Jonathan Ewald¹, Herbert Hodgson¹, Jerry Thomas¹, Nazih Khater², Mohamed Keheila², Muhannad Alsyouf², Javier L. Arenas², Mohammad Hajiha², D. Duane Baldwin²

Canadian Journal of Urology, Vol.27, No.2, pp. 10174-10180, 2020

Abstract Introduction: To improve the success rate and safety of ureteral stent insertion, we sought to identify the effect of guidewire type and prior use upon the force needed to advance a 6Fr ureteral stent over various guidewires.
Materials and methods: Two hundred forty stent insertion trials were performed in an ex vivo porcine urinary tract model. Ten trials were randomly performed over 12 new and 12 used guidewires. For each trial, the force required to advance a 6Fr Cook double-pigtail ureteral stent was recorded. Guidewires included the Olympus Glidewire, Cook Fixed Core, and Boston Scientific Amplatz Super… More >

Gregory P. Murphy¹, Kushan D. Radadia¹, Jonathan Weese¹, Cooper R. Benson², Niraj Badhiwala¹, Alethea Paradis¹, Joel Vetter¹, Steven B. Brandes²

Canadian Journal of Urology, Vol.27, No.3, pp. 10228-10232, 2020

Abstract Introduction: To evaluate flexible pediatric cystoscopy (FPC) as an adjunctive procedure to retrograde urethrography (RUG) and voiding cystourethrography (VCUG) in the preoperative setting for male urethral strictures. Since imaging interpretation of stricture length and caliber can be difficult at times, we sought to evaluate diagnostic utility of FPC to predict reconstructive surgery.
Materials and methods: Reconstructive urology databases at Washington University and Columbia University were queried from 2010-2017. A total of 185 anterior urethroplasty patients met inclusion criteria. All surgeries were performed by a single surgeon. There were 102 patients that underwent preoperative FPC (7.5 Fr in… More >

Patrick J. Hensley, Amanda F. Saltzman, Ali M. Ziada

Canadian Journal of Urology, Vol.27, No.4, pp. 10329-10335, 2020

Abstract Introduction: Management of pediatric renal masses has lagged behind adult paradigms adopting minimally invasive surgery (MIS) and nephron-sparing surgery (NSS). This study investigated national practice patterns between pediatric urologists (PU) and pediatric surgeons (PS) in pediatric renal malignancy.
Materials and methods: The Pediatric National Surgical Quality Improvement Program database was queried for CPT codes for radical/partial nephrectomy from 2012-2017 performed for renal malignancy. Patients were grouped by specialty and operative approach.
Results: PU managed 175 (17%) patients while PS managed 811 (77%). PU were more likely to use MIS (14% versus 5%, p < 0.001) and NSS (33%… More >

Amy M. Reed¹, Eric C. Umbreit², James K. Aden¹, Christopher L. Allam¹

Canadian Journal of Urology, Vol.27, No.4, pp. 10317-10321, 2020

Abstract Introduction: To determine the efficacy and safety of using the semi-rigid ureteroscope as the only ureteral dilator for primary ureteroscopy (URS) in the treatment of renal stones.
Materials and methods: A retrospective review of primary URS for renal stone disease was performed on consecutive patients treated by a single provider from 2013 to 2017. Utilizing wire placement under fluoroscopic guidance and direct visual ureteroscopic dilation with a semi-rigid ureteroscope, primary outcome was successful completion of stone treatment. In addition, perioperative safety was evaluated.
Results: A total of 126 consecutive cases of primary URS using the semi-rigid ureteroscope as… More >

Tetsuo Fujita, Morihiro Nishi, Daisuke Ishii, Kazumasa Matsumoto, Kazunari Yoshida, Masatsugu Iwamura

Canadian Journal of Urology, Vol.27, No.5, pp. 10402-10406, 2020

Abstract Introduction: To explore postoperative operation-side renal functional outcome after laparoscopic partial nephrectomy (LPN) using dynamic renal scintigraphy.
Materials and methods: Between July 2006 and December 2014, 62 patients with localized renal tumor received ischemic LPN at our institution. Preoperative, 6 months postoperative, and 12 months postoperative split renal functions were evaluated by dynamic renal scintigraphy using radionuclide technetium-99m-mercaptoacetyltriglycine. Postoperative operation-side renal function was calculated. To assess the significant factors affecting postoperative operation-side renal functional decrease, simple regression and multiple regression analyses were carried out.
Results: Postoperative operation-side renal functions were significantly decreased to 86.6% at 6 months and… More >

Jordan Allen, Necole M. Streeper

Canadian Journal of Urology, Vol.27, No.6, pp. 10488-10491, 2020

Abstract Obesity is a known risk factor for recurrent nephrolithiasis and it can be challenging to provide safe surgical intervention in the super obese population. Despite high weight limits on surgical beds, these often do not take into account positioning the patient on the end of the bed for dorsal lithotomy, which can risk an unsteady bed. In addition, depending on patient habitus the leg stirrups may not accommodate. There is limited literature that discusses the technical approach for positioning super obese patients in dorsal lithotomy when the weight limit approaches or exceeds the capacity of More >

RAJEEV KUMAR

Journal of Polymer Materials, Vol.37, No.3-4, pp. 131-142, 2020, DOI:10.32381/JPM.2020.37.3-4.2

Abstract The optical, electrical and acoustical properties of a polymer solution based on polyvinyl pyrrolidone (PVP) doped with different concentration of cupric sulphate (CuSO₄ ) were studied.UVVIS spectroscopy results reflected that absorption increases in asymmetric manner and the absorption peak showed red shift with increasing Cu ions concentration. The optical band gap (direct and indirect) was found to decrease with increase in Cu ions concentration in the polymer due to increase in the density of localized states in the band-gap.The value of Urbach energy is also evaluated from the transmission spectra and the activation energies are also More >

Lin Pan, Jinhong Xia, Hongxing Han^*

FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.6, pp. 1219-1228, 2020, DOI:10.32604/fdmp.2020.010545 - 17 December 2020

Abstract In this paper, the discrete element method (DEM) is used to study the microstructure of expansive soils. The results of the numerical calculations are in agreement with the stress-strain triaxial test curve that is obtained for a representative expansive soil. Biaxial compression tests are conducted for different confining pressures (50 kpa, 100 kpa, and 150 kpa). Attention is paid to the following aspects: deviatoric stress, boundary energy, friction energy, bond energy, strain energy, kinetic energy, and the contact force between grains when the test specimen is strained and to the effect of the different confining More >

Li Bao¹, Xiaowei Tian², Jing Zhang³, Li Chen⁴, Kui Gao^5,*

Oncologie, Vol.22, No.3, pp. 167-178, 2020, DOI:10.32604/oncologie.2020.012495

Abstract Ulinastatin combined with dexmedetomidine can improve postoperative cognitive function and central nerve specific protein (S-100β) level in elderly colorectal cancer (CC) patients after laparoscopic. Altogether 178 elderly patients who underwent laparoscopic colorectal cancer surgery in our hospital from February 2018 to August 2019 were selected and divided into two groups according to the treatment methods. Those anesthetized by dexmedetomidine were regarded as the routine group (RG, 83 cases), and those anesthetized by ulinastatin and dexmedetomidine were considered as the combined group (CG, 95 cases). The operation conditions of the two groups, the pain scores (VAS)… More >

Pallabi Sharma^1,*, Kangkana Bora², Kunio Kasugai³, Bunil Kumar Balabantaray¹

Oncologie, Vol.22, No.3, pp. 129-145, 2020, DOI:10.32604/oncologie.2020.013870

Abstract In this paper, we address a current problem in medical image processing, the detection of colorectal cancer from colonoscopy videos. According to worldwide cancer statistics, colorectal cancer is one of the most common cancers. The process of screening and the removal of pre-cancerous cells from the large intestine is a crucial task to date. The traditional manual process is dependent on the expertise of the medical practitioner. In this paper, a two-stage classification is proposed to detect colorectal cancer. In the first stage, frames of colonoscopy video are extracted and are rated as significant if More >