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Ureteral Stenting After Retrograde Intrarenal Surgery for Renal Stones

Sponsor: Al-Azhar University • ClinicalTrials.gov ID: NCT05738304

Registry updated: 2026-08-24

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Description

Several studies evaluated the benefit of a short-term external ureteral catheter (UC) compared to double-J (DJ) ureteral stent after flexible ureteroscopy (URS); the results were controversial. These studies had combined analyses of ureteral and renal stones with a high risk of selection bias. Studies comparing external UC and DJ stent after flexible URS for isolated renal stones are lacking. In the present study, the investigators will compare the outcomes of using a one-day external UC versus a DJ internal ureteral stent for ureteral drainage after retrograde flexible URS (retrograde intrarenal surgery "RIRS") for renal stones. The investigators aim to identify the best ureteral drainage method after RIRS regarding stone clearance, complications, and stent-related symptoms.

Interventions

Retrograde intrarenal surgery with external ureteral catheter (Procedure)
The retrograde fURS sheathless technique will be used in all cases, including (a) cystourethroscopy with the introduction of a guidewire into the ipsilateral ureter up to the collecting system; (b) Semi-rigid ureteroscopy (using 9.5 Fr, Karl Storz, semi-rigid ureteroscope) for visualization of the ureter for any abnormalities, the introduction of the second guidewire and hydrophilic ureteral dilation; (c) introduction of the flexible ureteroscope (8.6 Fr, single-use digital flexible ureteroscope, OUT Medical Inc.) over the guidewire up to the kidney; (d) removal of the working guidewire after visualization of the stone; and (e) fragmentation of the stone using a holmium YAG laser device. All procedure steps will be performed under direct visualization and fluoroscopy guidance. At the end of the procedure, an external ureteral catheter will be placed for 24 hours.
Retrograde intrarenal surgery with double J internal ureteral stent (Procedure)
The retrograde fURS sheathless technique will be used in all cases, including (a) cystourethroscopy with the introduction of a guidewire into the ipsilateral ureter up to the collecting system; (b) Semi-rigid ureteroscopy (using 9.5 Fr, Karl Storz, semi-rigid ureteroscope) for visualization of the ureter for any abnormalities, the introduction of the second guidewire and hydrophilic ureteral dilation; (c) introduction of the flexible ureteroscope (8.6 Fr, single-use digital flexible ureteroscope, OUT Medical Inc.) over the guidewire up to the kidney; (d) removal of the working guidewire after visualization of the stone; and (e) fragmentation of the stone using a holmium YAG laser device. All procedure steps will be performed under direct visualization and fluoroscopy guidance. At the end of the procedure, a double-J internal ureteric stent will be placed for 2 weeks.

Eligibility criteria

Inclusion Criteria: • Adult patients of either gender in whom RIRS was the primary modality. Exclusion Criteria: * Pregnant women * Active urinary tract infection * solitary kidney * Concomitant pathology that need intervention in the same setting * Patients with surgical incidents that indicate double-J stenting (Residual sizable fragments, ureteral false passage, ureteral mucosal laceration, ureteral perforation, and calyceal rupture).

Conditions

Kidney Stone Retrograde Intrarenal Surgery Ureteral Stent

Locations

Urology Department, Al-Azhar University Hospital — Cairo, Egypt

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Official Source

Data sourced from ClinicalTrials.gov, a service of the U.S. National Institutes of Health.

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