1,721,016 research outputs found
Thrombus contribution to very late restenosis of bare-metal stent treated by excimer laser angioplasty: in vivo assessment with optical coherence tomography
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"Fogarty-like" removal of large coronary thrombus.
No full textIn order to avoid distal embolization in patients undergoing emergency percutaneous coronary intervention for ST-elevation myocardial infarction, both thrombectomy and distal protection devices have been evaluated with conflicting effects on myocardial perfusion. However, the removal of massive coronary thrombus is always problematic, and failure of standard approaches might result in severe microvascular damage. We report a case of the unusual use, in a "Fogarty-like" fashion, of the Spidertrade mark filter to trap and remove a large thrombus that was refractory to aspiration and balloon dilatation before stent implantation in a proximal, infarct-related coronary artery
[Clinical value of inflammatory biomarkers after stent implantation]
No full textThe introduction of coronary stents into clinical practice has revolutionized the treatment of coronary artery disease. However, in-stent restenosis (ISR) and stent thrombosis represent the main adverse reactions following stent implantation. Along with procedural and technical factors, individual susceptibility, in particular the inflammatory response, play an important role in the development of these complications. C-reactive protein, one of the most extensively studied inflammatory biomarkers, was found to predict the risk of ISR but not of stent thrombosis in bare-metal stent (BMS)-treated patients. On the contrary, C-reactive protein failed to predict the occurrence of ISR in drug-eluting stent (DES)-treated patients, but it appeared to predict the risk of stent thrombosis. Important differences in the pathophysiological mechanisms of adverse reactions to BMS and DES account for the differences in the prognostic value of inflammatory biomarkers. Moreover, DES polymers are responsible for late hypersensitivity allergic reactions that may lead to late ISR and stent thrombosis. Notably, a correct employment of inflammatory biomarkers may become a useful tool for identification and management of high-risk patients. In this review, the evolving role of inflammatory biomarkers in predicting adverse reactions after stent implantation is discussed, underlying therapeutic and clinical consequences for the management of patients receiving a BMS or a DES
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Clues to a life-threatening disease
No full textSyncope, with its multiple underlying causes, represents a challenging clinical problem. Identification of the etiology, which can range from benign to potentially life-threatening disease, might require a complex diagnostic pathway.
We report the case of a 24-year-old man who presented to the outpatient clinic after 3 episodes of syncope at rest during the previous month. Each lasted a few seconds and was preceded by palpitations and lightheadedness. His past medical history included no significant findings, and he had no history of recent drug use. His father died suddenly at the age of 43 years
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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