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Racial Differences in Risk Factors for Kidney Stone Formation
Anna L Zisman1, Fredric L Coe1, Andrew J Cohen2
1Department of Medicine, Section of Nephrology, University of Chicago, Chicago, Illinois.
Summary
Black individuals with kidney stones have lower urine volume and calcium excretion. Treatment increased urine volume but not free water excretion in this group, suggesting different stone formation mechanisms.
Area of Science:
- Nephrology
- Urology
- Metabolic Medicine
Background:
- Kidney stone disease incidence is increasing globally.
- Mechanisms of kidney stone formation may differ across racial groups.
- Research is needed to identify differing lithogenic risk factors in idiopathic nephrolithiasis.
Purpose of the Study:
- To identify differing lithogenic risk factors across racial groups in idiopathic nephrolithiasis.
- To compare metabolic risk factors between black and white idiopathic stone formers.
- To analyze pre- and post-treatment risk factors in different racial groups.
Main Methods:
- Retrospective cohort study of black and white idiopathic stone formers.
- Comparison of serum and urine metabolic risk factors using analysis of covariance.
- Generalized linear modeling to assess risk factors for stone formation.
Main Results:
- Black stone formers exhibited lower urine volume (1.4 L/d vs. 2.0 L/d) and urine calcium excretion (116 mg/d vs. 217 mg/d).
- Uric acid supersaturation was higher in black stone formers, while calcium phosphate supersaturation was higher in white stone formers.
- Post-treatment, urine volume increased in both groups, but electrolyte free water clearance remained lower in black stone formers.
Conclusions:
- Black stone formers present with lower 24-hour urine calcium and reduced urine volume.
- Treatment-induced increases in urine volume in black stone formers correlated with increased solute excretion, not free water excretion.
- Findings suggest distinct lithogenic risk factors and physiological responses to treatment across racial groups in kidney stone disease.
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