1,720,975 research outputs found
Cardiovascular risk factors and HIV disease.
No full textAn increased rate of coronary heart diseases is becoming an important cause of morbidity and mortality among HIV-infected patients. This emerging problem is due to the antiretroviral therapy success that allows HIV-positive patients to live longer. Increased coronary heart disease rates in the HIV population, as in the noninfected population, may be related to traditional risk factors, including advancing age, higher smoking rates, dyslipidemia, insulin resistance, and impaired glucose tolerance. Some nontraditional factors have to be considered too: these are due to the direct effects of the virus on the vasculature, as well as to direct effects of specific antiretroviral drugs, including inflammation, endothelial dysfunction, metabolic disorders, prothrombotic state, and changes in body composition with loss of subcutaneous fat and/or accumulation of visceral fat. The aim of this paper is to review traditional and emerging cardiovascular risk factors and consider their possible interactions in HIV-infected patients
Echocardiographic visualization of retroaortic anomalous coronary artery
Full text linkThe anomalous aortic origin of the left coronary artery from the right coronary sinus is a rare congenital anomaly. Transthoracic echocardiography (TTE) has limited accuracy to detect coronary anomalies in adults. A highly specific TTE finding (RAC sign) has been recently described as strongly associated to retroaortic anomalous coronary course. Cardiologists should be aware of the appearance and significance of the RAC sign, so that it is not ignored or misdiagnosed
Fibroelastoma of the papillary muscle mimicking a left ventricular myxoma
No full textWe reported a case of left ventricular polypoid mass, incidentally found in an asymptomatic 75-year-old female with history of systemic sclerosis, pulmonary hypertension, and transient ischaemic attacks
Giant coronary aneurysm and acute myocardial infarction: clinical case report and literature review
No full textCoronary artery aneurysm (CAA) is defined as a localized dilatation of a coronary artery that is larger than the diameter of the adjacent normal vessel by 1.5–2 times [1, 2]. Fusiform aneurysms, with the longitudinal diameter larger than the transversal one, are more common than saccular ones [3]. Most frequently, the right coronary artery (RCA) is involved (40.4%) [4, 5]. In rare cases, if the dilated segment is more than 20 mm in diameter, CAAs are called “giant CAA” (GCAA), which have been reported to have an incidence of 0.02% [6, 7]. The occurrence of multiple CAAs located in more than one coronary artery is even more uncommon [8]. The presence of aneurysmal dilation of coronary vessels may be defined as CAA or coronary artery ectasia (CAE); however, CAE indicates a more diffuse dilatation including 50% or more of the length of a coronary artery. The purpose of this manuscript is to discuss the currently available different therapeutic options of the CAAs and to report our experience with a clinical case of multiple CAAs with GCAA
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
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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