Ureteral stent after PCNL: is leaving the threads through the percutaneous tract safe and better tolerated?

OBJECTIVE: To assess safety, urinary symptoms, and feasibility of JJ stent removal with exteriorized threads through the percutaneous tract after percutaneous nephrolithotomy (PCNL). MATERIALS AND METHODS: Prospective, transversal, comparative, experimental, randomized 1-to-1 cohort study in 52 patients who underwent "tubeless" PCNL from October 2020 to November 2022. Group A with threads through the urethra and Group B through the percutaneous tract. The validated USSQ (Ureteral Stent Symptom Questionnaire) was applied in the Urology office a week after the procedure, and the JJ stent was withdrawn by pulling the threads. Hemoglobin and urine culture, and pre- and post-surgery were evaluated. RESULTS: There is a statistically significant difference in favor of group B when comparing urinary symptoms (p = 0.008), body pain (p = 0.009), and general condition (p = 0.042), mainly for non-urgency incontinence, frequency of analgesic use, and dysuria. There were significant differences between groups (p = 0.028, p = 0.026, p = 0.027, respectively). There is no association with urinary infections (p = 0.603) nor an increased risk of bleeding (p = 0.321). CONCLUSION: The removal of the JJ stent with exteriorized threads through the percutaneous tract after PCNL in the office is a feasible and safe procedure if it is removed before 8 days and has better tolerance regarding the urinary symptoms.

Antireflux Ureteral Stents Prevent Stent-Related Symptoms: A Meta-Analysis of Randomized Controlled Trials.

Ureteral stents are widely used in urological care, but they are often associated with adverse stent-related symptoms (SRS), such as painful urination, elevated urinary frequency, and abdominal discomfort. Antireflux ureteral stents have been developed to reduce stent-related pain and reflux by minimizing vesicoureteral reflux (VUR). This systematic review and meta-analysis of randomized controlled trials (RCTs) was undertaken to assess the efficacy of antireflux ureteral stents in mitigating SRS compared to conventional urethral stents. Our study included a total of 269 cases from three RCTs. The meta-analysis showed that antireflux ureteral stents were significantly more effective than standard stents in reducing SRS, including stent-related pain (odds ratio (OR): 4.80, 95% CI: 2.77, 8.31, p <0.00001), severe stent-related pain (OR: 8.35, 95% CI: 2.12, 32.89, p=0.002), flank pain while urinating (OR: 5.98, 95% CI: 3.35, 10.68, p <0.00001), and severe flank pain while urinating (OR: 15.79, 95% CI: 2.91, 85.57, p=0.001). There was no significant difference in the rates of postoperative creatinine abnormality or postoperative hydronephrosis between the two groups. Therefore, antireflux ureteral stents are more effective than standard stents in reducing SRS. This suggests that antireflux ureteral stents should be considered for patients undergoing ureteral stenting.

Epidemiology and risk factors for febrile ureteral stent-associated urinary tract infections: A prospective observational cohort study.

OBJECTIVES: We aimed to determine the incidence and risk factors of febrile ureteral stent-associated urinary tract infections (FUSAUTI). METHODS: Hospitalized adult patients with ureteral stent (US) placement or exchange were prospectively enrolled. Patients with kidney transplantation of less than one year were excluded. Patients were followed until US removal/exchange or six months after inclusion. RESULTS: Out of 663 patients included in the study, 48 had at least one FUSAUTI (cumulative incidence 7.24%; 95% confidence interval [CI] 5.39-9.48). The incidence rate of FUSAUTI was 9.04 (95% CI 6.67-12.2) per 10,000 US-days. Ten patients (20.8%) experienced sepsis or septic shock. The most frequently isolated microorganisms were Escherichia coli (38%), Enterococcus spp. (14.5%), Candida spp. (9%) and Pseudomonas aeruginosa (9%). In multivariable logistic regression analysis, female gender, an age adjusted Charlson comorbidity index score> 3, an urethral stent placement concomitant with US placement, and a history of urinary tract infection within three months were significantly associated with a higher risk of FUSAUTI. CONCLUSION: After US placement, 7.24% of patients developed at least one FUSAUTI and, in a quarter of cases, a serious infection. Urethral stent placement was the only modifiable risk factor identified. Future interventional studies are needed to reduce FUSAUTI in these patients.

Metastatic renal cell carcinoma in the bladder following complex partial nephrectomy: A case report.

Metastasis of renal cell carcinoma (RCC) to the bladder is rare. We present a case of a 74-year-old patient with a metachronous, solitary metastasis of RCC to the bladder twenty months after partial nephrectomy and JJ-stent placement for a complex renal tumor. The mechanism of RCC metastasis to the bladder remains controversial, and we believe this case adds support to the drop metastasis theory.

Olbert's Balloon Dilatation as a Minimally Invasive Possibility of Treating Ureteral Stricture After Complicated URS-L in Children.

Olbert's balloon dilatation is a surgical technique used for the treatment of ureteral stricture. Although it is more frequently used in adults, due to the advancing miniaturization of the equipment, this technique has become possible in children. We would like to present five cases of Olbert's balloon dilatation carried out in children with ureteral stricture, aged 12-17 years. All of these children were diagnosed for at least 6 months. Ureteral stricture has been noticed in those patients with a time of a stone residence in the ureter longer than 6 months. The duration of the stone in the ureter varied from 6 to 18 months. The symptoms were abdominal pain, renal colic pain, UTI, fever, vomiting, and nausea. Ultrasound (US) revealed hydronephrosis and ureter dilatation above the stone. All of these children had grade-3 hydronephrosis based on the Onen grading system during admission to the hospital. The lack of renal function on the DMSA scan was observed with an average of 22%. JJ-stent was inserted as a first-line treatment. A retrograde pyelogram revealed ureteral stricture at a length from 1 to 1.7 cm in the place where the stone was ingrown. Olbert's balloon dilatation under fluoroscopy was performed successfully in all children. We achieved an efficacy of 60% in our series. Renal function increased to an average of 36% on DMSA 3 months after surgery. The level of creatinine is shaped at an average of 0.6. On US, two children had no hydronephrosis while one child had grade-1 hydronephrosis. The longest follow-up is now 4 years, with the same good results. In conclusion, Olbert's balloon dilatation is an effective, safe, and minimally invasive tool for ureteral stricture in the hands of the endourological experienced pediatric urologist. But more prospective, randomized trials are still needed.

Postoperative JJ stent is not necessary after balloon high-pressure endoscopic dilatation of primary obstructive megaureter.

INTRODUCTION: A wide range of surgical interventions have been described for the management of primary obstructive megaureter (POM). Endoscopic balloon dilatation has been developed through last decades as a minimally invasive alternative to classic surgery. OBJECTIVE: To assess the need for placement of a double J stent after endoscopic balloon dilatation procedure, by comparing the post-operative related outcomes with and without double J placement. Secondary outcome was the success rate, considering the need for further procedure after endoscopic balloon dilatation and the improvement of the ureteral diameter in the two groups. STUDY DESIGN: Historical retrospective comparison of children treated by endoscopic dilatation for POM, with post-operative JJ stent left in place (2012-2014) or without ureteral JJ stent (since 2015). Post-operative complications were reported following Clavien-Dindo grading system and compared between the two groups. Success rate was defined as absence of need for further surgical reimplantation. Ureteral diameters on preoperative and postoperative renal ultrasounds were compared. RESULTS: Endoscopic dilatations were performed in 42 patients for 46 renal units during the study period. There was a significantly higher rate of post-operative complications in the group with JJ stenting compared to the group without double J stenting regarding all Clavien-Dindo grades (56% vs 15%, p = 0.014) and Clavien-Dindo grade III only (31% vs 0%, p = 0,0051) (Figure). The success rate was similar in the JJ group (75%, F-up: 70 months [13-101]) and the no JJ group (81%, F-up: 26 months [12-95]). There was a significant improvement of US renal pelvis and ureter dilatation in both groups, with a median follow-up of 35.5 months [12-101]. DISCUSSION: The overall rate of complications was slightly higher than in other reports and higher in the JJ group regarding Clavien-Dindo grade III complications. The success rate was comparable to previous studies reviewing endoscopic dilatations and equivalent in the two groups. CONCLUSION: In our study, the omission of postoperative ureteral drainage by a JJ stent after endoscopic balloon dilatation of POM did not increase post-operative complications rate without demonstrable impact on the success rate.

Is JJ Ureteral Stenting Inferior to Percutaneous Nephrostomy as a Drainage Method in Emphysematous Pyelonephritis?

INTRODUCTION: The aim of the study was to examine the efficacy of JJ stenting in comparison with percutaneous nephrostomy (PCN) as a drainage method in patients with emphysematous pyelonephritis (EPN). METHODS: We retrospectively identified patients with EPN between January 2000 and January 2021. Platelet-to-leukocytic ratio (PLR) at the time of hospital admission and discharge, time taken to clear air locules and to normalize leukocytic count, and air locule volume in mm3 were identified. Renal drainage by either PCN or JJ stent was required if symptoms persist for ≥3 days or in obstructed renal units. Failure of drainage method was defined as conversion to another method of drainage, need for intensive care unit admission, salvage nephrectomy, and mortality. RESULTS: Twenty-nine patients were managed by JJ stent. Treatment success was identified in 20 patients and 19 patients who were managed by PCN and JJ stent, respectively. Higher air locule volume ≥16.7 mm3 and lower PLR ≤18.4 increased the risk of drainage failure (p = 0.009 and 0.001, respectively). CONCLUSION: Ureteral JJ stenting is an effective method for EPN drainage with a comparable overall success to the PCN use. Higher air locule volume and lower PLR increased the risk of drainage failure.

Can mini PCNL achieve the same results as RIRS? The initial single center experience.

BACKGROUND: Urolithiasis is a prevalent disease worldwide with high recurrence rate, minimally invasive interventions have largely replaced open ones, namely PCNL and RIRS. Miniaturization, optical improvements, and modern laser types made these procedures safe and effective in the management of single renal stones.Aim of the study: Is to compare the effectiveness of mini PCNL with RIRS in the treatment of single renal stone of ≤25 mm. PATIENTS AND METHODS: This prospective study that included 60 patients with single renal stones of ≤25 mm and were treated by either mini PCNL (group A) or RIRS (group B). The study was performed during the period from October 2020 to April 2021. RESULTS: The mean operative time RIRS group was 43.6 ± 10.493, while for miniPCNL it was 36.6 ± 7.035 (P = 0.004). The stone free rate in RIRS and miniPCNL group was 70% and 90% respectively (P = 0.053). The need for JJ stent was higher in RIRS compared to miniPCNL group (70% vs. 40%) respectively (P = 0.02). The duration of hospital stay in miniPCNL was 38.2 h compared to 16.7 h for RIRS group (p = 0.0001). The rate of postoperative hemoglobin drop was higher in MiniPCNL compared to RIRS (P = 0.0001). There was no significant difference regarding complication rates between both groups. CONCLUSION: Mini-PCNL FOR the treatment of renal stones sized ≤25 mm has high stone free rate, shorter operative time, less requirement for JJ stent and near similar post-operative pain and complications compared to RIRS.

[Preoperative double J stent placement in the endoscopic treatment of ureteral and renal Stone: A multicenter, national study.] / Colocación preoperatoria de catéter doble J en el tratamiento endoscópico de la litiasis ureteral y renal: estudio multicéntrico, nacional.

OBJECTIVE: Aim of our study was to evaluate the effectiveness and safety of the preoperative placement of JJ stent compared to not doing in patients undergoing ureteroscopy for ureteral and kidney stone. MATERIALS AND METHODS: Prospective, observational, multicenter study. Adult patients, who underwent ureteroscopy treatment for ureteral and kidney stone, were recruited from August 2017 to March 2019, in 23 Argentine institutions. The variables analyzed included: demographic data, stone size and location, stone-free rate (SFR) and complications. RESULTS: 580 patients were included. 473 with ureteral stone (309 with and 164 without prior JJ stent) and 107 with kidney stone (77 with and 30 without prior JJ stent). The SFR was higher in the group with previous JJ stent, both in the treatment of ureteral stone (82.2% vs. 90.9%, OR 2.15 (1.17 to 3.96)), and in the treatment of kidney stone (73.3% vs. 89.6%, OR 3.14 (1.02 to 9.61)). No differences were established in the complication rate both in the treatment of ureteral stone (6.1 vs. 6.1%, OR 0.98 (0.45 to 2.19)) and in the treatment of kidney stone (6.7 vs. 5.2%, OR 0.76 (0.13 a 4.46)). CONCLUSIONS: The preoperative placement of JJ stent, increases SFR in the treatment of ureteral and kidney stone, but not decrease the complication rate.

OBJETIVO: El objetivo fue evaluar la efectividad y seguridad de la colocación preoperatoria del catéter doble J comparado con no hacerlo, en pacientes sometidos a ureteroscopía por litiasis ureteral y renal.MATERIALES Y MÉTODOS: Estudio prospectivo, observacional, multicéntrico. Se reclutaron pacientes adultos, que se sometieron al tratamiento ureteroscópico para litiasis ureteral y renal, desde agosto de 2017 a marzo de 2019, en 23 instituciones Argentinas. Las variables analizadas incluyeron: datos demográficos, tamaño y ubicación de la litiasis, tasa libre de litiasis (LL) al finalizar el procedimiento y de complicaciones en el posoperatorio inmediato. RESULTADOS: Se incluyeron 580 pacientes. 473 con litiasis ureteral (309 con y 164 sin doble J previo) y 107 con litiasis renal (77 con y 30 sin doble J previo). La tasa LL fue mayor en el grupo con doble J previo, tanto en el tratamiento de la litiasis ureteral (82,2% vs. 90,9%, OR 2,15 (1,17 a 3,96)), como en el tratamiento de la litiasis renal (73,3% vs. 89,6%, OR 3,14 (1,02 a 9,61)). No se establecieron diferencias en la tasa de complicaciones tanto en el tratamiento de la litiasis ureteral (6,1 vs 6,1%, OR 0,98 (0,45 a 2,19)) como en el tratamiento de la litiasis renal (6,7 vs 5,2%, OR 0,76 (0,13 a 4,46)). CONCLUSIONES: La colocación preoperatoria del catéter doble J mejoró la tasa LL en el tratamiento de la litiasis ureteral y renal, pero no disminuyó la tasa de complicaciones.

Colocación preoperatoria de catéter doble j en el tratamiento endoscópico de la litiasis ureteral y renal: estudio multicéntrico, nacional / Preoperative placement of a double J stent in the endoscopic treatment of ureteral and renal lithiasis: a multicenter, national study

Objetivo: El objetivo fue evaluar la efectividad y seguridad de la colocación preoperatoria delcatéter doble J comparado con no hacerlo, en pacientes sometidos a ureteroscopía por litiasis ureteral y renal.Materiales y métodos: Estudio prospectivo, observacional, multicéntrico. Se reclutaron pacientes adultos,que se sometieron al tratamiento ureteroscópico paralitiasis ureteral y renal, desde agosto de 2017 a marzode 2019, en 23 instituciones Argentinas. Las variables analizadas incluyeron: datos demográficos, tamaño yubicación de la litiasis, tasa libre de litiasis (LL) al finalizar el procedimiento y de complicaciones en el posoperatorio inmediato.Resultados: Se incluyeron 580 pacientes. 473 conlitiasis ureteral (309 con y 164 sin doble J previo) y107 con litiasis renal (77 con y 30 sin doble J previo).La tasa LL fue mayor en el grupo con doble J previo,tanto en el tratamiento de la litiasis ureteral (82,2% vs.90,9%, OR 2,15 (1,17 a 3,96)), como en el tratamiento de la litiasis renal (73,3% vs. 89,6%, OR 3,14 (1,02a 9,61)). No se establecieron diferencias en la tasade complicaciones tanto en el tratamiento de la litiasisureteral (6,1 vs 6,1%, OR 0,98 (0,45 a 2,19)) comoen el tratamiento de la litiasis renal (6,7 vs 5,2%, OR0,76 (0,13 a 4,46)).Conclusiones: La colocación preoperatoria delcatéter doble J mejoró la tasa LL en el tratamiento dela litiasis ureteral y renal, pero no disminuyó la tasa decomplicaciones.(AU)

Objetive: Aim of our study was to evaluate the effectiveness and safety of the preoperativeplacement of JJ stent compared to not doing in patientsundergoing ureteroscopy for ureteral and kidney stone.Materials and methods: Prospective, observational, multicenter study. Adult patients, who underwent ureteroscopy treatment for ureteral and kidney stone, wererecruited from August 2017 to March 2019, in 23Argentine institutions. The variables analyzed included:demographic data, stone size and location, stone-freerate (SFR) and complications.Results: 580 patients were included. 473 with ureteral stone (309 with and 164 without prior JJ stent)and 107 with kidney stone (77 with and 30 withoutprior JJ stent). The SFR was higher in the group withprevious JJ stent, both in the treatment of ureteral stone(82.2% vs. 90.9%, OR 2.15 (1.17 to 3.96)), and inthe treatment of kidney stone (73.3% vs. 89.6%, OR3.14 (1.02 to 9.61)). No differences were establishedin the complication rate both in the treatment of ureteralstone (6.1 vs. 6.1%, OR 0.98 (0.45 to 2.19)) and inthe treatment of kidney stone (6.7 vs. 5.2%, OR 0.76(0.13 a 4.46)).Conclusions: The preoperative placement of JJstent, increases SFR in the treatment of ureteral and kidney stone, but not decrease the complication rate.(AU)

Spontaneous fragmentation of JJ stent can occur as early as 3 weeks post-insertion: Case report.

Spontaneous JJ stent fragmentation can occur as early as 3 weeks post-insertion. This could be due to a hostile urine environment and might be avoided by strict dietary modification, adequate hydration, and close follow-up.

Effect of continuous antibiotic prophylaxis in children with postoperative JJ stents: A prospective randomized study.

OBJECTIVE: We aimed to investigate the effectiveness of continuous antibiotic prophylaxis (CAP) in patients with JJ stent and tried to identify the group that could specifically benefit from CAP by a prospective randomized study. METHODS: A prospective, randomized, controlled, non-blind, non-placebo study was performed in a single center.A total of 105 patients who underwent surgery with JJ stent (PNL, URS, pyeloplasty, UNC) were randomized into two groups. 53 patients in Group A received CAP and 52 patients in Group B were controlled without CAP, during the presence of a JJ stent. Patients with external stents, nephrostomy tubes, indwelling long-term urethral catheters were excluded. History of preoperative use of CAP and lower urinary tract symptoms were noted. Trimethoprim/sulfamethoxazole (TMP/SMX) was used as the initial choice of antibiotic however if there was a history of antibiotic resistance in previous urinary cultures, Nitrofurantoin was administrated. Urinary cultures were obtained before surgery and before stent extraction. JJ stents were sent to culture. Symptomatic febrile urinary tract infections with positive urine cultures (105 CFU on a clean catch or 103with urethral catheterization) were compared between groups. DISCUSSION: Our study has some limitations; the study is the single-center, we did not follow-up of patients in terms of scar, there were low number of uncircumcised patients, multiple types of surgical procedures were performed. JJ stent is a frequently used instrument in children. Unfortunately, any randomized prospective on antibiotics administration while using a JJ stent is not available in the current literature. We hope our research will contribute to the existing literature and cause a significant change in clinical practice. RESULTS: The mean age among all patients was 4.8 ± 3.9 years. The mean length of time jj stents stayed inside was 16.34 ± 6.45 days in group A and 15.29 ± 7.71 days in group B. The incidence of febrile urinary tract infections with CAP was significantly reduced (3.8% vs. 19% (p 0.015)). Multivariate regression analysis revealed that a positive history for preop febrile urinary tract infections and/or LUTS has a significantly higher association with the incidence of febrile urinary tract infecitons. CONCLUSIONS: CAP in the presence of JJ stents reduced the incidence of febrile urinary tract infections in a short period, especially in children with the previous history of febrile urinary tract infections and lower urinary tract symptoms.

Evaluation of YouTube Videos as a Source of Patient Information for Ureteric Stent Placement: A Quality Assessment Study.

OBJECTIVE: To assess the quality of YouTube videos on ureteric stent placement (USP) as a source of patient available. METHODS: YouTube was searched using search terms "DJ stenting," "Double J stenting," and "ureteric stenting." The initial 100 videos displayed with each of the above mentioned search terms were scrutinized. The selected videos reviewed by 3 independent consultant urologists against a pre-agreed scoring system based upon European Association of Urology (EAU) patient information sheet on ureteric stent placement. The videos were scored qualitatively and quantitatively based on the scores achieved in various domains of the scoring Performa. Data was also collected for the number of views, likes, dislikes, and time duration of each video. RESULTS: A total of 22 videos which fulfilled the inclusion criteria were reviewed. All the videos were uploaded by healthcare organizations or healthcare websites. None of the videos were classified as "Good" based on reviewer scores and only one video was classified as "acceptable." Fourteen videos were classified as "very poor" with a score of <5/20. General information about stents was described by majority of the studies whilst preoperative information, procedure description, danger signs, and follow up were scarcely described by most videos. CONCLUSION: Majority of YouTube videos on USP are of poor overall quality and lack pertinent information. This calls for creation of comprehensive and unbiased videos for patient information on USP.

The Effect of Ureteric Stenting on Female Sexual Function: A Prospective Cohort Study.

Background and objective Urolithiasis is a highly prevalent disease worldwide, with Pakistan belonging to the stone belt of Asia. The usage of the double J (DJ) stent is highly effective when it comes to the management of urolithiasis. However, studies investigating the side effects of DJ stent placement on sexual function in individuals are scarce. In this study, we aimed to assess the impact of DJ stent placement on sexual function in women. Methods After obtaining ethical approval, a prospective study was conducted at a university hospital from June 2018 to September 2019. All sexually active women requiring semi-rigid ureteroscopy (URS) or flexible URS [retrograde intrarenal surgery (RIRS)] were enrolled. Women with DJ stent placement (Group A) were compared to women who did not require DJ stent (Group B). The outcome variable was to assess temporary sexual dysfunction after DJ stent placement using the standardized Female Sexual Functionality Index (FSFI) in English or its validated vernacular version. The FSFI was completed at four weeks, and again at three months, following URS/RIRS. Results Of the 106 sexually active women initially included in the study, 69 were found to be eligible for final analysis. In Group A, the mean FSFI score at the initial presentation was 31.54 ±4.37. The mean FSFI score at four weeks was lower compared to the baseline score (0 time): 13.96 ±5.5 (p<0.05). At three months, the mean FSFI score returned to near baseline at 32.053 ±5.35 with no significant difference (p=0.65). In comparison to women in Group B, the mean FSFI score at four weeks was significantly lower in Group A (28.87 ±6.59 vs. 13.96 ±5.49; p<0.05). However, there was no significant difference between the mean FSFI scores at any of the three time points within Group B. Conclusion DJ stent insertion results in transient postoperative sexual dysfunction in women, which resolves spontaneously within a span of three months after stent removal.

[Upperurinary Tract Diversion With JJ Stent By Endoscopy : Indications, Results And Morbidity]. / Derivation Du Haut Appareil Urinaire Par Une Sonde Double J Par Voie Endoscopique : Indications, Resultats Et Morbidite.

OBJECTIVE: to report the indications and the results of the upper urinary tract by endoscopic route by a double J probe in our Center. PATIENTS AND METHODS: This was a retrospective mono-centric descriptive study from January 1st 2018 to June 30th 2019 including all patients that had a JJ stent as a type of upperurinary tract diversion. RESULTS: seventy four patients were included. The average age of patients was 43.6 ± 17.5 years. The sex-ratio was 0.6. The obstructive renal colic was the most common operative indication in 62.1% (46) of patients. The etiologies were dominated by urolithiasis with 39.1% (29) of patients. Anesthesia was general in 67.5% (50) and locoregional in 32.5% of patients (24). The procedure was performed without fluoroscopic control (blind) in 66.2% of cases(49), therewere 89.7% case of success (44 patients). The success rate was 86.5% (64) patients and the failure rate 13.5% (10) of patients. Five (6.7%) patients had a postoperative acute pyelonephritis complication requiringremoval of the JJ stent. CONCLUSION: The rise of the double J probe made possible to prepare the ureter, thus facilitating the endoscopic treatment of urinary lithiasis. The complication rate observed in our patients was low. The compliance with the rules of asepsis could reduce these complications.

OBJECTIF: rapporter les indications et les résultats de la dérivation du haut appareil urinaire par voie endoscopique par une sonde double J dans notre centre. PATIENTS ET MÉTHODES: Il s'agissait d'une étude prospective mono-centrique de type descriptif incluant tous les patients ayant eu une montée de sonde double J par voie endoscopique en première intention comme type de dérivation du haut appareil urinaire durant la période du 1 janvier 2018 au 30 juin 2019 dans notre centre. RÉSULTATS: Soixante-quatorze patients étaient inclus. L'âge moyen des patients était de 43,6 ± 17,5 ans avec un sex-ratio de 0,6. La colique néphrétique obstructive était l'indication opératoire la plus fréquente, objectivée chez 62,1 % (46) des patients. Une insuffisance rénale aiguë était notée chez 4 % (3) des patients. Les étiologies étaient dominées par la lithiase urinaire, objectivée chez 39,1 % (29) des patients. L'anesthésie était générale chez 67,5 % (50) et locorégionale chez 32,5 % des patients (24).En peropératoire, l'amplificateur de brillance était utilisé chez 33,7 % (25) et 66,3 % (49) des patients n'avaient pas de guidage fluoroscopique. Parmi ces derniers, le taux de succès opératoire était de 89,7 % (44 patients). Le taux de succès était de 86,5 % (64) des patients et le taux d'échec á 13,5 % (10) des patients. Cinq (6,7 %) patients avaient eu une complication postopératoire à type de pyélonéphrite aigue à risque de complication ayant nécessité le retrait de la sonde double J. CONCLUSION: La montée de sonde double J a permis de préparer l'uretère facilitant ainsi le traitement endoscopique des lithiases urinaires. Le taux de complication observée chez nos patients était faible. Le respect des règles d'asepsie contribuerait à diminuer ces complications.

Ureteric stenting with magnetic retrieval: an alternative to traditional methods.

INTRODUCTION: Ureteric stents are frequently placed following endo-urological procedures. These stents cause significant morbidity for patients. Standard ureteric stents are removed by flexible cystoscopy. This procedure can be unpleasant for patients and requires additional resources. A newly designed magnetic stent allows removal in an outpatient setting. The aim of our study is to compare the magnetic stent and standard ureteric stents with regard to morbidity, pain on stent removal and cost-effectiveness. METHODS: This study was carried out across two sites between September 2016 and July 2017. In site A, a magnetic stent (Urotech, Black-Star®) is removed by magnetic retrieval device. Fifty consecutive patients completed the validated Ureteric Stent Symptom Questionnaire (USSQ) and visual analogue scale (VAS) at the time of stent removal. On site B, a soft polyurethane stent (Cook Universa) was removed by flexible cystoscopy. Fifty patients were identified retrospectively and completed questionnaires by post. Cost analysis was also performed. RESULTS: One hundred questionnaires were included for analysis. No significant difference in stent morbidity as assessed by the USSQ was shown between both groups. Median duration of stenting was significantly shorter in the magnetic stent group (5.5 versus 21.5 days, p < 0.001). Mean pain on stent removal was significantly less with magnetic retrieval (2.9 versus 3.9, p < 0.05). Complication rates were similar in both groups. Cost analysis showed a cost saving of €203 per patient with the magnetic stent group. CONCLUSION: Magnetic stents cause similar morbidity for patients compared with standard stents removed by flexible cystoscopy; they are associated with less pain at removal and are cost saving.

Management of 'forgotten' encrusted JJ stents using extracorporeal shockwave lithotripsy: A single-centre experience.

Objective: To evaluate the role of extracorporeal shockwave lithotripsy (ESWL) for the management of 'forgotten' encrusted stents. Patients and Method: This is a retrospective study of 133 patients with forgotten JJ stents, treated between January 2015 and January 2018. Encrustation was mainly found in the renal coil of the stent with distal concomitant encrustation in the vesical and/or ureteric segment. After laboratory and radiological assessment, treatment started with ESWL for the renal encrustation before successful extraction. Auxiliary endourological procedures were used for the encrusted vesical or ureteric segments. Failed cases underwent open surgery. Results: The mean (SD; range) JJ stent indwelling time was 25.84 (10; 14-70) months. In all, 96 (72.2%) patients were seen after treatment for stone disease. In total, 94 patients (70.7%) were managed by ESWL monotherapy, whilst in 36 (27%) additional endourological procedures were required before successful extraction including: cystolithotripsy 19 patients (52.8%), ureteroscopic lithotripsy eight (22.2%), and percutaneous nephrolithotomy nine (25%). Open surgery was required in only three patients (2.3%). A mean of 0.28 procedures per patient was required before smooth stent extraction. The encrusted stents were removed after the first, second, third, and fourth ESWL sessions in 44 patients (33.1%), 43 (32.3%), 26 (19.5%), and 17 (12.8%), respectively. Patients with forgotten indwelling JJ stents for >2 years had significantly larger and harder encrustation at both JJ coils. Conclusion: ESWL proved a feasible first-line treatment for forgotten encrusted JJ stents. The indwelling time of forgotten stents in the urinary tract is associated with greater encrustation burden, density and multiple sites of encrustation. Abbreviations: CLT: cystolithotripsy; ESWL: extracorporeal shockwave lithotripsy; HU: Hounsfield unit; KUB: plain abdominal radiograph of the kidneys, ureters and bladder; PCNL: percutaneous nephrolithotomy; URL: ureteroscopic lithotripsy.

Effect of JJ stent on outcomes of extracorporeal shock wave lithotripsy treatment of moderate sized renal pelvic stones: A randomized prospective study. / Resultados de LEOCH con o sin catéter para el tratamiento de cálculos en la pelvis renal: un estudio aleatorizado.

PURPOSE: To evaluate the effect of JJ stents on SWL treatment of moderate (15-25mm) renal pelvic stones. MATERIALS AND METHODS: Between January 2016 and December 2017, a total of 152 adult patients who were planned to undergo SWL for a single radiopaque renal pelvic stone were included in the study. Patients with solitary kidney, congenital abnormality, skeletal tract abnormalities, previous urinary system surgery, hydronephrosis (grade 2 or more), untreated urinary tract infection, bleeding disorder, and suspected pregnancy were excluded. The remaining 114 patients were randomly divided into two groups; non-stented and stented. Twenty-two patients whose stone could not be fragmented despite 3 consecutive sessions were also excluded from the study. A total of 92 patients (54 non-stented and 38 stented) were included in the final analysis. RESULTS: There was no significant difference in terms of age, sex, body mass index, renal parancyhimal thickness, hydronephrosis, skin-to-stone distance, Hounsfield units, and stone size between the groups. Success was significantly higher in the stented group than in the non-stented group (71% vs. 39%, P=.002). In stone-free patients, the number of emergency department visits and analgesic tablet consumption was significantly lower in the stented group than in the non-stented group (P<.001 and P<.001, respectively). In non- stone-free patients, analgesic tablet consumption was significantly lower in the stented group than in the non-stented group (P=.004). CONCLUSIONS: Pre-stenting before SWL treatment of moderate sized renal pelvic stones has some advantages in terms of success, emergency service visits, and analgesic tablet consumption.

NDM-1-producing Enterobacter aerogenes isolated from a patient with a JJ ureteric stent in situ.

Urinary tract infections after JJ stent insertion are among the most common complications, and the associated microorganisms carry more antibiotic resistance determinants than those found in urine prior to stent insertion. In line with the trends in healthcare epidemiology which implicate multi-resistant microorganisms in a plethora of healthcare-associated infections, prosthetic stent material also represents an ideal milieu for biofilm formation and subsequent infection development with resistant bacterial agents. Here we describe a case of a 73-year-old Caucasian woman presenting with urinary tract infection after JJ ureteric stent insertion due to ureteric obstruction and hydronephrosis of her left kidney. Extensive microbiological work-up and comprehensive molecular analysis identified the putative microorganism as carbapenem-resistant Enterobacter aerogenes carrying New Delhi metallo-beta-lactamase 1 (NDM-1). This is a first literature report implicating such extensively resistant strain of this species in early indwelling ureteric stent complications, and also the first report of NDM-1 in Enterobacter aerogenes in Croatia and Europe.