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Differences in 24-hour urine composition between apatite and brushite stone formers
Daniel M Moreira1, Justin I Friedlander, Christopher Hartman
1The Arthur Smith Institute for Urology, Hosftra North Shore-LIJ School of Medicine, New Hyde Park, NY.
Urology
|June 25, 2013
Summary
Brushite stone formers exhibit higher 24-hour urinary calcium excretion and calcium phosphate supersaturation compared to apatite stone formers. Reducing urinary calcium is key for preventing brushite (calcium phosphate) stones.
Area of Science:
- Nephrology
- Urology
- Biochemistry
Background:
- Calcium phosphate (CaP) kidney stones are broadly categorized into apatite and brushite subtypes.
- Understanding the distinct urinary profiles of these stone types is crucial for targeted prevention strategies.
Purpose of the Study:
- To investigate the differences in 24-hour urine composition between patients forming apatite stones and those forming brushite stones.
- To identify specific urinary markers associated with brushite stone formation.
Main Methods:
- A retrospective analysis of 110 CaP stone formers with available stone composition and 24-hour urinalysis data.
- Univariable and multivariable regression models were employed to compare urinary constituents, adjusting for clinical and demographic factors.
Main Results:
- Brushite stone formers showed significantly higher mean 24-hour urinary calcium excretion and calcium phosphate supersaturation (SS CaP) compared to apatite stone formers.
- Lower mean supersaturation of uric acid was observed in brushite stone formers.
- Urinary pH, volume, oxalate, citrate, and other electrolytes were similar between the two groups.
Conclusions:
- Brushite stones are associated with increased urinary calcium excretion and elevated SS CaP.
- Therapeutic strategies aimed at reducing urinary calcium levels may be particularly effective in preventing recurrent brushite stone formation.
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