Observational studyUrolithiasis2026
Extraction-string ureteral stents and postoperative infection after flexible ureteroscopy: an IPTW-adjusted analysis.
Observational study in Urolithiasis, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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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.
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Authors and funding
6 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Extraction-string ureteral stents facilitate non-cystoscopic removal after ureteroscopy, but concerns remain regarding postoperative infection and accidental dislodgement. We evaluated whether extraction-string stents were associated with postoperative infection after flexible ureteroscopic lithotripsy (fURSL) in a cohort restricted to procedures with the distal Double-J (D-J) stent portion positioned within the bladder. This retrospective observational study included 102 procedures in 92 unique patients: 58 extraction-string and 44 conventional non-string procedures. Postoperative infection was defined as fever > 38 °C or a positive postoperative urine culture during the stent-indwelling period. Propensity scores incorporated age, sex, positive preoperative urine culture, preoperative pyuria, and procedure laterality. Stabilized inverse probability of treatment weights were truncated at the 1st and 99th percentiles; effective sample size was 85.38. Crude postoperative infection occurred in 8/58 (13.8%) extraction-string and 6/44 (13.6%) non-string procedures. After weighting, estimated infection rates were 13.6% and 8.8%, respectively (OR 1.64, 95% CI 0.50-5.44; P = 0.416). Fever, positive postoperative urine culture, postoperative pyuria, and postoperative day 1 pain did not differ significantly. Sensitivity analyses accounting for repeated procedures and propensity-model specification were consistent with the primary analysis. Extraction-string stent use was not significantly associated with postoperative infection after fURSL; however, the limited number of events and wide confidence intervals preclude exclusion of a clinically meaningful difference.
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