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Related Experiment Videos

Study of calcium phosphate crystalluria.

K Tozuka, Y Yonese, T Konjiki

    The Journal of Urology
    |August 1, 1987
    PubMed
    Summary

    Calcium phosphate crystalluria is common in healthy individuals and kidney stone patients. However, it is significantly more frequent in patients with calcium urolithiasis requiring surgery, suggesting its role in stone formation.

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    Area of Science:

    • Nephrology
    • Urology
    • Biochemistry

    Background:

    • Calcium oxalate stones are common, but the role of calcium phosphate crystalluria in stone formation is less understood.
    • Understanding crystalluria is crucial for diagnosing and managing urolithiasis.

    Purpose of the Study:

    • To investigate the frequency of calcium phosphate crystalluria in healthy individuals and patients with calcium urolithiasis.
    • To analyze the composition and morphology of calcium phosphate precipitates in urine.

    Main Methods:

    • Comparative analysis of postprandial urine specimens from healthy individuals and kidney stone patients.
    • Characterization of urinary precipitates using infrared, X-ray, thermal, and electron probe analyses.

    Main Results:

    • No significant difference in calcium phosphate crystalluria between healthy individuals and all calcium urolithiasis patients.
    • Significantly higher frequency of crystalluria in calcium stone patients requiring surgery compared to healthy individuals.
    • Calcium phosphate precipitates were primarily poorly crystallized apatite with organic material, forming aggregates of spherules.

    Conclusions:

    • Calcium phosphate crystalluria, similar to calcium oxalate crystalluria, may play a significant role in the pathogenesis of urinary stones.
    • The findings suggest that calcium phosphate crystalluria could be a relevant factor in surgical intervention decisions for calcium stone disease.

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