1,720,955 research outputs found
Papillary fibroelastoma in an unusual location: arising from the left atrial endocardium
No full textAbstract Papillary fibroelastoma (PFE) is a rare, benign cardiac tumor, often asymptomatic and typically arising from the valvular endocardium. While predominantly located on the heart valves, involvement of the atrial chamber is exceptionally uncommon. This case report presents a 34-year-old female with a history of ischemic stroke, in whom a left atrial mass was subsequently identified. Notably, the tumor was attached to the left atrial endocardium near the left atrial appendage orifice and the anterior mitral leaflet, an unusual location for PFE that made diagnosis difficult. Initially suspected to be a myxoma, the lesion was definitively diagnosed as a papillary fibroelastoma following histopathological examination. This case underscores the importance of advanced imaging techniques, meticulous preoperative evaluation, and histological confirmation in diagnosing and managing cardiac tumors in unusual locations
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
Subacute right ventricular perforation from a passive fixation pacemaker lead - a multidisciplinary diagnostic and management work-up
No full textПроцедурата за имплантиране на сърдечни имплантируеми електронни устройства (CIEDs) има процент на усложнения от около 5-6% според повечето проучвания. Перфорацията от електрод е възможно и сериозно нежелано събитие, което може да се прояви със спектър от симптоми – от липса на такива до внезапна сърдечна смърт. Средствата за диагностика при съмнение за перфорация са рентгеново изследване, трансторакална ехокардиография, изследване на пейсмейкърната функция и компютърна томография, като последната е златен стандарт. Екстракццията на електрода, довел до перфорацията, може да се извърши ендоваскуларно или хирургично. Трансвенозното отстраняване е възможна опция за електродите с активна фиксация, докато отстраняването на електродите с пасивна фиксация е за предпочитане да се извърши хирургично, поради обемистия връх на електрода, който може да увреди сърдечните кухини и съдовете. В тази статия представяме случай на масивна вентрикуларна перфорация от камерен електрод с пасивна фиксация, допълнително усложнена от сърдечна тампонада. Хирургичното отстраняване беше лечението на избор в нашия случай, с последващо имплантиране на постоянен двукухинен електрокардиостимулатор. Cardiac implantable electronic devices (CIEDs) implantation procedure has a complication rate of 5-6% according to most studies. Lead perforation is a possible and serious adverse event which can present with a spectrum of symptoms from asymptomatic to sudden death. Diagnostic tools in case of suspected lead perforation are X-ray, transthoracic echocardiography, pacemaker interrogation and computed tomography with the last one being the gold standard. Lead extraction could be done endovascularly or surgically. Transvenous removal is a possible option for active fi xation leads, while removal of passive fi xation leads is preferably done surgically, because of the bulky tip of the lead, which could damage the heart chambers and the vessels. In this article, we present a case of a massive ventricular perforation from a passive fi xation lead, further complicated by a cardiac tamponade. Surgical removal was the treatment of choice with subsequent implantation of a permanent dual-chamber pacemaker.
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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