1,721,053 research outputs found
Thrombosis of mechanical heart valve prostheses: revisiting the role of fluoroscopy
No full textProsthetic valve thrombosis is a rare but potentially fatal complication of heart valve replacement. Symptoms may be misleading, yet the condition may rapidly lead to death. A prompt diagnosis is therefore crucial. Ultrasound is the most often used technique for evaluating prosthesis dysfunction. We describe two cases of prosthesis thrombosis with negative Doppler results but with distinctly abnormal leaflet motion at fluoroscopy. A correct diagnosis would have been missed if the Doppler evaluation alone was relied on. Fluoroscopy should always form part of the diagnostic work-up in patients with artificial heart valves
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
An unusual case of coronary fistula diagnosed by multidetector computed tomography
No full textWe present a case of a 82-year-old hypertensive woman who underwent multidetector computed tomography angiography because of chest pain, with detection of a large coronary fistula that originated from the anastomosis between left anterior descending coronary artery and posterior descending artery, in correspondence with the left ventricular apex, and drained into the right atrium and the proximal portion of the right coronary arter
Letter to the editor regarding: comparison of dual-source CT angiography and MR angiography in preoperative evaluation of intra- and extracranial vessels: a pilot study
No full textA very unusual form of localized hypertrophic cardiomyopathy : complementary role of echocardiography and high resolution multidetector computed tomography
No full textWe describe a case of a rare form of hypertrophic cardiomyopathy in a 53-year old man. Peculiar anatomic features of a massive hypertrophy of the anterior and lateral free wall of the left ventricle were clearly suspected on transthoracic echocardiography and precisely recognized through cardiac multidetector computed tomograph
Analisi dei multimeri del fattore von Willebrand mediante doppia immunoprecipitazione dopo elettroforesi su gel di agarosio.
No full textDiagnostic work-up of unselected patients with suspected coronary artery disease : complementary role of multidetector computed tomography, symptoms and electrocardiogram stress test
No full textWe evaluated the accuracy of multidetector computed tomography in detecting coronary artery disease and how it could change the indication to coronary angiography in patients with suspected cardiac chest pai
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
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