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经食管超声心动图检测主动脉粥样硬化斑块与冠状动脉病变严重程度的相关性研究

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中华超声影像学杂志 2009年第10期18卷 832-835页

作者：何怡华李治安谷孝艳 j.v.(Ian)nixon 首都医科大学附属北京安贞医院超声诊断科北京100029 Pauley Heart Center Virginia Commonwealth UniversityUSA

目的通过经食管超声心动图检测主动脉的不同部位不同斑块性质与冠状动脉血管病变严重程度进行对比研究，寻找冠状动脉病变严重程度的预测因素。方法对118例同时进行了经食管超声心动图及冠状动脉造影检查的患者进行对比研究。冠状动脉... 详细信息

目的通过经食管超声心动图检测主动脉的不同部位不同斑块性质与冠状动脉血管病变严重程度进行对比研究，寻找冠状动脉病变严重程度的预测因素。方法对118例同时进行了经食管超声心动图及冠状动脉造影检查的患者进行对比研究。冠状动脉造影显示血管内径狭窄≥70％定义为冠状动脉病变。粥样硬化斑块厚度大于4mm，有漂浮物形成或斑块溃疡定义为复杂斑块；其他大于2mm并小于4mm的斑块定义为简单斑块。根据冠状动脉病变支数将研究对象分为4组：A组（0支病变）99例，B组（1支病变）31例，C组（2支病变）8例，D组（3支病变）30例，比较各组间粥样硬化斑块的发生部位及程度特征。结果与A组0支病变的99例相比，有血管狭窄的89例患者（包括B，C，D组）的主动脉内粥样斑块的发生率、严重度均明显增高（P〈0．05）。多元回归分析显示高血压（优势比3．0，95％可信区间1．3～7．0，P=0．013）、糖尿病（优势比2．4，95％可信区间1．1～4．9，P=0．022）及主动脉斑块（优势比3．8，95％可信区间1．8～8．2，P=0．001）与冠状动脉病变发生明显相关。简单及复杂斑块均与冠状动脉病变严重度明显相关（P〈0．001）。多元回归分析显示主动脉降部复杂斑块是冠状动脉病变的最强预测因子（优势比5．4，95％可信区间1．8～16．4，P=0．003）。结论主动脉内简单及复杂粥样斑块均与冠状动脉病变严重度明显相关。降主动脉复杂斑块是冠状动脉病变的最强预测因子。

关键词：超声心动描记术经食管主动脉动脉粥样硬化冠状动脉疾病

Coronary pseudoaneurysm following thoracic motocross trauma

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Coronary pseudoaneurysm following thoracic motocross trauma

中国超声医学工程学会成立30周年暨第十二届全国超声医学学术大会

作者： Lin Liu Yi-hua He Zhi-an Li Lian-zhong Zhang Ya-nan Li Cun-ying Cui Yuan-yuan Liu j.v.(Ian) nixon Department of Ultrasound in Medicine Henan Provincial Hospital Department of Ultrasound in Medicine Beijing Anzhen HospitalCapital Medical University Noninvasive Cardiology ServicePauley Heart CenterVirginia Commonwealth University School of Medicine

A 42-year-old man was referred to the hospital because of persistent atypical chest *** gave a history of thoracic trauma in a motocross accident six months *** echocardiography(TTE) at the time of his presentation showed dilatation of the origin of the right coronary artery(RCA) consistent with a pseudoaneurysm,with areas of increased echodensity consistent with *** artery computed tomography(CTA) showed a partially thrombosed pseudoaneurysm adjacent to the right atrioventricular *** surgery showed a giant RCA pseudoaneurysm containing *** pseudoaneurysm was excised and the RCA underwent coronary artery bypass *** echocardiography is capable of locating a coronary pseudoaneurysm of the RCA,in addition to estimating its size and detecting the presence of thrombus within the pseudoaneurysm.

关键词：

经食管超声心动图检测主动脉内粥样硬化斑块与冠状动脉病变严重程度的对比研究

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经食管超声心动图检测主动脉内粥样硬化斑块与冠状动脉病变严重程...

中华医学会第十次全国超声医学学术会议

作者：何怡华李治安谷孝艳 j.v.(Ian)nixon 首都医科大学附属北京安贞医院超声诊断科

目的:通过经食管超声心动图检测的主动脉的不同部位不同斑块性质与冠状动脉血管病变严重程度进行对比研究,寻找冠状动脉病变的预测因素。方法:对118例同时进行了食管超声心动图及冠状动脉血管造影的患者进行对比研究。冠状动脉造影显示...

目的:通过经食管超声心动图检测的主动脉的不同部位不同斑块性质与冠状动脉血管病变严重程度进行对比研究,寻找冠状动脉病变的预测因素。方法:对118例同时进行了食管超声心动图及冠状动脉血管造影的患者进行对比研究。冠状动脉造影显示血管内径狭窄≥70%定义为冠状动脉病变。粥样硬化

关键词：

经食管超声心动图对不明原因缺血性脑卒中患者心源性栓子的检出

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经食管超声心动图对不明原因缺血性脑卒中患者心源性栓子的检出

中国超声医学工程学会成立30周年暨第十二届全国超声医学学术大会

作者：谷孝艳何怡华李治安 j.v.(Ian)nixon 首都医科大学附属北京安贞医院

目的应用经食管超声(Transesophageal echocardiography,TEE)探查不明原因缺血性脑卒中(Cryptogenic stroke,CS)患者的心源性栓子来源可能,寻找特发性脑卒中的心源性因素。方法对2006年8月至2008年7月病因不明的缺血性脑卒中为排除心源...

目的应用经食管超声(Transesophageal echocardiography,TEE)探查不明原因缺血性脑卒中(Cryptogenic stroke,CS)患者的心源性栓子来源可能,寻找特发性脑卒中的心源性因素。方法对2006年8月至2008年7月病因不明的缺血性脑卒中为排除心源性栓子进行TEE检查的患者作为研究对象进行了回顾性分析。所有脑卒中患者均行头部CT或MRI,颈动脉多普勒检查及实验室化验。研究对象包括经TEE检查的263例CS患者,男例,女例,年龄岁(平均),所有TEE均在所有TEE检查均应用Sonos-5500食道探头(飞利浦,USA)。经静脉注射生理盐水9ml与气体1ml混合的声学造影剂于双房上下腔切面(约90-120度)、不标准大动脉短轴切面及四腔心切面来观测是否存在PFO。并于升主动脉长轴切面,主动脉横弓部切面观察是否存在复杂性粥样硬化斑块。结果 263例患者中,存在心源性因素的患者131例(49.8%),存在卵圆孔未闭59例,发生率为22.4%;复杂斑块的发生率为40例,发生率为15.2%;房颤患者18例,二尖瓣上赘生物5例,主动脉瓣上赘生物2例,主动脉夹层1例,左心耳血栓3例,左房粘液瘤1例,左心室血栓2例。结论在导致CS的心源性可能致病因素中卵圆孔未闭及主动脉斑块的发生率最高,而TEE检查是CS病因诊断的可行手段,不明原因的脑梗死患者,建议进一步采用TEE检查。这样可使近1/3的患者发现可能的心源性栓子来源。

关键词：

对不明原因缺血性脑卒中患者卵圆孔未闭和主动脉粥样硬化斑块的对比研究

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对不明原因缺血性脑卒中患者卵圆孔未闭和主动脉粥样硬化斑块的对...

中华医学会第十次全国超声医学学术会议

作者：谷孝艳李治安何怡华 j.v.(Ian) nixon 首都医科大学附属北京安贞医院超声诊断科

目的:应用经食管超声(TEE)探查卵圆孔未闭(Patent foramen ovale,PFO)及升主动脉、主动脉弓部内粥样硬化斑块探讨与不同年龄组特发性脑卒中(Cryptogenic stroke,CS)患者的关系,寻找特发性脑卒中的原因。方法:研究对象包括经TEE检查的229...

目的:应用经食管超声(TEE)探查卵圆孔未闭(Patent foramen ovale,PFO)及升主动脉、主动脉弓部内粥样硬化斑块探讨与不同年龄组特发性脑卒中(Cryptogenic stroke,CS)患者的关系,寻找特发性脑卒中的原因。方法:研究对象包括经TEE检查的229例CS患者为患病组;314例无脑卒中病史为

关键词：

Thermoluminescence characterization of natural and synthetic irradiated Ce-monazites

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journal of Rare Earths 2024年第4期42卷 643-650页

作者： v.Correcher C.Boronat j.Garcia-Guinea j.F.Benavente T.Rivera-Montalvo CIEMAT Av.Complutense 4028040MadridSpain MNCN-CSIC J.Gutierrez Abascal 228006MadridSpain Instituto Politécnico Nacional CICATA-IPNAv.Legaria 694Mexico City11500Mexico

The thermoluminescence(TL)emission of synthetic and natural Ce-monazites was characterized here to determine the potential application in the identification of microscopic defects from a qualitative point of view trying to link each TL peak to a chemical-physical *** kinetic parameters that lead the luminescence processes were calculated by means of variable heating rate and computing glow curve deconvolution methods and allow identifying three groups of components at~90,130 and 290℃(for the mineral sample)and~90,170,220,270 and 320℃(for the synthetic CePO_(4):Nd_(0.20),La_(0.25)).The main differences appreciated in these complex TL curves are mainly due to(i)the content of impurities(natural sample contains lanthanides as well as U 0.60%and Th 5.22%)and(ii)the degree of crystallinity of the samples which is directly related to the type of impurities(synthetic monazite relies only on Nd and La).The behavior of the dose response in the range of 1-8 Gy is similar for both samples;the TL intensity increases linearly as the dose increases without changes in the position of the maxima,denoting first-order kinetic luminescence *** peak could be mostly associated with structural defects(i.e.,phase transitions),chemical reactions(i.e.,Ce3+?Ce4+redox reaction,dehydration or dehydroxylation processes)or intrinsic defects(i.e.,Frenkel defects,ODCs or NBOHCs).

关键词： Thermoluminescence Kineticparameters Phosphate Ce-monazite Defects Rare earths

卒中一级预防指南美国心脏协会／美国卒中协会为医疗卫生专业人员制定的指南美国神经病学学会肯定本指南作为神经科医生继续教育工具的价值

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国际脑血管病杂志 2010年第12期18卷 881-943页

作者： Larry B. Goldstein Cheryl D. Bushnell Robert j. Adams Lawrence j. Appel Lynne T. Braun Seemant Chaturvedi Mark A. Creager Antonio Culebras Robert H. Eckel Robert G. Hart judith A. Hinchey virginia j. Howard Edward C. jauch Steven R. Levine james F. Meschia Wesley S. Moore j.v. (Ian) nixon Thomas A. Pearson 张霞(译) 尤寿江(译) 陈孝东(译) 卢涛声(译) 石际俊(译) 曹勇军(译) 徐兴顺(译) 代表美国心脏协会卒中委员会、心血管护理委员会、流行病学和预防委员会、高血压研究委员会、周围血管病委员会以及医疗质量和转归研究跨学科委员会苏州大学附属第二医院神经内科苏州大学神经科学研究所215004

背景和目的本指南对各种已确定和新出现的卒中危险因素的证据进行概述，以提供降低首次卒中风险的循证推荐。方法写作组成员由委员会主席根据每位成员先前在相关课题领域中的工作提名，并经美国心脏协会（American HeartAssociation，AH... 详细信息

背景和目的本指南对各种已确定和新出现的卒中危险因素的证据进行概述，以提供降低首次卒中风险的循证推荐。方法写作组成员由委员会主席根据每位成员先前在相关课题领域中的工作提名，并经美国心脏协会（American HeartAssociation，AHA）卒中委员会科学声明监督委员会批准。写作组采用系统文献回顾的方法（涵盖时间为2006年上一次回顾发表到2009年4月），参考先前已发表的指南、个人文件和专家意见来总结现有证据，并指出现有知识的差距；如果合适，则根据标准的AHA标准做出推荐。写作组全体成员均有机会对推荐进行评论并审核这份声明的最终文本。在AHA科学咨询和协调委员会考察和批准之前，本指南已南卒中委员会领导层和AIIA科学声明督察委员会进行过广泛的同行评议。结果对评价个体首次卒巾风险的流程图进行了评价。根据干预的町能性（不可于预、可于预或潜在可干预）和证据的强度（证据充分或证据不太充分），对首次卒中的危险因素或风险标记物进行分类。不可干预危险因素包括年龄、性别、低出生体质量、人种／种族和遗传倾向。证据充分的叮干预危险因素包括高血压、吸烟、糖尿病、心房颤动和某些其他心脏病、血脂异常、颈动脉狭窄、镰状细胞病、绝经后激素治疗、不良饮食习惯、体力活动过少以及肥胖和体脂分布。证据不太充分或潜在的可干预危险因素包括代谢综合征、酗酒、药物滥用、口服避孕药、睡眠呼吸障碍、偏头痛、高同型半胱氨酸血症、脂蛋白（a）升高、高凝状态、炎症和感染。对用阿司匹林进行卒中一级预防的资料进行了回顾。结论多方面的证据可用于确定能增高首次卒中风险的多种具体因素并提供降低这种风险的策略。

关键词： AHA科学声明卒中危险因素一级预防

Stand dynamics of old-growth hemlock forests in central Bhutan are shaped by natural disturbances

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Forest Ecosystems 2024年第4期11卷 434-447页

作者： Karma Tenzin Craig R.Nitschke Kathryn j.Allen Raphael Trouve Thiet v.Nguyen Patrick j.Baker School of Agriculture Foodand Ecosystem SciencesUniversity of Melbourne500 Yarra BlvdRichmondVictoriaAustralia School of Geography Planningand Spatial SciencesUniversity of TasmaniaSandy BayTasmaniaAustralia Forest Science Institute of South vietnam 1 Pham Van Hai StreetTan Binh DistrictHo Chi Minh CityViet Nam

Understanding how past disturbances have influenced the development of forests is critical for deciphering their current structure and composition and forecasting future *** this study,dendrochronological methods were applied to uncover the disturbance history of old-growth hemlock-dominated forests in central *** of tree-ring samples from two old-growth hemlock stands,located in two different topographic settings,identified the importance of gap-phase dynamics in facilitating recruitment and growth releases and producing complex,multi-aged structure s over *** site showed evidence of a near stand-replacing disturbance in the late 1700s,while the other showed no evide nce of high-severity disturbance at any time over the last 400 *** both sites low-to medium-severity disturbances,some of which appear to be associated with cyclones originating in the Bay of Bengal,dominated the disturbance *** hemlock stands exhibited a significant positive association between cyclone occurrence and growth release events and between recruitment pulses and growth release *** 1800 to 1970 there was an increase in recruitment of angiosperm tree species at most sites and a corresponding decline in conifer *** the past 50 years there has been little new recruitment;this may be due to light limitation in the understory from shade-tolerant angiosperms and bamboo in the lower strata of these *** variations in disturbance dynamics and recruitment were observed across the study sites,suggesting that other factors,such as topography and climate,may be influencing long-term stand development *** study highlights the complex interplay between historical disturbance regimes and tree recruitment in shaping the age and size structures of old-growth hemlock forests in central *** also provides new insights into the dynamics of these forests that can be used to support effective forest conservation and management i

关键词： Forest structure Hemlock forest Himalaya Natural disturbance

In situ digital testing method for quality assessment of soft soil improvement with polyurethane

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journal of Rock Mechanics and Geotechnical Engineering 2024年第5期16卷 1732-1748页

作者： X.F.Wang C.j.Wang W.v.Yue Z.j.Zhang Z.Q.Yue Department of Civil Engineering China University of Geosciences (Beijing)BeijingChina Department of Water Science and Engineering Zhengzhou UniversityZhengzhouChina Department of Geotechnical Engineering Tongji UniversityShanghaiChina Department of Civil Engineering The University of Hong KongChina

This study purposes an in situ testing method on quality assessment of soil *** drilling data includes the spatial distribution and in situ strength of untreated and treated soil along three different drillholes measured by on-site drilling monitoring *** factual drilling data can characterize the degree of soil improvement by penetration injection with permeable *** from on-site drilling monitoring shows that the linear zones represent constant drilling speeds shown in the plot of drill bit advancement *** drilling time,which indicates the spatial distributions of soil *** soil profile at the study site is composed of four layers,which includes fill,untreated silty clay,treated silty clay,and mucky *** results of soil profile are verified by the parallel site *** constant drilling speeds profile the coring-resistant strength of drilled *** comparing with the untreated silty clay,the constant drilling speeds of the treated silty clay have been decreased by 13.0-62.8%.Two drilling-speed-based indices of 61.2%and 65.6%are proposed to assess the decreased average drilling speed and the increased in situ strength of treated silty *** tests,*** compressive strength(UCS)test,have been performed with core sample to investigate and characterize in situ strength by comparing that with drilling *** show that the average predicted strengths of treated silty clay are 2.4-6.9 times higher than the average measured strength of untreated silty *** UCS-based indices of 374.5%and 344.2%verified the quality assessment(QA)results by this new in situ *** method provides a cost-effective tool for quality assessment of soil improvement by utilizing the digital drilling data.

关键词： Drilling process monitoring system Hydraulic rotary drilling process Constant drilling speed Soil improvement Quality assessment