title: The effect of American Society of Anesthesiology scores on percutaneous nephrolithotomy outcomes.
abstract: BACKGROUND
  To evaluate the effect of American Society of Anesthesiology (ASA) scores on percutaneous nephrolithotomy (PNL) outcomes.
  
  
  METHODS
  The records of 186 consecutive patients undergoing PNL procedures from 2006 to 2011 at a single institution were evaluated. Patients were divided into a low-risk group with a preoperative ASA of I or II and a high-risk group with ASA of III or IV. Postoperative complications were classified according to the modified Clavien classification system.
  
  
  CONCLUSIONS
  There were 140 cases in the low-risk and 46 cases in the high-risk groups. The mean operative time was 72 min (40-120 min) and 86 min (55-125 min) and the complication rates were 17.8 and 19.5% for the low- and high-risk groups, respectively. The average duration of nephrostomy tube drainage was 3.3 ± 1 and 4.2 ± 1.5 days for the low- and high-risk groups, respectively. Stone-free rates were 85 and 82% for the low- and high-risk groups, respectively. PNL can be safely performed in the ASA high-risk patient population.
authors.affiliation: Department of Urology, Baskent University School of Medicine, Ankara, Turkey. serdartoksoz@gmail.com
authors.forename: Serdar
authors.initials: S
authors.lastname: Toksoz
authors.forename: Ayhan
authors.initials: A
authors.lastname: Dirim
authors.forename: Yalcin
authors.initials: Y
authors.lastname: Kizilkan
authors.forename: Hakan
authors.initials: H
authors.lastname: Ozkardes
mesh_terms: D000368:Aged; D000776:Anesthesiology / Q000379:methods* / Q000592:standards*; D004322:Drainage / Q000009:adverse effects; D006801:Humans; D007669:Kidney Calculi / Q000601:surgery; D008875:Middle Aged; D009398:Nephrology / Q000379:methods* / Q000592:standards*; D009403:Nephrostomy, Percutaneous / Q000379:methods* / Q000592:standards*; D011183:Postoperative Complications / Q000517:prevention & control; D012306:Risk; D012955:Societies, Medical; D013997:Time Factors; D016896:Treatment Outcome