检索结果-南通市图书馆

中华医学杂志(英文版) 2024年第14期137卷 1750-1752页

作者： Xie Xinsheng zhang Wei Fu Weiguo zhang wayne W. Wang Lixin Department of Vascular Surgery Xiamen Branch Zhongshan Hospital Fudan University Xiamen Fujian China Department of Vascular Surgery Zhongshan Hospital Fudan University Shanghai China Department of Plastic surgery Plastic Surgery Hospital Peking Union Medical College Beijing China Department of Division of Vascular and Endovascular Surgery Seattle VA Medical Center University of Washington Seattle WA USA

To the Editor: Thoracic endovascular aortic repair (TEVAR) has been widely accepted as the first-line treatment when aortic repair is indicated. However, TEVAR is still limited by anatomic conditions in many circumstances, and the most common exclusion situations are inadequate proximal and/or distal landing zones when important branch vessels are involved. The incidence of insufficient distal landing zone in descending TEVAR ranges from 2.5% to 15.2%, and different approaches to extend it were described. Hybrid surgery with combined TEVAR and open revascularization of visceral vessels has been employed from the early stage of endovascular aortic repair but it is associated with poor outcomes. Endovascular visceral artery revascularization, such as branched and fenestrated endograft, has been used more recently. Outcomes of stenting visceral arteries during fenestrated/branched aortic repair were explored by several studies and promising results were exhibited. However, these techniques demand heavily on available device and technical skills. Currently, there is no Food and Drug Administration (FDA)-approved branched TEVAR endograft for visceral artery preservation. Chimney or snorkel procedures are relatively easier to perform, but it is associated with a higher incidence of endoleaks.

关键词： ANEURYSM TRUNK TEVAR

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

动静脉移植物内瘘并发症的干预原则

中华医学杂志 2024年第32期104卷 2980-2983页

作者：王宇飞张玮郑州大学第一附属医院血液净化中心郑州华盛顿大学医学院血管外科美国西雅图

动静脉移植物内瘘(AVG)的主要并发症包括狭窄、血栓形成及感染等。狭窄常采用腔内技术处理, 特殊部位可采用旁路、间置、补片等外科修复技术。血栓处理常包括血栓减容与纠正狭窄两部分, 前者包括导管接触性溶栓、腔内介入技术、外科修... 详细信息

动静脉移植物内瘘(AVG)的主要并发症包括狭窄、血栓形成及感染等。狭窄常采用腔内技术处理, 特殊部位可采用旁路、间置、补片等外科修复技术。血栓处理常包括血栓减容与纠正狭窄两部分, 前者包括导管接触性溶栓、腔内介入技术、外科修复技术或杂交技术。经验性抗生素应用前留取病原学检测是感染处理的第一步, 针对不同感染范围可分别采取移植物部分切除并置换、移植物全切、移植物部分切除手段。积极预防、及时发现和正确干预并发症可以改善AVG结局。AVG并发症的干预方案应在系统评估的基础上个体化制订。

关键词：血液透析动静脉移植物内瘘并发症干预

The PSG challenge: towards comprehensive scene understanding

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

National Science Review 2023年第6期10卷 41-44页

作者： Jingkang Yang Zheng Ma Qixun Wang Xiaofeng Guo Haofan Wang Ziwei Liu wayne zhang Xing Xu Hai zhang Sense Time Research S-Lab Nanyang Technological University Xiaohongshu Inc Institute of Optics and Electronics Chinese Academy of Sciences School of Computer Science and Engineering University of Electronic Science and Technology of China Pazhou Laboratory (Huangpu) School of Mathematics Northwest University

INTRODUCTION Most computer vision tasks currently focus on recognizing objects in *** instance,image classification only needs to identify the main object in an image [1],while object detection and image segmentation only require models to locate objects in images [2].However,these tasks are insufficient to achieve a comprehensive and in-depth understanding of a *** example,in ***(i),a model that only detects people,elephants,fences and trees would not have an understanding of the scene, making it unable to provide safety reminders such asnot to feed the *** many realworld AI applications like smart cities,autonomous driving and smart manufacturing,it is crucial to not only localize targets in the scene but also reason and predict their *** example,in autonomous driving,it is important to analyze whether pedestrians on the side of the road are pushing or riding *** smart factories,it is necessary to judge whether operators are working *** these relations is vital for decision-making.

关键词：

Grading system modification and management of blunt aortic injury

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Medical Journal 2013年第3期126卷 442-445页

作者： Kaavya N Reddy Tim Matatov Linda D Doucet Maureen Heldmann Cynthia X Zhao wayne W zhang Division of Vascular and Endovascular Surgery Louisiana State-University' Health Sciences Cemer Shreveport LA USA Department of Radiology Louisiana State University Health Sciences Center Shreveport LA USA Department of Pathology Louisiana State University Health Sciences Center Shreveport LA USA

Background The traditional approach to blunt aortic injury （BAI） has been emergent intervention. This study aimed to utilize a modified imaging grading system that may allow us to categorize these injuries as needing emergent, urgent, or non-operative management. Methods From January 2003 to December 2011, 28 patients with BAI were managed at our institution. Imaging and medical records were reviewed retrospectively. BAI was classified into 4 grades based on imaging studies. Grade la： intimal tear, Grade Ib： intramural hematoma; Grade Ⅱ： intimal injury with periaotic hematoma; Grade Ilia： aortic transection with pseudoaneurysm, Grade Illb： multiple aortic injuries; and Grade IV： free rupture. Progression and clinical outcomes of ABI were analyzed. Results Of the 28 patients, 22 were males and 6 were females with mean age of 38 （range, 7-69） years, Twenty-five （89.3%） had descending thoracic aortic injury, two （7.1%） had abdominal aortic injury and one （3.6%） presented with multiple aortic injuries. Three patients （10.7%） with Grade I, 1 （3.6%） Grade Ⅱ, 22 （78.6%） Grade Ⅲ, and 2 （7.1%） Grade IV injuries. Twenty-five patients underwent thoracic endovascular aortic repair and 3 were managed medically. Median time between injury and surgical intervention was （2±1） days. One （3.6%） patient developed paraplegia after thoracic endovascular aortic repair （TEVAR）. One Type 2 endoleak spontaneously sealed within 1 month, and another patient died from ruptured Type 1 endoleak 3 years later. Median follow-up time was 16 （range, 1-96） months. Perioperative 30-day mortality rate was 3.6%. Conclusions This study based on our modified BAI grading system indicated that Grade Ⅰ BAI can be managed conservatively. Grade Ⅱ injury requires close observation and repeated computerized tomography angiogram （CTA） within 48-72 hours. If injury appears worse on follow up imaging, surgery should be performed. Delayed repair of Grade Ⅲ BAI is acceptable if associated life threatenina traumatic i

关键词： blunt aortic injury imaging grading system endovascular management

维普期刊数据库

The gene expression of adenosine receptors in the processes of contrast induced nephropathy in mouse kidney

在线全文

学校读者我要写书评

暂无评论

World Journal of Cardiovascular Diseases 2013年第9期3卷 561-568页

作者： Luyu Yao Cynthia Zhao Xin Gu Gopi K. Kolluru Christopher G. Kevil wayne W. zhang Department of Pathology Louisiana State University Health Sciences Center Shreveport USA Department of Surgery Louisiana State University Health Sciences Center Shreveport USA

Objective: Contrast induced nephropathy (CIN) is the third leading cause of hospital acquired renal failure. The mechanism of CIN is not fully understood. The objectives of this study were to investigate the expression changes of the four subtypes of adenosine receptors (A1AR, A2AAR, A2BAR, and A3AR) following administration of contrast media in mice. Methods: C57BL/6J mice were randomized into treatment and control groups. Iodixanol (IDX) was administered to two treatment groups through retroorbital injection at two different dosages, 0.75 gI/kg and 2.75 gI/kg. Phosphate buffered saline (PBS) was given to the control group. Mice kidneys were harvested at day 3 and day 7 after Iodixanol administration. Kidney injuries and function were evaluated according to Hematoxylin and eosin stain, Ki67 protein expression, and TUNEL assay of paraffin embedded kidney sections, and plasma creatinine assay. RNA and protein were extracted from the kidney specimens. A1AR, A2AAR, A2BAR, and A3AR RNA and protein level of the samples were assessed using qRT-PCR and Western blotting, with GAPDH as an endogenous control. Results: H&E staining showed no significant histopathology injuries after Iodixanol administration. No evidence of kidney injury and functional impairment was found. However, there was an increased number of A1AR, A2AAR, A2BAR, and A3AR RNA transcripts detected in the kidney 3 days after Iodixanol injection. The RNA levels in all the four subtypes of adenosine receptors were increased 2-3 fold in the day 3 specimens and back to normal at day 7. Western blot demonstrated that A1AR, A2AAR, and A3AR expression increased 1.5 to 2 fold at day 3 and day 7 following Iodixanol injection. A2BAR baseline expression was low in normal physiological conditions and no significant change was detected by Western blot. Conclusions: Iodixanol significantly increases adenosine receptors gene expression in mice. This suggests that adenosine receptors may play a role in the development of CI

关键词： Contrast Induced Nephropathy Adenosine Receptor Iodixanol

Impact of Insurance Status on the Prognosis of Acute Lower Limb Ischemia

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Cardiovascular Diseases 2016年第7期6卷 218-223页

作者： Shyamal Premaratne J. David Neel Cynthia X. Zhao Linda D. Doucet Tze-Woei Tan wayne W. zhang Hunter Holmes McGuire Veterans Administration Medical Center Richmond Virginia USA Department of Surgery Louisiana State University Health Sciences Center Shreveport Louisiana USA Department of Pathology Louisiana State University Health Sciences Center Shreveport Louisiana USA

The objective of this study was to investigate if the insurance status of patients impacted the treatment options and prognosis in acute limb ischemia (ALI). A retrospective chart review was performed at a single university tertiary care center using ICD-9 codes for the diagnosis and procedure for ALI from January 2000 to January 2011. A total of 96 patients were diagnosed with ALI, comprising of 66 males and 30 females with a mean age of 56 years (range was 19 - 80 years). Time to presentation and prognosis (rate and level of amputation) were analyzed using insurance status as the independent variable. Patients covered under commercial insurance were compared to patients with Medicare and Medicaid and to patients without any insurance coverage. Statistical analysis was performed using the proportion z test to evaluate differences among the groups investigated. A “p” value of ≤0.05 was considered significant. In this study, ALI occurred more commonly in African Americans (p = 0.0029) and in patients without insurance coverage regardless of race (p = 0.0034). Chronic obstructive pulmonary disease (COPD), hypertension (HTN), and acute renal failure (ARF) were significantly higher in the uninsured group, compared to the insured group (p = 0.0005, 0.0055, and 0.0034, respectively). The time to hospital admission was significantly longer in uninsured patients compared to the insured group (p = 0.0449). The rates of major amputation above the ankle were 46% in patients with commercial insurance, 62% in the government insurance (Medicare and Medicaid) group, and 51% in the uninsured group. There was no significant difference in major versus minor amputation in patients with commercial insurances. However, the rates of major amputation were significantly higher than the rates of minor amputation in both Medicare and Medicaid and uninsured patients (p = 0.005, and <0.0001, respectively). With respect to acute lower limb ischemia, African Americans presented more frequently a

关键词： Ischemia Lower Extremity Amputation Insurance

VARIABLE STEP-SIZE BDF3 METHOD FOR ALLEN-CAHN EQUATION

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2024年第5期42卷 1380-1406页

作者： Minghua Chen Fan Yu Qingdong zhang Zhimin zhang School of Mathematics and Statistics Gansu Key Laboratory of Applied Mathematics and Complex SystemsLanzhou UniversityLanzhou 730000China Department of Mathematics Wayne State UniversityDetroitMI 48202USA

In this work,we analyze the three-step backward differentiation formula(BDF3)method for solving the Allen-Cahn equation on variable *** BDF2 method,the discrete orthogonal convolution(DOC)kernels are positive,the stability and convergence analysis are well established in[Liao and zhang,***.,90(2021),1207–1226]and[Chen,Yu,and zhang,arXiv:2108.02910,2021].However,the numerical analysis for BDF3 method with variable steps seems to be highly nontrivial due to the additional degrees of freedom and the non-positivity of DOC *** developing a novel spectral norm inequality,the unconditional stability and convergence are rigorously proved under the updated step ratio restriction rk:=τk/τk−1≤1.405 for BDF3 ***,numerical experiments are performed to illustrate the theoretical *** the best of our knowledge,this is the first theoretical analysis of variable steps BDF3 method for the Allen-Cahn equation.

关键词： Variable step-size BDF3 method Allen-Cahn equation Spectral norm inequality Stability and convergence analysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

急慢性肠系膜缺血的诊治

中华血管外科杂志 2021年第3期6卷 147-151页

作者：张玮陈熹阳美国华盛顿大学医学院血管外科西雅图98108 四川大学华西医院血管外科成都610044

肠系膜缺血性疾病具有发病率低,诊治难度大,并发症发生率和死亡率高的特点。因此,对于血管外科或普通外科医生来说都具有很大的挑战性。欧洲血管外科协会(ESVS)和美国血管外科协会(SVS)分别于2017年和2020年发布了关于肠系膜缺血疾病和... 详细信息

肠系膜缺血性疾病具有发病率低,诊治难度大,并发症发生率和死亡率高的特点。因此,对于血管外科或普通外科医生来说都具有很大的挑战性。欧洲血管外科协会(ESVS)和美国血管外科协会(SVS)分别于2017年和2020年发布了关于肠系膜缺血疾病和慢性肠系膜缺血疾病的指南。本文将两个协会指南及最新研究数据结合笔者临床经验,对急慢性肠系膜缺血疾病的诊治作一综合论述。

关键词：肠系膜缺血腔内治疗开放手术诊断

维普期刊数据库

在线全文

学校读者我要写书评

暂无评论

图终身学习:综述

计算机研究与发展 2024年第8期61卷 2067-2096页

作者：刘壮董子宸董宜琳尚家名张帆陈雨然楼佩妍孙欣然王昱赵军 wayne Lin 东北财经大学金融科技学院辽宁大连116025 大连理工大学计算机学院辽宁大连116024 南加州大学计算机学院美国加利福尼亚州洛杉矶90007

图终身学习(lifelong graph learning,LGL)是一个新兴领域,旨在实现对图结构数据的持续学习,以解决现有任务上的灾难性遗忘问题,并使得顺序更新的模型能够适应新出现的图任务.尽管LGL展现出良好的学习能力,但如何持续提高其性能仍然是... 详细信息

图终身学习(lifelong graph learning,LGL)是一个新兴领域,旨在实现对图结构数据的持续学习,以解决现有任务上的灾难性遗忘问题,并使得顺序更新的模型能够适应新出现的图任务.尽管LGL展现出良好的学习能力,但如何持续提高其性能仍然是一个至关重要的问题.为填补现有研究对这一方面的空白,对最近在LGL领域的研究进行了全面调查和总结.首先,重新分类了LGL的现有方法,重点关注克服灾难性遗忘的方法.随后,系统地分析了这些方法的优缺点,并探讨了实现持续性能提升的潜在解决方案.该研究着重于如何在持续学习的过程中避免对旧任务的遗忘,同时快速适应新任务的挑战.最后,还就LGL的未来发展方向进行了讨论,涵盖了其在应用领域、开放性问题等方面的潜在影响,并具体分析了这些方向对持续性能改进的潜在影响.这些讨论将有助于指导未来LGL研究的方向,推动这一领域的进一步发展与应用.

关键词：图终身学习(LGL) 图神经网络(GNN) 重放正则化持续学习增量学习灾难性遗忘

维普期刊数据库

EFFICIENT SPECTRAL METHODS FOR EIGENVALUE PROBLEMS OF THE INTEGRAL FRACTIONAL LAPLACIAN ONABALLOFANYDIMENSION

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2024年第4期42卷 1032-1062页

作者： Suna Ma Huiyuan Li Zhimin zhang Hu Chen Lizhen Chen College of Science Nanjing University of Posts and TelecommunicationsNanjingChina State Key Laboratory of Computer Science/Laboratory of Parallel Computing Institute of SoftwareChinese Academy of SciencesBeijingChina Department of Mathematics Wayne State UniversityDetroitUSA School of Mathematical Sciences Ocean University of ChinaQingdaoChina Beijing Computational Science Research Center BeijingChina

An efficient spectral-Galerkin method for eigenvalue problems of the integral fractional Laplacian on a unit ball of any dimension is proposed in this *** symmetric positive definite linear system is retained explicitly which plays an important role in the numerical *** a sharp estimate on the algebraic system's condition number is established which behaves as N4s with respect to the polynomial degree N,where 2s is the fractional derivative *** regularity estimate of solutions to source problems of the fractional Laplacian in arbitrary dimensions is firstly investigated in weighted Sobolev *** the regularity of eigenfunctions of the fractional Laplacian eigenvalue problem is readily ***,rigorous error estimates of the eigenvalues and eigenvectors are *** experiments are presented to demonstrate the accuracy and efficiency and to validate the theoretical results.

关键词： Integral fractional Laplacian Spectral method Eigenvalue problem Regularity analysis Error estimate