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Ureter obstruction

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https://www.readbyqxmd.com/read/29777349/robot-assisted-laparoscopic-pyeloplasty-a-single-centre-experience
#1
Thomas Charles Wood, Nicholas Raison, Oussama El-Hage, Kamran Ahmed, Declan Cahill, Benjamin J Challacombe, Muhammad Shamim Khan, Prokar Dasgupta
BACKGROUND: Ureteropelvic junction obstruction (UPJO) is characterised by an obstruction compromising the passage of urine from the renal pelvis into the ureter, and can be corrected by Robot-Assisted Laparoscopic Pyeloplasty (RALP). We aimed to evaluate the surgical outcomes of RALP, and examine the rates of true pain resolution following the procedure. METHODS: We retrospectively explored the records of all patients who underwent RALP between April 2005 and January 2017...
May 17, 2018: Surgical Endoscopy
https://www.readbyqxmd.com/read/29775449/-dodatkowa-t%C3%A4-tnica-nerkowa-przyczyn%C3%A4-skrajnego-wodonercza-u-5-letniego-ch%C3%A5-opca
#2
Grażyna Krzemień, Jarosław Sołtyski, Agnieszka Szmigielska, Stanisław Warchoł, Teresa Dudek-Warchoł, Aleksandra Jakimów-Kostrzewa
Hydronephrosis in children is most often due to an intrinsic ureteropelvic junction obstruction or by compression on ureter by accessory renal artery coming from the aorta to the lower pole of the kidney. AIM: The aim of study was to present a case with a late onset of hydronephrosis caused by accessory renal artery. CASE REPORT: 5-year old boy with a mild pyelectasia during first 10 months of age was admitted to hospital because of abdominal pain and vomiting. Abdominal ultrasound revealed a marked dilatation of the right pelvicalyceal system with renal pelvis measuring 23 mm in anterior-posterior (ap) diameter, enlargement of calyces to 10 mm and narrowed cortex to 5 mm...
April 23, 2018: Polski Merkuriusz Lekarski: Organ Polskiego Towarzystwa Lekarskiego
https://www.readbyqxmd.com/read/29771475/usefulness-of-real-time-three-dimensional-ultrasound-in-percutaneous-nephrostomy-an-animal-study
#3
Hongzhang Hong, Xiaojuan Qin, Shengwei Zhang, Feixiang Xiang, Yujie Xu, Haibing Xiao, Kazobinka Gallina, Wen Ju, Fuqing Zeng, Xiaoping Zhang, Mingyue Ding, Huageng Liang, Xuming Zhang
OBJECTIVES: To evaluate the effect of real-time 3-dimensional ultrasound (real-time 3DUS) in guiding percutaneous nephrostomy (PCN). MATERIALS AND METHODS: A hydronephrosis model was devised by obstruction of ureters of 16 beagles divided equally into groups 1 and 2. In group 1, the PCN was guided using real-time three-dimensional ultrasound whereas the PCN was guided using two-dimensional ultrasound (2DUS) in group 2. The clearance of needle tract, puncture time, and puncture times were recorded for the two groups...
May 17, 2018: BJU International
https://www.readbyqxmd.com/read/29761687/emergency-extracorporeal-shockwave-lithotripsy-eswl-as-opposed-to-delayed-swl-dswl-for-the-treatment-of-acute-renal-colic-due-to-obstructive-ureteral-stone-a-prospective-randomized-trial
#4
Stefano Bucci, Paolo Umari, Michele Rizzo, Nicola Pavan, Giovanni Liguori, Fabio Barbone, Carlo Trombetta
BACKGROUND: To assess the efficacy of emergency extracorporeal shockwave lithotripsy (eSWL) as first-line treatment in patients with acute colic due to obstructive ureteral stone. METHODS: 74 patients were randomized to emergency SWL within 12 hours (eSWL group) and deferred SWL later than 3 days (dSWL group). Follow-up included ultrasound, KUB (Kidney-Ureter-Bladder) radiography and CT (computed tomography) scan at 24 hours, 7 days, 1 and 3 months from the treatment...
May 14, 2018: Minerva Urologica e Nefrologica, the Italian Journal of Urology and Nephrology
https://www.readbyqxmd.com/read/29741977/laparoscopic-pelvic-exenteration-for-locally-advanced-rectal-cancer-technique-and-short-term-outcomes
#5
Ashish Pokharkar, Praveen Kammar, Ashwin D'souza, Rahul Bhamre, Pavan Sugoor, Avanish Saklani
BACKGROUND: Since last two decades minimally invasive techniques have revolutionized surgical field. In 2003 Pomel first described laparoscopic pelvic exenteration, since then very few reports have described minimally invasive approaches for total pelvic exenteration. METHODS: We report the 10 cases of locally advanced rectal adenocarcinoma which were operated between the periods from March 1, 2017 to November 11, 2017 at the Tata Memorial Hospital, Mumbai. All male patients had lower rectal cancer with prostate involvement on magnetic resonance imaging (MRI)...
May 9, 2018: Journal of Laparoendoscopic & Advanced Surgical Techniques. Part A
https://www.readbyqxmd.com/read/29738802/intravoxel-incoherent-motion-mri-derived-parameters-and-t2-relaxation-time-for-noninvasive-assessment-of-renal-fibrosis-an-experimental-study-in-a-rabbit-model-of-unilateral-ureter-obstruction
#6
Sungmin Woo, Jeong Yeon Cho, Sang Youn Kim, Seung Hyup Kim
PURPOSE: To evaluate the association of apparent diffusion coefficient (ADC), intravoxel incoherent motion (IVIM) MRI-derived parameters, and T2* relaxation time with histopathological changes observed during renal fibrogenesis in a rabbit model of unilateral ureter obstruction (UUO). METHODS: Twenty New Zealand White rabbits underwent baseline MRI followed by surgery (sham or UUO) and then follow-up MRI at postoperative day (POD) 0, 3, 7, and 14. Hematoxylin and eosin and Masson's trichrome staining was performed to evaluate cell density and area of fibrosis...
May 5, 2018: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29737631/a-fluid-structure-interaction-fsi-based-numerical-investigation-of-peristalsis-in-an-obstructed-human-ureter
#7
Ahmed Tasnub Takaddus, Prashanta Gautam, Abhilash J Chandy
Urine moves from the kidney to the bladder through the ureter. A series of compression waves facilitates this transport. Due to the highly concentrated mineral deposits in urine, stones are formed in the kidney and travel down through the urinary tract. While passing, a larger stone can get stuck and cause severe damage to ureter wall. Also, stones in the ureter obstructing the urine flow can cause pain and backflow of urine which in turn might require surgical intervention. The current study develops a 2D axisymmetric numerical model in order to gain an understanding of the ureter obstruction and its effects on the flow, which are critical in assessing the different treatment options...
May 8, 2018: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/29730498/computer-aided-detection-of-ureteral-stones-in-thin-slice-computed-tomography-volumes-using-convolutional-neural-networks
#8
Martin Längkvist, Johan Jendeberg, Per Thunberg, Amy Loutfi, Mats Lidén
Computed tomography (CT) is the method of choice for diagnosing ureteral stones - kidney stones that obstruct the ureter. The purpose of this study is to develop a computer aided detection (CAD) algorithm for identifying a ureteral stone in thin slice CT volumes. The challenge in CAD for urinary stones lies in the similarity in shape and intensity of stones with non-stone structures and how to efficiently deal with large high-resolution CT volumes. We address these challenges by using a Convolutional Neural Network (CNN) that works directly on the high resolution CT volumes...
April 27, 2018: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/29728432/ureterosciatic-hernia-treated-with-ureteral-stent-placement
#9
Yusuke Nakazawa, Nobuyo Morita, Ippei Chikazawa, Katsuhito Miyazawa
A 92-year-old female with a history of asthma and chronic heart failure presented with left lumber back pain. Physical examination revealed knocking tenderness at the left costal-vertebral angle. Laboratory test results were within normal limits. Abdominal CT showed a left hydroureteronephrosis and an obstruction in the left distal ureter with herniation into the sciatic foramen. A ureteral stent was inserted into the left ureter and was removed after 2 months. She has not complained of pain or showed symptoms since the removal...
May 4, 2018: BMJ Case Reports
https://www.readbyqxmd.com/read/29723851/transplantation-of-telocytes-attenuates-unilateral-ureter-obstruction-induced-renal-fibrosis-in-rats
#10
Long Zheng, Long Li, Guisheng Qi, Mushuang Hu, Chao Hu, Shuo Wang, Jiawei Li, Mingnan Zhang, Weitao Zhang, Yigang Zeng, Yi Zhang, Liping Li, Xuanchuan Wang, Miao Lin, Tongyu Zhu, Ruiming Rong
BACKGROUND/AIMS: Previous studies imply that telocytes may have a protective effect on fibrosis in various organs, including the liver, colon, and heart. The effect of telocytes on renal fibrosis remains unknown. Herein, this study was designed to investigate the effect of telocytes on renal fibrosis and the potential mechanisms involved. METHODS: In a unilateral ureteral obstruction (UUO)-induced renal fibrosis model, telocytes were injected via the tail vein every other day for 10 days...
April 28, 2018: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29723529/suppression-of-elp2-prevents-renal-fibrosis-and-inflammation-induced-by-unilateral-ureter-obstruction-uuo-via-inactivating-stat3-regulated-tgf-%C3%AE-1-and-nf-%C3%AE%C2%BAb-pathways
#11
Shan Lu, Hong-Wu Fan, Kai Li, Xiao-Di Fan
Renal fibrosis and inflammation are common underlying processes of progressive kidney diseases. Elongator protein 2 (Elp2), identical to signal transducer and activator of transcription-3 (STAT-3)-interacting protein-1 (Stip1), is a component of the Elongator complex that regulates RNA polymerase II. Elp2 regulates STAT-3 activation to control various cellular processes. The mechanisms of Elp2 prevention in renal interstitial fibrosis and inflammation remain unknown. In the study, Elp2 transgenic knockout (KO) and wild type (WT) mice were employed to investigate the effects of Elp2 on renal fibrosis and inflammation development after unilateral ureter obstruction (UUO) surgery...
April 30, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29699424/particle-accumulation-in-ureteric-stents-is-governed-by-fluid-dynamics-i-in-vitro-i-study-using-a-stent-on-chip-model
#12
Ali Mosayyebi, Qi Yann Yue, Bhaskar K Somani, Xunli Zhang, Costantino Manes, Dario Carugo
Objective To investigate the correlation between fluid dynamic processes and deposition of encrusting particles in ureteric stents. Materials and Methods Microfluidic models (referred to as 'stent-on-chip' or SOC) were developed to replicate relevant hydrodynamic regions of a stented ureter, including drainage holes and the cavity formed by a ureteric obstruction. Computational fluid dynamic (CFD) simulations were performed to determine the wall shear stress (WSS) field over the solid surfaces of the model, and the computational flow field was validated experimentally...
April 27, 2018: Journal of Endourology
https://www.readbyqxmd.com/read/29692526/utility-of-ureteric-jet-a-simple-yet-useful-tool-for-the-evaluation-of-complex-urogenital-anomaly
#13
Pranav K Santhalia, Disha Mittal, Arun K Gupta, Manisha Jana
In infants and young children with suspicion of genitourinary tract anomalies, ultrasonography (USG) is usually the first imaging modality. Advantages of USG are well described. In the evaluation of complex congenital urogenital anomalies, ultrasound examination needs to be tailored according to the clinical suspicion and to yield maximum information. Primary megaureter is a congenital anomaly, which is associated with dilatation of ureter above an adynamic segment at the vesicoureteric junction (VUJ). Two different types are described in the literature: refluxing and obstructive...
January 2018: Indian Journal of Radiology & Imaging
https://www.readbyqxmd.com/read/29684956/-clinical-utility-of-upper-urinary-tract-reconstruction-by-ileal-ureter-substitution
#14
Yoshinaga Okumura, Shusuke Akamatsu, Yoshiyuki Okada, Hiromitsu Negoro, Takashi Kobayashi, Naoki Terada, Toshinari Yamasaki, Yoshiyuki Matsui, Takahiro Inoue, Tomomi Kamba, Osamu Ogawa
We retrospectively reviewed the indications and outcomes of ileal-ureter substitution cases for complex ureteral reconstruction. We analyzed the patient clinical characteristics, outcomes, and complications of eight patients who had ileal ureter substitution surgery at Kyoto University Hospital between 2009 and 2016. The median patient age was 55.5 years (36-79), and the median follow up period was 25.5 months (7-85). Seven patients had unilateral ureteral obstruction (right:left=4:3), and one had bilateral ureteral obstruction...
March 2018: Hinyokika Kiyo. Acta Urologica Japonica
https://www.readbyqxmd.com/read/29676162/endoscopic-management-of-primary-obstructive-megaureter-a-systematic-review
#15
Alexander D Doudt, Chad R Pusateri, Matthew Christman
BACKGROUND: The gold standard treatment for primary obstructive megaureter (POM) with declining renal function, worsening obstruction, or recurrent infections is ureteral re-implantation with or without tapering. In infants, open surgery can be technically demanding and associated with significant morbidity. We conducted a systematic review of the literature with special interest in endoscopic management of POM and its outcomes. METHODS: A search was conducted of the MEDLINE/Ovid, PubMed, Embase, and Web of Science databases...
April 20, 2018: Journal of Endourology
https://www.readbyqxmd.com/read/29665512/is-the-menstrual-cup-harmless-a-case-report-of-an-unusual-cause-of-renal-colic
#16
Diogo Nunes-Carneiro, Tiago Couto, Vítor Cavadas
INTRODUCTION: Menstrual cup is increasingly gaining acceptance among women to control the menstrual period. The majority of brands advocate that these devices are 100% safe to the users, notwithstanding there are some reports of rare complications associated with these devices. PRESENTATION OF CASE: In this case we present a woman who developed a right renal colic using a menstrual cup. The pain was difficult to manage with conventional analgesics. The plain abdominal X-ray revealed the device in the pelvis occupying more than one third of the pelvis minor diameter and oriented to the right side...
April 9, 2018: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/29661459/midpole-ureterocalycostomy-for-renal-transplant-salvage-a-pediatric-case-report
#17
P D Imani, J T White, M Michael, K T Puttmann, C A O'Mahony, C J Koh
BACKGROUND: Ureteral obstruction is the most common urological complication of kidney transplantation. Obstruction secondary to ureteral stenosis can be an early or late complication. CASE REPORT: We present a patient in whom ureteral obstruction was initially identified at 2.5 months after transplant for which she underwent a midpole ureterocalycostomy between the midpole calyx of the transplant kidney and the native left ureter.
April 2018: Transplantation Proceedings
https://www.readbyqxmd.com/read/29653105/cst3-and-gdf15-ameliorate-renal-fibrosis-by-inhibiting-fibroblast-growth-and-activation
#18
Young-Im Kim, Hyun-Woo Shin, Yang-Sook Chun, Jong-Wan Park
The final strategies to care patients with end-stage renal fibrosis rely on dialysis and kidney transplantation. Because such treatments are invasive and cause health problems eventually, it is necessary to develop new therapeutic strategies for delaying the disease progress. We here searched for cytokines showing an anti-fibrotic activity in cell-based experiments. Cystatin C (CST3) and Growth differentiation factor 15 (GDF15) were identified to have anti-fibrotic activities in a cytokine array screening. In primary fibroblasts isolated from the mouse kidneys subjected to ureteral obstruction-induced fibrosis, each cytokine induced apoptotic cell death and reduced collagen production...
June 2, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29644043/inguinal-hernia-causing-extrinsic-compression-of-bilateral-ureters-leading-to-chronic-obstructive-uropathy
#19
Peter T Grice, Nkwam Nkwam
Ureteral inguinal hernias are a well-documented cause of obstructive uropathy with ureteric involvement in the hernia sac. In this unique case, the left-sided inguinal hernia causes extrinsic compression of bilateral ureters outside of the hernia sac leading to chronic obstructive uropathy, which is demonstrated on non-contrast CT and cystogram. This patient was managed with nephrostomy and subsequently antegrade stenting with nephrostomy removal. Prior to nephrostomy removal, nephrostogram demonstrated tapering of the left ureter in the pelvis...
April 2018: Journal of Surgical Case Reports
https://www.readbyqxmd.com/read/29621961/antegrade-balloon-dilatation-as-a-treatment-option-for-posttransplant-ureteral-strictures-case-series-of-50-patients
#20
Liselotte S S Ooms, Adriaan Moelker, Joke I Roodnat, Jan N M Ijzermans, Mirza M Idu, Turkan Terkivatan
OBJECTIVES: The aim of this study was to investigate the effects of antegrade balloon dilatation on ureteral strictures that developed after kidney transplant. MATERIALS AND METHODS: The hospital databases of the Erasmus Medical Center (Rotterdam, The Netherlands) and the Academic Medical Center (Amsterdam, The Netherlands) were retrospectively screened for patients who underwent balloon dilatation after kidney transplant. Balloon dilatation was technically successful whenever it was able to pass the strictured segment with the guidewire followed by balloon inflation; the procedure was clinically successful if no further interventions (for example, surgical revision of the ureteroneocystostomy or prolonged double J placement) were necessary...
April 2018: Experimental and Clinical Transplantation
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