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Vascular stent

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https://www.readbyqxmd.com/read/28208634/rna-eluting-surfaces-for-the-modulation-of-gene-expression-as-a-novel-stent-concept
#1
Olivia Koenig, Diane Zengerle, Nadja Perle, Susanne Hossfeld, Bernd Neumann, Andreas Behring, Meltem Avci-Adali, Tobias Walker, Christian Schlensak, Hans Peter Wendel, Andrea Nolte
Presently, a new era of drug-eluting stents is continuing to improve late adverse effects such as thrombosis after coronary stent implantation in atherosclerotic vessels. The application of gene expression-modulating stents releasing specific small interfering RNAs (siRNAs) or messenger RNAs (mRNAs) to the vascular wall might have the potential to improve the regeneration of the vessel wall and to inhibit adverse effects as a new promising therapeutic strategy. Different poly (lactic-co-glycolic acid) (PLGA) resomers for their ability as an siRNA delivery carrier against intercellular adhesion molecule (ICAM)-1 with a depot effect were tested...
February 10, 2017: Pharmaceuticals
https://www.readbyqxmd.com/read/28203369/is-endovascular-treatment-with-multilayer-flow-modulator-stent-insertion-a-safe-alternative-to-open-surgery-for-high-risk-patients-with-thoracoabdominal-aortic-aneurysm
#2
Carolline Pinto, George Garas, Leanne Harling, Ara Darzi, Roberto Casula, Thanos Athanasiou
A best evidence topic in cardiothoracic and vascular surgery was written according to a structured protocol. The question addressed was whether endovascular treatment with multilayer flow modulator stents (MFMS) can be considered a safe alternative to open surgery for high-risk patients with thoracoabdominal aortic aneurysm (TAAA). Altogether 27 papers were identified using the reported search, of which 11 represented the best evidence to answer the clinical question. The authors, journal, date and country of publication, patient group studied, study type, relevant outcomes, results, and study limitations are tabulated...
March 2017: Annals of Medicine and Surgery
https://www.readbyqxmd.com/read/28197826/safety-and-efficacy-of-a-novel-abluminal-groove-filled-biodegradable-polymer-sirolimus-eluting-stent
#3
Jinzhou Zhu, Huizhu Liu, Haipo Cui, Zhirong Tang, Chengli Song, Ruiyan Zhang
Late stent thrombosis (LST) following drug-eluting stent (DES) implantation in patients with coronary artery disease (CAD) is often associated with delayed vascular healing, resulting from vascular inflammation and hypersensitivity to durable polymers and drugs. Therefore, DES design, materials, and coatings have been technologically revolutionized. Herein, we designed a novel abluminal groove-filled biodegradable polymer sirolimus-eluting stent (AGF-BP-SES), with a sirolimus content of only about one-third of traditional DES...
March 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28197713/early-vascular-responses-after-everolimus-eluting-stent-implantation-assessed-by-serial-observations-of-intracoronary-optical-coherence-tomography
#4
Hideki Yano, Shigeo Horinaka, Mayuko Ishikawa, Toshihiko Ishimitsu
A recent OCT study revealed that the lack of stent strut endothelial coverage is associated with late stent thrombosis after drug-eluting stent implantation. However, the sequential changes of stent strut endothelial coverage in the extremely early period have never been reported. Serial OCTs were performed in 35 patients with 35 EES (everolimus-eluting stent)-treated de novo lesions at 0, 2, 4, and 12 weeks after EES implantation. Serial changes in quantitative parameters of the neointima (neointimal thickness, stent strut coverage, and apposition of each strut) were analyzed...
February 14, 2017: Heart and Vessels
https://www.readbyqxmd.com/read/28197285/percutaneous-intervention-of-a-persistent-left-superior-vena-cava-draining-into-left-pulmonary-vein-and-coarctation-of-the-aorta
#5
Saad Al Bugami, Mohammed Althobaiti, Tarek Momenah, Jamilah Alrahimi, Wael Al Kashkari
We describe a 54-year-old male with history of type II DM, hypertension and dyslipidemia during admission for bronchopneumonia discovered to have coarctation of the aorta and a persistent left superior vena cava (PLSVC) draining into the left atrium through the left superior pulmonary vein. The latter was thought to contribute to a transient ischemic attack and an episode of chest pain resulting in ST-segment elevation in the inferior leads. He was treated with coarctation stenting and percutaneous exclusion of the PLSVC with a vascular plug...
August 2016: Cardiology Research
https://www.readbyqxmd.com/read/28191625/iatrogenic-vascular-injuries-due-to-spinal-surgeries-endovascular-perspective
#6
Mustafa Gok, Elcin Aydin, Serkan Guneyli, Ali Akay, Celal Cinar, Ismail Oran
AIM: Iatrogenic vascular injuries due to spinal surgeries are rare but serious complications. Surgical management of these injuries is challenging with high morbidity rates. In this study we aim to present the results of endovascular management of iatrogenic vascular injuries due to spinal surgeries. MATERIAL AND METHODS: We retrospectively reviewed 11 patients (5 male, 6 female) who had vascular injuries due to cervical and lumbar spinal surgeries. Clinical findings were bleeding (n=5), leg edema (n=6) and right heart failure with severe dyspnea (n=1)...
January 17, 2017: Turkish Neurosurgery
https://www.readbyqxmd.com/read/28190720/endarterectomy-versus-stenting-in-patients-with-prior-ipsilateral-carotid-artery-stenting
#7
Isibor J Arhuidese, Besma Nejim, Susruth Chavali, Satinderjit Locham, Tammam Obeid, Caitlin W Hicks, Mahmoud B Malas
OBJECTIVE: In-stent restenosis is a recognized complication of carotid angioplasty and stenting (CAS), and it is associated with an increased risk of stroke. Few case series have reported outcomes separately following carotid endarterectomy (CEA) and CAS for the treatment of in-stent restenosis. In this study, we perform an evaluation of redo-CAS vs CEA in a large contemporary cohort of patients who underwent prior ipsilateral CAS. METHODS: We studied all patients in the Vascular Quality Initiative (VQI) database, who underwent CEA or CAS between January 1, 2003, and April 30, 2016, after prior ipsilateral CAS...
February 9, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28186233/residual-tracheobronchial-malacia-after-surgery-for-vascular-compression-in-children-treatment-with-stenting
#8
Paola Serio, Raffaella Nenna, Valentina Fainardi, Laura Grisotto, Annibale Biggeri, Roberto Leone, Luigi Arcieri, Marco Di Maurizio, Denise Colosimo, Roberto Baggi, Bruno Murzi, Lorenzo Mirabile, Fabio Midulla
No abstract text is available yet for this article.
February 1, 2017: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/28184401/biodegradable-vascular-stents-with-high-tensile-and-compressive-strength-a-novel-strategy-for-applying-monofilaments-via-solid-state-drawing-and-shaped-annealing-processes
#9
Seung Hyuk Im, Chang Yong Kim, Youngmee Jung, Yangsoo Jang, Soo Hyun Kim
Monofilaments such as those consisting of polyamide (PA), polydioxanone (PDS), and poly(vinylidene fluoride) (PVDF), have been commonly used in various industries. However, most are non-biodegradable, which is unfavorable for many biomedical applications. Although biodegradable polymers offer significant benefits, they are still limited by their weak mechanical properties, which is an obstacle for use as a biomaterial that requires high strength. To overcome the current limitations of biodegradable monofilaments, a novel solid-state drawing (SSD) process was designed to significantly improve the mechanical properties of both PA and poly(l-lactic acid) (PLLA) monofilaments in this study...
February 10, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28183701/association-of-serum-hmgb2-levels-with-in-stent-restenosis-hmgb2-promotes-neointimal-hyperplasia-in-mice-with-femoral-artery-injury-and-proliferation-and-migration-of-vsmcs
#10
Yu Hu He, Xiao Qun Wang, Jian Zhang, Zhu Hui Liu, Wen Qi Pan, Ying Shen, Zheng Bin Zhu, Ling Jie Wang, Xiao Xiang Yan, Ke Yang, Rui Yan Zhang, Wei Feng Shen, Feng Hua Ding, Lin Lu
OBJECTIVE: In a previous study, we established diabetic and nondiabetic minipig models with coronary artery in-stent restenosis (ISR). Mass spectrometry showed that high-mobility group box (HMGB) 2 level was higher in ISR than in non-ISR tissue from diabetic minipigs. We here investigated whether serum HMGB2 levels were related to ISR in CAD patients. The effect of HMGB2 was evaluated in mice with femoral artery wire injury and in human aortic smooth muscle cells. APPROACH AND RESULTS: From 2513 patients undergoing coronary artery intervention and follow-up angiography at ≈1 year, 262 patients were diagnosed with ISR, and 298 patients with no ISR were randomly included as controls...
February 9, 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/28183598/immobilization-of-heparin-poly-l-lysine-microspheres-on-medical-grade-high-nitrogen-nickel-free-austenitic-stainless-steel-surface-to-improve-the-biocompatibility-and-suppress-thrombosis
#11
Menghua Li, Haide Wu, Yi Wang, Tieying Yin, Hans Gregersen, Xiaojuan Zhang, Xiaoling Liao, Guixue Wang
Thrombosis formation, restenosis, and delayed endothelium regeneration continue to be a challenge for coronary artery stent therapy. To improve the hemocompatibility of cardiovascular implants and to selectively direct vascular cell behavior, a novel heparin/poly-l-lysine microsphere was developed and immobilized on a dopamine-coated surface. We chose medical grade high nitrogen nickel-free austenitic stainless steel as the stent material since it has better biocompatibility. The stability and structural characteristics of the microspheres changed with the heparin: poly-l-lysine concentration ratio...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28181708/interventional-eus-where-are-we-headed
#12
REVIEW
Marco J Bruno
EUS is an essential endoscopic tool within the diagnostic and therapeutic armamentarium of gastrointestinal and hepatic diseases. EUS-guided tissue acquisition will develop towards facilitating personalized treatment by obtaining large representative tissue specimens for elaborate immunohistochemical and biomolecular typing of the tumor. Intra-tumoral or intra-vascular delivery of drugs potentially offer many advantages over systemic injection. Intratumoral application of radiofrequency ablation and photodynamic therapy show promise but need to be explored further...
February 9, 2017: Digestive Endoscopy: Official Journal of the Japan Gastroenterological Endoscopy Society
https://www.readbyqxmd.com/read/28180043/preoperative-protective-endovascular-covered-stent-placement-followed-by-surgery-for-management-of-the-cervical-common-and-internal-carotid-arteries-with-tumor-encasement
#13
Michael R Markiewicz, Phillip Pirgousis, Curtis Bryant, James C Cunningham, Roi Dagan, Sukhwinder J Sandhu, Daniel A Siragusa, Arun Gopinath, Rui Fernandes
Objective The objective of this study was to report the outcomes on a preliminary cohort of patients with tumor encasement of either, or both, the cervical internal carotid artery (ICA) and common carotid artery (CCA) following preoperative covered stent placement and surgical resection. Setting This study was set at the University of Florida College of Medicine, Jacksonville, FL. Participants Subjects who received preoperative stenting of the cervical ICA/CCA before surgical resection of head and neck tumors between April 1, 2015, and July 31, 2015 were participated...
February 2017: Journal of Neurological Surgery. Part B, Skull Base
https://www.readbyqxmd.com/read/28169555/aspiration-thrombectomy-and-intracoronary-tirofiban-via-guideliner-%C3%A2-catheter-for-a-thrombosed-aneurysmal-vessel
#14
James Fry, Ali Naqvi, Amit Bahia, Arnold Seto
A 52-year-old Asian male with no traditional risk factors for coronary artery disease presented with acute coronary syndrome. Coronary angiography showed complete thrombotic occlusion of the left circumflex with a large thrombus burden in the setting of diffuse aneurysmal enlargement of the coronary arteries consistent with antecedent Kawasaki disease. Manual thrombectomy with adjunctive intracoronary tirofiban was performed utilizing the GuideLiner catheter. Stent implantation was deferred. Follow-up imaging 48 h later showed preserved coronary flow and decreased thrombus burden...
February 7, 2017: Future Cardiology
https://www.readbyqxmd.com/read/28159651/a-multicentre-survey-of-endovascular-theatre-equipment-and-radiation-exposure-in-france-during-iliac-procedures
#15
Blandine Maurel, Adrien Hertault, Lucie Salomon du Mont, Sébastien Cazaban, Simon Rinckenbach
AIM: To evaluate radiation exposure, endovascular theatre equipment and practices in France during iliac angioplasty. METHODS: A prospective observational study was performed among vascular surgeons who attended a half day of radiation safety training in 2012 and 2015 and had to collect data on 3 patients undergoing iliac procedure. In 2012, 330 surgeons performed 899 procedures, compared to 114 surgeons and 338 procedures in 2015. Due to exclusions, 653 and 306 procedures were analysed in 2012 and 2015, respectively...
January 31, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28157748/large-artery-atherosclerotic-occlusive-disease
#16
John W Cole
PURPOSE OF REVIEW: Extracranial or intracranial large artery atherosclerosis is often identified as a potential etiologic cause for ischemic stroke and transient ischemic attack. Given the high prevalence of large artery atherosclerosis in the general population, determining whether an identified atherosclerotic lesion is truly the cause of a patient's symptomatology can be difficult. In all cases, optimally treating each patient to minimize future stroke risk is paramount. Extracranial or intracranial large artery atherosclerosis can be broadly compartmentalized into four distinct clinical scenarios based upon the individual patient's history, examination, and anatomic imaging findings: asymptomatic and symptomatic extracranial carotid stenosis, intracranial atherosclerosis, and extracranial vertebral artery atherosclerotic disease...
February 2017: Continuum: Lifelong Learning in Neurology
https://www.readbyqxmd.com/read/28155700/multi-objective-optimization-of-coronary-stent-using-kriging-surrogate-model
#17
Hongxia Li, Junfeng Gu, Minjie Wang, Danyang Zhao, Zheng Li, Aike Qiao, Bao Zhu
BACKGROUND: In stent design optimization, the functional relationship between design parameters and design goals is nonlinear, complex, and implicit and the multi-objective design of stents involves a number of potentially conflicting performance criteria. Therefore it is hard and time-consuming to find the optimal design of stent either by experiment or clinic test. Fortunately, computational methods have been developed to the point whereby optimization and simulation tools can be used to systematically design devices in a realistic time-scale...
December 28, 2016: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28155691/influence-of-endoleak-positions-on-the-pressure-shielding-ability-of-stent-graft-after-endovascular-aneurysm-repair-evar-of-abdominal-aortic-aneurysm-aaa
#18
Jie Li, Xiaopeng Tian, Zhenze Wang, Jiang Xiong, Yubo Fan, Xiaoyan Deng, Anqiang Sun, Xiao Liu
BACKGROUND: Abdominal aortic aneurysm (AAA) is a kind of dangerous aortic vascular disease, which is characterized by abdominal aorta partial enlargement. At present, endovascular aneurysm repair (EVAR) is one of the main treatments of abdominal aortic aneurysm. However for some patients after EVAR the aneurysm re-expanded and even ruptured, leading to poor postoperative effect. The stent-graft endoleak after EVAR was realized to influence the AAA in-sac pressure and contribute to the aneurysm re-enlargement...
December 28, 2016: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28155683/towards-the-patient-specific-design-of-flow-diverters-made-from-helix-like-wires-an-optimization-study
#19
Mingzi Zhang, Hitomi Anzai, Bastien Chopard, Makoto Ohta
BACKGROUND: Flow diverter (FD) intervention is an emerging endovascular technique for treating intracranial aneurysms. High flow-diversion efficiency is desired to accelerate thrombotic occlusion inside the aneurysm; however, the risk of post-stenting stenosis in the parent artery is posed when flow-diversion efficiency is pursued by simply decreasing device porosity. For improving the prognosis of FD intervention, we develop an optimization method for the design of patient-specific FD devices that maintain high levels of porosity...
December 28, 2016: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28155264/surgical-and-endovascular-venous-arterialization-ready-to-take-on-the-desert-by-storm
#20
Michiel A Schreve, Çağdaş Ünlü, Steven Kum, Yih K Tan
Patients with critical limb ischemia have a poor life expectancy, and aggressive revascularization is accepted to maintain their independence in the end stage of life. Bypass surgery and, more recently, endovascular interventions with angioplasty and stenting have become the treatment of choice to prevent amputation and resolve rest pain. Up to 20% of patients with critical limb ischemia are not suitable candidates for a vascular intervention because of extensive occlusions of the outflow in the crural and pedal vessels...
February 2, 2017: Journal of Cardiovascular Surgery
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