PubMed · 7111963
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E H Kass. How important is bacteriuria?. https://doi.org/10.1093/clinids%2F4.2.434
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PURPOSE: The long-term rate of stone recurrence following contemporary minimally invasive management of calculi was determined in patients with urinary diversion and to identify specific risk factors for these recurrences. MATERIALS AND METHODS: We followed for a minimum of 12 months 25 patients (29 renal units) with upper tract calculi associated with urinary diversion, and treated with extracorporeal shock wave lithotripsy and/or percutaneous nephrostolithotomy. The risk of recurrent stones at 5 years was determined by a Kaplan-Meier estimate, while potential risk factors for recurrence were analyzed using a log-rank comparison. RESULTS: Stones recurred in 8 patients (32%) 18 to 61 months (mean 27.0) after treatment. The risk of new stone formation after 5 years was estimated to be 63.3% and was significantly greater in patients with recurrent bacteriuria after treatment. Neither stone history, type of procedure used, stone composition nor radiographic status at completion of treatment significantly influenced this risk. CONCLUSIONS: Contemporary management of upper tract calculi in patients with a urinary diversion is associated with a high recurrence rate, especially among those with recurrent bacteriuria, regardless of whether the patient is initially rendered stone-free. Continued close surveillance and antibiotic prophylaxis seem to be essential in this high risk patient population.
A selective medium was incorporated into a new three-media dipslide (Uricult Trio, Orion Diagnostica) to allow rapid identification of Escherichia coli. The medium is supplemented with a recently described chromogenic substrate, hydroxyquinoline-beta-D-glucuronide, for beta-glucuronidase enzyme. The performance of the medium was compared to that of three other beta-glucuronidase detection methods in tests of 602 routine urine samples. Of 324 Escherichia coli strains isolated, 92% grew brown colonies on dipslide, thus being beta-glucuronidase positive. The proportion of beta-glucuronidase-positive Escherichia coli detected by the three methods was 93% for BGA II agar plates (Tammer-Tutka), 91% for PGUA tablets (Rosco) and 84% for Fluorocult Brolacin agar plates (Merck). No false-positive reactions were seen in the case of 209 significant isolates of species other than Escherichia coli grown on the selective medium.
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