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https://www.readbyqxmd.com/read/29151117/risks-of-flexible-ureterorenoscopy-pathophysiology-and-prevention
#1
REVIEW
Palle J S Osther
Currently, indications for flexible ureterorenoscopy (fURS) are expanding, mainly due to technological advancements. Although data from clinical series definitely presents fURS as a safe procedure, serious complications including sepsis and ureteral lesions do occur. These complications seem to be a result of the unique elements of fURS, ureteral access and irrigation, pushing normal upper urinary tract physiology into pathophysiological processes, including intrarenal/pyelo-veneous backflow and ureteral contractions, potentially resulting in septic, haemorrhagic and ureteral lesional complications...
November 18, 2017: Urolithiasis
https://www.readbyqxmd.com/read/29138631/sarc006-phase-ii-trial-of-chemotherapy-in-sporadic-and-neurofibromatosis-type-1-associated-chemotherapy-naive-malignant-peripheral-nerve-sheath-tumors
#2
Christine S Higham, Seth M Steinberg, Eva Dombi, Arie Perry, Lee J Helman, Scott M Schuetze, Joseph A Ludwig, Arthur Staddon, Mohammed M Milhem, Daniel Rushing, Robin L Jones, Michael Livingston, Stewart Goldman, Christopher Moertel, Lars Wagner, David Janhofer, Christina M Annunziata, Denise Reinke, Lauren Long, David Viskochil, Larry Baker, Brigitte C Widemann
Background: Worse chemotherapy response for neurofibromatosis type 1- (NF1-) associated compared to sporadic malignant peripheral nerve sheath tumors (MPNST) has been reported. Methods: We evaluated the objective response (OR) rate of patients with AJCC Stage III/IV chemotherapy-naive NF1 MPNST versus sporadic MPNST after 4 cycles of neoadjuvant chemotherapy, 2 cycles of ifosfamide/doxorubicin, and 2 cycles of ifosfamide/etoposide. A Simon optimal two-stage design was used (target response rate 40%)...
2017: Sarcoma
https://www.readbyqxmd.com/read/29127261/shortroot-mediated-increase-in-stomatal-density-has-no-impact-on-photosynthetic-efficiency
#3
Mara L Schuler, Olga V Sedelnikova, Berkley J Walker, Peter Westhoff, Jane A Langdale
The co-ordinated positioning of veins, mesophyll cells and stomata across a leaf is crucial for efficient gas exchange and transpiration, and therefore for overall function. In monocot leaves, stomatal cell files are positioned at the flanks of underlying longitudinal leaf veins, rather than directly above or below. This pattern suggests either that stomatal formation is inhibited in epidermal cells directly in contact with the vein, or that specification is induced in cells files beyond the vein. The SHORTROOT pathway specifies distinct cell-types around the vasculature in sub-epidermal layers of both root and shoots, with cell-type identity determined by distance from the vein...
November 10, 2017: Plant Physiology
https://www.readbyqxmd.com/read/29063245/transparenchymal-glissonean-approach-a-novel-surgical-technique-for-advanced-perihilar-bile-duct-cancer
#4
Hirofumi Kamachi, Toshiya Kamiyama, Yousuke Tsuruga, Tatsuya Orimo, Kenji Wakayama, Shingo Shimada, Tatsuhiko Kakisaka, Hideki Yokoo, Kenichiro Yamashita, Akinobu Taketomi
PURPOSE: To increase the surgical opportunities for locally advanced perihilar bile duct cancers that require left-sided hepatectomies, we developed the transparenchymal glissonean approach (TGA); it comprises intra-hepatic exposure and dissection of the Glisson's sheath to gain access to the hepatic artery and portal vein for reconstruction. METHODS: Following skeletonization of the hepatoduodenal ligament, the proximal portions of invaded vessels are exposed. If extra-hepatic attempts to access the distal portions of the invaded vessels fail, TGA can be used...
October 23, 2017: Langenbeck's Archives of Surgery
https://www.readbyqxmd.com/read/29036977/-safety-and-feasibility-of-sheathless-transfemoral-aortic-valve-implantation
#5
H J Pei, S Y Teng, T Luo, Y J Wu, Y J Yang, S B Qiao, B Xu, R L Gao
Objective: To investigate the safety and feasibility of sheathless transfemoral aortic valve replacement (TAVR). Methods: In this prospective study, we enrolled 23 patients with severe aortic stenosis (AS) who were inoperable or at high-risk for surgical aortic valve replacement operation in Fuwai hospital From September 2012 to June 2015. Multislice spiral CT and angiography of femoral artery showed that all patients had minimal femoral artery diameters (<6.5 mm) and severe calcification which was not suitable for transfemoral TAVR through sheath...
September 24, 2017: Zhonghua Xin Xue Guan Bing za Zhi
https://www.readbyqxmd.com/read/28941480/a-double-crossover-technique-in-an-obese-patient-undergoing-transfemoral-transcatheter-aortic-valve-implantation-how-to-accomplish-hemostasis-percutaneously
#6
Hirokazu Onishi, Toru Naganuma, Sunao Nakamura
Percutaneous transfemoral transcatheter aortic valve implantation (TF-TAVI) is generally an acceptable procedure but may be associated with vascular complications at femoral access sites, particularly in obese patients. This report aimed to describe a case of successful performance of our "double crossover technique" in an obese patient undergoing TF-TAVI with a percutaneous transfemoral intra-aortic balloon pump (TF-IABP). A 75-year-old man presented with heart failure due to a left ventricular ejection fraction of 35% and low-flow, low-gradient severe aortic stenosis...
September 2017: Cardiovascular Revascularization Medicine: Including Molecular Interventions
https://www.readbyqxmd.com/read/28837613/impact-of-sheath-diameter-of-different-sheath-types-on-vascular-complications-and-mortality-in-transfemoral-tavi-approaches-using-the-proglide-closure-device
#7
Zisis Dimitriadis, Werner Scholtz, Stephan M Ensminger, Cornelia Piper, Thomas Bitter, Marcus Wiemer, Marios Vlachojannis, Jochen Börgermann, Lothar Faber, Dieter Horstkotte, Jan Gummert, Smita Scholtz
OBJECTIVE: Evaluation of the impact of the sheath diameter on vascular complications and mortality in transfemoral aortic valve implantation. METHOD: Between 2012 and 2014, 183 patients underwent the procedure using a sheath diameter of 18-24 F. This collective was divided into two groups: group 1, with a sheath diameter of 18F (G1, n = 94), consisted of patients with 18F Medtronic Sentrant and 18 F Direct Flow sheaths, and group 2 with a sheath diameter of 19-24 F (G2, n = 89) consisted of patients with Edwards expandable e-sheath and Solopath sheaths...
2017: PloS One
https://www.readbyqxmd.com/read/28822750/promise-and-pitfalls-of-g-ratio-estimation-with-mri
#8
REVIEW
Jennifer S W Campbell, Ilana R Leppert, Sridar Narayanan, Mathieu Boudreau, Tanguy Duval, Julien Cohen-Adad, G Bruce Pike, Nikola Stikov
The fiber g-ratio is the ratio of the inner to the outer diameter of the myelin sheath of a myelinated axon. It has a limited dynamic range in healthy white matter, as it is optimized for speed of signal conduction, cellular energetics, and spatial constraints. In vivo imaging of the g-ratio in health and disease would greatly increase our knowledge of the nervous system and our ability to diagnose, monitor, and treat disease. MRI based g-ratio imaging was first conceived in 2011, and expanded to be feasible in full brain white matter with preliminary results in 2013...
August 16, 2017: NeuroImage
https://www.readbyqxmd.com/read/28794812/endovascular-management-of-superior-mesenteric-artery-sma-aneurysm-adequate-access-is-essential-for-success-case-report
#9
Lovro Tkalčić, Berislav Budiselić, Miljenko Kovačević, Siniša Knežević, Slavica Kovačić, Damir Miletić, Vjekoslav Tomulić, Dimitrij Kuhelj
BACKGROUND: An aneurysm of the superior mesenteric artery (SMA) with a diameter of 2.2 cm was found incidentally on an ultrasound (US) examination in a 26-year-old woman. The only known risk factor was an intracranial aneurysm that was found on her grandmother's autopsy. Based on pregnancy planning and the current literature, endovascular management with a covered stent was proposed. CASE REPORT: Self-expandable, covered stent (Bard, Fluency(®)) was implanted using a single transfemoral approach...
2017: Polish Journal of Radiology
https://www.readbyqxmd.com/read/28696222/zhoupi-and-kerberos-mediate-embryo-endosperm-separation-by-promoting-the-formation-of-an-extracuticular-sheath-at-the-embryo-surface
#10
Steven Moussu, Nicolas M Doll, Sophy Chamot, Lysiane Brocard, Audrey Creff, Chloé Fourquin, Thomas Widiez, Zachary L Nimchuk, Gwyneth Ingram
Arabidopsis thaliana seed development requires the concomitant development of two zygotic compartments, the embryo and the endosperm. Following fertilization, the endosperm expands and the embryo grows invasively through the endosperm, which breaks down. Here, we describe a structure we refer to as the embryo sheath that forms on the surface of the embryo as it starts to elongate. The sheath is deposited outside the embryonic cuticle and incorporates endosperm-derived material rich in extensin-like molecules...
July 2017: Plant Cell
https://www.readbyqxmd.com/read/28583735/electromagnetic-tracking-of-flexible-robotic-catheters-enables-assisted-navigation-and-brings-automation-to-endovascular-navigation-in-an-in-vitro-study
#11
Adeline Schwein, Benjamin Kramer, Ponraj Chinnadurai, Neha Virmani, Sean Walker, Marcia O'Malley, Alan B Lumsden, Jean Bismuth
OBJECTIVE: Combining three-dimensional (3D) catheter control with electromagnetic (EM) tracking-based navigation significantly reduced fluoroscopy time and improved robotic catheter movement quality in a previous in vitro pilot study. The aim of this study was to expound on previous results and to expand the value of EM tracking with a novel feature, assistednavigation, allowing automatic catheter orientation and semiautomatic vessel cannulation. METHODS: Eighteen users navigated a robotic catheter in an aortic aneurysm phantom using an EM guidewire and a modified 9F robotic catheter with EM sensors at the tip of both leader and sheath...
June 2, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28548473/initial-experience-with-the-e-ventus%C3%A2-stentgraft-for-endovascular-treatment-of-visceral-artery-aneurysms
#12
Susanne Anton, Erik Stahlberg, Marco Horn, Marcus Wiedner, Markus Kleemann, Joerg Barkhausen, Jan P Goltz
BACKGROUND: To evaluate the safety and efficacy of a novel balloon-expandable stentgraft for endovascular treatment of visceral artery aneurysms (VAA). METHODS: Between 9/2014 and 1/2017 seven patients (69+/-15y) with true (n=4) and false (n=3) VAAs were treated by implantation of balloon-expandable stentgrafts (E-ventus®, Jotec, Germany) using a trans-femoral (n=2) or -brachial (n=5) vascular access. The stentgraft was placed without prior passing of the landing zone with a sheath...
May 26, 2017: Journal of Cardiovascular Surgery
https://www.readbyqxmd.com/read/28544242/percutaneous-thoracic-aortic-aneurysm-repair-through-transcaval-aortic-access
#13
Zaher Fanari, Sumaya Hammami, Nilesh J Goswami, Jeffrey A Goldstein
Transcaval aortic access has been used for deployment of transcatheter aortic valves in patients in whom conventional arterial approaches are not feasible. This access can be vital in other situation when large bore access is needed. We described a case of 65-year-old man who had large thoracic descending aortic aneurysm with diffuse bilateral iliac disease precluding the arterial access required for the procedure. The patient underwent successful transcaval access with placement of 22-Fr balloon expandable sheath followed with successful deployments of 32 mm × 32 mm × 150 mm Valiant stent graft (Medtronic, Minneapolis, MN)...
May 22, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28534029/submucosal-inferior-turbinoplasty-using-a-new-continuous-suction-irrigation-method
#14
Takeo Kanaya, Naoyuki Kohno
INTRODUCTION: Numerous surgical techniques for inferior turbinate hypertrophy (ITH) have been reported, each with advantages and disadvantages. Submucosal turbinoplasty with removal of the bony component of the inferior turbinate (IT) is an excellent procedure to expand the nasal cavity. However, this procedure requires a large incision to remove the inferior turbinate bone (ITB) and is associated with hemorrhage, crust formation, and adhesion. A smaller incision would avoid such complications...
2017: Frontiers in Surgery
https://www.readbyqxmd.com/read/28531236/psychosine-enhances-the-shedding-of-membrane-microvesicles-implications-in-demyelination-in-krabbe-s-disease
#15
Ludovic D'Auria, Cory Reiter, Emma Ward, Ana Lis Moyano, Michael S Marshall, Duc Nguyen, Giuseppe Scesa, Zane Hauck, Richard van Breemen, Maria I Givogri, Ernesto R Bongarzone
In prior studies, our laboratory showed that psychosine accumulates and disrupts lipid rafts in brain membranes of Krabbe's disease. A model of lipid raft disruption helped explaining psychosine's effects on several signaling pathways important for oligodendrocyte survival and differentiation but provided more limited insight in how this sphingolipid caused demyelination. Here, we have studied how this cationic inverted coned lipid affects the fluidity, stability and structure of myelin and plasma membranes...
2017: PloS One
https://www.readbyqxmd.com/read/28500739/feasibility-and-safety-of-transfemoral-sheathless-portico-aortic-valve-implantation-preliminary-results-in-a-single-center-experience
#16
Maurizio Taramasso, Andrea Denegri, Shingo Kuwata, Hans Rickli, Philipp K Haager, Gabor Sütsch, Hector Rodriguez Cetina Biefer, Jan Kottwitz, Fabian Nietlispach, Francesco Maisano
BACKGROUND: Feasibility of transfemoral (TF) transcathteter aortic valve replacement (TAVR) is limited by the smallest diameter, the calcification and tortuosity of the iliofemoral access vessels. The use of the Portico system without delivery sheath results in significantly lower profile delivery system compared to standard technique. We herein report our single center experience, feasibility and safety of such an approach. METHODS: The Portico valve was implanted sheathless in 81 high-risk patients with severe aortic stenosis utilizing percutaneous femoral access...
May 13, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28482354/nose-cone-entrapment-after-transcatheter-aortic-valve-implantation-of-a-corevalve-self-expandable-bioprosthesis
#17
Stylianos A Pyxaras, Luciano Pizzulli, Ulrich Gerckens
: We describe the first reported case of a nose cone entrapment of the delivering catheter of a CoreValve self-expandable valve, during a transcatheter aortic valve implantation procedure. The complication was successfully treated after snaring the cone and retracting the system within the introducing sheath.
December 2016: Journal of Cardiovascular Medicine
https://www.readbyqxmd.com/read/28470148/peroxisomal-dysfunctions-cause-lysosomal-storage-and-axonal-kv1-channel-redistribution-in-peripheral-neuropathy
#18
Sandra Kleinecke, Sarah Richert, Livia de Hoz, Britta Brügger, Theresa Kungl, Ebrahim Asadollahi, Susanne Quintes, Judith Blanz, Rhona McGonigal, Kobra Naseri, Michael W Sereda, Timo Sachsenheimer, Christian Lüchtenborg, Wiebke Möbius, Hugh Willison, Myriam Baes, Klaus-Armin Nave, Celia Michèle Kassmann
Impairment of peripheral nerve function is frequent in neurometabolic diseases, but mechanistically not well understood. Here, we report a novel disease mechanism and the finding that glial lipid metabolism is critical for axon function, independent of myelin itself. Surprisingly, nerves of Schwann cell-specific Pex5 mutant mice were unaltered regarding axon numbers, axonal calibers, and myelin sheath thickness by electron microscopy. In search for a molecular mechanism, we revealed enhanced abundance and internodal expression of axonal membrane proteins normally restricted to juxtaparanodal lipid-rafts...
May 4, 2017: ELife
https://www.readbyqxmd.com/read/28374279/design-analysis-and-testing-of-a-novel-mitral-valve-for-transcatheter-implantation
#19
Selim Bozkurt, Georgia L Preston-Maher, Ryo Torii, Gaetano Burriesci
Mitral regurgitation is a common mitral valve dysfunction which may lead to heart failure. Because of the rapid aging of the population, conventional surgical repair and replacement of the pathological valve are often unsuitable for about half of symptomatic patients, who are judged high-risk. Transcatheter valve implantation could represent an effective solution. However, currently available aortic valve devices are inapt for the mitral position. This paper presents the design, development and hydrodynamic assessment of a novel bi-leaflet mitral valve suitable for transcatheter implantation...
August 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28366701/altering-the-approach-open-minimally-invasive-renal-transplant-in-obese-patients-through-the-anterior-rectus-sheath
#20
Stephen H Phillips, Sharon K Hill, Lorie D Lipscomb, Joseph B Africa
OBJECTIVE: To retrospectively analyze the wound issues for obese renal transplant patients, as well as post-transplant outcomes including graft and patient survival, hypothesizing improvement over the standard approach. As the obese population has expanded, minimally invasive renal transplant techniques have attempted to improve the issues of complications related to wounds and hernias. The anterior rectus sheath approach, which facilitates a minimal incision, has been adopted at our center for all renal transplants, including obese patients...
March 31, 2017: Urology
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