title: External Comparison of Recent Predictive Nomograms for Stone-Free Rate Using Retrograde Flexible Ureteroscopy with Laser Lithotripsy.
abstract: To assess and compare the applicability of the Resorlu-Unsal Stone Score (RUSS) and the Modified Seoul National University Renal Stone Complexity (S-ReSC) score for flexible ureterorenoscopy (f-URS).
  
  
  
  We retrospectively analyzed the hospital files of 719 patients who had been treated with f-URS for kidney stone at two referral centers between July 2012 and December 2015. The RUSS and Modified S-ReSC scores were calculated by the same surgeon for each patient by using imaging methods and were compared as to their predictive capability for postoperative success.
  
  
  
  A total of 339 patients (168 men and 171 women) with a mean age of 46.5 ± 16.1 (range:1-86) years and a mean body mass index of 27.1 ± 4.1 (range: 12.8-38.5) were included in the study. The mean stone size was 14.4 ± 5.4 (4-40) mm, and the mean stone surface area was 145.3 ± 76.8 (20-658) mm2. The overall stone-free rate was 70.1%. The mean scores were 0.5 ± 0.7 and 1.8 ± 1.1 for the RUSS and Modified S-ReSC, respectively. In the logistic regression analysis, musculoskeletal deformity, stone size, and the RUSS were identified as independent predictive factors affecting stone-free status (p: 0, p: 0.014, p: 0.048, respectively). Among these parameters, the RUSS had the highest predictive capability (area under curve value 0.65, [95% confidence interval 589, 721]).
  
  
  
  Stone size, presence of musculoskeletal abnormalities, and the RUSS score are important factors affecting SF status after f-URS. Despite the RUSS being an independent predictive factor for SF status, more comprehensive systems with higher predictive capability are needed for clinical usage and academic reporting.
authors.affiliation: 1 Department of Urology, Haseki Training and Research Hospital , Istanbul, Turkey .
authors.forename: Akif
authors.initials: A
authors.lastname: Erbin
authors.affiliation: 2 Faculty of Medicine, Department of Urology, Bezmialem Vakif University , Istanbul, Turkey .
authors.forename: Abdulkadir
authors.initials: A
authors.lastname: Tepeler
authors.affiliation: 3 Department of Urology, Medova Hospital , Konya, Turkey .
authors.forename: Ibrahim
authors.initials: I
authors.lastname: Buldu
authors.affiliation: 1 Department of Urology, Haseki Training and Research Hospital , Istanbul, Turkey .
authors.forename: Harun
authors.initials: H
authors.lastname: Ozdemir
authors.affiliation: 2 Faculty of Medicine, Department of Urology, Bezmialem Vakif University , Istanbul, Turkey .
authors.forename: Muhammet
authors.initials: M
authors.lastname: Tosun
authors.affiliation: 1 Department of Urology, Haseki Training and Research Hospital , Istanbul, Turkey .
authors.forename: Murat
authors.initials: M
authors.lastname: Binbay
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019540:Area Under Curve; D015992:Body Mass Index; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D007669:Kidney Calculi / Q000601:surgery*; D017602:Lithotripsy, Laser / Q000379:methods*; D008297:Male; D008875:Middle Aged; D049451:Nomograms; D011184:Postoperative Period; D012017:Referral and Consultation; D012189:Retrospective Studies; D016896:Treatment Outcome; D020709:Ureteroscopes; D018666:Ureteroscopy / Q000379:methods*; D055815:Young Adult
keywords: flexible ureteroscopy; kidney stone; scoring system; success rate