The use of polymixin B as a urethral lubricant to reduce the post-instrumental incidence of bacteriuria in females. An exploratory study.
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A randomized prospective trial compared the effect on the bacterial flora of the urine of the instillation of chlorhexidine or of normal saline into the bladder of two groups of elderly patients with indwelling urinary catheters. There was no reduction in urinary bacterial count in either group of patients.
During an 11-month prospective study, urine cultures were performed on 5685 samples obtained in three hospital units. The use of a selective medium improved the recovery of antibiotic-multiresistant corynebacteria (AMC): 703 isolates (12.4%) compared with 88 isolates (1.6%) on sheep blood agar. Corynebacterium group D2 (CGD2) was isolated in 80.5% of urines yielding greater than or equal to 10(5) AMC ml-1 whereas Corynebacterium jeikeium represented 80.2% of isolates with less than 10(5) AMC ml-1. Among 16 patients with greater than or equal to 10(5) ml-1 C. jeikeium none had signs of urinary tract infection. In contrast, among 56 patients with greater than or equal to 10(5) CGD2, 40 (71%) had abnormal urinary sediment (mainly apatite or struvite crystals) and 29 (52%) had clinical signs of urinary tract infections sometimes complicated by lithiasis (seven cases) and alkaline-encrusted cystitis (two cases).
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