title: The impact of body mass index on the outcomes of retrograde intrarenal stone surgery.
abstract: OBJECTIVE
  To compare the outcomes of using retrograde intrarenal surgery (RIRS) for treating renal stones among normal weight, overweight, and obese patients.
  
  
  METHODS
  From December 2008 to March 2012, 207 patients who underwent RIRS were included in the study. Patients were categorized into 3 groups according to their body mass index (BMI): normal weight <25 kg/m(2) (group 1), overweight 25-29.9 kg/m(2) (group 2), and obese ≥30 kg/m(2) (group 3). We compared the 3 groups with regard to preoperative characteristics, operative parameters, and postoperative outcomes.
  
  
  RESULTS
  There were no significant differences in age, gender, or renal stone parameters (size, localization, laterality, multiplicity) among the 3 groups. The mean stone sizes were 18.6 ± 7.1 mm in group 1, 16.9 ± 7.0 mm in group 2, and 18.5 ± 8.4 mm in group 3 (P = .365). The stone-free rates (SFRs) of a single procedure for the groups were 79.0%, 77.9%, and 75.5% for groups 1, 2, and 3, respectively (P = .897). After additional treatments, the final SFR for the groups increased to 85.2%, 84.4%, and 81.6% for groups 1, 2, and 3, respectively (P = .861). We did not find any significant differences among the groups with regard to the operation times, complication rates, and hospital length of stay (LOS). Major complications were not observed either during or after the operations.
  
  
  CONCLUSIONS
  Our study demonstrates that the outcomes of RIRS for treating renal stones are similar in overweight and obese patients when compared with patients who are of normal weight. Therefore, these patients can be treated safely and successfully with RIRS.
authors: Department of Urology, Istanbul Medeniyet University, Goztepe Training and Research Hospital, Istanbul, Turkey.
authors: Turhan
authors: T
authors: Caskurlu
authors: Gokhan
authors: G
authors: Atis
authors: Ozgur
authors: O
authors: Arikan
authors: Eyup Sabri
authors: ES
authors: Pelit
authors: Mert
authors: M
authors: Kilic
authors: Cenk
authors: C
authors: Gurbuz
mesh_terms: D000328:Adult; D015992:Body Mass Index; D005260:Female; D006801:Humans; D007669:Kidney Calculi / Q000150:complications / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000150:complications; D050177:Overweight / Q000150:complications; D012189:Retrospective Studies; D016896:Treatment Outcome; D013520:Urologic Surgical Procedures / Q000379:methods