[THE RISK FACTORS AND CHEMOPREVENTION OF FEBRILE URINARY TRACT INFECTION AFTER TRANSURETHRAL URETEROLITHOTRIPSY].

(Objectives) Transurethral Ureterolithotripsy (TUL) has become an increasingly more common treatment for ureteric stones since the reduction in ureteroscope diameter and other device improvements. At the same time, TUL sometimes shows postoperative febrile urinary tract infection (fUTI) with severe complications. Therefore we investigated the occurrence and risk factors of fUTI in our hospital, and assessed the effect of antibiotic prophylaxis prior to TUL. (Materials and methods) The subjects were 260 patients who underwent TUL in our department during the period from January 2011 to October 2014. We retrospectively reviewed the data of those who developed postoperative fUTI and identified the risk factors of postoperative fUTI. From November 2014 to August 2016, we enrolled 110 patients undergoing TUL with one or more risk factors in a prospective clinical trial of prophylactic oral levofloxacin (500 mg) for 1 week before TUL. The chi-squared test, Mann-Whitney U-test, and logistic regression analysis were used for data analysis (significance level of 0.05). (Results) Postoperative fUTI occurred in 43 (16.5%) of 260 patients. The risk factors of postoperative fUTI included preoperative pyelonephritis (P=0.02), preoperative ureteral stent placement (P=0.017), and operative time >90 min (P=0.005). Operative time was correlated with and could be substituted for pre-TUL stone size (P<0.0001). Chemopreventive therapy before TUL in patients with preoperative pyelonephritis, preoperative ureteral stent placement, or stones of >20 mm significantly reduced their risk of fUTI (P=0.012). (Conclusions) The use of antibiotic prophylaxis significantly reduces the risk of postoperative fUTI in patients with preoperative pyelonephritis, preoperative ureteral stent placement, or stones of >20 mm.