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[A bacteriological study on urinary calculi associated with infections].

O Yoshida, T Kiriyama, K Okada

    Hinyokika Kiyo. Acta Urologica Japonica
    |February 1, 1984
    PubMed
    Summary

    Urinary tract stones harbor bacteria, complicating infections. Antibiotic penetration into stones is poor, suggesting stones act as protected reservoirs for bacteria, hindering effective treatment.

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    Area of Science:

    • Urology
    • Infectious Diseases
    • Microbiology

    Background:

    • Urinary calculi (stones) associated with infections present significant management challenges.
    • Infection stones (e.g., struvite) and other types (e.g., calcium oxalate) can harbor bacteria.

    Purpose of the Study:

    • To conduct bacteriological studies on urinary calculi associated with infections.
    • To analyze bacteria on stone surfaces and within stones, stone composition, and antibiotic permeation.

    Main Methods:

    • Investigation of 120 cases of urinary calculi with infections.
    • Bacteriological analysis of stone surfaces and interiors.
    • Analysis of stone composition (MAP, CaP, CaOX).
    • Assessment of Cefmetazole antibiotic permeation into stones.

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    Main Results:

    • Proteus, E. coli, and Pseudomonas were frequently isolated from urine and stones.
    • Proteus mirabilis was prevalent on stone surfaces and within stones, particularly in MAP and CaP stones.
    • Bacteria were found within 25/33 stone specimens.
    • Antibiotic (Cefmetazole) concentration inside stones was often significantly lower than outside.

    Conclusions:

    • Urinary calculi can serve as sanctuaries for bacteria, protecting them from antibiotics.
    • Effective management requires considering bacteria within stones, not just in urine.