title: Bacterial colonization of ureteral stents.
abstract: OBJECTIVE
  The aim of this study was to assess the frequency of bacterial stent colonization and stent-associated bacteriuria, and to evaluate the significance of urinary cultures for identification of colonizing microorganisms.
  
  
  METHODS
  A total of 93 ureteral stents from 71 patients were examined: 9 patients with permanent ureteral stenting due to malignant ureteral obstruction (27 stents), and 62 patients with temporary ureteral stents (66 stents).
  
  
  RESULTS
  Bacteriuria and bacterial stent colonization were found in all patients with permanent stents. In patients with temporary stents, colonized stents were found in 69.3% (43/62), mainly in combination with sterile urine (45.2%, 28/62). Mean indwelling times did not differ between patients with sterile urine and sterile stents (11.8 days) and patients with sterile urine and colonized stents (11.2 days). Prophylactic antibiosis in 42/62 temporarily stented patients did not reduce colonization rates compared to patients without antibiotics (70 vs. 65%). Enterococci were the bacteria most frequently cultured from urine and stents.
  
  
  CONCLUSIONS
  In the present study, ureteral stent colonization rates were 100% in permanently and 69.3% in temporarily stented patients. Antibiotic prophylaxis did not prevent stent colonization and should not be routinely administered. Since urinary cultures correctly identified all colonizing microorganisms in only 21%, removal/replacement and bacteriologic evaluation of ureteral stents may be necessary in case of urosepsis.
authors.affiliation: Department of Urology and Ludwig Boltzmann Institute for Andrology, Municipal Hospital Lainz, Vienna, Austria. reidlc@compuserve.com
authors.forename: C R
authors.initials: CR
authors.lastname: Riedl
authors.forename: E
authors.initials: E
authors.lastname: Plas
authors.forename: W A
authors.initials: WA
authors.lastname: Hübner
authors.forename: H
authors.initials: H
authors.lastname: Zimmerl
authors.forename: W
authors.initials: W
authors.lastname: Ulrich
authors.forename: H
authors.initials: H
authors.lastname: Pflüger
mesh_terms: D000328:Adult; D000368:Aged; D000900:Anti-Bacterial Agents / Q000627:therapeutic use; D019072:Antibiotic Prophylaxis; D001424:Bacterial Infections / Q000175:diagnosis / Q000453:epidemiology / Q000517:prevention & control*; D001437:Bacteriuria / Q000175:diagnosis / Q000188:drug therapy* / Q000453:epidemiology; D003114:Colony-Forming Units Assay; D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000175:diagnosis / Q000453:epidemiology / Q000517:prevention & control*; D011379:Prognosis; D011446:Prospective Studies; D018709:Statistics, Nonparametric; D015607:Stents / Q000009:adverse effects / Q000382:microbiology*; D016896:Treatment Outcome; D014517:Ureteral Obstruction / Q000188:drug therapy / Q000601:surgery*; D014556:Urine / Q000382:microbiology
chemical_list: D000900:Anti-Bacterial Agents