Optimal timing of ureteroscopic lithotripsy after the initial drainage treatment and risk factors for postoperative febrile urinary tract infection in patients with obstructive pyelonephritis: a retrospective study

Abstract Background A history of preoperative obstructive pyelonephritis has been reported as a risk factor for febrile urinary tract infection (fUTI) after ureteroscopic lithotripsy (URSL). But there is no clear evidence factors developing fUTI including the optimal timing URSL treatment. Methods Of 1361 patients, who underwent at our hospital from January 2011 to December 2017, 239 patients had pre-URSL pyelonephritis. The were analyzed by comparing patients’ backgrounds with presence or absence URSL. examined age, gender, body mass index, comorbidity, ureteral stent, stone position, laterality, size, Hounsfield unit (HU) value on computed tomography scan, sepsis during pyelonephritis, period antipyresis URSL, stenting period, operation time, and access sheath In addition, components renal pelvic culture bacterial species also examined. Results Post-URSL developed in 32 (13.4%), 11 these cases led (34.4%). Univariate analysis showed that maximum HU value, stent placement, time fUTI. Stone cultures not associated Multivariate placement > 21 days, 75 min independent following Conclusions F-UTI could be avoided days less