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Purpose: The aim of this study was to assess the long-term outcomes of retroperitoneoscopic one-trocar-assisted pyeloplasty (OTAP) for ureteropelvic junction obstruction (UPJO) in children. Methods: This retrospective analysis included 70 pediatric cases, all under the age of 5, diagnosed with UPJO and treated with the OTAP technique between May 2011 and June 2013 by a single surgeon. A single 10 mm operative scope with a 5 mm working channel was utilized to mobilize the ureteropelvic junction (UPJ) and exteriorize it through the trocar insertion site. Subsequently, conventional Anderson–Hynes dismembered pyeloplasty was conducted extracorporeally. Patient's demographics, operative time, hospital stay, complications, and success rate were evaluated. Results: Seventy pediatric patients (65 males and 5 females) underwent OTAP, with ages at the time of operation ranging from 1 month to 5 years (mean = 22.6 ± 18.6 months). The mean operative time was 74.8 ± 15.2 min. There was a significant reduction in the mean renal pelvis size from 34.3 ± 8.1 mm preoperatively to 13.8 ± 4.7 mm postoperatively (p < 0.05). Moreover, the mean differential renal function (DRF) increased from 47.9 ± 9.8% preoperatively to 51.2 ± 5.9% postoperatively (p < 0.05). All patients experienced an uneventful postoperative recovery, with a median hospital stay of 3.4 days. The success rate was 95.7%, with a median follow-up time of 75 months (range: 6–125 months). Conclusion: OTAP is a safe and feasible minimally invasive technique to correct ureteropelvic junction obstruction in children. It could be considered as a treatment of choice for children under the age of 5 as it combines the advantages of open and retroperitoneoscopic pyeloplasty and presents excellent long-term outcomes. Trial registration number: NCT06349161 April 4th, 2024, retrospectively registered. [ABSTRACT FROM AUTHOR]

Objective: To explore the usefulness of the 'differential renal length index' (iDRL) before and after pyeloplasty, as the anteroposterior diameter is commonly used to quantify hydronephrosis but inaccuracies arise due to interobserver variability, hydration status and pure intra‐renal dilatation. Patients and Methods: Prospectively collected data, from two centres, of all children undergoing pyeloplasty for isolated unilateral pelvi‐ureteric junction obstruction (PUJO) (2015–2021) were analysed. Subgroup analysis was undertaken: Group A – differential renal function (DRF) ≥40%, Group B – subnormal DRF (20–39%), and Group C – symptomatic. Children with structural anomalies of upper and lower urinary tract, bilateral involvement, and subnormal DRF (<20%) were excluded. All the children had a pre‐ and postoperative ultrasound scan and Tc99m mercapto‐acetyltriglycine (MAG3) renograms. The iDRL was calculated as follows: iDRL = ([a – b]/b) × 100, where 'a' is the length of hydronephrotic kidney (cm) and 'b' is the length of contralateral normal kidney (cm). The mean difference and standard error of mean (SEM) between the pre‐ and postoperative iDRL was evaluated using the paired Student's t‐test, with P < 0.05 considered statistically significant. Results: A total of 119 children with 1‐year follow‐up were included. For the entire cohort, the mean (SEM) preoperative iDRL was 27.7 (1.4) and postoperatively was 12.5 (1.1), with a mean (range) DRF improvement of 54% (44–66%) (P < 0.001). In Group A (n = 97), the mean (SEM) preoperative iDRL was 26.6 (1.5) and postoperatively was 13.1 (1.2), with a mean (range) DRF improvement of 50% (38–63%) (P < 0.001). In Group B (n = 22), the mean (SEM) preoperative iDRL was 32.6 (3.5) and postoperatively was 10.0 (2.8), with a mean (range) DRF improvement of 69% (49–89%) (P < 0.001). In Group C (n = 28), the mean (SEM) preoperative iDRL was 19.9 (2.3) and postoperatively was 7.7 (1.9), with a mean (range) DRF improvement of 61% (38–85%) (P < 0.001). Conclusion: Our study identifies the iDRL as a useful measure of improvement following successful pyeloplasty. In the subgroup with DRF of >39% minimum improvement was >37%. Similar minimum DRF improvement was also noted (>37%) in hypo‐functioning kidneys and symptomatic PUJO. [ABSTRACT FROM AUTHOR]

Purpose: To evaluate the impact of surgical intervention on long-term renal outcomes for adult patients with congenital ureteropelvic junction obstruction (UPJO). Methods: We queried service members diagnosed with UPJO from the United States Military Health System electronic health records from 2005 to 2020. We assessed demographic, laboratory, radiology, surgical intervention, and outcome data. We evaluated the impact of surgical intervention on renal function based on the estimated glomerular filtration rate (eGFR), hypertension (HTN, defined as any prescription for blood pressure [BP] medication and/or average of two BP readings ≥ 130/80 mmHg more than 2 weeks apart), and changes in renal excretory function on radionuclide scans. Results: We identified 108 individuals diagnosed with congenital UPJO; mean follow-up of 7 years. Mean age at diagnosis was 25 years; 95% male; 69% White, 15% Black. At diagnosis, median BP was 130/78 mmHg and mean eGFR 93 ml/min/1.73m2. Subsequently, 85% had pyeloplasty and 23% had stent placement. There were no significant differences in mean eGFR pre- and post-intervention (94 vs. 93 ml/min/1.73m2, respectively; p = 0.15) and prevalence of defined HTN (59% vs. 61%, respectively; p = 0.20). Surgical intervention for right-sided UPJO significantly reduced the proportion of patients with delayed cortical excretion (54% pre vs. 35% post, p = 0.01) and T½ emptying time (35 min vs. 19 min, p = 0.009). Similar trends occurred with left-sided UPJO but were not significant. Conclusion: Surgical intervention was not associated with significant differences in the long-term outcomes of kidney function and HTN prevalence in our young adult cohort. However, renal excretory function improved on radionuclide scans. [ABSTRACT FROM AUTHOR]

Objectives: To explore surgical, functional, and symptomatic outcomes in a series of patients who underwent robot-assisted laparoscopic Anderson–Hynes pyeloplasty (RALP) for ureteropelvic junction obstruction using the DaVinci Si surgical robotic system. Methods: Retrospective study including patients aged 16 years or older who underwent RALP from June 2016 to December2021. The following outcomes were recorded: operative outcome and complications [classified according to the Clavien–Dindo Classification (CD)] within 30 days of the procedure as well as 1 year success rate and restenosis during follow-up. Results: In total, 194 patients were available for analyses with a median follow-up of 4.5 (IQR 3.0-6.0) years. The primary indications were loss of kidney function (45%), pain (36%), infection (11%), kidney stone (6%), and others (2%). The median operation time was 134 min (IQR 112-159), the median length of stay was 2 days (IQR 2-2), and the median time with double-j stent postoperatively was 24 days (IQR 22-27). Overall, 65 out of 194 patients (33%) experienced a postoperative complication (12% CD I, 13% CD II, 8% CD IIIa or IIIb). The 1 year success rate was 92% for patients treated because of deteriorating renal function, 78% for patients treated because of symptoms, 82% for patients treated because of infections, and 78% for patients treated because of kidney stones. Seven percent of the patients presented a recurrent ureteropelvic junction stricture during follow-up. Conclusions: In our experience, robot-assisted laparoscopic Anderson–Hynes pyeloplasty performed with the DaVinci Si system is a safe with a few major complications and acceptable success rate. [ABSTRACT FROM AUTHOR]

Background: Modified Anderson-Hynes pyeloplasty is currently preferred for ureteropelvic junction obstruction (UPJO). Extravasation of urine and anastomotic stenosis are the most common complications after Anderson-Hynes pyeloplasty, which are closely linked with the technique for anastomosis. However, there are currently no clear guidelines for the suture bite depth in suturing the anastomosis during pyeloplasty. Objective: To analyze the optimal suture bite depth in laparoscopic Anderson-Hynes pyeloplasty. Study Design: A total of 90 children aged 4–14 years with UPJO-induced hydronephrosis who were surgically treated in the First People's Hospital of Lianyungang from July 2019 to July 2022 were prospectively recruited. All received laparoscopic Anderson-Hynes pyeloplasty using 5-0 Vicryl continuous sutures. According to the suture bite depth, the patients were divided into group A (depth 1 mm, n = 46) and group B (depth 0.5 mm, n = 44). Operation time, postoperative drainage volume, time of ureteral stent removal, incidence of postoperative complications, and time to hydronephrosis resolution were compared between groups. Results: Group A showed significantly less postoperative drainage volume, and shorter time of ureteral stent removal and hydronephrosis resolution (all P < .05). Four cases in group B received replacement of a double-J stent. Except for 1 patient receiving reoperation for anastomotic stenosis caused by massive extravasation of urine, the replaced double-J stent was successfully removed from the remaining 3 patients at 3 months, and the symptoms of anastomotic stenosis disappeared. No significant difference was detected in the operation time between groups (P > .05). Conclusion: An appropriate deeper suture bite depth for anastomosis may reduce postoperative urine extravasation and related complications in children who received laparoscopic pyeloplasty for UPJO-induced hydronephrosis. [ABSTRACT FROM AUTHOR]

To investigate the feasibility of single-port (SP) robotic pyeloplasty by comparing perioperative outcomes with those of multiport (MP) robotic pyeloplasty. We reviewed the data from patients who underwent robot-assisted pyeloplasty for ureteropelvic junction obstruction (UPJO) at a single tertiary institution between March 2016 and May 2022. Radiographic and symptomatic improvements were assessed 3 months postoperatively. Propensity score matching was performed for age, sex, body mass index, and hydronephrosis grade. Of the 15 S P-pyeloplasty and 28 MP-pyeloplasty cases, 14 from each group were matched using 1:1 matching. The SP group had shorter console and operative times without significant differences. Blood loss was lower in the SP group than in the MP group (p = 0.019). The length of hospital stay, opioid use on the operative day, and pain score at discharge did not differ between the two groups. The mean cost for surgery was higher in the SP group than in the MP group (p < 0.001). The mean cost of hospitalization was comparable between the two groups (p = 0.083). The cosmetic numerical rating scale scores were significantly higher in the SP group (p = 0.014). Symptoms improved in all patients, and the radiographic improvement rates were 92.9% in the SP group and 100% in the MP group. SP-pyeloplasty showed cosmetic benefits, lower blood loss, operative time, and console time compared with MP-pyeloplasty. In patients who underwent surgery for UPJO for the first time, SP surgery can show comparable outcomes when compared to MP surgery. [ABSTRACT FROM AUTHOR]

To analyze the clinical characteristics of ureteropelvic junction obstruction (UPJO) caused by crossing vessels (CV) in infants and young children. A retrospective analysis was performed on children with UPJO who underwent primary surgery. Patients were classified into laparoscopic pyeloplasty (LP) and open pyeloplasty (OP) groups and classified as ≤3 or >3 (years old) groups. Children with CV-caused UPJO were identified. A total of 747 patients were included. Ninety cases of CV were identified. The CV discovery rate was higher in the LP group (78/457, 17.1%) than in the OP group (12/290, 4.1%) (P < 0.001). In the ≤3 group, the CV discovery rate in the LP group (27/144, 18.8%) was higher than that in the OP group (11/274, 4.0%) (P < 0.001). In the LP group, there was no significant difference between ≤3 (27/144, 18.8%) and >3 (51/313, 16.3%) groups in the CV discovery rate. The rate in children with UPJO was not significantly different at any age (P > 0.05). Progressive aggravation of hydronephrosis (21/27, 77.8%) and symptomatic hydronephrosis (44/51, 86.3%) were the main surgical indications in the ≤3 and > 3 groups, respectively. There were no preoperatively confirmed cases of CV in the ≤3 group. In the OP group, five patients underwent reoperation, three of whom were due to failure to detect CV during the initial operation. The CV distribution is similar in children with UPJO across all ages; CV in infants and young children are not rare. LP should be considered as CV are prone to being missed during OP. III. • What is currently known about this topic? Crossing vessels-caused UPJO was reported to be more common in older children. There are few studies on crossing vessels-caused UPJO in infants and young children and on the age distribution of crossing vessels in children with UPJO. • What new information is contained in this article? The distribution of crossing vessels is similar in children of all ages with UPJO, and crossing vessels are not rare in infants and young children. [ABSTRACT FROM AUTHOR]

Background: Indwelling double-J-stent (DJ stent) kept post-urological procedures may cause urinary tract infections (UTIs) due to polymicrobial biofilm formation and colonisation. AIMS: To determine the incidence and microbiological characteristics of DJ stent related UTIs in a paediatric population. Methods and Material: Patients under the age of 18 admitted for DJ stent removal following pediatric urological procedures were enrolled into the study. Prior to surgical removal of the DJ stent, a urine sample was collected and the stent was cystoscopically removed under anesthesia. The ends of the stent were inoculated into culture media and incubated up to 48 hours. When growth was observed, an antibiogram was obtained using a panel of anti-microbial agents. Results: The study group consisted of 27 patients (M:F = 23:4) with a mean age of 4.3 years (1 month – 13 years). The commonest indication for stent placement was Pyeloplasty, 19 (70%). Stent colonisation was found in 8 out of 27 patients (29.6%; CI 12-51%) and E.Coli (33%) was the commonest organism. Polymicrobial growth was noted in 4 patients. Organisms were sensitive to Cephaerazone/ Sulbactam and Amikacin, and resistant to other Cephalosporins. All 8 culture positive patients were asymptomatic and a repeat urine culture revealed no growth. Colonisation did not lead to active UTI and post stent removal the urine became sterile. Conclusions: Microbial colonisation was noted in 30% of patients with indwelling DJ stents. Prior knowledge of culture & sensitivity pattern helps to cover the patients with appropriate antibiotic on the day of stent removal.

Background: Ureteropelvic junction obstruction (UPJO) is the most common cause of antenatal hydronephrosis. Although majority of them improve with time, none of the existing diagnostic modalities can accurately predict which hydronephrotic kidney is at the risk of progressive renal damage and will benefit from early surgery. Postural variations in the anteroposterior pelvic diameter (APPD) of the hydronephrotic kidney in children during follow-up postnatal ultrasonography (USG) reflect the intrapelvic tension, which might help in predicting the need of surgery amongst these patients. Materials and Methods: We designed this prospective observational study in all unilateral UPJO patients on postural variation in the APPD of renal pelvis on ultrasonography. The mean age of all patients were 2.15 years (0-5 years) and managed at our institute at All India Institute of Medical Sciences, Bhubaneswar. The study duration was from July 2019 to May 2021. The management of these patients was done as per the standard institutional protocol and there was no deviation due to inclusion in this study. We documented the variations in postural APPD both amongst the conservatively managed group and the surgically managed group of patients. Linear correlation between two continuous variables was explored using Pearson’s correlation (if the data were normally distributed) and Spearman’s correlation (for non-normally distributed data). Results: We found a higher prone APPD than supine APPD in all these patients indicating the obstruction at ureteropelvic junction. However, in the surgical group, there was less variation in the postural APPD compared to the conservative group, and when there was no variation in the postural APPD, the need of surgery was 100%. The limitation of our study was the small sample size (n = 36). A study involving a larger population or involving multiple institutions may further add significance to our findings. Conclusion: We found less postural variation in APPD on USG to be more likely associated with severe UPJO requiring early surgery. This may indicate a non-compliant renal pelvis. However, it was statistically not significant.

One in seven neonates on antenatal scan detected hydronephrosis has Pelviureteric Junction Obstruction (PUJO), making PUJO one of the most common cause of congenital urinary tract obstruction, with an incidence of one in 1000 to one in 2000 live births. Hereby, the authors present a case report of 19-year-old female who presented with pain in abdomen since, two weeks. There was no history of dysuria, haematuria. No history of lower urinary tract symptoms. No history of fever. There was no history of co-morbidity. No similar episodes of pain in past. All blood investigations were within normal limits with serum creatinine of 0.78 mg/dL. Computed Tomography (CT) Intravenous Urography (IVU) showed right ectopic kidney with Pelviureteric junction obstruction with left small atrophic kidney. Diethylenetriaminepentaacetic Acid (DTPA) reported crossed fused kidneys. Two investigations gave two different diagnoses. It made diagnosis and treatment challenging. Cystoscopy showed two ureteric orifices are normal position. Retrograde pyelogram showed left blind ureter. Right pelvic kidney was seen. Delayed drainage of contrast made diagnosis of pelvi ureteric junction obstruction. So it ruled out diagnosis of crossed fused kidneys with help of cystoscopy and retrograde pyelogram. Such anomalous kidneys are rare to find in day to day life. As anomalous kidneys usually have abnormal blood supply it makes surgery challenging. Abnormal position of kidney, malrotation makes surgery difficult. So decision was made to do open surgery for present patient. Open pyeloplasty was performed for right pelvi ureteric obstruction. Also, DTPA interpretation as anatomical investigation should be used with pinch of salt.

ABSTRACTBackground Ureteropelvic junction (UPJ) obstruction is the leading cause of pediatric hydronephrosis. While open pyeloplasty is highly effective, a small proportion of children experience recurrent ureteropelvic junction obstruction (UPJO) necessitating repeat intervention. We aimed to identify potential risk factors for pyeloplasty failure.Methods We prospectively followed 126 children undergoing open Anderson-Hynes pyeloplasty between 2019 and 2021. Demographic, clinical, anatomical, procedural, and postoperative variables were recorded. Patients were monitored for recurrence, defined as worsening hydronephrosis and/or symptoms with diuretic renogram confirmation. Univariate and multivariate analysis identified factors associated with recurrence.Results Median age at pyeloplasty was 17 months, left side was affected in 58% and 73.8% were male. At mean 28.8 months follow-up, UPJO recurred in 9 patients (7%). The only factor significantly associated with recurrence was prolonged postoperative urinary drain leakage, specifically recurrence occurred in 50% (3/6) of cases with prolonged leakage versus 5% (6/120) without (p = 0.005).Conclusions Open pediatric pyeloplasty has a high success rate, yet a minority of patients will experience recurrence necessitating re-intervention. Prolonged urine leakage was the sole predictor of failed repair in our cohort, likely due to inflammation and perianastomotic scarring. Meticulous surgical technique and prompt leak management are vital to optimize pyeloplasty outcomes. Children at higher risk warrant close monitoring to enable early detection and renal salvage.

Introduction: Renography is a non invasive technique routinely used by clinicians to provide information about kidney structure and function. However, its role in the diagnosis of renovascular disease (especially in patients with renal insufficiency), the exclusion of obstruction, and during the follow-up of patients undergoing pyeloplasty is still controversial. Aim: To study the changes in Anteroposterior Pelvic Diameter (APD), cortical thickness, split renal function and T½ post pyeloplasty at three months and to determine the usefulness of these parameters in assessing successful pyeloplasty for Pelvic Ureteric Junction Obstruction (PUJO). Materials and Methods: This prospective non randomised interventional study was conducted in the Department of Nuclear Medicine, PGIMER, Chandigarh, India and Department of Paediatrics, JIPMER, Karaikal, Puducherry, India, from July 2020 to July 2021. A total of 31 infants with persistent postnatal Hydronephrosis (HDN) on Ultrasonography (USG) with no vesicoureteral reflux were included in the study and underwent 99mTc EC renography. The diagnosis of obstruction was determined by visual interpretation, renogram curves, Time to peak (Tmax), and Time from Tmax to T½max parameters. Patients with obstructed patterns in 99mTc EC renography underwent Anderson Hyne’s dismembered pyeloplasty. After three months of surgery, 99mTc EC renography and USG were performed on all enrolled patients. The Chi-square test was used for the comparison of the difference in proportion, and the Student’s t-test was used for the comparison of the mean difference, between two groups. Results: The mean age of enrolled infants was 5.79±3.36 months with a male preponderance (27 males and 4 females). Out of 31 infants, 23 (74%) showed an obstructive pattern of drainage on diuretic renogram and underwent Anderson-Hynes dismembered pyeloplasty. The observed difference in the preoperative renal USG anteroposterior diameter (27.85±14.3 mm) and parenchymal thickness (9.6±3.3 mm) vs postoperative anteroposterior diameter (8±3.19 mm) and parenchymal thickness (15.5±4.19 mm) was statistically significant (p-value=0.001). The follow-up renogram scan conducted at three months showed a significant reduction in clearance half-time (T½). However, there was no statistically significant variation in split renal function at three months after pyeloplasty. Conclusion: Both 99mTc EC renography and USG indicate the likelihood of successful pyeloplasty, and in settings with limited resources, USG may be a viable substitute for early follow-up after pyeloplasty.

Objective·To explore the predictive value of diuretic renal scintigraphy parameters such as 20-minute residual rate (R20) for pyeloplasty in children with congenital unilateral ureteropelvic junction obstruction (UPJO).Methods·The clinical data and diuretic renal scintigraphy results of 110 children with congenital unilateral UPJO who were first treated at the Department of Nuclear Medicine, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine from August 2018 to August 2023 were retrospectively analyzed. The imaging results and the progress of hydronephrosis were followed up after the first diuretic renal scintigraphy. According to the outcome event of pyeloplasty due to the progression of hydronephrosis, the children were divided into operation group and non-operation group. Age, gender, side of hydronephrosis, and baseline diuretic renal scintigraphy parameters including blood perfusion rate (BPR), differential renal function (DRF), time to peak (Tmax), time to half (T1/2) and R20 were compared between the two groups. Logistic regression was used to analyze the effect of various parameters on the progression of hydronephrosis. The receiver operating characteristic (ROC) curve was used to analyze the predictive value of diuretic renal scintigraphy parameters for surgical intervention. Wilcoxon test was used to compare the examination parameters of two diuretic renal dynamic imaging.Results·During the follow-up, 60 children underwent pyeloplasty after progression, and the other 50 children did not progress. The differences in DRF, Tmax, T1/2 and R20 between the two groups of children at baseline were statistically significant (all P0.05).Conclusion·R20 plays an important role in the prediction of pyeloplasty in children with congenital unilateral UPJO. For children with R20≥90.08%, pyeloplasty should be performed as soon as possible to prevent further deterioration of renal function.

Mintesnot Yitagesu Kidane, Adugna Getachew Mideksa, Mubarek Bargicho Adem, Fitsum Gebreegziabher Gebrehiwot, Ramzi Yessuf Adem, Mensur Mohammed Ahmed, Abebe Ketema Aderu, Mintesnot Tadesse Berta Department of Surgery, Urology Division at St. Paul Hospital and Millennium Medical College, Addis Ababa, EthiopiaCorrespondence: Mintesnot Yitagesu Kidane; Adugna Getachew Mideksa, Email minteyit01@gmail.com; adulense@gmail.comAbstract: We report rare case of concomitant left nutcracker syndrome and right ureteropelvic junction obstruction (UPJO) on adult female patient diagnosed by CT urogram after she presented with intermittent bilateral flank pain. For this we did Anderson-Hynes pyeloplasty for right ureteropelvic obstruction, it was laparoscopic initially but due to difficulty of stenting it is changed to open. She had smooth post-op course then discharged on 3rd post-op day. Symptoms of nutcracker syndrome are not that much bothersome for the patient so we planned to follow her conservatively.Keywords: nutcracker syndrome, ureteropelvic junction obstruction, pyeloplasty, UPJO

Introduction: Ureteropelvic junction obstruction (UPJO) is a commonly encountered abnormality and it can lead to serious consequences such as renal dysplasia eventually resulting in loss of kidney. Hence, early diagnosis and timely management remains the cornerstone of the treatment. The most anticipated technique amongst modern day urologist is the robot-assisted laparoscopic pyeloplasty (RALP). The study aims to determine early post-operative outcomes of robot-assisted laparoscopic transperitoneal pyeloplasty procedure in patients presenting with unilateral ureteropelvic junction obstruction to establish the local perspective. Methodology: This is a descriptive study involving patients with ureteropelvic junction obstruction in a tertiary care facility in Karachi; Sindh Institute of Urology and Transplant (SIUT). A total of 46 participants were recruited. Robot-assisted laparoscopic transperitoneal dismembered Hynes–Anderson pyeloplasty was performed by a single surgeon with over 3 years of experience in the presence of the researcher. Early postoperative outcome total operative time, length of hospital stay, console time and blood loss were noted by the researcher as per operational definition. Data were analyzed on SPSS Version 22. Results: Mean age in our study was 46.51 years with the standard deviation of ± 10.87. Whereas, mean length of hospital stay, total operative time, total blood loss, console time, pre-hemoglobin, posthemoglobin, height, weight and BMI in our study was 1.19 ± 0.40 days, 64.58 ± 17.59 min, 9.56 ± 6.13 ml, 30.17 ± 4.99 min, 12.66 ± 1.47 ml, 11.79 ± 1.93 ml, 165.62 ± 8.23 cm, 68.34 ± 8.23 kg and 24.85 ± 3.34 kg/m2, respectively. Conclusion: Recent advancements in technology have yielded the latest RALP technique which has been proven significantly better than existing approaches and similar results are reported by this study demonstrating improvement in peri-operative and post-operative outcomes ultimately ameliorating the quality of life of patients with UPJO. [ABSTRACT FROM AUTHOR]

Purpose: We aimed to investigate the urinary caspase-3 and cytochrome c levels in patients with unilateral antenatal hydronephrosis and to determine whether changes in urinary biomarker levels could be useful for both predicting the need for surgical intervention due to ureteropelvic junction obstruction (UPJO) and postoperative surgical success. Methods: Sixty-five children with a history of unilateral antenatal hydronephrosis and postnatal anteroposterior diameter ≥ 10 mm were included in this prospective case–control study between January 2013 and December 2021. The obstruction group consisted of 33 patients (28 boys, 84.8%) who underwent open dismembered pyeloplasty due to UPJO. The non-obstructive dilatation (NOD) group consisted of 32 patients (27 boys, 84.4%) with stable or improving hydronephrosis and no significant reduction in ipsilateral split renal function during follow-up, whereas 34 healthy children were enrolled in the study as a control group. Urinary urinary caspase-3 and cytochrome c levels using ELISA were measured. Results: The median preoperative urinary caspase-3 level was significantly higher in the obstruction group when compared to the NOD group (4.82 ng/mgCr vs. 2.61 ng/mgCr, p = 0.013) as well as the control group (4.82 ng/mgCr vs. 1.72 ng/mgCr, p = 0.002). In the postoperative period, urinary caspase-3 levels significantly decreased compared to preoperative measurements (4.82 ng/mgCr vs. 2.51 ng/mgCr, p = 0.006) and became similar to the control group (2.51 ng/mgCr vs. 1.72 ng/mgCr, p = 0.422). On the other hand, no significant differences were observed in urinary cytochrome c levels between the groups. All patients who underwent pyeloplasty achieved postoperative resolution in hydronephrosis and improved drainage on MAG-3, so none of the patients required re-do pyeloplasty. Postoperative decrease in caspase-3 level was found to be compatible with adequate urine drainage on MAG-3 scan. The cut-off value of urinary caspase-3 to predict patients requiring pyeloplasty was found to be 3.31 ng/mg creatinine with 63.6% sensitivity, 62.5% specificity (AUC = 0.679). In the multivariable analysis, urinary caspase-3 level (OR: 1.653, p = 0.019), anteroposterior pelvic diameter (OR: 1.401, p = 0.001), and split renal function on MAG-3 (OR: 1.277, p = 0.011) were found to be independent factors in determining patients who require surgery. Conclusion: Based on our preliminary findings, urinary caspase-3 levels could be a useful biomarker not only for predicting the need for surgical intervention but also for determining the postoperative surgical success in children with UPJO. [ABSTRACT FROM AUTHOR]

Introduction: Pyeloplasty is the definitive management of ureteropelvic junction obstruction (UPJO). One of the challenging questions is when to perform pyeloplasty. We studied if improvement post-pyeloplasty in the first 3 months of life could show greater improvement in hydronephrosis than surgery at an older age. Patients and Methods: Patients with postnatally diagnosed UPJO and underwent pyeloplasty in the first year of life were retrospectively reviewed. We excluded patients with concomitant vesicoureteral reflux, and patients who had pyeloplasty because of UTI or missed follow-up. Patients were divided into two groups, according to the age at pyeloplasty, before and after the age of 3 months. We collected patients' demographics, anteroposterior diameter of the renal pelvis (APD), SFU grade, renogram data, perioperative data (surgery duration, hospital stay, and ureteral stent duration) and postoperative ultrasound changes. The percentage of change of APD (Δ%APD) was calculatedusing the formula: Δ%APD = [ (initial APD-last APD)/initial APD] *100. Results: We included 90 patients (93 renal units). 36 patients had pyeloplasty during the first 3 months of life and 57 patients at 3 -12 months. Patients' characteristics were similar in both groups except APD which was higher when pyeloplasty was done < 3 months of age (p = 0.02). Both groups had comparable perioperative parameters. After almost similar follow-up period of both groups. The Δ%APD was 58% when pyeloplasty was done < 3 months compared to 33% when was performed > 3 months (p = 0.009). Using Kaplan–Meier analysis, APD significantly improved when pyeloplasty was performed before the age of 3 months (p = 0.001). Conclusion: Early pyeloplasty, in the first 3 months of life, showed a significant improvement of APD postoperatively than those had surgery later. It is unclear if this will relate to less loss of renal function yet certainly this would be suspected and feel this finding provides some evidence for early intervention. [ABSTRACT FROM AUTHOR]

Objective: To investigate whether the panoramic view offered by robot-assisted laparoscopic pyeloplasty (RALP) reduces the likelihood of missing a crossing vessel compared to open pyeloplasty in cases where initial pyeloplasty fails. Methods: A single institution redo-pyeloplasty database was reviewed for children treated between January 2012 to July 2023. Clinical history, imaging and operative details were reviewed to identify the etiology for the redo procedure. Results: Cohort consisted of 45 patients undergoing a redo RALP during the study period. 29 of 45 patients had an initial open surgical approach, whereas 16 had an initial RALP. 10 patients were noted to have a missed crossing vessel on redo pyeloplasty – 9 had an initial open approach whereas 1 had an initial RALP (p<0.0001). Conclusions: RALP may reduce the risk of missing a crossing vessel due to the panoramic view of the surgical field intrinsic to an intraperitoneal RALP approach. [ABSTRACT FROM AUTHOR]

Standard protocol for post-pyeloplasty monitoring in children and natural course of hydronephrosis resolution have not been well defined. We aimed to analyze critical time intervals and risk factors in the long-term clinical outcomes of children who were operated for ureteropelvic junction obstruction. Files of patients who underwent open dismembered pyeloplasty between January 2000 and December 2012 and had a ≥10 years follow-up were retrospectively reviewed. Changes in SFU hydronephrosis grade, pelvis anteroposterior diameter (APD), renal parenchymal thickness, split renal functions (SRF) on MAG-3 scan as well as development of hypertension and proteinuria were noted. Complete resolution was defined as SFU grade 0–1 or APD≤10 mm or ≥50 % APD decrease. Overall, 223 patients (161 boys, 72.1 %) with a median age of 9 (range 1–185) months underwent unilateral pyeloplasty, whereas 14 patients (13 boys, 92.8 %) with a median age of 4 (range 2–39) months underwent bilateral pyeloplasty. Median follow-up was 13 (range 10–22) years. Complete resolution was observed in 190 patients (85.2 %). None of the cases required re-do pyeloplasty. Regarding unilateral cases, postoperative changes in hydronephrosis reached a plateau at the 60th month. Also, there was no significant difference regarding SRF between the 12th month and the 60th month (p > 0.05). Hypertension developed after a median period of 12 years in 13 (5.4 %) of the patients, while proteinuria developed in four (1.6 %) patients. Bilateral disease (HR: 2.518, p = 0.034) was found to be a significant determinant for development of hypertension and/or proteinuria. Our results indicated that ultrasonographic findings stabilized after the 60th month postoperatively, and SRF remained stable between the postoperative 12th and the 60th months. The risk of developing hypertension and/or proteinuria was 2.5 times greater in bilateral cases. Level II. What is currently known about this topic? • Dismembered pyeloplasty is the most common surgical procedure performed in ureteropelvic junction obstruction with high success rates of up to 90–98 %. • A standard protocol for post-pyeloplasty monitoring in children as well as proper definition and the natural course of hydronephrosis resolution have not been well defined. What new information is contained in this article? • Ultrasonographic findings regarding hydronephrosis stabilized after the 60th month postoperatively. • Split renal functions remained stable between the postoperative 12th and the 60th months. • The risk of developing hypertension and/or proteinuria was 2.5 times greater in bilateral cases. [ABSTRACT FROM AUTHOR]

Background: Laparoscopic ureteroplasty is an effective method for managing ureteropelvic junction obstruction. Despite its high success rate, there remains a subset of patients who do not experience improvement in the hydrops. Methods: The study retrospectively analyzed the data of 143 patients with ureteropelvic junction obstruction (UPJO) who underwent laparoscopic pyeloplasty (LP) in our hospital from January 2015 to May 2022. Logistic regression was used to analyze the risk factors of recurrence stenosis after UPJO. Results: Out of these patients, 119 had complete clinical data and follow-up records. Among these patients, restenosis occurred in nine cases after the operation. There was a significant statistical difference in blood loss (P < 0.05). Univariate and multivariate logistic regression analysis revealed that the preoperative separation degree of the renal pelvis, cystatin C, and intraoperative blood loss were potential risk factors for recurrent stenosis after primary LP. When divided by split renal function (SRF), the odds ratio (OR) was 7.850 (P = 0.044), indicating that it was an independent risk factor for postoperative restenosis. Similarly, the OR for stenotic segment length was 0.025 (P = 0.011), also indicating it as an independent risk factor for restenosis. The areas under the receiver operating characteristic curve for stenotic segment length and SRF were 0.9056 and 0.7697, respectively. Conclusion: In our study, we identified that preoperative renal pelvis separation, cystatin C, and intraoperative blood loss were potential risk factors for postoperative restenosis. SRF and stenosis segment length were independent risk factors for postoperative restenosis. [ABSTRACT FROM AUTHOR]

The kidney is frequently injured in blunt abdominal trauma, accounting for 10 % of such cases and being the most commonly affected genitourinary organ in all traumas. Pelviureteric junction obstruction (PUJO) is typically a congenital and asymptomatic anatomical dilatation to the renal pelvis. This article reports on a 21-year-old male who ruptured a congenital PUJO following blunt abdominal trauma. He was managed with a retrograde ureteric stent and a staged pyeloplasty. This case highlights a rare case of urogenital injury due to blunt trauma and explores the impact of congenital anomalies can contribute to injury and lead to significant complications.

Fibroepithelial polyps (FEP) are rare benign tumors urinary collecting system. Diagnosis is suspected on Computed Tomography (CT) and confirmed via histopathology. Treatment options vary from historic nephroureterectomy to more contemporary methods of ablation. Authors present a case of a symptomatic FEP causing left-sided hydronephrosis and episodic flank pain treated by a urologic surgeon. The patient underwent robotic pyeloplasty and excision of the tumors, yielding preserved renal function and resolution of the hydronephrosis.

Purpose: The purpose was to study the correlation between age at surgery and functional recovery after infant pyeloplasty. Materials and Methods: All infants who underwent pyeloplasty were analyzed retrospectively in this multicenter study. Anteroposterior diameter (APD) >2 cm, split renal function (SRF)

Background/Objective: Differentiation of uretero-pelvic junction obstruction (UPJO) from non-obstructive dilatation (NOD) is a major challenge. The aim of this retrospective study is to determine whether pyeloplasty prediction score (PPS) could predict the need for surgery and resolution after surgery. Methods: Among patients with antenatally diagnosed hydronephrosis, those who were stable during post-natal follow-up were considered NOD. The UPJO group were the ones who worsened and underwent pyeloplasty based on conventional indications. All patients with UPJO underwent laparoscopic dismembered pyeloplasty. PPS was determined based on three ultrasound parameters obtained retrospectively: Society of Fetal Urology (SFU) grade of hydronephrosis, transverse anteroposterior (APD), and the absolute percentage difference of ipsilateral and contralateral renal lengths. Results: Among 137 patients included (R:L = 59:73; M:F 102:35), 96 were conservatively managed (NOD), while 41 patients (29%) needed pyeloplasty (UPJO). Mean PPS was 4.2 (1.2) in the NOD group and it was significantly higher at 10.8 (1.63) in the UPJO group (p = 0.001). All patients with PPS > 8 needed a pyeloplasty, while two patients with PPS of 7 needed pyeloplasty due to drop in renal function. PPS cutoff value of >8 had a sensitivity 95%, specificity 100% and a likelihood ratio of 20. Post-pyeloplasty PPS resolution was proportional to the duration of follow-up. Conclusions: A PPS cutoff value of 8 or above is associated with the presence of significant UPJO. PPS is also useful in the assessment of hydronephrosis recovery post-pyeloplasty. The limitation of PPS: it can only be applied in the presence of contralateral normal kidney. [ABSTRACT FROM AUTHOR]

Introduction: We present our initial experience with robot-assisted reconstructive surgeries with the Da Vinci Xi robotic system for benign ureteric pathologies. Materials and methods: This is a retrospective review of prospectively collected data of patients who underwent robot-assisted reconstructive procedures for benign diseases of the ureter at our department from April 2018 to November 2022. Demographic and perioperative details were recorded. Patients were followed up and surgical success was evaluated on the basis of symptomatic, functional, and radiological improvement. Results: A total of 34 patients underwent robot-assisted reconstructions for benign ureteric pathologies by various techniques. Mean age, body mass index (BMI), hospital stay and follow-up duration were 36 years, 24.1 kg/m2, 5.29 days, and 7.08 months respectively. Procedures included pyeloplasty in eight, primary ureteroneocystostomy (UNC) in seven, Psoas hitch UNC in five, Boari flap UNC in six, Ureteroureterostomy in four, ureterocalicostomy in two and ileal ureteral transposition in two patients. Mean docking time, total operative time, and estimated blood loss were 31.5 min, 178 min, and 64.3 ml, respectively. All patients had radiologic or functional improvement on follow-up after 6 months. Conclusion: Robot-assisted reconstructive surgery for benign ureteric and bladder pathologies imparted excellent short-term outcomes without major complications with all the advantages of a minimally invasive approach. [ABSTRACT FROM AUTHOR]

Background and Aims: Quadratus lumborum block (QLB) is a compartmental block of the anterior abdominal wall. Surgical trauma produces neuroendocrine surgical stress responses, which are modified by anaesthetic blocks. The aim of this study was to evaluate the effect of ultrasound (US)‑guided QLB on analgesia and surgical neuroendocrine stress response in paediatric patients undergoing pyeloplasty. Methods: A randomised trial was conducted in 60 children aged 1–7 years undergoing elective open pyeloplasty. Patients were randomised into Group QLB [US‑guided QLB with 0.5 ml/kg of 0.25% ropivacaine after induction of general anaesthesia (GA)], and Group GA, which received only GA. Perioperative haemodynamic parameters, serum cortisol, blood glucose, analgesic consumption and postoperative FLACC scores were recorded. Unpaired t‑test, Wilcoxon rank‑sum test or Mann–Whitney U test was used to compare variables between the two groups. Two‑way analysis of variance or the Friedmann test was used to compare quantitative variables at various points within a group. Results: A decrease in serum cortisol and blood glucose values was observed in Group QLB at 30 min after surgical incision and 24 h after surgery compared to the preoperative value and compared to Group GA (P < 0.05). The quality of analgesia assessed by the FLACC scale was significantly better in group QLB. Dose of fentanyl consumption (µg/kg) was higher in Group GA compared to Group QLB in the intraoperative and postoperative period (P < 0.05). Conclusion: QLB is effective as part of multimodal analgesia and attenuates the neuroendocrine stress in paediatric patients undergoing open pyeloplasty. [ABSTRACT FROM AUTHOR]

Purpose: The purpose was to study the correlation between age at surgery and functional recovery after infant pyeloplasty. Materials and Methods: All infants who underwent pyeloplasty were analyzed retrospectively in this multicenter study. Anteroposterior diameter (APD) >2 cm, split renal function (SRF) <40%, and Society of Fetal Urology (SFu) grade 3-4 were surgical indications. Based on the age at pyeloplasty, they were divided into Group 1 (1-3 months) and Group 2 (4-12 months). APD and SRF were compared before and after surgery in both groups. The fractional recoverable function (post-SRF-pre-SRF)/(50-pre-SRF) ><100 was correlated with age. Results: Fifty-one infants underwent pyeloplasty (mean age: 1.6 months - Group 1 and 7.2 months - Group 2). The mean APD decreased from 3 cm to 1.2 cm in Group 1 while 2.8 cm to 2 cm in Group 2 (P = 0.001). The mean SRF increased from 32.28% to 42.81% in Group 1 while 31%-34.18% in Group 2. SRF recovery was significantly higher in Group 1 compared to Group 2 (P = 0.001). Regression analysis showed a weak negative correlation (r = -0.2792) between age at surgery and renal function improvement. Conclusion: Functional recovery after pyeloplasty is better when done earlier (1-3 months), as this gives the growing kidney the best opportunity to recover. [ABSTRACT FROM AUTHOR]

Introduction: Robotic-assisted surgery (RAS) is an increasingly utilized tool in children. However, utilization of RAS among infants and small children has not been well established. The purpose of this study was to review and characterize RAS procedures for children ≤15 kg. Methods: We performed a single institution retrospective descriptive analysis including all patients ≤15 kg undergoing RAS between January 2013 and July 2021. Data collection included procedure type, age, weight, gender, and surgical complications. Cases were further categorized according to surgical specialty: pediatric urology (PU), pediatric surgery (PS), and multiple specialties (MS). t-Tests were used for statistical analyses. Results: Since 2013, a total of 976 RAS were identified: 492 (50.4%) were performed by PU, 466 (47.8%) by PS, and 18 (1.8%) by MS. One hundred eighteen (12.1%) were performed on children ≤15 kg, consisting of 110 (93.2%) PU cases, 6 (5.1%) PS cases, and 2 (1.7%) MS cases. Procedures were significantly more common in the PU subgroup, mean of 12 cases/year, compared to PS subgroup, mean of 0.63 cases/year, (P < .01). The mean weight of PU patients (10.5 kg) was significantly less than PS patients (13.9 kg) (P < .01). Mean age was also significantly lower among PU patients (18.6 months) compared to PS (34.2 months) (P < .01). Conclusion: RAS among patients ≤15 kg is safe and feasible across pediatric surgical subspecialties. RAS was performed significantly more frequently by pediatric urologists in younger and smaller patients compared to pediatric surgeons. Further refinement of robotic technology and instrumentation should enhance the applicability of these procedures in this young group. [ABSTRACT FROM AUTHOR]

Introduction: Etiopathogenesis and the symptomatology of ureteropelvic junction obstruction (UPJO) in the pediatric population has not yet been definitely clarified, suggesting a multifactorial nature of the condition. The aim was to analyze the association between the number of Interstitial Cells of Cajal (ICCs), as well as P2X3 receptors in ureteropelvic junction (UPJ) and the pain response in pediatric patients with hydronephrosis. Methods: 50 patients with congenital hydronephrosis underwent open or laparoscopic pyeloplasty at one of two departments of pediatric surgery and urology in Poland. Patients were divided into two groups according to the pain symptoms before surgery. A total of 50 samples of UPJ were obtained intraoperatively and underwent histopathological and immunohistochemical (IHC) analysis. Quantitative assessment of ICCs was based on the number of CD117(+) cells of adequate morphology in the subepithelial layer and the muscularis propria. Expression of P2X3 receptors was evaluated as the intensity of IHC staining. Results: Patients with hydronephrosis and accompanying pain were on average 60 months older (77 vs. 17 months) than children with asymptomatic hydronephrosis (p = 0.017). Symptomatic children revealed higher numbers of ICCs in both the subepithelial layer and in the lamina muscularis propria. In particular, symptomatic patients aged 2 years or more exhibited significantly higher numbers of ICCs in the subepithelial layer. Significant differences in the distribution of ICCs between the subepithelial layer and the lamina muscularis propria were observed in both groups. Expression of P2X3 receptors was limited to the urothelium and the muscle layer and correlated between these structures. There was no relationship between pain response and the expression of P2X3 receptors. Conclusions: ICCs and P2X3 receptors may participate in the pathogenesis of UPJO and in the modulation of pain response to a dilatation of the pyelocaliceal system. Explanation of the role of ICCs and P2X3 receptors in propagation of ureteral peristaltic wave and the modulation of pain stimuli requires further studies. [ABSTRACT FROM AUTHOR]

Objective To explore the risk factors of unplanned reoperation (UR) after laparoscopic pyeloplasty (LP) in children with ureteropelvic junction obstruction (UPJO) and examine the clinical characteristics of UR children. Methods From March 2010 to December 2023, the relevant clinical data were retrospectively reviewed for 678 children of unilateral UPJO undergoing LP. Children undergoing UR after LP were selected as study group and those without UR as control group. Gender, age, history of nephrostomy, Society of Fetal Urology (SFU) grade, surgical proficiency and postoperative hospitalization stay of two groups were collected for univariate and multivariate Logistic regression analyses. Statistical analysis was performed with SPSS version 26.0 software package. Results Among them, 19(2.8%) cases underwent UR. According to the timing of reoperation, it was assigned into short-term and long-term URs. Four children (4/678, 0.6%) underwent short-term UR for uroabdomen and allantois due to anastomotic leakage, varying degrees of intestinal obstruction and abdominal infection. Long-term UR was performed in 15 children (15/678, 2.2%) for recurrent UPJO, aggravation of hydronephrosis, recurrent abdominal pain, urinary tract infection and hematuria. According to univariate analysis, anteroposterior diameter (APD), postoperative hospitalization stay, surgical proficiency, preoperative severity of hydronephrosis and presence of percutaneous nephrostomy were associated with UR ( P<0.05). Based upon multivariable analysis, APD ( OR=1.278, 95% CI: 1.069-1.528), postoperative hospitalization stay ( OR=1.165, 95% CI: 1.094-1.239), surgical proficiency ( OR=1.165, 95% CI: 1.094-1.239) and presence of percutaneous nephrostomy ( OR=17.817, 95% CI: 3.291-96.446) were the strongest predictors of UR ( P<0.05). Conclusions APD, postoperative hospitalization stay, surgical proficiency and presence of percutaneous nephrostomy are correlated with UR. Timely renal ultrasonography, evaluation of renal function, accurate intraoperative handling and a lowered risk of complications are vital for preventing and minimizing UR. [ABSTRACT FROM AUTHOR]

Objective To explore the clinical features and outcomes of massive urinary extravasation after pyeloplasty in children. Methods From January 2016 to December 2023, the relevant clinical data were retrospectively reviewed for 18 children with massive urinary extravasation after pyeloplasty. Demographic profiles, medical history, perioperative images, urinary extravasation during hospitalization, and treatment outcomes were recorded. Results There were 16 boys and 2 girls with an operative age of (6.03±4.79) year. Obstruction was located at left ( n=16) and right ( n=2). Length of hospitalization stay was 20 (13-24) day and median duration of massive postoperative urinary extravasation 2(1-20) day. In 17/18 children, abdominal drainage tube was retained for a median duration of 11(8-15) day. The highest volume of abdominal drainage fluid withinin a single day was 485(298-786) ml. Clavien-Dindo grade of postoperative complications was Ⅰ ( n=8), Ⅱ ( n=4) and Ⅲb ( n=6).The frequency of reoperation during hospitalization was 33.33%(6/18). The perioperative APD were (4.11±1.83) and 2.40(1.58, 4.53) cm with statistically significant difference ( Z=-2.628, P=0.009). Perioperative PTmin was 0.6(0.2, 0.8) and (0.93±0.32) cm with statistically significant difference ( Z=-2.580, P=0.011). Perioperative ratio of APD/PT was 6.05(2.85-13.44) and 2.64(1.95-5.73) with statistically significant difference ( Z=-2.940, P=0.002). Postoperative values of APD, PTmin, and APD/PT significantly improved as compared preoperatively. PI-APD was 20.95%(-0.45%, 60.91%). There were two cases of postoperative re-obstruction. Overall success rate of operation was 88.89%(16/18). Conclusions Severe urinary extravasation after pyeloplasty may result in an extended duration of hospitalization and an elevated probability of reoperation. However, the occurrence of re-obstruction after pyeloplasty with massive urine extravasation remains low. [ABSTRACT FROM AUTHOR]

Aims: Retroperitoneoscopic simple nondismembered pyeloplasty (SNDP) with da Vinci Si assistance was developed because of a possible risk for alignment shift after retroperitoneoscopic diamond-shaped bypass pyeloplasty (Diamond-Bypass; DP). Outcomes of SNDP and DP were compared. Materials and Methods: For SNDP, a small longitudinal incision is made on the border of the dilated pelvis and narrowed ureter at the ureteropelvic junction (UPJ). Extending this incision toward the pelvis allows identification of mucosa while maintaining the integrity of surrounding tissues that are so thin and fragile that they will not influence lumen alignment. Data for DP were obtained from a previously published article. Results: For SNDP (n = 3), mean age at surgery was 2.67 years (range: 1–4), mean operative time was 176 minutes. Mean postoperative Society of Fetal Urology (SFU) grades for hydronephrosis were 1.2, 0.7, and 0.6, 1, 2, and 3 months after stent removal, respectively. Postoperative diethylenetriaminepentaacetic acid (DTPA) was normal (n = 3). For DP (n = 5) mean age at surgery was 4.3 years (range: 1–14), mean operative time was 189 minutes. Mean postoperative SFU grades were 2.8, 2.2, and 1.6, respectively. Postoperative DTPA was normal (n = 4) and delayed (n = 1). All SNDP and DP were asymptomatic by 3 months after stent removal. Conclusion: Both SNDP and DP have favorable outcomes. If the UPJ is located at the lowest end of the renal pelvis, SNDP may improve hydronephrosis more quickly. [ABSTRACT FROM AUTHOR]

Introduction: In children, the association of ipsilateral pyeloureteral junction obstruction (PUJO) and ureterovesical junction obstruction (UVJO) is a rare malformation with a non-standardized treatment. We report a case of PUJO and UVJO treated by a combined minimally invasive surgical treatment to resolve the double urinary obstruction. The current literature was also reviewed. Case report and review: A two-month-old boy, without antenatal and postnatal signs of urinary tract anomalies, was hospitalized presenting right hydronephrosis, perirenal fluid effusion, and ascites. An acute pelvic rupture was suspected, and a retrograde pyelogram was performed, showing a primary obstructive megaureter (POM) associated with a corkscrew pyeloureteral junction. The impossibility to place a double J catheter through the pyeloureteral junction led us to achieve percutaneous nephrostomy and an abdominal drain placement. Three months later, the patient underwent a combined high-pressure balloon ureterovesical junction dilation and retroperitoneoscopic Anderson Hynes one-trocar-assisted pyeloplasty (OTAP). The literature search identified 110 children experiencing double urinary tract obstruction. All authors agreed on the difficulty to diagnose both obstructions preoperatively, but there is still no consensus on which obstruction should be relieved earlier, because the alteration in urinary vascularity during a double surgery could damage the ureter. Conclusions: The simultaneous occurrence of UPJO and UVJO is rare, with a challenging diagnosis. Prompt identification and timely surgical intervention are crucial to mitigate the risk of renal function loss attributable to obstruction and infection. Drawing from our expertise and the analysis of the existing literature, we propose employing a simultaneous double minimally invasive strategy in order to optimize the preservation of ureteral vascularity. This approach entails performing a minimally invasive pyeloplasty for the PUJ and utilizing high-pressure balloon dilatation for the UVJ. [ABSTRACT FROM AUTHOR]

Purpose: To determine if children with UPJO demonstrate a clinically significant change in somatic growth following pyeloplasty. Methods: We retrospectively evaluated the growth chart data of infants with SFU grade 3 or 4 congenital hydronephrosis at our institution from 2015 to 2022. Of those, 35 patients underwent pyeloplasty and 66 had no surgical intervention. Patients met criteria if they had SFU 3 or 4 hydronephrosis and MAG3 renal scan. If patients underwent surgery, height and weight percentiles were recorded from the pre-op and 6–16-month follow-up visits. In non-surgery patients, measurements were taken near the median age of surgery in the intervention group and 6–16 months later. Interval changes in group height and weight percentiles are compared for significant changes. Results: The surgery and non-surgery groups did not differ in terms of gender (71% vs 74% Male), starting age (296 vs 244 days), starting weight (58th vs 52nd percentile), or time between measurements (255 vs 260 days), though the surgery group had significantly less height in the pre-operative period (43rd vs 55th percentile, p = 0.050) and were more likely to have delayed drainage on renal scan (83% w/delay vs 35%). The surgery group showed a significant increase in height (18.9 percentiles; 95% CI 11–27) and weight (6.0 percentiles; 95% CI 0.50–12) after intervention. Conclusions: Patients with congenital hydronephrosis due to UPJO that underwent pyeloplasty showed a significant increase in weight and height at 6–16 months postoperatively compared to those that were managed with close observation. This suggests UPJO might lead to growth delay in infants. [ABSTRACT FROM AUTHOR]

Context: Pelvic-ureteric junction obstruction (PUJO) causes urine stasis in the renal pelvis and progressive kidney damage. Postpyeloplasty improvement of renal function and urinary drainage is assessed by diuretic isotope renogram and ultrasonography. Renograms are expensive and have radiation exposure. This study explores whether ultrasound parameters such as percentage improvement in anteroposterior pelvic diameter (PI-APD) is a valuable markers for successful pediatric pyeloplasties. Aims: The aim of this study was to identify patients who would benefit from ultrasound monitoring of PI-APD alone instead of diuretic isotope renal scan for postoperative follow-up of pyeloplasty. Settings and Design: This was a retrospective descriptive study. Subjects and Methods: We analyzed 127 pediatric pyeloplasties performed and under follow-up between June 2016 and May 2021. We recorded the postoperative ultrasound and isotope renogram parameters. PI-APD (preoperative AP diameter -- postoperative AP diameter)/preoperative AP diameter x 100) was compared with improvement in renogram parameters (differential renal function, Tmax, curve pattern, and retention) to look for a correlation between them. Statistical Analysis Used: SPSS version 20.5, Chi-square and paired t-test were used for statistical analysis. Results: About 73.2% of patients were males, with most cases detected antenatally (76.4%). The majority was left-sided PUJO (67.7%). The mean age at surgery was 30.8 months. We identified a statistically significant correlation between the ultrasound parameter PI-APD and the renogram parameter Tmax. There is no significant correlation between PI-APD and other renogram parameters. Conclusions: In patients whose ultrasound parameter PI-APD is >40% and renal parenchymal thickness has increased, isotope renograms can be avoided for follow-up of postpyeloplasty patients. [ABSTRACT FROM AUTHOR]

Chronic unilateral renal obstruction, primarily caused by ureteropelvic junction obstruction (UPJO), poses challenges in determining the optimal timing for corrective surgery. The goal is to preserve renal function and alleviate symptoms, but there is no definitive diagnostic test to reliably predict the outcomes of surgery. This systematic review aimed to identify predictors for renal function recovery after pyeloplasty in order to guide effective treatment options. We conducted a systematic review following the Preferred Reporting Items for Systematic Reviews and Meta-Analysis guidelines. A literature search was performed on PubMed, Embase, and Scopus using keywords related to renal function, pyeloplasty, and predictors. The search was conducted on March 10, 2022. The quality of the included studies was assessed using the Newcastle-Ottawa Scale. Out of 344 potentially relevant articles, 11 met the eligibility criteria for this study. These included 6 retrospective and 5 prospective studies, with a total of 925 participants. Most studies evaluated renal function using differential renal function (DRF). The overall quality of the included studies was considered average. The findings indicated that age at the time of surgery and gender did not significantly influence functional recovery after pyeloplasty. However, preoperative DRF consistently emerged as a critical predictor. Preoperative DRF can serve as the most common predictors used for renal function recovery following pyeloplasty. These findings contribute to understanding effective treatment options for chronic unilateral renal obstruction. However, further research for each predictor is needed to validate these predictors and their clinical utility. [ABSTRACT FROM AUTHOR]

Objective: To deliver a case report showing that robotic pyeloplasty in a patient with a horseshoe kidney is not only successful but also potentially superior to laparoscopic surgery. To the best of our knowledge, this is the first case report of its kind in the United Kingdom. Method: PubMed was used to do a literature search. We have excluded papers that were written in foreign languages, or were paediatric case studies. Results: Horseshoe kidneys are the commonest congenital abnormality of the renal and are often associated with pelvic-ureteric junction obstruction (PUJO) – in the order of 30%. Minimally invasive surgery is the gold standard for management of PUJO. With the advancement of the Da Vinci robot, this case report presents a patient undergoing pyeloplasty in a horseshoe kidney with PUJO on the left side, using a robotic technique. We performed a robotic pyeloplasty on a 32-year-old woman, with a horseshoe kidney. We felt this is a case worth discussion, giving the alteration in the surgical technique in conjunction with the anatomical abnormalities, and the lack of similar reported cases in the literature. We propose that in some cases, the robotic operative technique is superior to standard laparoscopic technique. Although there is an increased cost when using the Da Vinci robot, this may be offset by the 3D visualisation, enhanced dexterity, tremor filtering and movement scaling, increased range of motion, as well as the reduction of operative time, hospital stay, blood loss, complications, and indeed patient satisfaction. In addition to the benefits of robotic surgery itself, we demonstrate that robotic surgery in this particular case was preferable to other techniques, given the anatomical exclusivity of a horseshoe kidney. Conclusion: We propose that in some cases, the robotic operative technique is superior to other minimal access techniques in urological surgery. Level of Evidence: 4 [ABSTRACT FROM AUTHOR]

Background and Aims: Quadratus lumborum block (QLB) is a compartmental block of the anterior abdominal wall. Surgical trauma produces neuroendocrine surgical stress responses, which are modified by anaesthetic blocks. The aim of this study was to evaluate the effect of ultrasound (US)-guided QLB on analgesia and surgical neuroendocrine stress response in paediatric patients undergoing pyeloplasty. Methods: A randomised trial was conducted in 60 children aged 1–7 years undergoing elective open pyeloplasty. Patients were randomised into Group QLB [US-guided QLB with 0.5 ml/kg of 0.25% ropivacaine after induction of general anaesthesia (GA)], and Group GA, which received only GA. Perioperative haemodynamic parameters, serum cortisol, blood glucose, analgesic consumption and postoperative FLACC scores were recorded. Unpaired t-test, Wilcoxon rank-sum test or Mann–Whitney U test was used to compare variables between the two groups. Two-way analysis of variance or the Friedmann test was used to compare quantitative variables at various points within a group. Results: A decrease in serum cortisol and blood glucose values was observed in Group QLB at 30 min after surgical incision and 24 h after surgery compared to the preoperative value and compared to Group GA (P < 0.05). The quality of analgesia assessed by the FLACC scale was significantly better in group QLB. Dose of fentanyl consumption (μg/kg) was higher in Group GA compared to Group QLB in the intraoperative and postoperative period (P < 0.05). Conclusion: QLB is effective as part of multimodal analgesia and attenuates the neuroendocrine stress in paediatric patients undergoing open pyeloplasty.

Context: Minimally invasive management (laparoscopic/robot assisted) is currently the standard of care for managing pelvi ureteric junction obstruction (PUJO). Open techniques of management of PUJO are well described in literature. However, there appears to be relative lack of description of minimally invasive techniques in the literature. Objective: This article is aimed at describing in detail, with images, the various techniques and modifications in laparoscopic or robot-assisted management of PUJO. Evidence Acquisition: A review of literature on PubMed was performed and all articles which detailed any technique of minimally invasive pyeloplasty were included. Evidence Synthesis: The various techniques of minimally invasive pyeloplasty as well as the authors' techniques are compiled and described in detail with intraoperative images. Conclusions: Operative techniques of minimally invasive pyeloplasty are not well described in literature. We have attempted to present a comprehensive resource of different techniques of minimally invasive pyeloplasty and the clinical scenarios in which they may be appropriate. This should prove to be a useful reference to the practicing urologist. Patient Summary: In this paper, we have compiled the various surgical techniques of treating obstruction at the PUJ of the kidney along with intraoperative photograph.

Background: Ureteropelvic junction obstruction (UPJO) is the most common cause of antenatal hydronephrosis. The incidence is around 1: 750-1500 live births. The standard treatment for (UPJO) is open pyeloplasty (OP) with a high success rate of 90%-95%. In the last 20 years, minimal invasive pyeloplasty (MIP) became an excellent alternative technique to OP which was historically the standard of care. Materials and Methods: The study participants were male and female patients aged 14 years old or less who had undergone open/minimally invasive pyeloplasty during 2015-2020 and who had at least 1-year follow-up after surgery. The data were collected retrospectively from patients' charts. The patients were categorized into two cohort groups: OP and on the other arm minimally invasive pyeloplasty (robotic/laparoscopic) comparing the outcomes as a 1ry endpoint. 2ry endpoints were hospital stay, duration of surgery, and anteroposterior diameter of renal ultrasound. Results: A total of 133 patients were included in the study. Eighty-four underwent MIP while 49 patients underwent OP. 1ry endpoint was the success rate in both groups. The success rate was 94% (n: 79) and 98% (n: 48) in patients who underwent MIP and OP, respectively. P <0.05 is considered significant. Conclusion: Open and minimally invasive pyeloplasty are comparable in terms of success rate. However, OP was associated with shorter hospital stays and shorter operative times. [ABSTRACT FROM AUTHOR]

Introduction. Pediatric pyeloplasty ensures a successful outcome in 83 – 97% cases. However, current lack of consensus regarding the definition of "success" related to results of pyeloplasty prevents development of a generally accepted standardised approach to postoperative care management. Objective. To study the dynamics in regression of renal collecting system (RCS) dilatation in patients with urteropelvic junction obstruction (UPJO) following pyeloplasty. Materials & methods. We have investigated dynamics in regression of RCS dilatation in UPJO-patients following pyeloplasty. An intrinsic UPJO cause was established in 55 (80%) patients, an extrinsic factor (crossing vessel) — in 14 (20%) cases. The patients underwent surgery involving laparoscopic access, no reducing resection of the renal pelvis was performed. In the pre- and postoperative periods, renal ultrasonography was carried out in the prone position without volemic load and with an empty bladder. Pelvic anterior-posterior diameter measured in the sagittal plane were then compared. In all cases, external RCS drainage technique was employed until restoration of urodynamics in the upper urinary tract according to the pyelomanometry data.Results. In 3 months following pyeloplasty, a regression is noted in the RCS dilatation by 40%, after 6 months — by 53%, after 12 months –— by 64% of the initial value. In patients with intrinsic UPJO causes, after 3 months following pyeloplasty a regression is noted in the RCS dilatation by 34%, after 6 months –— by 42%, after 12 months — by 61% of the initial value; in patients with extrinsic PUJO factors, after 3 months the regression noted in RCS dilatation is 49%, after 6 months — 56%, after 12 months — 86%. Conclusion. Pre- and postoperative renal ultrasound in PUJO cases should be performed in the prone position without volemic load and with an empty bladder. In patients with confirmed restoration of UPJ patency after 12 months following surgery, a decrease in the RCS dilatation by 61% is noted among the patients with intrinsic PUJO causes and by 86% from pre-surgery values in children with extrinsic UPJO factors.

Objective: This study aimed to determine the efficacy and long-term outcomes of pyeloplasty in children with poorly functioning kidneys. Materials and Methods: Twenty-six patient charts were reviewed who underwent pyeloplasty with poorly functioning kidneys from 2008 to 2020. Patients were divided into two groups based on DRF; Group 1: 0-10%, and Group 2: between 10-30%. Patient demographics, preoperative and postoperative anteroposterior diameter (APD), parenchymal renal thickness (PT) ratio, and differential renal function (DF) were analyzed to confirm the postoperative benefits and potential predictors of renal functional recoverability. The parameters of patients younger than one year of age were also compared to those of older patients. Results: The renal function of 12 of 26 patients’ was 0.0001). The postoperative PT ratio and postoperative DF were increased in Group II, but not in Group I. DF and PT ratios also improved in Group II in patients younger than 1 year of age (p=0.014, p=0.032 respectively). Hypertension was detected in 5 patients (41.6%) during follow-up in Group I. Conclusion: Pyeloplasty is recommended considering parenchymal and DF recovery in patients younger than 1 year of age with a DF of 10-30%. However, in patients with

Ectopic kidneys, with a prevalence of 1/1000-4000, often manifest in the pelvic region, can be complicated with problems such as ureteropelvic junction (UPJ) obstruction. This video article presents a case of open pyeloplasty in a 15-month-old infant with a pelvic kidney, emphasizing technical details for educational purposes. The patient was prenatally diagnosed with pelvic kidney hydronephrosis at 22 weeks of gestation, progressing to grade 4 postnatally. MAG-3 scintigraphy confirmed UPJ obstruction, warranting open pyeloplasty. A Pfannenstiel incision provided access to the Retzius space. The ureter was dissected, revealing the adhered renal pelvis. Stay sutures facilitated dissection, and 5/0 polyglactin sutures were strategically placed due to anatomical anomalies. Ureteropelvic anastomosis was performed using 6/0 PDS sutures. A 3-Fr Double J catheter preceded the closure of the renal pelvis. The procedure was concluded with meticulous layer closure. The operation lasted for 50 min, with minimal blood loss (10 mL). Drain was removed on postoperative day 2, and the patient was discharged. Ureteral stent was removed at 4 weeks. A 3-month follow-up ultrasound revealed a notable reduction in hydronephrosis, with an anteroposterior diameter of 6 mm. This video article elucidates the nuances of open pyeloplasty in pelvic kidneys and serves as a valuable resource for residents and fellows. The concise procedure, with a brief operative time and minimal blood loss, indicates the efficacy of the surgery.

Objective: We aimed to identify clinical and radiological predictors of the need for surgical intervention in infants with antenatally detected UPJO. Material and methods: We prospectively followed infants born with antenatally diagnosed ureteropelvic junction obstruction (UPJO) presented at our outpatient clinics for evidence of obstructive injury with a standard protocol with ultrasonography and renal scintigraphy. Indications for surgery included progression of hydronephrosis on serial examinations, initial differential renal function (DFR) ⩽35% or >5% loss in sequential studies, and febrile urinary tract infection (UTI). Univariate and multivariate analyses were utilized to define the predictors for surgical intervention, while the appropriate cut-off value of the initial Anteroposterior diameter (APD) was determined using the receiver operator curve analysis. Results: Univariate analysis revealed a significant association between surgery, the initial APD, cortical thickness, Society for Fetal Urology grade, UTD risk group, initial DRF, and febrile UTI (p -value < 0.05). No significant association between surgery and sex or side of the affected kidney (p -value 0.91 and 0.38, respectively). On multivariate analysis, the initial APD, initial DRF, obstructed renographic curve, and febrile UTI (p -value < 0.05) were the only independent predictors for surgical intervention. An initial APD of 23 mm can predict surgical requirement, with a specificity of 95% and sensitivity of 70%. Conclusion: For antenatally diagnosed UPJO, the APD value (at the age of 1 week), DFR value (at the age of 6–8 weeks), and febrile UTI during follow-up are significant and independent predictors of the need for surgical intervention. APD, when used with a cut-off value of 23 mm, is associated with high specificity and sensitivity for predicting surgical need. [ABSTRACT FROM AUTHOR]

Purpose: Spatulation during ureteropelvic junction obstruction repair was evaluated in children treated by robot-assisted retroperitoneal pyeloplasty anastomosis (RRPA). Methods: Intraoperative video recordings (IVRs) of RRPA (n = 22 ureters) performed at a single institute between 2018 and 2022 were reviewed blindly by 5 independent surgeons for perceived difficulty of suturing (DOS; 5 = impossible; 4 = difficult; 3 = tedious; 2 = slow; 1 = easy) and spatulation ranking as superior (+1), inferior (−1), or unnecessary (0). The retroperitoneal space was accessed in the lateral decubitus position using a closed technique under direct vision to avoid air leakage and subcutaneous emphysema. All subjects had a Double-J stent (4.7F) placed. Results: Subjects had similar demographics and preoperative ureter diameters. IVRs were RRPA with spatulation of the ureter on the lateral side (RRPA +SP) (n = 13) and RRPA without spatulation of the ureter (RRPA −SP) (n = 9). Overall DOS scores and coefficients of variation for time taken to place one suture were similar. Total anastomotic time was significantly shorter for RRPA −SP; 67.9 ± 8.4 minutes versus 57.9 ± 9.2 minutes, P = .01. Overall spatulation ranking was 0. Postoperative scanning showed improved drainage in 12 of 13 (92%) in RRPA +SP and 8 of 9 (88%) in RRPA −SP; differences were not significant. One anastomotic stricture in RRPA −SP required open repair. Conclusions: RRPA was quicker and more precise without spatulation. Outcomes of scanning 1 year after RRPA were similar for RRPA −SP and RRPA +SP. [ABSTRACT FROM AUTHOR]

Little is known about the effects of CO2 insufflation (CDI) on cerebral oxygen saturation (CrSO2) during laparoscopy in the pediatric population. In children undergoing robotic-assisted laparoscopic pyeloplasty (RALP), we prospectively assessed the effects of CDI using standard monitoring and cerebral near-infrared spectroscopy (NIRS). We also explored whether a correlation existed between CrSO2 and parameters known to affect cerebral blood flow. Between January 2021 and September 2023, a cohort of consecutive children older than 2 years underwent RALP at Necker-Enfants Malades Hospital in Paris. A ventilation protocol aimed to prevent hypercarbia was implemented. Data collected included standard monitoring parameters and CrSO2 by NIRS. Thirty patients (16 females), mean age 5.5 ± 3.9 (2.0–9.5) years, were included. Twenty-three patients underwent a retroperitoneal approach. The mean baseline CrSO2 value was 83.0 ± 9.8. Mean CrSO2 decreased during progressive CDI, never below baseline values, while standard-monitoring parameters did not significantly change. No significant correlation was detected between CrSO2 and end tidal CO2, or between CrSO2 and mean arterial pressure, at any operative time. During RALP, a gradual CDI doesn’t cause pathological derangements of CrSO2. The lack of correlation between CrSO2 and standard parameters affecting cerebral blood flow suggests the likely presence of cerebral autoregulation in our population. [ABSTRACT FROM AUTHOR]

Purpose: To identify the risk factors for adverse outcomes after pediatric pyeloplasty. Methods: We conducted a retrospective review of all children under the age of 14 years who underwent primary pyeloplasty for unilateral ureteropelvic junction (UPJ) obstruction at a single teaching hospital in Tunisia between January 1, 2013, and December 31, 2022. Results: A total of 103 patients were included. Median age of patients at surgery was 27 months (interquartile range [IQR], 13–44). On ultrasound, median renal pelvic anteroposterior diameter was 3.2 cm (IQR, 2.3–4), and the median renal cortex thickness (RCT) was 2.5 mm (IQR, 2–3.5). Median differential renal function (DRF) on preoperative radionuclide renal scan was 40% (IQR, 30–46). Postoperative adverse outcomes occurred in 28 patients (27.2%). These included 19 cases of urinary tract infections (UTIs), 11 cases of UPJ restenosis, four cases of UPJ leakage, two cases of urinoma, and two cases of diversion‐related complications. Multivariate logistic regression analysis revealed two factors significantly and independently related to postoperative negative outcomes: RCT <3 mm and DRF > 50%. Conclusion: Our study demonstrated that preoperative RCT on ultrasound of less than 3 mm and preoperative DRF on radionuclide renal scan of more than 50% were independent risk factors for adverse outcomes following pediatric pyeloplasty. These factors could be of interest in identifying, early on, patients who will develop postoperative negative outcomes, giving them more attention and support, and explaining the prognosis to the patient and family. [ABSTRACT FROM AUTHOR]

Background and Aims: Comparison of analgesic efficacy of ultrasound-guided transmuscular quadratus lumborum block (QL-3) and erector spinae block (ESP) in children undergoing open pyeloplasty was done in this study. Material and Methods: This was a randomized, double-blinded, controlled study conducted in a tertiary care center, operating rooms, post-anesthesia care unit (PACU), and paediatric surgical ward. Sixty children of age 1-6 years, with American Society of Anesthesiologists (ASA) status I or II, undergoing elective open pyeloplasty were included in the study. Patients were randomized into two groups: group I (QL block-3) and group II (ESP). Both blocks were performed under USG guidance using 0.5 ml/kg of 0.25% ropivacaine after induction of general anesthesia. Postoperative Modified Objective Pain Score (MOPS), perioperative hemodynamic parameters, perioperative time for first rescue analgesia, total rescue analgesia, and incidence of complications were recorded. Statistical tests were applied as follows: (i) quantitative variables were compared using independent t-test/Mann-Whitney test (when the data sets were not normally distributed) between the two groups, and repeated measure analysis of variance (ANOVA)/Friedman test was used for comparison between different time intervals within the same group and (ii) qualitative variables were correlated using the Chi-square test/Fisher's exact test. A P value of <0.05 was considered statistically significant. Results: Pain was assessed using MOPS in the postoperative period at 0, 30 min, 1, 2, 4, 6, 12, and 24 h. Overall, the pain scores were low and showed a decreasing trend toward baseline as time progressed. Group I showed lower score, but was statistically significant only at the sixth hour. Highest mean score was 2.4 ± 2.01 in group I and 2.67 ± 2.32 in group II. Perioperative hemodynamic parameters were comparable. Total rescue analgesia during the perioperative period was not statistically significant (intraoperative P = 0.075 and postoperative P = 0.928). Also, 63.33% patients in group I and 63% patients in group II required rescue analgesia in the postoperative period and were comparable. Mean ± standard deviation (SD) for first rescue analgesia time was 6.32 ± 12.57 in group I and 16.67 ± 31.25 in group II, but not significant. The distribution in group II was skewed, hence the larger value for group II, but when compared to group I, this was statistically not significant. Conclusion: Both ultrasound-guided ESP block and QL block using 0.25% ropivacaine 0.5 ml/kg provided adequate analgesia during the first 24 h post-surgery in children undergoing open pyeloplasty. The fentanyl requirement during the first 24-h postoperative period was also decreased. [ABSTRACT FROM AUTHOR]