Objective:To evaluate the risk factors of systemic inflammatory response syndrome(SIRS)after flexible ureteroscopic lithotripsy(FUL).Method:Data from 260 patients who underwent FUL from October 2012 to November 2014 were retrospectively reviewed.The potentially risk factors of SIRS,such as age,sex,BMI,stone size,urinary tract infection,hydronephrosis,perfusion,ureteral access sheath,operation time,stone composition,et al were compared with univariate test in patients who developed postoperative SIRS.Then mu...