The Effect of American Society of Anesthesiology Scores on Percutaneous Nephrolithotomy Outcomes

Abstract

Introduction: To evaluate the effect of American Society of Anesthesiology (ASA) scores on percutaneous nephrolithotomy (PNL) outcomes. Materials and 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. Results and 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.