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experimental anastomosis

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https://www.readbyqxmd.com/read/29932372/fibrin-patch-influences-the-expression-of-hypoxia-inducible-factor-1%C3%AE-and-nuclear-factor-%C3%AE%C2%BAbp65-factors-on-ischemic-intestinal-anastomosis
#1
Carlos García-Vásquez, María J Fernández-Aceñero, Soledad García Gómez-Heras, Carlos Pastor
The intestinal anastomotic failure is one of the most severe complications in gastrointestinal surgery. Despite the great surgical improvements during the last decade, anastomotic leak rates remain practically the same, with a dramatically high grade of morbidity for patients. Leakages are usually the final consequence of ischemia in the anastomosis, leading to tissue hypoxia. In response to hypoxia, the cell orchestrates a variety of coordinated responses in order to restore oxygen homeostasis. The molecular mechanism of hypoxia sensitivity involves oxygen sensing hydroxylases, prolyl-hydroxylases, orchestrating two main transcription factors related to induction of inflammation and angiogenesis, namely nuclear factor-κB and hypoxia-inducible factors...
June 2018: Experimental Biology and Medicine
https://www.readbyqxmd.com/read/29850942/the-effect-of-gender-on-early-colonic-anastomotic-wound-healing
#2
Marie Kjaer, Hrefna Kristjánsdóttir, Line Andersen, Anne-Marie Heegaard, Magnus S Ågren, Lars N Jorgensen
PURPOSE: Clinically, male patients subjected to colorectal surgery are more prone to develop anastomotic leakage than female patients by unknown mechanisms. Our aim was to investigate the impact of gender on anastomotic wound healing using an experimental model. METHODS: One-layer colonic anastomosis was constructed in 8-week-old 28 male and 32 female Sprague-Dawley rats. Animals of one group (n = 30) were sacrificed immediately after surgery day 0 and the other group (n = 30) on postoperative day 3...
May 31, 2018: International Journal of Colorectal Disease
https://www.readbyqxmd.com/read/29849808/application-of-a-novel-embeddedness-like-pancreaticojejunostomy-anastomosis-technique-used-in-pancreaticoduodenectomy
#3
Xuefeng Xu, Yang Lv, Lei Zhang, Baobao Xin, Jian-Ang Li, Dansong Wang, Tiantao Kuang, Wenhui Lou, Dayong Jin
Optimized pancreaticojejunostomy anastomosis was used to investigate the effects on the incidence rate of postoperative complications in pancreaticoduodenectomy. The data of 250 patients who underwent pancreaticoduodenectomy between August 2011 and December 2015 were analyzed; all surgery was performed by a single team. The first 100 surgeries were performed using traditional pancreaticojejunostomy anastomosis, whereas the next 150 patients underwent novel pancreaticojejunostomy anastomosis (the experimental group)...
May 2018: Oncology Letters
https://www.readbyqxmd.com/read/29792717/postoperative-monitoring-of-colorectal-anastomosis-experimental-study
#4
J Kalvach, O Ryska, J Pazin, J Hadac, S Juhas, J Juhásová, J Martínek, M Ryska
INTRODUCTION: Inadequate blood supply is one of the major risk factors for colorectal anastomotic leak. Early postoperative detection of local ischemic changes can predict complicated healing and lead to better outcome. Microdialysis (MD) offers real-time evaluation of adequate bowel perfusion through monitoring of tissue metabolism. The aim of this study was to assess the feasibility of MD for early detection of ischemic changes in colorectal anastomosis. METHOD: Five pigs with end-to-end colorectal anastomosis were included...
2018: Rozhledy V Chirurgii: Měsíčník Československé Chirurgické Společnosti
https://www.readbyqxmd.com/read/29742454/the-pivotal-role-of-angiogenesis-in-a-multi-scale-modeling-of-tumor-growth-exhibiting-the-avascular-and-vascular-phases
#5
Hooman Salavati, M Soltani, Saeid Amanpour
The mechanisms involved in tumor growth mainly occur at the microenvironment, where the interactions between the intracellular, intercellular and extracellular scales mediate the dynamics of tumor. In this work, we present a multi-scale model of solid tumor dynamics to simulate the avascular and vascular growth as well as tumor-induced angiogenesis. The extracellular and intercellular scales are modeled using partial differential equations and cellular Potts model, respectively. Also, few biochemical and biophysical rules control the dynamics of intracellular level...
May 6, 2018: Microvascular Research
https://www.readbyqxmd.com/read/29740586/supermicrosurgery-history-applications-training-and-the-future
#6
Ido Badash, Daniel J Gould, Ketan M Patel
Supermicrosurgery, a technique of dissection and anastomosis of small vessels ranging from 0.3 to 0.8 mm, has revolutionized the fields of lymphedema treatment and soft tissue reconstruction. The technique offers several distinct benefits to microsurgeons, including the ability to manipulate small vessels that were previously inaccessible, and to minimize donor-site morbidity by dissecting short pedicles in a suprafascial plane. Thus, supermicrosurgery has become increasingly popular in recent years, and its applications have greatly expanded since it was first introduced 20 years ago...
2018: Frontiers in Surgery
https://www.readbyqxmd.com/read/29726640/-establishment-of-a-penile-transplantation-model-in-beagle-dogs
#7
Yong-Bin Zhao, Wei-Lie Hu, Li-Chao Zhang, Jun Liu, Chang-Zheng Zhang, Bang-Qi Wang, Yuan-Song Xiao, Hui Hu, Ming Ying
Objective: To investigate the feasibility of establishing a model of allograft penile transplantation in adult beagle dogs and explore the conditions for constructing a stable animal model of penis transplant. METHODS: Following the principles of similarity, repeatability, feasibility, applicability, and controllability in the construction of experimental animal models, we compared the major anatomic features of the penis of 20 adult beagle dogs with those of 10 adult men...
August 2017: Zhonghua Nan Ke Xue, National Journal of Andrology
https://www.readbyqxmd.com/read/29719911/proper-choice-of-vessels-for-supermicrosurgery-training-an-experimental-animal-study
#8
Yooseok Ha, Seung Han Song, Nak Heon Kang, Sang-Ha Oh
BACKGROUND:  Reconstruction using supermicrosurgery, a technique of microneurovascular anastomosis for smaller vessels (< 0.8 mm), has become popular. Experimental animal studies for supermicrosurgery training have been reported; however, there have been few studies performed according to vessel diameter and pedicle length. In this study, the external diameters of four vessels (femoral, superficial epigastric, axillary, and common thoracic) and pedicle length of two flaps (superficial epigastric and common thoracic-long thoracic) were measured...
May 2, 2018: Journal of Reconstructive Microsurgery
https://www.readbyqxmd.com/read/29696058/our-20-year-experience-with-experimental-colonic-anastomotic-healing
#9
REVIEW
Dimitrios Raptis, Manousos-Georgios Pramateftakis, Ioannis Kanellos
Aim: To present our experience with experimental colonic anastomoses and compare it with the results of other experienced researchers. Materials and Method: The published experimental studies of our research group up to 1996, as well as results of other researchers in this field, are demonstrated and discussed. Different actions of administered substances on the anastomotic healing were compared and represented. Various chemotherapeutic agents were evaluated in experimental models without colorectal cancer as independent risk factors for the anastomotic healing...
January 2018: Journal of Medicine and Life
https://www.readbyqxmd.com/read/29681948/regeneration-of-tracheal-tissue-in-partial-defects-using-porcine-small-intestinal-submucosa
#10
Nelson Bergonse Neto, Lianna Ferrari Jorge, Julio C Francisco, Bruna Olandoski Erbano, Barbara Evelin Gonçalves Barboza, Larissa Luvison Gomes da Silva, Marcia Olandoski, Katherine Athayde Teixeira de Carvalho, Luiz Felipe Pinho Moreira, Jose Rocha Faria Neto, Eltyeb Abdelwahid, Luiz Cesar Guarita-Souza
Background: Surgical correction of tracheal defects is a complex procedure when the gold standard treatment with primary end-to-end anastomosis is not possible. An alternative treatment may be the use of porcine small intestinal submucosa (SIS). It has been used as graft material for bioengineering applications and to promote tissue regeneration. The aim of this study was to evaluate whether SIS grafts improved tracheal tissue regeneration in a rabbit model of experimental tracheostomy...
2018: Stem Cells International
https://www.readbyqxmd.com/read/29661648/one-year-rat-study-of-ibta-induced-microbiotube-microvascular-grafts-with-an-ultra-small-diameter-of-0-6-mm
#11
Daizo Ishii, Jun-Ichiro Enmi, Ryosuke Iwai, Kaoru Kurisu, Eisuke Tatsumi, Yasuhide Nakayama
OBJECTIVE: The world's smallest calibre "microbiotube" vascular graft was recently developed, with an inner diameter of 0.6 mm. It was formed using in-body tissue architecture (iBTA) and has a high degree of patency and capacity for regeneration in the acute phase, 1 month after implantation. This consecutive study investigated the compatibility and stability of microbiotubes in the chronic phase of implantation for 12 months for potential application in microsurgery. METHODS: This was an in vivo experimental study...
June 2018: European Journal of Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/29658991/novel-de-novo-synthesized-phosphate-carrier-compound-aba-peg20k-pi20-suppresses-collagenase-production-in-enterococcus-faecalis-and-prevents-colonic-anastomotic-leak-in-an-experimental-model
#12
M Wiegerinck, S K Hyoju, J Mao, A Zaborin, C Adriaansens, E Salzman, N H Hyman, O Zaborina, H van Goor, J C Alverdy
BACKGROUND: Previous work has demonstrated that anastomotic leak can be caused by collagenolytic bacteria such as Enterococcus faecalis via an effect on wound collagen. In humans, E. faecalis is the organism cultured most commonly from a leaking anastomosis, and is not routinely eliminated by standard oral or intravenous antibiotics. Novel strategies are needed to contain the virulence of this pathogen when present on anastomotic tissues. METHODS: Polyphosphorylated polymer ABA-PEG20k-Pi20 was tested in mice for its ability to prevent anastomotic leak caused by collagenolytic E...
April 16, 2018: British Journal of Surgery
https://www.readbyqxmd.com/read/29658681/laparoscopic-radical-prostatectomy-in-2018-20-years-of-worldwide-experiences-experimentations-researches-and-refinements
#13
Aldo Brassetti, Renaud Bollens
INTRODUCTION: After the first feasibility report in 1997, a growing interest has risen in the urologic community for laparoscopic radical prostatectomy (LRP) and several authors have contributed to the evolution of the technique. We attempt a review of the available evidences and provide a broad framework of different technical refinements considering their impact on pentafecta. EVIDENCE ACQUISITION: The PubMed/Medline database was searched. Duplicates and "Expert opinion" papers were removed...
April 13, 2018: Minerva Chirurgica
https://www.readbyqxmd.com/read/29545075/interventional-therapies-in-pulmonary-hypertension
#14
Julio Sandoval
Despite advances in drug therapy, pulmonary hypertension-particularly arterial hypertension (PAH)-remains a fatal disease. Untreatable right heart failure (RHF) from PAH eventually ensues and remains a significant cause of death in these patients. Lowering pulmonary input impedance with different PAH-specific drugs is the obvious therapeutic target in RHF due to chronically increased afterload. However, potential clinical gain can also be expected from attempts to unload the right heart and increase systemic output...
March 12, 2018: Revista Española de Cardiología
https://www.readbyqxmd.com/read/29522527/the-importance-of-geometry-in-the-corneal-micropocket-angiogenesis-assay
#15
James A Grogan, Anthony J Connor, Joe M Pitt-Francis, Philip K Maini, Helen M Byrne
The corneal micropocket angiogenesis assay is an experimental protocol for studying vessel network formation, or neovascularization, in vivo. The assay is attractive due to the ease with which the developing vessel network can be observed in the same animal over time. Measurements from the assay have been used in combination with mathematical modeling to gain insights into the mechanisms of angiogenesis. While previous modeling studies have adopted planar domains to represent the assay, the hemispherical shape of the cornea and asymmetric positioning of the angiogenic source can be seen to affect vascular patterning in experimental images...
March 2018: PLoS Computational Biology
https://www.readbyqxmd.com/read/29509106/novel-method-for-restoration-of-anorectal-function-following-spinal-cord-injury-via-nerve-transfer-in-rats
#16
Bingbo Bao, Kai Fu, Xianyou Zheng, Haifeng Wei, Pengbo Luo, Hongyi Zhu, Xiaozhong Zhu, Xingwei Li, Tao Gao
OBJECTIVES: Nerve transfer has been developed to restore partial function after serious nerve injuries, for example, restoring bladder control after spinal cord injury (SCI). Our aim here was to establish a preclinical proof-of-concept model using nerve transfer for restoring anorectal function after SCI. SETTING: We used laminectomy to model SCI, and bilateral spinal ventral and dorsal nerve root anastomosis to re-establish connectivity to the anorectal musculature...
March 6, 2018: Journal of Spinal Cord Medicine
https://www.readbyqxmd.com/read/29481411/targeting-reflux-free-veins-with-a-vein-visualizer-to-identify-the-ideal-recipient-vein-preoperatively-for-optimal-lymphaticovenous-anastomosis-in-treating-lymphedema
#17
Johnson Chia-Shen Yang, Shao-Chun Wu, Min-Hsien Chiang, Wei-Che Lin
Lymphaticovenous anastomosis is one of the main surgical treatments nowadays for alleviating lymphedema. A successful lymphaticovenous anastomosis relies on being able to identify "functional" lymphatic collecting vessels that are still capable of transporting lymph, and a nearby vein that is, ideally, reflux-free. This is a retrospective study. A total of 28 lymphedema patients were enrolled from October of 2016 to March of 2017 in Kaohsiung Chang Gung Hospital, Kaohsiung, Taiwan. A noninvasive vein visualizer was used to preselect reflux-free veins for lymphaticovenous anastomosis from five female patients...
March 2018: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/29475213/modified-multivisceral-transplantation-with-native-spleen-removal-in-rats
#18
Pablo Stringa, Nidia Monserrat Arreola, Ane M Andres Moreno, Carlota Largo, Martín Rumbo, Francisco Hernandez
BACKGROUND:  Modified multivisceral transplantation (MMVTx) refers to the use of a graft that includes all abdominal organs except the liver. The use of this type of transplant in children and adults expanded over the last years with good results. However, long-term survival in experimental models has not been reported. Our aim is to describe in detail some technical modifications of MMVTx to obtain long-term survival. MATERIALS AND METHODS:  Syngeneic (Lewis-Lewis) heterotopic MMVTx was performed in 16 male rats (180-250 g)...
February 23, 2018: European Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/29473452/a-new-surgical-device-for-anterograde-intraoperative-rectal-washout
#19
Fabio Rondelli, Roberto Santinelli, Paolo Stella, Walter Bugiantella, Graziano Ceccarelli, Ruben Carlo Balzarotti, Michele De Rosa, Nicola Avenia
BACKGROUND: Colorectal cancer is the fourth most diffuse cause of death in the world and local recurrence is associated with a reduced long-term life expectancy, with a reduced quality of life. Rectal washout at the anastomosis site leads to a statistically significant reduction of local recurrences. METHODS: We developed the idea of a new laparoscopic stapler with an integrated washout system that could decontaminate the rectal stump before resection, without the need to enlarge the standard surgical incision or even to distort the incision site, closing the rectal stump just below the inferior part of the cancer, and then proceeding with the resection and stapling of the distal part of the tumor...
February 1, 2018: Surgical Innovation
https://www.readbyqxmd.com/read/29454630/microsurgical-anastomosis-of-renal-vasculature-in-rats-a-practical-platform-for-acellular-kidney-transplantation
#20
Abdol-Mohammad Kajbafzadeh, Reza Khorramirouz, Seyede Maryam Kameli, Behnam Nabavizadeh
End-stage renal disease is becoming a contemporary global concern with increasing prevalence. The available treatment strategies are limited to dialysis and renal transplantation. However, limited organ supply and autoimmune rejection are the shortcomings that limit widespread application of transplantation. Favorably, regenerative medicine is able to provide acellular natural scaffolds for renal transplantation. Experimental surgeries in animal models are a fundamental step in transplantation research. This video presents a practical method for transplantation of bilateral acellular kidneys in a rat model, which could serve as a key step for further research...
February 3, 2018: Journal of Pediatric Urology
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