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Ammonium urate urinary stones.

M Klohn, J F Bolle, N P Reverdin

    Urological Research
    |January 1, 1986
    PubMed
    Summary
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    Ammonium urate stones, once common, now appear in developing nations due to uric acid and ammonium-rich urine. Treatment varies based on stone composition and pH, differing from uric acid stones.

    Area of Science:

    • Nephrology
    • Urology
    • Biochemistry

    Background:

    • Ammonium urate stones were prevalent in preindustrial Europe but are now common in developing countries.
    • These stones are associated with conditions leading to uric acid and ammonium-enriched urine.

    Observation:

    • Urealytic infection can cause mixed ammonium urate/magnesium ammonium phosphate precipitates.
    • Urinary phosphate deficiency from dietary causes can lead to precipitates free of magnesium ammonium phosphate in sterile urine.

    Findings:

    • Phosphate-poor diets and low fluid intake contribute to ammonium urate stone formation in endemic lithiasis areas.
    • Ammonium urate and uric acid exhibit distinct pH-dependent solubility patterns.

    Implications:

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    • Understanding the distinct solubility of ammonium urate and uric acid is crucial for effective treatment strategies.
    • Tailoring interventions based on stone composition and urinary pH is essential for managing ammonium urate urolithiasis.