Trial reportBMC urology2026
Two versus four weeks ureteral stenting prior to flexible ureteroscopy after failed primary ureteral access sheath insertion: a randomized trial.
Trial report in BMC urology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT06761378 (Ideal Time of Stenting Prior to Ureteral Access Sheath for Stone Disease , Two vs Four Weeks Prospective Study), which is not on this map. Not yet cited in PubMed.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
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Ideal Time of Stenting Prior to Ureteral Access Sheath for Stone Disease , Two vs Four Weeks Prospective Study
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5 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundDuring Flexible ureteroscopy; Failed primary placement of the ureteral access sheath (UAS) or backloading of flexible ureteroscopy occurred in up to 22% of patients who required ureteric stent insertion for some time. This study was conducted to compare the outcomes of two versus four weeks of preoperative ureteral stenting in patients with failed primary ureteral access undergoing flexible ureteroscopy (FURS). PATIENTS AND
methodsThis single-blind, randomized controlled trial included 60 patients with upper and/or renal stones < 20 mm who had failed primary access during FURS between April 2024 and October 2025. Patients were randomized into 2 groups to insert a ureteral double-J stent for either 2 weeks (n = 30) or 4 weeks (n = 30) before the definite FURS. The primary endpoint was successful insertion of a 10/12 Fr ureteral access sheath (UAS). Secondary outcomes included stone-free rate (SFR) (assessed by a postoperative 4-week CTUT), operative time, complications, and stent-related symptoms (assessed by the Ureteral Stent Symptom Questionnaire (USSQ)).
resultsBaseline demographic and clinical characteristics were comparable between groups. Successful UAS insertion was achieved in 90% of the 2-week group and 93.3% of the 4-week group with no difference between groups (p = 0.64). No significant differences were found between groups regarding postoperative 4-week NCCT SFR (80.0% vs. 73.3%, p = 0.54), operative time (55 vs. 48.5 min, p = 0.44), or complication rates. Ureteric injuries were minor (6.7% in each group). Stent-related symptoms measured by USSQ did not significantly differ (p = 0.24).
conclusionIn this randomized trial, no statistically significant differences were observed between 2-week and 4-week preoperative stenting regarding UAS insertion success, stone-free rate, operative time, or complication rates. These findings suggest that prolonging stent dwell time beyond 2 weeks may not provide a substantial additional benefit in this patient population.
trial registrationThe trial was retrospectively registered in 12/2024 on clinicaltrials.gov under the number: NCT06761378.
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