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目的：评价高原地区继发孔型房间隔缺损（ASD）合并肺动脉高压手术治疗的早期疗效。方法：回顾性分析2001年6月至2001年11月在海拔3700m手术治疗的ASD合并肺动脉高压患者21例。其中藏族12例，移居西藏地区的汉族9例；合并室间隔缺损（VSD）6例、中度以上三尖瓣功能性关闭不全7例。术前动脉血氧分压50．1－61．4mmHg、碱剩余－4．3－11．0。均在浅低温、中度血液稀释、心脏不停跳CPB下施行手术。ASD采取直接缝合，同期行VSD修补6例，改良De Vega三尖瓣成形术7例。结果：无手术死亡；均于术后8h内拔除气管插管；术后未出现心、肺和神经等系统严重的并发症；出院时经超声心动图检查未发现残余漏；术后7－10d均痊愈出院。结论：高原地区采用心脏不停跳技术，施行先天性房间隔缺损心内直视修补手术，避免或明显减轻缺血再灌注损伤，可取得确切、满意的早期疗效。 相似文献
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霍云 《内蒙古科技与经济》1997,(1)
笔者于1992年至1997年在北医三院及呼和浩特铁路局中心医院工作期间，对扩张型心肌病心力衰竭（DCM—CHF）患者加用a受体阻滞剂进行治疗，效果满意，现整理并报告如下：1临床资料病例选择：15例患者均经心电图、超声心动图、X线脑片，临床检查以WH012SF1980年诊断标准确诊为DCM，其中男12例，女3例（1名围产期心肌病9年龄24～76岁，病程3个月～8年，其中N”心衰11例，余为Ⅱ°心衰。治疗方法：经卧床、吸氧、低盐、强心利尿等一般治疗后症状改善不理想，仍有心悸、气短、心率增快，肺部湿罗音等症状、体征者，一周左右加用心得安sing… 相似文献
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为探讨风湿性心脏病二尖瓣狭窄左房血栓形成临床相关因素，对69例风心二狭患者行经胸及食管超声心动图检查，并用发色底物显色法测定血浆组织型纤溶酶原激活物活性（tPA)，组织型纤溶酶原激活物抑制物1(PAI-1)活性，抗凝血酶Ⅲ（AT-Ⅲ）活性。结果显示风心二狭左房血栓形成者与无血栓形成者比较年龄偏大，症状持续时间较长，心房纤颤发生率高。超声心动图可见血栓形成者左房内径较大，左室射血分数低下，二尖瓣口面积较小，明显二尖瓣关半闭不全情况少见，且左房血栓形成者均有左房自发性回声（SEC），发生率明显高于无左房血栓形成者。血凝学检查左房形成血栓者红细胞压积（Hct）较高，AT－Ⅲ活性低于无左房血栓形成者（P＜0．01），而纤溶活力左房血栓形成者反而高于无左房血栓形成者，表现为tPA活性较高，PAI－1活性相对较低（P＜0．05）。多元回归分析表明左房SEAC、AT－Ⅲ活性、年龄、二尖瓣口面积是左房血栓形成的独立相关因素。说明风心二狭患者左房血栓的形成不仅与血流的机械性梗阻，而且与机体抗栓能力的下降有关。 相似文献
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《科技风》2016,(21)
目的:评价放射性核素显像与超声心动图联合运用对心肌缺血早期诊断中的临床价值。方式:对经多层螺旋CT扫描血管造影(CTA)明确诊断冠状动脉狭窄的36例患者,行超声心动图与放射性核素显像联合运用来判断静息心肌灌注和运动负荷灌注检查。结果:动态心电图显示心肌缺血改变阳性检出数23例;占总数63.89%;核素静息灌注显像显示心肌缺血改变阳性检出数24例,占总数66.67%,运动负荷灌注显像显示心肌缺血改变阳性检出数29例,占总数80.56%。放射性核素显像运动负荷灌注成像对心肌缺血显像与超声动态心电图阳性检测率比较存在显著差异(P0.05)。结论:放射性核素显像与超声心动图对心肌缺血诊断均有较高的临床价值,特别是运动负荷灌注显像技术显示心肌缺血更具有临床意义 相似文献
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通过潘生丁试验超声心动图技术，检测不典型心绞痛的左室收缩搏幅及左室功能演变规律。方法 对18例频繁胸痛患者，年龄40－57岁进行潘生丁超声负荷试验。结果：18例中，7例在潘生丁试验中出现胸痛发作，伴心电图改变，3例出现室壁运动异常，1例出现胸痛，但无心电图改变，其余7例检测过程中未出现异常。 相似文献
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目的 探讨风心病二尖瓣狭窄并发左房血栓患者行经皮二尖瓣球囊成形术(PBMV)安全性、效果及处置对策.方法 16例左房血栓患者术前经2～12周口服阿司匹林、华法令,皮下注射低分子量肝素钠,左房血栓消失或机化后行PBMV术,术中精细操作.结果 MVA0.88±0.33至2.10±0.47cm2,MVG17.3±4.8至4.63±1.74mmHg,术中无一例发生栓塞,未出现重度二尖瓣返流.结论 左房血栓仅为PBMV相对禁忌症,对左心耳、左房顶部血栓经充分抗凝后行PBMV术,操作恰当可与无血栓者取得相似效果. 相似文献
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冠心病患者血浆同型半胱氨酸变化及叶酸的干预治疗 总被引：1，自引：0，他引：1
目的 了解血浆同型半胱氨酸(Homocysteine，Hcy)、叶酸和维生素(Vit)B12水平与冠心病的关系；观察叶酸干预治疗高Hcy血症的疗效．方法 经冠脉造影确诊的冠心病患者97例、亚冠心病患者58例及完全正常3l例，用高效液相色谱法测血浆Hcy水平，用放免法测血浆叶酸和VitB12浓度．其中高Hcy血症病人每天服用叶酸5mg，观察4周和8周后血浆Hcy水平变化．结果 冠心病和亚冠心病患者血浆Hcy水平明显高于正常人，叶酸和VitB12水平则明显下降；冠心病患者冠脉病变支数越多，血浆Hcy升高和叶酸、VitB12下降越明显；叶酸治疗高Hcy血症患者4周和8周，分别使血浆Hcy水平下降12．5％和38．5％．结论 冠心病和亚冠心病患者血浆Hcy水平明显升高，高Hcy血症是冠心病的危险因素之一．血浆Hcy水平变化与冠脉病变程度正相关．叶酸干预治疗可使高Hcy血症患者血浆Hcy浓度明显降低． 相似文献
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目的 探讨高原地区彩色多普勒超声在诊断下肢深静脉血栓疾病中的应用价值.方法 对拟诊断为下肢深静脉血栓的112例病患进行彩色多普勒超声检查,观察并记录其解剖结构及血液动力学改变.结果 确诊下肢深静脉血栓102例、217条段病变血管,急性血栓124条段（57.14％）,亚急性、慢性血栓93条段（42.86％）,漏诊2例（1.79％）其他疾患8例（7.14％）.在不同时期的下肢深静脉血栓呈现不同的声像图特点.结论 声作为一种无创性检查,在下肢深静脉血栓的早期发现、病程进展及转归中均表现出快捷、安全、诊断率高等优点,是下肢深静脉血栓的可靠诊断手段. 相似文献
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《中国科学院院刊(英文版)》2008,22(1):2-3
CAS should stick to the principle of rendering service to, and giving impetus for, the development of China＇s science enterprise by making S＆T innovations, said CAS President LU Yongxiang. The CAS president made the remarks in a recent talk to communicate the gist of the winter session of the Party＇s Leading-member Group at CAS, which was held from 7 to 11 January in Beijing. 相似文献
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《中国科学院院刊(英文版)》2008,22(1)
With great care, Dr. ZHOU Zhonghe takes out a package wrapped by cotton tissue from a drawer and says: "This is the gem of our collections: the fossil of a bird that lived 125 million years ago!" Then, pointing at a tiny mound, he explains: "Look, this is the claw and that is the head. It was in the egg shell and ready to hatch ... The species fell into a family of waterside inhabitants." 相似文献
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Marjorie Armstrong-Stassen Margaret Landstrom Ramona Lumpkin 《The Information Society》1998,14(2):153-164
This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors. 相似文献
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A joint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology his co-workers from Norway US Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells suggesting that China's projected climate warming could decrease the pest's numbers. The study was published in Proceedings of the National Academy of Sciences on September .…… 《中国科学院院刊(英文版)》2008,22(1):6-7
Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007. 相似文献
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Caroline Haythornthwaite 《The Information Society》2001,17(3):211-226
A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction. 相似文献
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Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies. 相似文献
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Puay Tang 《The Information Society》1998,14(1):19-31
The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means. 相似文献
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Prof. SUN Changpu from the CAS Institute of Theoretical Physics coworkers from University of Basel in Switzerland have worked out a way - at least in theory - to split a beam of molecules according to their chirality. The technique involves passing the molecules through three different laser beams is similar to the famous Stern-Gerlach effect whereby a beam of atoms passing through a magnetic field is split in two according to the atoms' spin states 《中国科学院院刊(英文版)》2008,22(1):23-23
Prof. SUN Changpu from the CAS Institute of Theoretical Physics and coworkers from University of Basel in Switzerland have worked out a way --at least in theory --to split a beam of molecules according to their chirality. The technique involves passing the molecules through three different laser beams and is similar to the famous Stern-Gerlach effect, whereby a beam of atoms passing through a magnetic field is split in two according to the atoms＇ spin states （Phys. Rev. Lett. 99 130403）. 相似文献
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Milton Mueller 《The Information Society》2001,17(3):151-163
Long-standing conflict between domain name registrants and trademark holders prompted the Internet Corporation for Assigned Names and Numbers (ICANN) to create a global, mandatory arbitration procedure known as the Uniform Dispute Resolution Policy (UDRP). The UDRP has been used in 2166 cases involving 3938 domain names as of 1 November 2000. The policy gives the initiator of a complaint, generally a trademark holder, the right to choose which ICANN-accredited dispute resolution service provider (RSP) will handle the case. During the preparation of the UDRP,some feared that complainant selection would lead to "forum shopping" that might bias the results. This article performs a statistical assessment of the forum-shopping thesis and finds support for it. There are statistically significant differences in the various RSPs' propensity to take away names from defendants; there are also major differences in the number of cases brought to each RSP. RSPs who take away names have the larger share of cases. The study examines other variables that might explain differences in market share, such as price, the plaintiff's nationality, or the time taken to decide a case. It finds that nationality and time also are correlated with market share. The study concludes that shopping for a favorable outcome is an important factor in the UDRP. 相似文献
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Prof. Raymond C.K. Chen a neuropsychologist with the CAS Institute of Psychology has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology.…… 《中国科学院院刊(英文版)》2008,22(1):15-15
Prof. Raymond C.K. Chen, a neuropsychologist with the CAS Institute of Psychology, has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology. 相似文献