Intelligent Optimization of the Film-to-Fiber Ratio of a Degradable Braided Bicomponent Ureteral Stent.
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ABSTRACT:
SUBMITTER: Liu X
PROVIDER: S-EPMC5458929 | biostudies-other | 2015 Nov
REPOSITORIES: biostudies-other
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Project description:IntroductionWe aimed to assess the effects of postoperative ureteral stent placement after uncomplicated ureteroscopy.MethodsWe performed a comprehensive search with no restrictions on publication language or status up to February 1, 2019. We only included randomized trials. Two review authors independently examined full-text reports, identified relevant studies, assessed the eligibility of studies for inclusion, extracted data, and assessed risk of bias. We performed statistical analyses using a random-effects model and assessed the certainty of the evidence according to GRADE.ResultsWe included 23 studies with 2656 randomized patients. Primary outcomes: It is uncertain whether stenting reduces the number of unplanned return visits (very low certainty of evidence [CoE]). Pain on the day of surgery is probably similar (mean difference [MD] 0.32; 95% confidence interval (CI) -0.13-0.78; moderate CoE). Pain on postoperative days 1-3 may show little to no difference (standardized mean difference [SMD] 0.25; 95% CI -0.32-0.82; low CoE). It is uncertain whether stented patients experience more pain on postoperative days 4-30 (very low CoE). Stenting may result in little to no difference in the need for secondary interventions (risk ratio [RR] 1.15; 95% CI 0.39-3.33; low CoE).Secondary outcomesWe are uncertain whether stenting reduces the need for narcotics and reduces ureteral stricture rates up to 90 days (very low CoE). Rates of hospital admission may be slightly reduced (RR 0.70; 95% CI 0.32-1.55; low CoE). This review was limited to patients in whom ureteroscopy was deemed 'uncomplicated.' In addition, time intervals for the grouping for the reported degree of pain were established post-hoc. The CoE for most outcomes was rated as low or very low for methodological reasons.ConclusionsFindings of this review illustrate the tradeoffs of risks and benefits faced by urologists and their patients when it comes to decision-making about stent placement after uncomplicated ureteroscopy for stone disease.
| S-EPMC7012284 | biostudies-literature
Project description:Despite routine implementation in urology, indwelling ureteral stents pose as a nidus for infection. Conditioning film accumulates on stents, which prime pathogen adhesion, promoting infectious biofilm formation. However, the extent to which conditioning film components play a role in facilitating bacterial adhesion and biofilm formation remains largely unknown. Here, we examined the interaction of previously identified stent-bound conditioning film components (fibrinogen, uromodulin, and albumin) with bacterial uropathogens. Cytoscopically removed stents were incubated with common uropathogens (Escherichia coli, Enterococcus faecalis, and Staphylococcus aureus). Immunofluorescent double staining was performed to study the localization of uropathogens relative to stent-bound conditioning film proteins. Conditioning film components were identified on the external stent surface with some deposition in the inner lumen. Bacteria co-localized with fibrinogen, uromodulin, and albumin, suggesting a potential mechanism for stent-associated infections. Here, we determine strong co-localization between common uropathogenic bacterial species with prominent conditioning film components on ureteral stents. Further functional validation of interactions amongst these uropathogens and conditioning film proteins may enhance clinical management for stent-associated infections and development of improved stent technologies.
| S-EPMC7558928 | biostudies-literature
Project description:A 67-year-old patient underwent robotic-assisted laparoscopic radical prostatectomy and experienced right ureteral lesion. The laceration was recognized intraoperatively and immediately repaired over the ureteral double J stent. The wire and the stent were first advanced distally to the bladder. Then the wire was pulled with its soft end, cranially through one of the side holes of the proximal end of the stent toward the kidney allowing exact positioning of the stent. Postoperative hospitalization was similar to a classic laparoscopic robotic-assisted prostatectomy. Robotic approach and the "side hole" technique represent an accurate and safe option in case of ureteral laceration management.
| S-EPMC5408132 | biostudies-literature
Project description:Objective:To compare the safety and efficacy between a covered metallic ureteral stent (CMS) and a double-J ureteral stent (DJS) for the treatment of a malignant ureteral obstruction (MUO). Materials and Methods:Nineteen patients (seven men and 12 women; mean age, 53.4 years) were randomly assigned to the CMS (n = 10) or DJS (n = 9) group. The following were compared between the two groups: technical success, i.e., successful stent placement into desired locations; stent malfunction; stent patency, i.e., no obstruction and no additional intervention; complications; and patient survival. Results:The technical success rate was 100% in all 10 and 12 ureteral units in the CMS and DJS groups, respectively. During the mean follow-up period of 253.9 days (range, 63-655 days), stent malfunction was observed in 40.0% (4/10) and 66.7% (8/12) in the CMS and DJS groups, respectively. In the per-ureteral analysis, the median patency time was 239.0 days and 80.0 days in the CMS and DJS groups, respectively. The CMS group yielded higher patency rates compared with the DJS group at three months (90% vs. 35%) and at six months (57% vs. 21%). The overall patency rates were significantly higher in the CMS group (p = 0.041). Complications included the migration of two metallic stents in one patient in the CMS group, which were removed in a retrograde manner. The two patient groups did not differ significantly regarding their overall survival rates (p = 0.286). Conclusion:Covered metallic ureteral stent may be effective for MUO.
| S-EPMC6005938 | biostudies-literature
Project description:BackgroundMost patients suffer from ureteral stent-related symptoms (USRS) caused by indwelling ureteral stents. Nevertheless, various medications to alleviate discomfort as well as novel stents are continually being developed, and in recent years, some researchers have believed that proper intravesical stent placement can relieve USRS.ObjectiveTo determine appropriate intravesical ureteral stent position may alleviate USRS.MethodsUp to May 1, 2022, the PubMed, Embase, Scopus and Web of Science databases were thoroughly searched, and two independent reviewers included relevant studies that met the PICO (Patient, Intervention, Comparison, Outcome) criteria. Studies methodological quality were assessed by ROB2 and ROBINS-I. Ureteral stent symptom questionnaire (USSQ), international prostate symptom score (IPSS) and quality of life (QoL) was used to quantify the USRS. According to intravesical ureteral stent position, Group A was defined as the contralateral group, that is distal end of ureteral stent crossed the bladder midline, whereas Group B was classified as ipsilateral group, meaning stent end did not cross the midline.ResultsSix studies incorporating a total of 590 patients were eligible. In terms of USSQ score, the meta-analysis showed that contralateral group was associated with a significant increase in USSQ total (MD, 17.55; 95% CI, 12.04 to 23.07; P < 0.001), urinary symptoms (MD, 2.74; 95% CI, 0.48 to 5.01; P = 0.02), general health (MD, 4.04; 95% CI, 2.66 to 5.42; P < 0.001), work performance (MD, 1.36; 95% CI, 0.75 to 1.98; P < 0.001) and additional problems (MD, 0.89; 95% CI, 0.47 to 1.32; P < 0.001) scores while not associated with a significant increase in body pain (MD, 3.13; 95% CI, -0.19 to 6.44; P = 0.06) and sexual matters (MD, 1.01; 95% CI, -0.03 to 2.06; P = 0.06). As for IPSS, although no significant differences in IPSS total (MD, 2.65; 95% CI, -0.24 to 5.54; P = 0.07) or voiding symptoms (MD, -0.84; 95% CI, -3.16 to 1.48; P = 0.48) scores were found, ipsilateral group was associated with a significant decrease in storage symptoms (MD, 1.92; 95% CI, 0.91 to 2.93; P = 0.0002). Furthermore, ipsilateral group was linked to a significant decrease in QoL score (MD, 1.00; 95% CI, 0.18 to 1.82; P = 0.02).ConclusionThis meta-analysis proven that correct intravesical stent position was critical, and patients with stents crossing the midline experienced more severe USRS than those who did not. Further high-quality randomized controlled trials are needed to corroborate our findings.
| S-EPMC9411969 | biostudies-literature
Project description:A 48-year-old man with a history of cerebral infarction presented with gross hematuria. The patient's limping accompanies twisting trunk on his walking. The diagnosis was right upper ureteral stone. Prior to Extracorporeal shockwave lithotripsy (ESWL) ureteral stent was inserted. After the second ESWL ureteral stent was displaced upwardly without patient's unknown. Retrograde intrarenal surgery (RIRS) was performed for both removal of ureteral stent and fragmentation of residual stone. Spontaneously, post RIRS ureteral stent was migrated upwardly to the same position. Ureteral stent migration is uncommon. Twisting walk may cause the position of ureteral stent upwardly.
| S-EPMC6562287 | biostudies-literature
Project description:Ureteral stents are commonly used to prevent urinary obstruction but can become colonized by bacteria and encrusted, leading to clinical complications. Despite recent discovery and characterization of the healthy urinary microbiota, stent-associated bacteria and their impact on encrustation are largely underexplored. We profile the microbiota of patients with typical short-term stents, as well as over 30 atypical cases (all with paired mid-stream urine) from 241 patients. Indwelling time, age, and various patient comorbidities correlate with alterations to the stent microbiota composition, whereas antibiotic exposure, urinary tract infection (UTI), and stent placement method do not. The stent microbiota most likely originates from adhesion of resident urinary microbes but subsequently diverges to a distinct, reproducible population, thereby negating the urine as a biomarker for stent encrustation or microbiota. Urological practice should reconsider standalone prophylactic antibiotics in favor of tailored therapies based on patient comorbidities in efforts to minimize bacterial burden, encrustation, and complications of ureteral stents.
| S-EPMC7659606 | biostudies-literature
Project description:Ureteral stent encrustation significantly limits indwelling time and can lead to downstream urological problems. However, no ideal polymeric biomaterials have been shown to completely resist encrustation in long-term urine exposure. Recently, 2-hydroxyethyl methacrylate (HEMA)-coated Pellethane was reported as a promising biomaterial resistant to encrustation. This study compared HEMA-coated Pellethane to commercially available stents under two different artificial urine environments. To evaluate the degree and composition of encrustation on HEMA-coated Pellethane, Boston Scientific Tria, Bard InLay Optima, Cook Universa Hydrogel, and Cook Black Silicone stents were used at various dwelling times in two different artificial urine environments. In a batch-flow model, samples of stents were suspended in an artificial urine solution (AUS) at 37 °C. Every 24 h for 11 weeks, 50% of the AUS would be replaced with fresh components using a programmable peristaltic pump system. The stent materials were removed at suitable time intervals and air-dried for 24 h under sterile conditions before follow-up analysis. SEM was used to assess the degree of encrustation, and inductively coupled plasma mass spectrometry (ICP-MS) was employed to quantify the encrusted compositions, specifically for calcium, magnesium, and phosphorus. We measured the weight gain over time due to encrusted deposits on the stents and quantified the amount of Ca, Mg, and P deposited on each encrusted stent. After the 11 week trial, HEMA-coated Pellethane showed the most average mass change. SEM showed that HEMA-coated Pellethane was fully encrusted in just 2 weeks in the AUS environments, and ICP-MS showed that Ca is the most abundant deposit. Among all the tested stents, Black Silicone performed the best. The two AUSs were formulated to encrust more rapidly than physiological conditions. HEMA-coated Pellethane is not an ideal stent material, while silicone is a promising material for advancing ureteral stents.
| S-EPMC10433332 | biostudies-literature
Project description:BackgroundCystoscopy evokes discomfort and pain, especially in males. The cystoscopic retrograde approach is standard in the removal of ureteral stents. However the satisfaction and degree of pain during the procedure according to the use of several pain controlling methods are unclear.MethodsThis is a cross-sectional survey of 60 patients who underwent cystoscopic ureteral stent removal under intravenous analgesics (group 1, n = 20), midazolam induction (group 2, n = 20), and propofol (group 3, n = 20). Procedural pain and post-procedure satisfaction were determined, and cost differences between the approaches were clarified.ResultsGroup 2 and 3 showed significantly less pain than group 1 (P < 0.001) and significantly higher satisfaction rate than group 1 (P < 0.001). Comparison of groups 2 and 3 revealed showed significantly less pain and higher satisfaction rate in group 3 (P < 0.001 for both). In Group 1, 17 (85.0%) patients wanted other treatment modalities, compared to eight group 2 patients (40.0%) and no group 3 patients.ConclusionsConsidering the potential pain and dissatisfaction of rigid cystoscopic ureteral stent removal, procedures utilizing moderate sedation with midazolam or general anesthesia using propofol without muscle relaxation should be considered.Trial registrationKCT0001260.
| S-EPMC4242475 | biostudies-literature
Project description:ObjectiveTo bridge the gap between evidence and clinical judgement, we defined scenarios appropriate for ureteral stent omission after uncomplicated ureteroscopy (URS) using the RAND/UCLA Appropriateness Method (RAM). We retrospectively assessed rates of appropriate stent omission, with the goal to implement these criteria in clinical practice.MethodsA panel of 15 urologists from the Michigan Urological Surgery Improvement Collaborative (MUSIC) met to define uncomplicated URS and the variables that influence stent omission decision-making. Over two rounds, they scored clinical scenarios for Appropriateness Criteria (AC) for stent omission based on a combination of variables. AC were defined by median scores: 1 to 3 (inappropriate), 4 to 6 (uncertain), and 7 to 9 (appropriate). Multivariable analysis determined the association of each variable with AC scores. Uncomplicated URS cases in the MUSIC registry were assigned AC scores and stenting rates assessed.ResultsSeven variables affecting stent decision-making were identified. Of the 144 scenarios, 26 (18%) were appropriate, 88 (61%) inappropriate, and 30 (21%) uncertain for stent omission. Most scenarios appropriate for omission were pre-stented (81%). Scenarios with ureteral access sheath or stones >10mm were only appropriate if pre-stented. Stenting rates of 5,181 URS cases correlated with AC scores. Stents were placed in 61% of cases appropriate for omission (practice range, 25% to 98%).ConclusionWe defined objective variables and AC for stent omission following uncomplicated URS. AC scores correlated with stenting rates but there was substantial practice variation. Our findings demonstrate that the appropriate use of stent omission is underutilized.
| S-EPMC9432824 | biostudies-literature