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Urol Int. 2019;102(2):175-180. doi: 10.1159/000494362. Epub 2018 Nov 9.

Analysis of Prestenting on Outcomes of Flexible Ureteroscopy for Upper Urinary Urolithiasis: A Historical Control Study.

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Department of Urology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China.
Department of Urology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China,



The aim of this study is to explore the efficacy and safety of flexible ureteroscopy (fURS) with prestenting (PS) for patients and a newly starting department.


The data of patients who underwent fURS for calculi with nonprestenting (NPS) after a clinical practice change was compared with PS patients before.


In all, 199 patients met the inclusion criteria. There was no significant difference for both groups in basic demography except that the NPS group included more proximal ureteral stone. Subgroup analysis was then used by a different site. There was no significance in sheath success (4/100 vs. 1/99, p = 0.369). Stone free rate (SFR) and success rate between PS and NPS group showed significant difference in total (96.94 vs. 89.58%, p = 0.048, 96.97 vs. 85.00%, p = 0.005 respectively). Better SFR and success rate were found only for the renal stones in subgroup analysis (97.67 vs. 80.49%, p = 0.014, 97.67 vs. 74.42%, p = 0.003 respectively). Operative time was significantly longer based on stenting status (45.969 ± 19.4732 vs. 30.553 ± 8.9645 min, p = 0.01) and there was no difference in subgroup analysis. More complications were found in the NPS group, but no severe complications were encountered.


Intentional PS is a feasible try for an amateur fURS surgeon or a newly started department in order to gain a better outcome and lower complications in the whole time. It improves the outcomes when additional small surgery is not the trouble.


Flexible ureteroscopy; Nonprestenting; Prestenting; Urolithiasis


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