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Concept: Ureteric stent

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Abstract Background: For the narrow ureter that will not accommodate a ureteroscope, it is common practice to place a ureteral stent, to allow subsequent ureteroscopy in the passively dilated ureter. Surprisingly, there are limited data on the effectiveness or safety of these maneuvers. Methods: We retrospectively analyzed patients managed with ureteral stent placement followed by another attempt at ureteroscopy after an initial attempt of flexible ureteroscopy failed because the ureteroscope would not pass up an otherwise normal ureter. Results: Of 41 patients with follow-up who underwent ureteral stenting for this reason, the ureteroscope passed with ease poststenting in 29 (71%) and there was continued resistance in 12. Of these 12 patients, the ureteroscopy was continued despite resistance in 9, while another stent was placed in the remaining 3. Of these three patients, the third attempt at ureteroscopy was successful in two, and further attempts at ureteroscopy were not made after the third attempt failed in one. With a mean overall follow-up of 32 months, two patients (5%) developed ureteral strictures. Both were among nine patients in whom repeat ureteroscopy was performed despite resistance, with a rate of obstruction of 22% in this subgroup. Overall, ureteral stenting allowed successful ureteroscopy in 98% of patients. Conclusions: Ureteral stenting with subsequent ureteroscopy is a successful and safe method of addressing a narrow ureter that initially does not allow passage of a flexible ureteroscope, as long as persistent subsequent attempts to insert the ureteroscope are made only if it passes easily.

Concepts: Stent, Restenosis, Renal pelvis, Coronary stent, Ureteric stent, PASS

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The use of ureteral stents has become a routine urological practice. There are many different complications with ureteral stent use. One rare complication is knotting, which can be a very difficult condition to treat. We report a case in which a complete knot was found in the proximal part of an indwelling ureteral stent with a proximal ureteral stone.

Concepts: Urology, Knot, Stent, Implants, Ureteric stent

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BACKGROUND: Placement of ureteral stents at the time of renal transplantation is thought to decrease the incidence of postoperative complications, such as anastomotic leakage and stenosis. However, stents may also predispose to post-transplantation urinary tract infection, which can lead to increased risks of graft dysfunction, sepsis, and death. The aim of this study was to analyze the risk of post-transplantation bacteriuria with ureteral stent placement in renal allograft recipients. METHODS: A retrospective single-center analysis was conducted to investigate the incidence of bacteriuria in all renal allograft recipients transplanted between January 2007 and March 2009. Recipients were categorized as in the nonstent group (NSTG) or the stent group (STG). Stent removal was performed per protocol at 6 weeks, and all patients were followed for at least 1 year post transplantation. In the NSTG, the incidence of bacteriuria was assessed at 0-6, 6-12, and 12 weeks to 1 year post transplantation. In the STG, bacteriuria was assessed prior to stent removal, 6 weeks after stent removal, and thereafter until 1 year post transplantation. RESULTS: A total of 395 renal allograft recipients, 183 in the NSTG and 212 in the STG groups, were studied. The overall incidence of bacteriuria within 1 year post transplantation was similar between NSTG and STG (28.0 vs. 24.0%, P = 0.38). No difference was found in the incidence of bacteriuria when NSTG and STG were compared at 0-6 weeks or prior to stent removal (9.7% vs. 9.1%, P = 0.81), at 6-12 weeks, or 6 weeks after stent removal (6.7% vs. 5.8%, P = 0.75), and thereafter for 1 year post transplantation (13.3% vs. 10.8%, P = 0.46). The incidence of graft failure at 1 year was similar in NSTG and STG (6.2% vs. 4.9%, P = 0.6). Urinary anastomotic leakage occurred in none of the NSTG and 2 of the STG recipients. On multivariate analysis, risk factors for bacteriuria were female recipient gender (odds ratio [OR] 2.5, 95% confidence interval [CI] 1.5-4.3, P = 0.001), delayed graft function (DGF) (OR 2.1, 95% CI 1.2-3.8, P = 0.01), and postoperative Foley catheterization for >5 days (OR 4.7, 95% CI 1.3-17.6, P = 0.02). CONCLUSION: Independent risk factors for bacteriuria following kidney transplantation include DGF, prolonged postoperative Foley catheterization, and recipient female gender, but not placement of ureteral stents.

Concepts: Kidney, Urinary tract infection, Urine, Urinary bladder, Urinary system, Ureter, Organ transplant, Ureteric stent

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The comparative effectiveness of ureteral stents placed during ureteroscopy for urinary stone disease is widely debated. We sought to evaluate unplanned medical visits within the early post-operative period after ureteroscopy in patients with and without ureteral stent placement.

Concepts: Hospital, Cardiology, Urology, Physician, Kidney stone, Coronary stent, Ureteric stent

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To investigate the morbidity, complication rate, and pain perception during removal of a novel ureteric stent with a magnetic end using a-traumatic retrieval catheter.

Concepts: Stent, Implants, Pain, Ureteric stent, Pain asymbolia

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To affirm technical success, clinical success and safety of fluoroscopically guided transurethral replacement of double-J (DJ) ureteral stents.

Concepts: Stent, Implants, Restenosis, Ureteric stent

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To assess the outcomes of ureteral stent placement under local anesthesia for the management of multiple ureteral disorders.

Concepts: Anesthesia, Local anesthesia, Local anesthetic, Ureteric stent

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To evaluate urination-related quality of life (QoL) in patients with an indwelling ureteral stent immediately after ureteroscopic lithotripsy (URSL) for upper urinary calculi. We compared the effects of loop-tail and pigtail ureteral stents on urination-related QoL.

Concepts: Kidney stone, Ureteric stent

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The goal of this study was to determine the efficacy and safety of tandem ureteral stent placement in the management of malignant ureteral obstruction (MUO) refractory to single ureteral double-J stent drainage in women with gynecological malignancies.

Concepts: Cancer, Stent, Implants, Woman, Project management, Coronary stent, Ureteric stent

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Nephrostomy tube insertion and/or a ureteral stent placement is advised when pelvi-calyceal perforations are encountered during percutaneous nephrolithotomy (PNL) nevertheless totally tubeless PNL is a possible exit strategy in percutaneous renal surgery therefore case series on the short term clinical outcomes of noninvasive management of iatrogenic pelvicalyceal perforations encountered during PNL is presented.

Concepts: Medicine, Evaluation methods, Term, Ureteric stent