1,721,101 research outputs found
Guidewire fracture: an unusual complication of percutaneous transluminal coronary angioplasty
No full textIs it Reasonable to Treat All Calcified Stenotic Valves With a Valve Stent? Probably Yes If We Get a Full Stent Expansion
No full textOnset and progression of fatal coronary dissection during angiography.
No full textCoronary angiography was performed in a 43-year-old man admitted to hospital for chest pain. The first frames after the injection of contrast medium showed plaque in the left main coronary artery and subtotal stenosis of the mid-left anterior descending coronary artery. Dissection of the left main coronary artery appeared, with intimal flaps at the proximal segment of the main trunk and the origin of the left anterior descending artery. Dissection rapidly progressed into the circumflex artery and left anterior descending coronary artery. Although two stents were deployed in the left main coronary artery, the patient died of ventricular fibrillation
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
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
Detection of coronary artery disease in asymptomatic patients with type 2 diabetes mellitus
No full textWe sought to verify the effectiveness of current American Diabetes Association screening guidelines in identifying asymptomatic patients with coronary artery disease (CAD) in type 2 diabetes mellitus (DM2).
BACKGROUND In DM2 patients, CAD generally is detected in an advanced stage with an extensive atherosclerosis and poor outcome, whereas CAD in an asymptomatic stage is commonly
missed.
METHODS This study included 1,899 asymptomatic DM2 patients (age >60 years). Of these, 1,121 had >2 associated risk factors (RFs), group A, and the remaining 778 had >1 RF, group B, for
CAD. All patients underwent dipyridamole myocardial contrast echocardiography (MCE), and in those with myocardial perfusion defects, the anatomy of coronary vessels was analyzed
by selective coronary angiography.
RESULTS In the two study groups, the prevalence of abnormal MCE (59.4% vs. 60%, p < 0.96) and
of a significant CAD (64.6% vs. 65.5%, p <0.92) was similar, irrespective of RF profile. But coronary anatomy differed: group B had a lower prevalence of three-vessel disease (7.6% vs.
33.3%, p <0.001), of diffuse disease (18.0% vs. 54.9%, p 0.001), and of vessel occlusion (3.8% vs. 31.2%, p <0.001), whereas one-vessel disease was more frequent (70.6% vs. 46.3%, p < 0.001). Coronary anatomy did not allow any revascularization procedure in 45% of group A patients.
CONCLUSIONS An “aggressive” diagnostic approach, requiring coronary angiography in asymptomatic DM2 patients with >1 associated RF for CAD and abnormal MCE, identified patients with a subclinical CAD characterized by a more favorable angiographic anatomy. The criterion of >2 RFs did not help to identify asymptomatic patients with a higher prevalence of CAD and is only related to a more severe CAD with unfavorable coronary anatomy
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