Relationship between Urease-producing Bacteria, Urinary pH and Encrustation on Indwelling Urinary Catheters
| Autor: | G. Eckerdal, K. Lincoln, C.-G. Bratt, H. Hedelin |
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| Rok vydání: | 1991 |
| Předmět: |
Male
medicine.medical_specialty Time Factors Urease Urology Urinary system Urine chemistry.chemical_compound Catheters Indwelling medicine Humans Proteus mirabilis Aged Aged 80 and over Urinary bladder Bacteria biology business.industry Hydrogen-Ion Concentration Phosphate biology.organism_classification Surgery Catheter medicine.anatomical_structure chemistry biology.protein Female Urinary Catheterization business |
| Zdroj: | British Journal of Urology. 67:527-531 |
| ISSN: | 1464-410X 0007-1331 |
| Popis: | In 11 patients with long-term indwelling catheters the amount of catheter encrustation and urinary pH were measured and the urine regularly cultured over a prolonged period of time (median of 7 periods of 3 weeks). The mean urinary pH was related to the persistent presence of urease-producing micro-organisms (P. mirabilis) and urinary pH governed the precipitation of catheter encrustation. The critical pH appeared to be around 6.8. In patients with a mean urinary pH below this level the encrustation was minute (less than or equal to 2.9 mg phosphate). In patients with a mean urinary pH above 6.8 it was considerable but with a marked interindividual variation (35.5-138.7 mg phosphate). The composition of the encrustation was also strongly pH-related, with a much higher proportion present as magnesium ammonium phosphate in patients with a mean urinary pH above 6.8. The persistent presence of urease producers was not associated with a high pH or a more pronounced precipitation of phosphate in all patients. The amount of encrustation thus appears to depend not only on the presence of urease-producing micro-organisms but also on individual factors such as urinary composition. |
| Databáze: | OpenAIRE |
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