title: [Influence of ureter stenting before ureterorenoscopic treatment of ureteral calculi].
abstract: BACKGROUND
  Due to a worldwide rise of incidence, urolithiasis presents an increasing strain on the health system. Ureterorenoscopy (URS) is a standard treatment to extract stones in case of ureteral calculi. To increase the success rate of URS and to minimize complications, preoperative ureteral stenting (prestenting) has previously been described as suitable. However, published data are still conflicting. This article describes our single-center experience on the influence of prestenting on the outcome of ureterorenoscopic stone therapy.
  
  
  METHODS
  A total of 442 patients who had undergone ureterorenoscopic stone extraction at the Wolfsburg Clinic between 2010 and 2011 were retrospectively evaluated regarding peri- and postoperative results. The Fisher's exact, the χ(2), and the Mann-Whitney U test were used to compare the group of patients with and without prestenting.
  
  
  RESULTS
  Even though patients with prestenting suffered from stones with larger diameter that were more frequently located in the proximal ureter, the rates for postoperative stenting, perioperative complications, and retreatment were much lower then in the group of patients without prestenting (p<0.001). Furthermore, patients who had received prestenting had a significantly shorter hospital stay (median, 3 vs. 2 days, p<0.001) and higher rates of stone clearance (83.0 vs. 69.7%, p=0.001).
  
  
  CONCLUSIONS
  According to our retrospective monocentric analysis, prestenting may significantly reduce the risk of complications as well as intra-/post-URS restenting and can increase the rate of complete stone clearance.
authors.affiliation: Klinik für Urologie, Universitätsklinikum Münster, Münster, Deutschland.
authors.forename: J
authors.initials: J
authors.lastname: Mueller
authors.forename: N
authors.initials: N
authors.lastname: Riechert-Mühe
authors.forename: A J
authors.initials: AJ
authors.lastname: Schrader
authors.forename: A
authors.initials: A
authors.lastname: Leitenberger
authors.forename: J
authors.initials: J
authors.lastname: Steinestel
authors.forename: M A
authors.initials: MA
authors.lastname: Kuczyk
authors.forename: S
authors.initials: S
authors.lastname: Steffens
authors.forename: R
authors.initials: R
authors.lastname: Hofmann
authors.forename: J
authors.initials: J
authors.lastname: Sotelino
mesh_terms: D000328:Adult; D000368:Aged; D003131:Combined Modality Therapy / Q000295:instrumentation / Q000379:methods / Q000706:statistics & numerical data; D015897:Comorbidity; D005260:Female; D005858:Germany / Q000453:epidemiology; D006801:Humans; D007902:Length of Stay / Q000706:statistics & numerical data*; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000453:epidemiology*; D015995:Prevalence; D012189:Retrospective Studies; D015607:Stents / Q000706:statistics & numerical data*; D016896:Treatment Outcome; D014514:Ureteral Calculi / Q000453:epidemiology* / Q000473:pathology / Q000601:surgery*; D018666:Ureteroscopy / Q000706:statistics & numerical data*