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https://www.readbyqxmd.com/read/28800493/efficient-simulation-of-elastic-guided-waves-interacting-with-notches-adhesive-joints-delaminations-and-inclined-edges-in-plate-structures
#1
Hauke Gravenkamp
This paper presents an approach to model transmission and reflection phenomena of elastic guided waves in plates. The formulation is applied to plate structures containing notches, inclined edges, delaminations or (adhesive) joints. For these cases, only the thickness direction of the structure needs to be discretized at several locations, while the direction of propagation is described analytically. Consequently, the number of degrees of freedom is very small. Semi-infinite domains can be modeled, in which case the radiation condition is fulfilled exactly...
August 1, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28733748/preoperative-botulinum-toxin-a-enabling-defect-closure-and-laparoscopic-repair-of-complex-ventral-hernia
#2
Omar Rodriguez-Acevedo, Kristen E Elstner, Anita S W Jacombs, John W Read, Rodrigo Tomazini Martins, Fernando Arduini, Michael Wehrhahm, Colette Craft, Peter H Cosman, Anthony N Dardano, Nabeel Ibrahim
INTRODUCTION: Operative management of complex ventral hernia still remains a significant challenge for surgeons. Closure of large defects in the unprepared abdomen has serious pathophysiological consequences due to chronic contraction and retraction of the lateral abdominal wall muscles. We report outcomes of 56 consecutive patients who had preoperative Botulinum toxin A (BTA) abdominal wall relaxation facilitating closure and repair. METHODS: This was a prospective observational study of 56 patients who underwent ultrasound-guided BTA into the lateral abdominal oblique muscles prior to elective ventral hernia repair between November 2012 and January 2017...
July 21, 2017: Surgical Endoscopy
https://www.readbyqxmd.com/read/28502075/vacuum-assisted-wound-closure-and-mesh-mediated-fascial-traction-for-open-abdomen-therapy-a-systematic-review
#3
Stefan Acosta, Martin Björck, Ulf Petersson
BACKGROUND: The aim of this paper was to review the literature on vacuum-assisted wound closure and mesh-mediated fascial traction (VAWCM) in open abdomen therapy. It was designed as systematic review of observational studies. METHODS: A Pub Med, EMBASE and Cochrane search from 2007/01-2016/07 was performed combining the Medical Subject Headings "vacuum", "mesh-mediated fascial traction", "temporary abdominal closure", "delayed abdominal closure", "open abdomen", "abdominal compartment syndrome", "negative pressure wound therapy" or "vacuum assisted wound closure"...
2017: Anaesthesiology Intensive Therapy
https://www.readbyqxmd.com/read/28465431/vimentin-fibers-orient-traction-stress
#4
Nancy Costigliola, Liya Ding, Christoph J Burckhardt, Sangyoon J Han, Edgar Gutierrez, Andressa Mota, Alex Groisman, Timothy J Mitchison, Gaudenz Danuser
The intermediate filament vimentin is required for cells to transition from the epithelial state to the mesenchymal state and migrate as single cells; however, little is known about the specific role of vimentin in the regulation of mesenchymal migration. Vimentin is known to have a significantly greater ability to resist stress without breaking in vitro compared with actin or microtubules, and also to increase cell elasticity in vivo. Therefore, we hypothesized that the presence of vimentin could support the anisotropic mechanical strain of single-cell migration...
May 16, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28382564/intensive-care-and-health-outcomes-of-open-abdominal-treatment-long-term-results-of-vacuum-assisted-wound-closure-and-mesh-mediated-fascial-traction-vawcm
#5
A Willms, S Schaaf, R Schwab, I Richardsen, C Jänig, D Bieler, B Wagner, C Güsgen
PURPOSE: The study's purpose is to evaluate the long-term outcome after vacuum-assisted wound closure and mesh-mediated fascial traction (VAWCM) and to identify predictors of quality of life associated with intensive care. METHODS: Fifty-five patients who underwent open abdomen management at our institution from 2006 to 2013 were prospectively enrolled in this study. After a median follow-up period of 3.8 years, 27 patients completed the 36-Item Short Form Survey (SF-36) quality of life questionnaire...
May 2017: Langenbeck's Archives of Surgery
https://www.readbyqxmd.com/read/28338592/open-abdomen-with-vacuum-assisted-wound-closure-and-mesh-mediated-fascial-traction-in-patients-with-complicated-diffuse-secondary-peritonitis-a-single-center-8-year-experience
#6
Matti Tolonen, Panu Mentula, Ville Sallinen, Suvi Rasilainen, Minna Bäcklund, Ari Leppäniemi
BACKGROUND: Open abdomen (OA) treatment in patients with peritonitis is increasing worldwide. Various temporary abdominal closure devices are being used. This study included patients with complicated diffuse secondary peritonitis, OA, and vacuum-assisted wound closure and mesh-mediated fascial traction (VAWCM). The aim of this study was to describe mortality and major morbidity in terms of delayed primary fascial closure and enteroatmospheric fistula rates. METHODS: This was a single-academic-center retrospective study of consecutive patients with diffuse peritonitis, OA, and VAWCM between years 2008 and 2016...
June 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/28294574/phase-field-boundary-conditions-for-the-voxel-finite-cell-method-surface-free-stress-analysis-of-ct-based-bone-structures
#7
L H Nguyen, S K F Stoter, T Baum, J S Kirschke, M Ruess, Z Yosibash, D Schillinger
The voxel finite cell method employs unfitted finite element meshes and voxel quadrature rules to seamlessly transfer CT data into patient-specific bone discretizations. The method, however, still requires the explicit parametrization of boundary surfaces to impose traction and displacement boundary conditions, which constitutes a potential roadblock to automation. We explore a phase-field based formulation for imposing traction and displacement constraints in a diffuse sense. Its essential component is a diffuse geometry model generated from metastable phase-field solutions of the Allen-Cahn problem that assumes the imaging data as initial condition...
March 11, 2017: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/28293789/development-of-an-ovine-model-for-training-in-vaginal-surgery-for-pelvic-organ-prolapse
#8
A Mansoor, S Curinier, S Campagne-Loiseau, L Platteeuw, B Jacquetin, B Rabischong
INTRODUCTION AND HYPOTHESIS: This aim of this study was to evaluate the feasibility and usefulness of an ovine model for training in vaginal surgery. METHODS: Four senior urogynaecological surgeons and five residents attended five sessions of vaginal surgery for pelvic organ prolapse (POP) in five old multiparous female sheep. Urogynaecological examinations were performed and measurements similar to the POP-Q classification in humans were obtained. Standard POP surgical procedures with and without mesh were performed...
March 14, 2017: International Urogynecology Journal
https://www.readbyqxmd.com/read/28265733/major-complex-abdominal-wall-repair-in-contaminated-fields-with-use-of-a-non-cross-linked-biologic-mesh-a-dual-institutional-experience
#9
J J Atema, E J Furnée, Y Maeda, J Warusavitarne, P J Tanis, W A Bemelman, C J Vaizey, M A Boermeester
BACKGROUND: Data on the use of biologic mesh in abdominal wall repair in complex cases remain sparse. Aim of this study was to evaluate a non-cross-linked porcine acellular dermal matrix for repair of complex contaminated abdominal wall defects. METHODS: Retrospective observational cohort study of consecutive patients undergoing abdominal wall repair with use of Strattice™ Reconstructive Tissue Matrix (LifeCell Corporation, Oxford, UK) between January 2011 and February 2015 at two National Intestinal Failure Units...
August 2017: World Journal of Surgery
https://www.readbyqxmd.com/read/28191788/full-thickness-skin-mesh-graft-vaginoplasty-a-skin-sparing-technique
#10
Guilherme Lang Motta, Patric Machado Tavares, Gabriel Veber Moisés Silva, Milton Berger, Brasil Silva Neto, Tiago Elias Rosito
INTRODUCTION: The ideal vaginoplasty method should promote good cosmetic and functional results with low morbidity. We describe a new technique for congenital vaginal agenesis using a full-thickness perforated skin graft. MATERIALS AND METHODS: We report an 18 year old patient with vaginal agenesis (Morris syndrome) that undergone a modified version of McIndoe vaginoplasty. Patient is set in a low lithotomy position and lateral traction sutures are placed in labia and a 16Fr urethral catheter inserted...
January 27, 2017: International Braz J Urol: Official Journal of the Brazilian Society of Urology
https://www.readbyqxmd.com/read/28107224/abdominal-sepsis
#11
Quirine J J Boldingh, Fleur E E de Vries, Marja A Boermeester
PURPOSE OF REVIEW: To summarize the recent evidence on the treatment of abdominal sepsis with a specific emphasis on the surgical treatment. RECENT FINDINGS: A multitude of surgical approaches towards abdominal sepsis are practised. Recent evidence shows that immediate closure of the abdomen has a better outcome. A short course of antibiotics has a similar effect as a long course of antibiotics in patients with intra-abdominal infection without severe sepsis. SUMMARY: Management of abdominal sepsis requires a multidisciplinary approach...
April 2017: Current Opinion in Critical Care
https://www.readbyqxmd.com/read/27941356/abdominal-compartment-syndrome-and-the-open-abdomen-any-unresolved-issues
#12
Michael Sugrue
PURPOSE OF REVIEW: This article reviews the key principles of abdominal compartment syndrome and the open abdomen, exploring some of the unresolved issues. It reviews new concepts in care. RECENT FINDINGS: Recent use of peritoneal resuscitation, and benefits of mesh-mediated traction are discussed. Abdominal compartment syndrome remains a result of complex interaction between general haemorrhage, sepsis and fluid resuscitation. Improved resuscitation and sepsis control has decreased but not abolished the need for the open abdomen and progression for abdominal compartment syndrome...
February 2017: Current Opinion in Critical Care
https://www.readbyqxmd.com/read/27901277/negative-pressure-wound-therapy-for-prevention-and-treatment-of-surgical-site-infections-after-vascular-surgery
#13
REVIEW
S Acosta, M Björck, A Wanhainen
BACKGROUND: Indications for negative-pressure wound therapy (NPWT) in vascular surgical patients are expanding. The aim of this review was to outline the evidence for NPWT on open and closed wounds. METHODS: A PubMed, EMBASE and Cochrane Library search from 2007 to June 2016 was performed combining the medical subject headings terms 'wound infection', 'abdominal aortic aneurysm (AAA)', 'fasciotomy', 'vascular surgery' and 'NPWT' or 'VAC'. RESULTS: NPWT of open infected groin wounds was associated with shorter duration of wound healing by 47 days, and was more cost-effective than alginate dressings in one RCT...
January 2017: British Journal of Surgery
https://www.readbyqxmd.com/read/27708757/measuring-cellular-traction-forces-on-non-planar-substrates
#14
Jérôme R D Soiné, Nils Hersch, Georg Dreissen, Nico Hampe, Bernd Hoffmann, Rudolf Merkel, Ulrich S Schwarz
Animal cells use traction forces to sense the mechanics and geometry of their environment. Measuring these traction forces requires a workflow combining cell experiments, image processing and force reconstruction based on elasticity theory. Such procedures have already been established mainly for planar substrates, in which case one can use the Green's function formalism. Here we introduce a workflow to measure traction forces of cardiac myofibroblasts on non-planar elastic substrates. Soft elastic substrates with a wave-like topology were micromoulded from polydimethylsiloxane and fluorescent marker beads were distributed homogeneously in the substrate...
October 6, 2016: Interface Focus
https://www.readbyqxmd.com/read/27601035/abdominal-wall-integrity-after-open-abdomen-long-term-results-of-vacuum-assisted-wound-closure-and-mesh-mediated-fascial-traction-vawcm
#15
A Willms, S Schaaf, R Schwab, I Richardsen, D Bieler, B Wagner, C Güsgen
PURPOSE: The open abdomen has become a standard technique in the management of critically ill patients undergoing surgery for severe intra-abdominal conditions. Negative pressure and mesh-mediated fascial traction are commonly used and achieve low fistula rates and high fascial closure rates. In this study, long-term results of a standardised treatment approach are presented. METHODS: Fifty-five patients who underwent OA management for different indications at our institution from 2006 to 2013 were enrolled...
December 2016: Hernia: the Journal of Hernias and Abdominal Wall Surgery
https://www.readbyqxmd.com/read/27551925/international-consensus-conference-on-open-abdomen-in-trauma
#16
REVIEW
Osvaldo Chiara, Stefania Cimbanassi, Walter Biffl, Ari Leppaniemi, Sharon Henry, Thomas M Scalea, Fausto Catena, Luca Ansaloni, Arturo Chieregato, Elvio de Blasio, Giorgio Gambale, Giovanni Gordini, Guiseppe Nardi, Pietro Paldalino, Francesco Gossetti, Paolo Dionigi, Giuseppe Noschese, Gregorio Tugnoli, Sergio Ribaldi, Sebastian Sgardello, Stefano Magnone, Stefano Rausei, Anna Mariani, Francesca Mengoli, Salomone di Saverio, Maurizio Castriconi, Federico Coccolini, Joseph Negreanu, Salvatore Razzi, Carlo Coniglio, Francesco Morelli, Maurizio Buonanno, Monica Lippi, Liliana Trotta, Annalisa Volpi, Luca Fattori, Mauro Zago, Paolo de Rai, Fabrizio Sammartano, Roberto Manfredi, Emiliano Cingolani
BACKGROUND: A part of damage-control laparotomy is to leave the fascial edges and the skin open to avoid abdominal compartment syndrome and allow further explorations. This condition, known as open abdomen (OA), although effective, is associated with severe complications. Our aim was to develop evidence-based recommendations to define indications for OA, techniques for temporary abdominal closure, management of enteric fistulas, and methods of definitive wall closure. METHODS: The literature from 1990 to 2014 was systematically screened according to PRISMA [Preferred Reporting Items for Systematic Reviews and Meta-analyses] protocol...
January 2016: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/27547691/retrospective-analysis-of-a-vacm-vacuum-assisted-closure-and-mesh-mediated-fascial-traction-treatment-manual-for-temporary-abdominal-wall-closure-results-of-58-consecutive-patients
#17
Christian Beltzer, Alexander Eisenächer, Steffen Badendieck, Dietrich Doll, Markus Küper, Stefan Lenz, Björn Dirk Krapohl
INTRODUCTION: The optimal treatment concept for temporary abdominal closure (TAC) in critically ill visceral surgery patients with open abdomen (OA) continues to be unclear. The VACM (vacuum-assisted closure and mesh-mediated fascial traction) therapy seems to permit higher delayed primary fascial closure rates (FCR) than other TAC procedures. MATERIAL AND METHODS: Patients of our clinic (n=58) who were treated by application of a VAC/VACM treatment manual in the period from 2005 to 2008 were retrospectively analysed...
2016: GMS Interdisciplinary Plastic and Reconstructive Surgery DGPW
https://www.readbyqxmd.com/read/27541031/open-abdomen-treated-with-negative-pressure-wound-therapy-indications-management-and-survival
#18
A Seternes, L C Rekstad, S Mo, P Klepstad, D L Halvorsen, T Dahl, M Björck, A Wibe
BACKGROUND: Open abdomen treatment (OAT) is a significant burden for patients and is associated with considerable mortality. The primary aim of this study was to report survival and cause of mortality after OAT. Secondary aims were to evaluate length of stay (LOS) in intensive care unit (ICU) and in hospital, time to abdominal closure and major complications. METHODS: Retrospective review of prospectively registered patients undergoing OAT between October 2006 and June 2014 at Trondheim University Hospital, Norway...
January 2017: World Journal of Surgery
https://www.readbyqxmd.com/read/27528695/greater-success-of-primary-fascial-closure-of-the-open-abdomen-a-retrospective-study-analyzing-applied-surgical-techniques-success-of-fascial-closure-and-variables-affecting-the-results
#19
M Kääriäinen, M Kuuskeri, M Helminen, H Kuokkanen
BACKGROUND AND AIMS: The open abdomen technique is a standard procedure in the treatment of intra-abdominal catastrophe. Achieving primary abdominal closure within the initial hospitalization is a main objective. This study aimed to analyze the success of closure rate and the effect of negative pressure wound therapy, mesh-mediated medial traction, and component separation on the results. We present the treatment algorithm used in our institution in open abdomen situations based on these findings...
June 2017: Scandinavian Journal of Surgery: SJS
https://www.readbyqxmd.com/read/27324880/quality-of-life-and-hernia-development-5-years-after-open-abdomen-treatment-with-vacuum-assisted-wound-closure-and-mesh-mediated-fascial-traction
#20
U Petersson, T Bjarnason, M Björck, A Montgomery, P Rogmark, M Svensson, K Sörelius, S Acosta
PURPOSE: To report incisional hernia (IH) incidence, abdominal wall (AW) discomfort and quality of life (QoL) 5 years after open abdomen treatment with vacuum-assisted wound closure and mesh-mediated fascial traction (VAWCM). METHODS: Five-year follow-up of patients included in a prospective study 2006-2009. The protocol included physical examination, patient interview, chart review, questionnaires on abdominal wall and stoma complaints and the SF-36 questionnaire...
October 2016: Hernia: the Journal of Hernias and Abdominal Wall Surgery
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