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https://www.readbyqxmd.com/read/28318830/long-term-outcome-of-the-gore-excluder-aaa-endoprosthesis-for-treatment-of-infrarenal-aortic-aneurysms
#1
Claire G Poublon, Suzanne Holewijn, Steven M M van Sterkenburg, Ignace F J Tielliu, Clark J Zeebregts, Michel M P J Reijnen
PURPOSE: To evaluate long-term outcome of GORE EXCLUDER AAA Endoprosthesis (W.L. Gore & Associates, Inc, Flagstaff, Arizona) for elective treatment of infrarenal aortic aneurysms and to evaluate performance of different generations of the device. MATERIALS AND METHODS: A retrospective analysis was performed of 248 patients undergoing elective endovascular aneurysm repair with the GORE EXCLUDER between January 2000 and December 2015 in 2 hospitals. Primary endpoint was reintervention-free survival...
March 15, 2017: Journal of Vascular and Interventional Radiology: JVIR
https://www.readbyqxmd.com/read/28318378/pexophagy-is-responsible-for-65-of-cases-of-peroxisome-biogenesis-disorders
#2
Taras Y Nazarko
Peroxisome biogenesis disorders (PBDs) is a group of diseases caused by mutations in one of the peroxins, proteins responsible for biogenesis of the peroxisomes. In recent years, it became clear that many peroxins (e.g., PEX3 and PEX14) play additional roles in peroxisome homeostasis (such as promoting autophagic degradation of peroxisomes or pexophagy), which are often opposite to their originally established functions in peroxisome formation and maintenance. Even more interesting, the peroxins that make up the peroxisomal AAA ATPase complex (AAA-complex) in yeast (Pex1, Pex6 and Pex15) or mammals (PEX1, PEX6, PEX26) are responsible for the downregulation of pexophagy...
February 28, 2017: Autophagy
https://www.readbyqxmd.com/read/28317478/homocysteine-and-non-cardiac-vascular-disease
#3
Niki Katsiki, Pablo Perez-Martinez, Dimitri P Mikhailidis
Elevated homocysteine (Hcy) levels are predictors of cardiovascular disease (CVD). Hyperhomocysteinemia has also been associated with total and CVD mortality. However, whether Hcy is just a marker or plays a causal role in CVD remains to be elucidated. In this narrative review, we discuss the associations between Hcy and non-cardiac vascular diseases, namely stroke, peripheral artery disease (PAD), carotid artery disease, chronic kidney disease (CKD), atherosclerotic renal artery stenosis (ARAS), abdominal aortic aneurysm (AAA) and erectile dysfunction (ED)...
March 17, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28317312/evaluation-of-dose-calculation-accuracy-of-treatment-planning-systems-at-hip-prosthesis-interfaces
#4
David Paulu, Parham Alaei
There are an increasing number of radiation therapy patients with hip prosthesis. The common method of minimizing treatment planning inaccuracies is to avoid radiation beams to transit through the prosthesis. However, the beams often exit through them, especially when the patient has a double-prosthesis. Modern treatment planning systems employ algorithms with improved dose calculation accuracies but even these algorithms may not predict the dose accurately at high atomic number interfaces. The current study evaluates the dose calculation accuracy of three common dose calculation algorithms employed in two commercial treatment planning systems...
March 20, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28314974/health-related-quality-of-life-prospectively-evaluated-by-the-8-item-short-form-after-endovascular-repair-versus-open-surgery-for-abdominal-aortic-aneurysms
#5
Takayoshi Kato, Mototsugu Tamaki, Tomohiro Tsunekawa, Yusuke Motoji, Akihiro Hirakawa, Yasuhide Okawa, Shinji Tomita
Open repair for infra-renal abdominal aortic and iliac artery aneurysms (AAAs) is a robust treatment. On the other hand, endovascular aneurysm repair (EVAR) has been widespread because of its less invasiveness. However, patients after EVAR frequently require postoperative radiographic examinations and may feel anxiety for their endoleaks. We prospectively evaluated Health-related Quality of Life of the patients with these two fashions using the 8-item Short Form (SF-8). From 2011 to 2013, 89 consecutive elective cases of AAAs were treated...
March 17, 2017: Heart and Vessels
https://www.readbyqxmd.com/read/28303975/a-conserved-inter-domain-communication-mechanism-regulates-the-atpase-activity-of-the-aaa-protein-drg1
#6
Michael Prattes, Mathias Loibl, Gertrude Zisser, Daniel Luschnig, Lisa Kappel, Ingrid Rössler, Manuela Grassegger, Altijana Hromic, Elmar Krieger, Karl Gruber, Brigitte Pertschy, Helmut Bergler
AAA-ATPases fulfil essential roles in different cellular pathways and often act in form of hexameric complexes. Interaction with pathway-specific substrate and adaptor proteins recruits them to their targets and modulates their catalytic activity. This substrate dependent regulation of ATP hydrolysis in the AAA-domains is mediated by a non-catalytic N-terminal domain. The exact mechanisms that transmit the signal from the N-domain and coordinate the individual AAA-domains in the hexameric complex are still the topic of intensive research...
March 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28302917/hif1%C3%AE-in-aortic-aneurysms-and-beyond
#7
Tomoki Hashimoto, Victor Rizzo
Abdominal aortic aneurysm (AAA) is a permanent expansion of the vessel wall with a high prevalence in those 65 years of age and older. Aneurysms are prone to dissection and rupture that carry a mortality rate of over 85%. Currently, surgical repair is the only option to treat this disease. The need to intervene prior to these events has set off a flurry of basic studies in an effort to understand the cellular and molecular mechanisms that govern AAA formation, progression and rupture. In the present study, the role of myeloid cells in contributing to AAA development has been confirmed...
April 1, 2017: Clinical Science (1979-)
https://www.readbyqxmd.com/read/28302476/the-protective-effects-of-diabetes-mellitus-on-post-evar-aaa-growth-and-reinterventions
#8
Chien Yi M Png, Rami O Tadros, Ming Kang, William E Beckerman, Melissa L Tardiff, Ageliki G Vouyouka, Michael L Marin, Peter L Faries
INTRODUCTION AND OBJECTIVE: This study aims to investigate the effect of diabetes on post-endovascular aneurysm repairs (EVAR) of abdominal aortic aneurysms (AAA). METHODS: 1479 consecutive patients who underwent AAA EVAR were reviewed. The cohorts were divided based on their diabetes status and compared. Preoperative demographic and comorbidity data were analyzed using t-test and Chi-squared test while post-EVAR outcomes were analyzed using Probit multivariate model, followed by Kaplan Meier survival curve and Cox regression...
March 13, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28302475/safety-and-effectiveness-of-a-percutaneous-first-approach-to-endovascular-aortic-aneurysm-repair
#9
Christopher Agrusa, Andrew Meltzer, Darren Schneider, Peter Connolly
BACKGROUND: Percutaneous endovascular aneurysm repair (PEVAR) has been increasingly employed in the endovascular treatment of abdominal aortic aneurysms. Furthermore, the percutaneous approach can be used with minimal sedation and local anesthesia in the majority of cases. The purpose of this study is to assess the safety and effectiveness of a "percutaneous first" approach to femoral access for EVAR. METHOD: From 2012 to 2014, PEVAR has been the preferred approach to femoral access for EVAR at our institution...
March 13, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28297459/on-the-use-of-a-convolution-superposition-algorithm-for-plan-checking-in-lung-stereotactic-body-radiation-therapy
#10
Nicholas Hardcastle, Bradley M Oborn, Annette Haworth
Stereotactic body radiation therapy (SBRT) aims to deliver a highly conformal ablative dose to a small target. Dosimetric verification of SBRT for lung tumors presents a challenge due to heterogeneities, moving targets, and small fields. Recent software (M3D) designed for dosimetric verification of lung SBRT treatment plans using an advanced convolution-superposition algorithm was evaluated. Ten lung SBRT patients covering a range of tumor volumes were selected. 3D CRT plans were created using the XiO treatment planning system (TPS) with the superposition algorithm...
September 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28297432/difference-in-dose-volumetric-data-between-the-analytical-anisotropic-algorithm-the-dose-to-medium-and-the-dose-to-water-reporting-modes-of-the-acuros-xb-for-lung-stereotactic-body-radiation-therapy
#11
Wambaka A Mampuya, Mitsuhiro Nakamura, Yoshinori Hirose, Takashi Ishigaki, Takashi Mizowaki, Masahiro Hiraoka
The purpose of this study was to evaluate the difference in dose-volumetric data between the analytical anisotropic algorithms (AAA) and the two dose reporting modes of the Acuros XB, namely, the dose to water (AXB-Dw) and dose to medium (AXB-Dm) in lung stereotactic body radiotherapy (SBRT). Thirty-eight plans were generated using the AXB-Dm in Eclipse Treatment Planning System (TPS) and then recalculated with the AXB-Dw and AAA, using identical beam setup. A dose of 50 Gy in 4 fractions was prescribed to the isocenter and the planning target volume (PTV) D95%...
September 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28297335/on-the-accuracy-of-dose-prediction-near-metal-fixation-devices-for-spine-sbrt
#12
Zhangkai J Cheng, Regina M Bromley, Brad Oborn, Martin Carolan, Jeremy T Booth
The metallic fixations used in surgical procedures to support the spine mechanically usually consist of high-density materials. Radiation therapy to palliate spinal cord compression can include prophylactic inclusion of potential tumor around the site of such fixation devices. Determination of the correct density and shape of the spine fixation device has a direct effect on the dose calculation of the radiation field. Even with the application of modern computed tomography (CT), under- or overestimation of dose, both immediately next to the device and in the surrounding tissues, can occur due to inaccuracies in the dose prediction algorithm...
May 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28296545/the-effects-of-nicotine-administration-on-the-pathophysiology-of-rat-aortic-wall
#13
H Kugo, N Zaima, H Tanaka, T Urano, N Unno, T Moriyama
Abdominal aortic aneurysm (AAA) is the progressive dilation of the abdominal aorta. Nicotine is reported to be associated with the development and rupture of AAA, but the pathological effects of nicotine on normal rat aorta have not been determined. We investigated pathological changes in the aortic wall of rats caused by the administration of nicotine. Nicotine administration weakened the vascular wall, increased gelatinolytic activity and promoted the destruction of elastin and collagen in the rat abdominal aorta...
2017: Biotechnic & Histochemistry: Official Publication of the Biological Stain Commission
https://www.readbyqxmd.com/read/28296355/biosensor-enabled-directed-evolution-to-improve-muconic-acid-production-in-saccharomyces-cerevisiae
#14
John M Leavitt, James M Wagner, Cuong Chi Tu, Alice Tong, Yanyi Liu, Hal S Alper
Muconic acid is a valuable platform chemical with potential applications in the production of polymers such as nylon and polyethylene terephthalate (PET). The conjugate base, muconate, was previously biosynthesized in the bacterial host Escherichia coli. Significant pathway engineering led to the first reported instance of rationally engineered production of muconic acid in the yeast Saccharomyces cerevisiae. To further increase muconic acid production in this host, we employed an adaptive laboratory evolution (ALE) strategy to complement rational metabolic engineering...
March 10, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/28296305/on-flattening-filter-free-portal-dosimetry
#15
Eduardo Pardo, Juan Castro Novais, María Yolanda Molina López, Sheila Ruiz Maqueda
Varian introduced (in 2010) the option of removing the flattening filter (FF) in their C-Arm linacs for intensity-modulated treatments. This mode, called flattening filter-free (FFF), offers the advantage of a greater dose rate. Varian's "Portal Dosimetry" is an electronic portal imager device (EPID)-based tool for IMRT verification. This tool lacks the capability of verifying flattening filter-free (FFF) modes due to saturation and lack of an image prediction algorithm. (Note: the latest versions of this software and EPID correct these issues...
July 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28293558/the-copper-efflux-regulator-cuer-is-subject-to-atp-dependent-proteolysis-in-escherichia-coli
#16
Lisa-Marie Bittner, Alexander Kraus, Sina Schäkermann, Franz Narberhaus
The trace element copper serves as cofactor for many enzymes but is toxic at elevated concentrations. In bacteria, the intracellular copper level is maintained by copper efflux systems including the Cue system controlled by the transcription factor CueR. CueR, a member of the MerR family, forms homodimers, and binds monovalent copper ions with high affinity. It activates transcription of the copper tolerance genes copA and cueO via a conserved DNA-distortion mechanism. The mechanism how CueR-induced transcription is turned off is not fully understood...
2017: Frontiers in Molecular Biosciences
https://www.readbyqxmd.com/read/28291487/physical-screening-predictors-for-success-in-completing-air-force-phase-ii-air-liaison-officer-aptitude-assessment
#17
John Christopher McGee, Eric Wilson, Haley Barela, Sharon Blum
OBJECTIVES: Air Liaison Officer Aptitude Assessment (AAA) attrition is often associated with a lack of candidate physical preparation. The Functional Movement Screen, Tactical Fitness Assessment, and fitness metrics were collected (n = 29 candidates) to determine what physical factors could predict a candidate s success in completing AAA. METHODS: Between-group comparisons were made between candidates completing AAA versus those who did not (p < 0.05). Upper 50% thresholds were established for all variables with R(2) < 0...
March 2017: Military Medicine
https://www.readbyqxmd.com/read/28289424/secondary-effects-of-glyphosate-action-in-phelipanche-aegyptiaca-inhibition-of-solute-transport-from-the-host-plant-to-the-parasite
#18
Tal Shilo, Baruch Rubin, Dina Plakhine, Shira Gal, Rachel Amir, Yael Hacham, Shmuel Wolf, Hanan Eizenberg
It is currently held that glyphosate efficiently controls the obligate holoparasite Phelipanche aegyptiaca (Egyptian broomrape) by inhibiting its endogenous shikimate pathway, thereby causing a deficiency in aromatic amino acids (AAA). While there is no argument regarding the shikimate pathway being the primary site of the herbicide's action, the fact that the parasite receives a constant supply of nutrients, including proteins and amino acids, from the host does not fit with an AAA deficiency. This apparent contradiction implies that glyphosate mechanism of action in P...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28288890/abdominal-aortic-aneurysm-associated-microrna-516a-5p-regulates-expressions-of-methylenetetrahydrofolate-reductase-matrix-metalloproteinase-2-and-tissue-inhibitor-of-matrix-metalloproteinase-1-in-human-abdominal-aortic-vascular-smooth-muscle-cells
#19
Crystal Yin Tung Chan, Bernice Lai Yee Cheuk, Stephen Wing Keung Cheng
OBJECTIVE: MicroRNAs (miRNAs or miRs) have been highlighted to be involved in abdominal aortic aneurysm (AAA) with the emergence of recent miRNA microarray profiling studies. miR-516a-5p has been shown to be significantly overexpressed in vascular smooth muscle cells (VSMCs) from human AAA tissues from our previous microarray study, suggesting its crucial association with AAA. In addition, further bioinformatics analysis predicted methylenetetrahydrofolate reductase (MTHFR), which regulates homocysteine (Hcy) metabolism and is proposed to be a risk gene for AAA formation, to be the down-regulation target of miR-516a-5p...
March 10, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28288889/cardiac-stress-testing-during-workup-for-abdominal-aortic-aneurysm-repair-is-not-associated-with-improved-patient-outcomes
#20
Benjamin S Brooke, Mark R Sarfati, Yingying Zhang, Yue Zhang, Angela P Presson, Tom H Greene, Larry W Kraiss
BACKGROUND: Cardiac stress testing (CST) is commonly used to help determine whether patients with abdominal aortic aneurysms (AAA) are better candidates for open vs. endovascular repair, although it is unknown whether use of CST achieves its goal of optimizing patient selection and postoperative outcomes. METHODS: We retrospectively identified 3,635 patients in the Vascular Quality Initiative (VQI) database (2010- 2012) with an AAA ≥ 5.0cm who were candidates for either open or endovascular AAA repair...
March 10, 2017: Annals of Vascular Surgery
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