title: The effect of abdominal fat parameters on percutaneous nephrolithotomy success.
abstract: BACKGROUND
  Obesity has been suggested to lower the success of percutaneous nephrolithotomy (PCNL). However, the relationship between abdominal fat parameters, such as visceral and subcutaneous abdominal adipose tissue, and PCNL success remained unclear. In this study, we aimed to investigate the effect of abdominal fat parameters on PCNL success.
  
  
  METHODS
  A total of 150 patients who underwent PCNL were retrospectively enrolled in this study. Group 1 consisted of patients who had no residual stones or residual stone fragments <3 mm in diameter while group 2 included patients with residual stone fragments ≥3 mm. PCNL procedure was defined as successful if all stones were eliminated or if there were residual stone fragments <3 mm in diameter confirmed by non-contrast computed tomography (NCCT) performed postoperatively. Preoperative NCCT was used to determine abdominal fat parameters.
  
  
  RESULTS
  Group 1 consisted of 117 (78.0%) patients while group 2 included 33 (22.0%) patients. On univariate analysis, stone number, stone surface area (SSA), visceral fat area (VFA), abdominal circumference on computerized tomography (ACCT), and duration of procedure were found to be predictive factors affecting PCNL success. Logistic regression analysis revealed that ACCT and SSA were independent prognostic factors for PCNL success.
  
  
  CONCLUSIONS
  PCNL success was not affected by VFA, subcutaneous fat area (SFA) and body mass index (BMI) in our series. However, ACCT and SSA had negative associations with PCNL success. We conclude that both ACCT and SSA can be used as tools for predicting PCNL outcomes.
authors.affiliation: Tepecik Training and Research Hospital, Urology Department, Izmir, Turkey;
authors.forename: Ozgur
authors.initials: O
authors.lastname: Cakmak
authors.affiliation: Tepecik Training and Research Hospital, Urology Department, Izmir, Turkey;
authors.forename: Huseyin
authors.initials: H
authors.lastname: Tarhan
authors.affiliation: Dalhousie University, Department of Urology, Queen Elizabeth II Health Sciences Centre, Halifax, NS, Canada;
authors.forename: Sertac
authors.initials: S
authors.lastname: Cimen
authors.affiliation: Tepecik Training and Research Hospital, Urology Department, Izmir, Turkey;
authors.forename: Rahmi Gokhan
authors.initials: RG
authors.lastname: Ekin
authors.affiliation: Kemalpasa State Hospital, Urology Department, Izmir, Turkey.
authors.forename: Ilker
authors.initials: I
authors.lastname: Akarken
authors.affiliation: Tepecik Training and Research Hospital, Urology Department, Izmir, Turkey;
authors.forename: Ozgur
authors.initials: O
authors.lastname: Oztekin
authors.affiliation: Tepecik Training and Research Hospital, Urology Department, Izmir, Turkey;
authors.forename: Ertan
authors.initials: E
authors.lastname: Can
authors.affiliation: Tepecik Training and Research Hospital, Urology Department, Izmir, Turkey;
authors.forename: Tufan
authors.initials: T
authors.lastname: Suelozgen
authors.affiliation: Tepecik Training and Research Hospital, Urology Department, Izmir, Turkey;
authors.forename: Yusuf Ozlem
authors.initials: YO
authors.lastname: Ilbey