1,720,956 research outputs found
Dilated Right Ventricle with Impaired Systolic Function
Get PDFWe describe a 50-year old female admitted to our cardiac department with an episode of palpitations and associated dyspnea. She had never had any previous medical history. Physical examination revealed an irregular heart rate of 130 beats per minute, blood pressure of 122/70 mmHg and no pyrexia. Twelve–lead ECG demonstrated atrial fibrillation. Transthoracic echocardiogram showed a dilated right ventricle... (excerpt
Angiosarcoma of the Heart: from Primary Location to Rapid Extension
Get PDFA 68-year-old man was admitted to our department with severe dyspnea and hemodynamic instability. The initial echocardiogram revealed a massive pericardial effusion with signs of tamponade. Urgent pericardiocentesis was performed. The cytological examination of the pericardial fluid was negative for malignant cells but the pre-discharge transthoracic echocardiogram depicted a heterogeneous tissue (mass) in the right atrium. The subsequent transesophageal echocardiogram revealed a large sessile heterogeneous mass adherent to the right atrial free wall, extending into the inferior vena cava... (excerpt
Aortic Dissection Involving the Ostium of Left Main Coronary Artery
Get PDFΑ 58-year-old hypertensive man was referred from another hospital with diagnosis of myocardial infraction. He presented with a two hour sudden onset of severe chest pain radiating to his interscapular region. Pain did not respond to IV administration of nitrates and morphine. His blood pressure was 110/70 mmHg and physical examination revealed no murmurs The ECG showed extensive ST-segment elevation in the anterior and lateral leads suggesting acute anterior myocardial infarction. A transthoracic echocardiogram (TTE) demonstrated a dilated ascending aorta with an intimal flap that extended from the aortic valve to the mid-ascending aorta, (Figure 1) consistent with a Stanford type A acute aortic dissection (AAD). A multiplane transoesophageal echocardiogram (TOE) was then performed showed AAD extending into the aortic arch, the take-off of the left subclavian artery (Figure 2) and the descending aorta (Figure 3). The intimal flap was thin, smooth showed a pulsatile mobility with systolic convexity towards the false lumen (Figure 4). Flow was present in the false lumen which was larger than the true lumen (Figure 5). The left coronary ostium seemed to be obstructed by prolapse of the intimal flap during diastole (Figure 6). The aortic valve was normal and mild aortic regurgitation was noted caused by the aortic dilatation. Regional and global left ventricular function was normal.There were no periaortic or pericardial fluids. The patient was transferred for emergency surgery and the ascending aorta was successfully replaced by a supracoronary interposition prosthetic graft
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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