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Some data on urinary stones which were passed.

D J Sutor, S E Wooley

    British Journal of Urology
    |April 1, 1975
    PubMed
    Summary

    Calcium oxalate stones are most likely to be passed by patients, especially younger ones. Infection stones have the lowest chance of expulsion and are typically the heaviest urinary calculi.

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    Area of Science:

    • Urology
    • Nephrology
    • Biochemistry

    Background:

    • Urinary calculi (kidney stones) affect a significant patient population.
    • Understanding factors influencing stone expulsion is crucial for patient management.
    • Stone composition and patient demographics are key considerations.

    Purpose of the Study:

    • To analyze the relationship between urinary calculi composition and spontaneous stone passage.
    • To identify specific stone types and patient characteristics associated with higher expulsion rates.
    • To compare the characteristics of passed stones with the overall stone population.

    Main Methods:

    • Retrospective analysis of 979 patients with urinary calculi.
    • Comparison of data from 175 patients who passed stones versus the entire cohort.
    • Statistical analysis of stone composition, weight, and patient age in relation to expulsion.

    Main Results:

    • Calcium oxalate stones showed the highest expulsion rate (1 in 3), particularly in patients under 50.
    • Calcium oxalate + calcium phosphate stones had a 1 in 5 expulsion probability, also higher in younger patients.
    • Infection stones (calcium phosphate + struvite) had a low expulsion rate (1 in 19).
    • Passed stones (130) were often under 0.10 g, with composition correlating to weight (oxalate lightest, infection heaviest).

    Conclusions:

    • Urinary stone composition significantly influences spontaneous passage likelihood.
    • Calcium oxalate stones are more prone to expulsion than infection stones.
    • Age is a factor, with younger patients exhibiting higher expulsion rates for certain stone types.

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