-term averages. This finding supports using sparse urine SS tests to monitor and manage stone disease effectively.
Area of Science:
- Nephrology
- Urology
- Biochemistry
Background:
- Kidney stone formation is influenced by urine mineral supersaturation.
- Accurate assessment of long-term supersaturation is crucial for managing stone disease.
- Sparse urine measurements are often used due to practical limitations.
Purpose of the Study:
- To determine if short-term urine supersaturation (SS) measurements reflect long-term renal and urine SS values.
- To correlate urine SS with the mineral composition of kidney stones in patients.
- To assess the utility of SS measurements in monitoring treatment efficacy.
Main Methods:
- Compared 24-hour pretreatment urine supersaturation (calcium oxalate monohydrate, brushite, uric acid) with patient stone composition.
- Analyzed SS values in relation to sex-specific norms and stone composition.
- Correlated changes in SS with treatment outcomes and urine biochemistry (citrate, pH).
Main Results:
- Elevated SS levels corresponded to stone composition in both males and females.
- Effective stone treatments led to reduced SS values.
- Calcium phosphate admixture in stones correlated with decreased urine citrate and increased pH, suggesting renal tubular acidosis.
- Sparse SS measurements accurately matched stone mineral admixtures.
Conclusions:
- Sparse urine supersaturation measurements are reliable indicators of average renal and urine SS.
- These measurements accurately track kidney stone composition and admixtures.
- Urine SS monitoring is a valuable tool for managing kidney stone disease.
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