RELATIONSHIP BETWEEN UREASE-PRODUCING BACTERIA, URINARY PH AND ENCRUSTATION ON INDWELLING URINARY CATHETERS

被引:46
作者
HEDELIN, H [1 ]
BRATT, CG [1 ]
ECKERDAL, G [1 ]
LINCOLN, K [1 ]
机构
[1] HOGSBO SJUKHUS,DEPT LONG TERM CARE & REHABIL,GOTHENBURG,SWEDEN
来源
BRITISH JOURNAL OF UROLOGY | 1991年 / 67卷 / 05期
关键词
D O I
10.1111/j.1464-410X.1991.tb15200.x
中图分类号
R5 [内科学]; R69 [泌尿科学(泌尿生殖系疾病)];
学科分类号
1002 ; 100201 ;
摘要
In 11 patients with long-term indwelling catheters the amount of catheter encrusation 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.
引用
收藏
页码:527 / 531
页数:5
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