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Urinary pH and the indwelling catheter

A Norberg, B Norberg, K Lundbeck

    Upsala Journal of Medical Sciences
    |January 1, 1980
    PubMed
    Summary
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    Urine pH increases in blocked urinary catheters, indicating alkaline changes likely caused by ammonia production from Proteus bacteria. This finding is significant for understanding catheter-associated urinary tract infections.

    Area of Science:

    • Urology
    • Microbiology
    • Biochemistry

    Background:

    • Indwelling urinary catheters are prone to blockage and infection.
    • Urinary pH changes can impact catheter patency and infection risk.
    • Proteus species are known to produce urease, an enzyme that hydrolyzes urea into ammonia.

    Purpose of the Study:

    • To investigate the pH changes of urine within blocked indwelling catheters.
    • To explore the potential role of bacterial activity in altering urinary pH.
    • To determine if a pH gradient exists within indwelling catheters.

    Main Methods:

    • Comparison of urine pH from blocked indwelling catheters versus new catheters.
    • Measurement of urine pH under controlled conditions to minimize circadian variations.

    Related Experiment Videos

  • Analysis of potential microbial influence on urinary pH.

    • Main Results:

    • Significantly higher urine pH was observed in blocked indwelling catheters compared to new ones.
    • A pH gradient was detected within the catheter system.
    • The alkaline shift suggests ammonia production, likely from urease-positive bacteria like Proteus.

    Conclusions:

    • Urinary pH increases in a clinically significant alkaline direction within blocked indwelling catheters.
    • Urease-producing bacteria, such as Proteus strains, are probable causative agents for this pH shift.
    • This pH alteration may contribute to catheter encrustation and blockage.