Is a ureteral stent required after use of ureteral access sheath in presented patients who undergo flexible ureteroscopy?

INTRODUCTION Use of a ureteral access sheath (UAS) within flexible ureteroscopy (fURS) for the management of kidney and ureteral stones has shown improvements in its effectiveness, but it is also associated with increased risk of ureteral injury. Use of ureteral stent (US) after fURS is recommended by some authors, because of its role in reducing postoperative pain and preventing complications. Our objective is to determine if postoperative stenting is necessary in pre-stented patients that underwent fURS using UAS. MATERIAL AND METHODS A retrospective history review of patients who underwent fURS using UAS at our hospital between July 1st 2013 and May 31st 2016 was performed. Only pre-stented patients were included. All procedures were performed using the same UAS (Boston Navigator TM., 11-13 Fr.). Patients were separated according to the use or not of postoperative US. The same US (26 cm 6 Fr percuflex, Boston Scienfic) was used for all stented patients. Clinical parameters, stone demographics, operative time and postoperative events were analyzed. RESULTS Seventy patients met the inclusion criteria. Mean stone size was 8.5 mm (SD 7.06), 68.49% were located in the renal pelvis and 31.51% were in the proximal ureter. Reasons of preoperative stenting were: 14 (19.18%) ureteral stricture, 17 (23.29%) urosepsis, 29 (39.73%) residual stones after a first intervention (stage procedure) and 13 (17.8%) unsuccessful extracorporeal shockwave lithotripsy. Mean operative time was 88 minutes (SD 37.20); 32 patients (45.71%) were stented and 38 (54.28%) were not. There were no significant differences in operative time (p = 0.85) or postoperative outcomes (p = 1). CONCLUSIONS A postoperative ureteral stent is not necessary after fURS using UAS in pre-stented patients.