Perfect outcome of kidney recipients with ureteral stenosis after treatment with open surgery under magnetic resonance urography localization

BackgroundTo evaluate the outcome of kidney recipients with ureteral stenosis after treatment with open surgery under magnetic resonance urography (MRU) localization.MethodsWe assessed 2,256 consecutive kidney transplant recipients between October 2010 and December 2018. Ureteral stenosis was detected by ultrasound, confirmed and positioned by Magnetic Resonance Urography. All patients underwent open ureteral reconstruction. The ureteral stenosis was located according to the location on the MRU during the operation. Surgical complications and recurrence rate were recorded in the stenosis group. Outcomes were compared with those of a matched control group of transplant recipients with no history of ureteric stenosis.ResultsThe incidence of ureteral stenosis in our center was 3.1% (70/2,256). Sixty-four cases (91.4%) were confirmed to have distal stenosis and were reconstructed with ureterovesical re-implantation; six cases (8.6%) were confirmed to have mid-distal stenosis and were subjected to ureteroureterostomy with the use of native ureter. The overall success rate was 100% and the graft function was salvaged in all cases. There was no recurrence of stenosis after a mean follow-up of 38.9±26.3 months. The complication rate was 5.7%. The 110-month graft survival and patient survival were not significantly different between the stenosis and control groups.ConclusionsMRU is an effective method for non-invasive and accurate diagnosis of ureteral stenosis in kidney transplant recipients. Open ureteral reconstruction surgery under MRU localization for treatment of ureter stenosis after kidney transplantation had a high success rate, low recurrence rate and high safety.     

Transplant ureter stricture: Acucise endoureterotomy and balloon dilation are effective

PATIENTS AND METHODS: Eight patients with ureteral stricture after renal transplantation underwent minimally invasive treatment with Acucise incision or balloon dilation. Acucise endoureterotomy was used to treat four patients with strictures at the ureterovesical anastomosis, and balloon dilation was used to treat four patients with a ureteroureterostomy stricture. Success was defined as an acceptable serum creatinine concentration in the absence of hydronephrosis with at least 1 year of follow-up. RESULTS: Acucise endoureterotomy for ureterovesical anastomosis stricture was successful in two of three patients (67%) with a mean follow-up of 20 months. One patient had an indeterminate outcome. Balloon dilation of strictured ureteroureterostomy was successful in three of four patients (75%) with a mean follow-up of 23.7 months. Three of the four patients with previously failed open revision were treated successfully with endourologic techniques. The two patients in whom treatment failed had strictures >/=1.5 cm and manifested comorbidities including diabetes mellitus. CONCLUSION: As our results are comparable to those of other published series, endourologic management of transplant ureteral stenosis is a reasonable strategy.     

The use of endoluminal ultrasonography for preventing significant bleeding during endopyelotomy: evaluation of helical computed tomography vs endoluminal ultrasonography for detecting crossing vessels

OBJECTIVE: To evaluate, in a prospective study, the efficiency of helical computed tomography (CT) and endoluminal ultrasonography (ELUS) for detecting significant crossing vessels, a major cause of bleeding complications when treating patients with pelvi-ureteric junction (PUJ) obstruction, and to compare our results using ELUS with those of an earlier multicentre study (not using ELUS), to see whether the complication rate decreased. PATIENTS AND METHODS: The study included 27 patients with a PUJ who had isotope renography, intravenous urography, helical CT and ELUS before surgery. Depending on the findings of ELUS, patients were treated with a pure lateral Acucise incision (Applied Medical, Irvine, CA, USA) an Acucise with changed cutting direction, or (later) a laparoscopic pyeloplasty. RESULTS: ELUS detected 15% more crossing vessels than helical CT; 16 patients had Acucise (seven lateral, nine other cutting direction), eight were treated with a laparoscopic pyeloplasty and three with other procedures. By contrast with earlier reports and as a consequence of using ELUS, there was no bleeding, vs 16% in the study not using ELUS. The success rate of 73% of the endourological approach is comparable with previous reports. CONCLUSION: ELUS is more sensitive in detecting relevant crossing vessels than helical CT and therefore the use of ELUS can better prevent bleeding complications. ELUS can also improve the success rate by helping in selecting the correct treatment. Because it is minimally invasive and safe, ELUS combined with Acucise (or other possible endourological techniques, like holmium laser incision) should be the first choice of treatment for PUJ stenosis.     

逆行球囊扩张治疗输尿管狭窄

目的：评价逆行球囊导管扩张治疗输尿管狭窄的效果。方法：采用逆行球囊导管对21例输尿管狭窄患者进行扩张治疗,其中结石导致的狭窄10例,输尿管开放手术后9例,盆腔放疗术后2例,扩张后留置双J管。结果：20例扩张成功,症状和肾积水缓解,肾功能不同程度改善,2例拔出双J管后发生再狭窄,肾积水无变化或加重需进一步治疗。结论：逆行球囊扩张治疗输尿管狭窄是一种安全有效、简便易行的方法,可以作为输尿管狭窄的首选治疗。     

输尿管结石行体外冲击波碎石治疗后发生输尿管狭窄的危险因素分析

目的探讨输尿管结石经体外冲击波碎石治疗后发生狭窄的危险因素。方法收集2006年7月至2011年7月就诊于我院首次行体外冲击波碎石治疗的输尿管结石患者的临床资料,先对所取临床指标进行单因素分析,然后进行Logistic多因素回归分析。结果共收集行体外冲击波碎石的输尿管结石患者174例,其中发生术后输尿管狭窄的患者15例,狭窄发生率为8.62%,单因素分析显示:结石长径、肾积水程度、结石嵌顿时间以及碎石次数与术后输尿管狭窄发生相关,多因素Logistic回归分析结果显示:结石长径、肾积水程度以及碎石次数是患者发生输尿管狭窄的独立危险因素。结论对于肾积水程度较重、结石长径较大、预期碎石次数较多的输尿管结石患者,行体外冲击波碎石后发生狭窄的可能性相对较高,在治疗选择上应更加慎重,提倡选择体外冲击波碎石之外更加安全有效的治疗方式。     

球囊扩张联合钬激光治疗输尿管狭窄21例临床观察

目的：探讨球囊扩张联合输尿管镜钬激光内切开治疗输尿管狭窄的临床效果。方法：对21例输尿管狭窄的病例,行球囊扩张联合输尿管镜钬激光内切开术治疗,同时处理合并的输尿管结石。结果：21例患者总有效率95％,其中治愈率80．9％、好转率14．2％,1例无效;随访6个月,合并的输尿管结石粉碎后均排出。结论：球囊扩张联合输尿管镜钬激光内切开是治疗输尿管狭窄的首选方法,具有效果满意、创伤小、恢复快和安全等优点。     

Treatment of ureteral complications after kidney transplantation with native ureteropyelostomy reduces the risk of pyelonephritis

Lehmann K, Müller MK, Schiesser M, Wildi S, Fehr T, Wüthrich RP, Clavien P‐A, Weber M. Treatment of ureteral complications after kidney transplantation with native ureteropyelostomy reduces the risk of pyelonephritis.
Clin Transplant 2011: 25: 201–206. © 2010 John Wiley & Sons A/S. Abstract: Urological complications contribute to morbidity and graft loss after kidney transplantation. Aim of this study was to assess the role of revisional surgery on patient outcome. From 1997 to 2007, 887 patients underwent kidney transplantation in our institution. Clinical data of patients with urological complications were analyzed. Ureteral complications were observed in 50 of 887 (5.6%) recipients, including ureteral necrosis (0.9%), stenosis (3.6%) and ureteral reflux with recurrent graft pyelonephritis (1.1%). Thirty‐five patients underwent native ureteropyelostomy, and 14 patients had redo‐ureterocystostomy. All patients treated for recurrent graft pyelonephritis had no further episodes. Overall, the rate of ureteral stenosis was significantly higher after secondary surgery, compared to the primary anastomosis (10% vs. 3.6%, p = 0.039). A significantly lower incidence of graft pyelonephritis was observed in patients after native ureteropyelostomy compared to patients treated with redo‐ureterocystostomy (p = 0.019). In conclusion, reflux and recurrent graft pyelonephritis can be treated effectively by secondary surgery. The use of native ureteropyelostomy may offer protection from graft pyelonephritis after secondary surgery.     

输尿管镜钬激光内切开术治疗输尿管狭窄

目的探讨输尿管镜钬激光内切开术治疗输尿管狭窄的疗效。方珐本组10例输尿管狭窄，狭窄位于输尿管上段6例，中段1例，下段3例，输尿管狭窄段长度为0．3—1．8cm，采用输尿管镜钬激光（200μm激光光纤，输出能量0．8—1．0J，脉冲频率10-15Hz）内切开术治疗，术后留置1根或2根F5双J支架管，2～3个月后拔管。蛄杲手术时间30-50min，平均42min，无严重并发症，1例手术失败，余9例随访5—15个月，平均9．5个月，8例效果满意，1例术后3个月复发。站论输尿管镜钬激光内切开术治疗输尿管狭窄具有创伤小、并发症少、恢复快等优点，是一种安全、有效的微创手术方式。     

Comparison of tandem ureteral stents,cryoplasty, and cutting balloon ureteroplasty in treatment of refractory transplant ureteral strictures

The objective of study was to compare clinical outcome of cryoplasty, tandem stents, and cutting balloon ureteroplasty as “bailout procedures” to prevent surgical intervention or stent dependency in renal transplant patients with refractory ureteral stricture. All patients who underwent a bailout procedure from June 11, 2003, to August 8, 2015, at a single institution were reviewed retrospectively. Refractory ureteral stricture was defined as ureteral stenosis not responding to at least two prior percutaneous plain balloon ureteroplasties. Primary patency was defined as stable allograft function following the procedure with unobstructed urine outflow, not requiring indwelling ureteral stent, repeat ureteroplasty, or surgical revision. Sixty-one procedures were performed on 51 patients. Patients were followed up for a median of 286 days. Overall primary patency rate was 26.1%. Primary patency rate by method was 38.1%, 23.1%, and 14.3% after cryoplasty, tandem stent placement, and cutting balloon dilatation, respectively (P = .260). Primary patency rate was higher in early (<3 months post-transplant) ureteral strictures (35.7% vs 13.3%; P = .047). More complications identified in patients who had tandem ureteral stents (P = .00754). As some renal transplant patients may not be good operative candidates for ureteral revision, it would be reasonable to attempt one of these “bailout” interventions as long as the clinical team and patient are aware of overall low potential for achieving primary patency.     

Successful long-term outcome using existing native cutaneous ureterostomy for renal transplant drainage

PURPOSE: We report our long-term experience with a preexisting native cutaneous ureterostomy via an ipsilateral transplant ureteral native ureterostomy for transplant drainage without native nephrectomy. MATERIALS AND METHODS: Between 1993 and 1998, 5 patients without a usable bladder had undergone previously urinary diversion via cutaneous ureterostomy. All patients had a well functioning cutaneous ureterostomy for a mean plus or minus standard deviation of 18+/-12 years before renal transplantation. No patient had a history of stomal stenosis, recent urinary tract infection or pyelonephritis. RESULTS: All 5 patients continued to have a functioning renal transplant at last mean followup of 36+/-6.6 months. Complications included stomal retraction due to postoperative weight gain requiring revision in 2 cases and ureteroureteral anastomotic stenosis treated with endopyelotomy in 1. Mean serum creatinine at last followup was 1.5+/-0.6 mg./dl. CONCLUSIONS: Of the complications that we present only 1 may be attributed to the singularity of our procedure. Our experience suggests that a preexisting native cutaneous ureterostomy may serve as a receptacle for transplant ureteral drainage in select patients with excellent long-term function.     

Endoscopic features of impacted ureteral stones

PURPOSE: We retrospectively evaluated endoscopic findings in 165 patients with impacted ureteral stones to determine the incidence of associated ureteral lesions and predisposing factors for such lesions. MATERIALS AND METHODS: From July 1993 to March 2003 we performed retrograde endoscopic treatment in 165 patients with ureteral stones that had been impacted for more than 2 months. Average maximum stone diameter was 15.0 mm and the mean duration of impaction was 17.6 months. Treatment was done with small caliber ureteroscopes and a laser lithotriptor. We analyzed the endoscopic findings and determined the outcome by reviewing the clinical records and radiographic studies. RESULTS: Endoscopic observation revealed inflammatory ureteral polyps associated with calculi in 51 patients (30.9%). Endoscopic biopsy of 5 polyps was performed. Histological examination showed no malignancy and only chronic granulomatous inflammation of the ureter. Endoscopic observation also detected ureteral stricture in 28 patients (17.0%). Patients with polyps and strictures had long-term impaction (median 12 and 24 months, respectively), which was significantly longer than in patients without ureteral lesions (4 months). CONCLUSIONS: Endoscopic observation revealed that long-term impacted stones were frequently associated with ureteral polyps and strictures. Although concurrent ureteral lesions can make it more difficult to approach the calculus in patients with impacted stones, we found that a small caliber flexible endoscope was effective and laser fragmentation could be achieved easily.     

LONG-TERM RESULTS OF THE TREATMENT OF COMPLETE DISTAL URETERAL STENOSIS USING A CUTTING BALLOON CATHETER DEVICE

PURPOSE: We evaluated the long-term efficacy of endoscopic treatment of complete distal ureteral stenosis using a cutting balloon catheter. MATERIALS AND METHODS: We performed a total of 10 procedures in 9 patients with complete distal ureteral stenosis at or near the ureterovesical junction. Depending on presenting anatomy cases were treated with a retrograde only (6), antegrade only (1) or combined antegrade and retrograde (3) endoscopic technique. RESULTS: At a mean followup of 36 months (range 24 to 43) 9 of the 10 procedures (90%) were successful. Stenosis recurred in 1 of the 9 patients (10%) but a repeat procedure was successful. There were no intraoperative complications and no procedures required open surgical conversion. Although all patients noticed a various degree of hematuria postoperatively, none required blood transfusion or further intervention. Mean hospitalization was 1.1 days. CONCLUSIONS: Endoscopic repair of distal ureteral stenosis using a cutting balloon catheter is a viable option in patients with complete ureteral obstruction. This technique results in low morbidity, a short hospital stay and excellent long-term patency. Endoscopic treatment using a cutting balloon catheter may be a therapeutic option in many patients with complete distal ureteral obstruction at or near the ureterovesical junction.     

Late Ureteral Stenosis Following Renal Transplantation: Risk Factors and Impact on Patient and Graft Survival

The aim of this retrospective study of a cohort of 1787 consecutive kidney transplantations was to analyze the risk factors associated with the occurrence of ureteral stenosis and the impact of ureteral stenosis on graft and patient survival. Between January 1990 and December 2002, 1787 renal transplantations were performed at our center. Only stenosis observed after the first month, were considered. Among the parameters studied were: donor age and serum creatinine before procurement; recipient age, cold ischemia time, delayed graft function (DGF), number of arteries and the presence of a double J stent. The follow-up parameters were the number and timing of acute rejection episodes, cytomegalovirus (CMV) infection, acute pyelonephritis, renal function and death. Ureteral stenosis occurred in 4.1% of patients and was correlated with donor age > 65 years (p = 0.001), kidneys with more than 2 arteries (p = 0.009) and DGF (p = 0.016). Ureteral stenosis did not affect 10-year patient and graft survival rates, which were respectively 90% and 64% for the stenosis group, 86% and 63% for the no-stenosis group (p = NS). These data suggest an important role for donor age, number of renal arteries and DGF for the occurrence of ureteral stenosis following renal transplantation.     

Rigid ureteroscopy for the treatment of ureteral calculi in children

PURPOSE: We assess the safety and efficacy of rigid ureteroscopy for the treatment of pediatric ureterolithiasis. MATERIALS AND METHODS: The records of 33 children with an average age of 7.4 years (range 9 months to 15 years) treated with rigid ureteroscopy between May 1995 and July 2003 were reviewed. In 35 ureteral units use of a rigid 6.9 to 10Fr ureteroscope was planned for treating stones at various levels of the ureter. Stones were located in the upper ureter in 6 cases, middle ureter in 3 and lower ureter in 26. Dilatation of the ureteral orifice was necessary in 11 cases. RESULTS: Stone size varied from 3 to 10 mm (mean 5.3). In 33 patients (94%) all stone fragments were removed successfully. Stones were fragmented with pneumatic lithotripsy in 20 cases and removed by forceps without fragmentation in 13. In 1 child an upper ureteral stone migrated up to the kidney during ureteroscopy but following extracorporeal shock lithotripsy therapy she was rendered stone-free. In another child it was not possible to remove the stone. In a 9-month-old female patient with bilateral stones it was not possible to enter the left ureter because of a tight orifice resistant to balloon dilation. At the end of the procedure a 3 or 4Fr ureteral or a 4.8Fr Double-J (Medical Engineering Corp., New York, New York) stent was left in place for 3 days to 3 weeks in 12 cases. There were no cases of ureteral perforation. Of the patients 31 were followed for 1 to 36 months. No incidence of vesicoureteral reflux was detected in 9 who underwent postoperative cystography. CONCLUSIONS: After becoming experienced and meticulously working with finer instruments in adults, rigid ureteroscopy can be a safe and efficient treatment for ureteral stones in every location in children.     

钬激光治疗输尿管结石并发狭窄的处理策略

目的：探讨腔内钬激光治疗输尿管结石并发狭窄的处理策略.方法：收集36例输尿管镜下钬激光切开治疗输尿管结石并发狭窄患者的临床资料.结果：35例手术成功,1例单纯壁间段狭窄者予钬激光切开后仍无法上行,手术终止.术后共随访12～45个月,平均（23.8±9.5）个月.30例治愈或好转,有效率为83.3%（30/36）.6例无效（5例术后1～3个月结石复发,复行腔内激光手术,随访18～24个月,其中4例治疗有效,1例效果不佳.结论：经尿道钬激光碎石术（TUL）在治疗上尿路结石时可同时处理输尿管狭窄,是一种安全有效的手段.钬激光切开治疗狭窄的疗效（85.2%,23/27）要好于硬性扩张（77.8%,7/9）,但两者比较无统计学意义（P＞0.05）根据术中具体情况实施操作可能更具实用价值,不仅能够减少操作所需时间,且预后理想.我们倾向性认为中下段狭窄的预后（93.1%,27/29）较上段（57.1%,4/7）较好（P＜0.05）,但其处理方法选择标准及处理策略仍有待进一步探讨和完善.     

输尿管镜碎石术后输尿管狭窄的治疗

目的研究输尿管镜碎石术后输尿管狭窄的治疗方法及效果。方法回顾性分析北京清华长庚医院2014年12月-2018年2月收治的输尿管镜碎石术后输尿管狭窄患者的临床资料。初次治疗、输尿管狭窄长度<2 cm的患者首选以内腔镜下治疗为主的手术方式(内腔镜下球囊扩张或球囊扩张+内切开)为内镜组,既往治疗失败或狭窄长度>2 cm的患者选择以尿路重建手术为主的治疗方式为腹腔镜/开放组,记录并观察患者术后发热、腰痛、留置输尿管支架管或肾造瘘管、超声、CT尿路造影、利尿肾图等情况。结果34例行内腔镜下治疗,11例行开放/腹腔镜尿路重建手术。内腔镜治疗病例中73.5%(25例)为初次治疗,尿路重建病例中63.6%(7例)术前有输尿管狭窄治疗史。内腔镜手术有效率44%,尿路重建术有效率76%,尿路重建术有效率为内腔镜治疗的1.73倍。结论虽然尿路重建手术有效率明显高于内腔镜下治疗,对于选择合适的病例,内腔镜手术仍可作为输尿管镜碎石术后输尿管狭窄的一线治疗。初次治疗可采用内腔镜治疗,有既往治疗史的患者则以尿路重建手术为主。     

结石远端狭窄导致输尿管镜碎石失败的处理

目的探讨因结石远端输尿管狭窄而导致经尿道输尿管镜碎石术失败的处理方式。方法回顾性研究我院14例输尿管镜碎石术镜体上行失败患者资料及处理方法,结石长径0.6~1.4cm,横径0.5~1.0cm,输尿管上段结石4例,中段结石4例,下段结石6例。结果 3例行一期输尿管切开取石术,9例行输尿管扩张后二期输尿管镜碎石术,其中6例成功,失败3例改行输尿管切开取石术,另余2例行留置输尿管双J管的体外冲击波碎石术治愈。结论一期输尿管镜碎石术术中镜体上行失败的患者可尝试留置输尿管双J管或结石远端输尿管导管,2~4周内再次行输尿管镜碎石术有望获得较高的手术成功率。     

输尿管镜腔内治疗输尿管狭窄的临床分析

目的探讨输尿管镜腔内治疗输尿管狭窄的临床疗效。方法回顾性分析2008年12月～2010年12月输尿管狭窄89例的临床资料,其中肾盂输尿管连接部狭窄7例,输尿管上段狭窄38例、中段狭窄16例、下段狭窄28例。狭窄段长度0.5～1.5 cm。采用腔内输尿管扩张治疗29例,自制单极电刀内切开治疗7例,钬激光内切开治疗53例。术后留置1根或2根F6输尿管内支架管,3～6个月后拔除。结果手术时间5～40 min,平均16.5 min。2例因并发输尿管穿孔中转开放手术,其余无严重并发症发生。术后随访6～12个月,平均8.9月。81例(91.0%)临床治愈,术后经超声、静脉肾盂造影等影像学检查显示肾盂积水明显好转,输尿管扩张减轻,狭窄段消失或较治疗前增宽;8例(9.0%)狭窄复发,再次行腔内治疗治愈。结论输尿管镜腔内治疗输尿管狭窄具有创伤小、手术时间短、并发症少、恢复快等优点,是一种安全、有效的微创治疗方法。     

输尿管镜钬激光碎石术治疗输尿管上段结石52例报告

目的:探讨输尿管镜钬激光碎石术治疗输尿管上段结石的临床效果.方法:采用输尿管镜下钬激光碎石术治疗输尿管上段结石患者52例,其中双侧输尿管上段结石2例,共计左侧30例侧,右侧24例侧.结石大小(0.4～1.7)cm×(0.6～2.0)cm.结果:手术成功率98.1%,平均手术时间约28 min(17～65 min).1例侧因输尿管口狭窄进镜困难改行开放手术.术后1个月复查,一次性碎石排净率为90.6%,5例侧有结石残留患者保留双J管行ESWL治疗,结石排出.术后3个月复查,所有患者患侧肾积水均明显减轻.结论:在熟练掌握输尿管镜操作技术的前提下,采用输尿管镜钬激光治疗输尿管上段结石是一种安全、有效的方法.     

Endopyelotomy with ureteral cutting balloon device: long-term follow up of 13 patients]

BACKGROUND: This study investigated the feasibility and long term results of retrograde endopyelotomy with the Acucise ureteral cutting balloon device in the management of ureteropelvic junction (UPJ) obstruction. METHODS: Thirteen patients (primary: 12, secondary: 1, male: 7, female: 6, mean age: 36) with UPJ obstruction were treated by the Acucise under fluoroscopic guidance. After cutting the stenotic area electrically using cutting wire and dilatation by the balloon, ureteral catheter (7-14 Fr) was inserted for 6-8 weeks. RESULTS: The mean operative time was 43 minutes, the median postoperative hospital stay was 4 days. The subjective success rate (disappearance of the abdominal pain) was 92% (11/12) and the objective success rate evaluated by radiographic studies was 62% (8/13). One patient needed a transfusion but no other major complication occurred in the treatment. The failure 5 patients were now under conservative follow up. CONCLUSION: Our limited data suggest that endopyelotomy with the Acucise device offer lower morbidity with slightly lower success rate compared other endopyelotomies. We believe that Acucise endopyelotomy can be an appropriate one of the first-line therapy for UPJO.