Inserting a Metallic Ureteral Stent Using an Antegrade Approach Freed a Patient from Nephrostomy Created due to Hydronephrosis Caused by Bladder Cancer

Kawahara, Takashi; Takamoto, Daiji; Miyoshi, Yasuhide; Yao, Masahiro; Uemura, Hiroji

doi:10.1159/000501767

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…When a stent cannot be placed in the ureter, or long-term stenting is required, an extra-anatomic stent (EAS) can bypass the ureteral obstruction. A stent is placed through the skin in the kidney and tunnels under the skin into the bladder and creates extraanatomical urine drainage (9). We describe the most recent developments in observable risk factors that can be used to predict the failure of urinary drainage.…”

Section: Stents For Malignant Ureteral Obstructionmentioning

confidence: 99%

Modes of drainage of kidneys with bilateral malignant obstruction

2023

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Malignant ureteral obstruction (MUO) is an unpleasant finding resulting from a wide range of malignancies with limited survival prognosis. Its presentation and progression show that it can resist treatment with some stents, including single polymer ureteral stents. With most treatment failures, several treatments are available for the initial management and treatment of benign ureteral obstruction, including therapy with percutaneous nephrostomy (PCN), metallic stents, tandem stents, and other stents. Considering the variety of methods and the heterogeneous population of patients, evaluating the merit of each approach is challenging and needed. Due to the lack of significant studies in this field, these methods leave their performance up to the individual provider. This review aims to provide a framework for urologists to use for individual care and apply it appropriately to patients with MUO. Prospective clinical studies are needed to empower patients with MUO to receive evidence-based treatment and recommendations.

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Section: Stents For Malignant Ureteral Obstructionmentioning

confidence: 99%

Modes of drainage of kidneys with bilateral malignant obstruction

2023

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“…Ureteral stents are minimally invasive surgical instruments that are commonly used in clinics 1,2 ; they can prevent ureteral obstruction and drain urine after being implanted into the urinary system of the patient. Three kinds of material are used to prepare ureteral stents: metal materials, 3–5 non‐degradable polymer materials, 6–8 and biodegradable polymer materials 9–11 . Metal stents have been widely used in recent years, with nickel titanium alloys and stainless steels often used as medical metal materials.…”

Section: Introductionmentioning

confidence: 99%

Preparing and characterizing biodegradable materials for ureteral stents

Cui

Zhang

Gao³

et al. 2021

Polymers for Advanced Techs

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The development and application of biodegradable ureteral stents is of clinical significance for patients with ureteral stenosis and obstruction. We prepared five types of degradable monofilament, namely poly‐L‐lactide, poly(L‐lactide‐co‐ glycolide) (85% L‐lactide, 15% glycolide), poly(L‐lactide‐co‐glycolide‐co‐ε‐ caprolactone) (89% L‐lactide, 8% glycolide, and 3% ε‐caprolactone), poly(L‐lactide‐ co‐D,L‐lactide) (95% L‐lactide, 5% D,L‐lactide), and poly(lactide‐co‐ε‐caprolactone) (95% L‐lactide, 5% ε‐caprolactone), by melt extrusion and secondary drawing processes, after which degradation experiments were carried out in simulated urine at 37°C for 2 months. Because residues in the urinary systems of patients can cause complications, it is important that biodegradable ureteral stents are completely degraded after 6 weeks. Poly‐L‐lactide did not completely degrade under the abovementioned conditions and its molecular weight changed little. On the other hand, the poly(L‐lactide‐co‐glycolide) monofilament degraded slightly faster than that prepared from poly‐L‐lactide; however it maintained a certain mechanical strength after 8 weeks, which is not ideal for a woven ureteral stent. The poly(L‐lactide‐co‐D,L‐lactide), poly(L‐lactide‐co‐glycolide‐co‐ε‐caprolactone), and poly(lactide‐co‐ε‐caprolactone) monofilaments exhibited good tensile strengths and elongations at break in the first four weeks, which were reduced to almost zero in the eighth week. Ureteral stents made of these polymers can open narrow urethras at early stages and degrade completely at later stages. Based on its degradation rate, we conclude that the poly(lactide‐co‐ε‐caprolactone) monofilament is the best material for the preparation of ureteral stents.

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“…We previously reported the usefulness of ureteral stenting in the treatment of malignant ureteral obstruction (MUO) and that hematological disease was responsible for 2.6% of all cases of MUO [ 2 , 3 ]. In malignant myeloma, steroid treatment is sometimes introduced with systemic chemotherapy.…”

Section: Introductionmentioning

confidence: 99%

Bilateral Encrusted Metallic Stent Successfully Removed by Ureteroscopic Lithotripsy Using a Ho:YAG Laser in a Patient with Malignant Myeloma

et al. 2020

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Ureteral stent encrustation is sometimes encountered, especially in cases in which a ureteral stent has been forgotten. An 84-year-old female patient with malignant myeloma underwent metallic ureteral stent insertion to treat malignant ureteral obstruction. At the time of scheduled ureteral stent exchange, the stent was heavily encrusted and could not be removed on either side. We performed endoscopic lithotripsy to remove the encrusted ureteral stents. The bilaterally encrusted metallic ureteral stents were successfully removed using Ho:YAG laser lithotripsy after inserting another ureteral stent placement besides the encrusted metallic ureteral stents.

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Inserting a Metallic Ureteral Stent Using an Antegrade Approach Freed a Patient from Nephrostomy Created due to Hydronephrosis Caused by Bladder Cancer

Cited by 4 publications

References 5 publications

Modes of drainage of kidneys with bilateral malignant obstruction

Modes of drainage of kidneys with bilateral malignant obstruction

Preparing and characterizing biodegradable materials for ureteral stents

Bilateral Encrusted Metallic Stent Successfully Removed by Ureteroscopic Lithotripsy Using a Ho:YAG Laser in a Patient with Malignant Myeloma

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