1,720,972 research outputs found
Aortic valve replacement with right thoracotomy in a patient with sternal metastasis from renal carcinoma.
No full textWe present a clinical case of severe aortic stenosis in a 73-year-old patient symptomatic for dispnoea class NYHA III-IV. At the physical examination the patient presented a single sternal metastasis of renal carcinoma involving the sternum. Oncological stability prompted us to perform aortic valve replacement. In order to avoid median sternotomy and its complications due to the presence of sternal metastasis we successfully performed aortic valve replacement through a right minithoracotomy
A Case of Type I Debranching Complicated by Anastomotic Pseudoaneurysm: Do Not Ask Too Much of the Ascending Aorta.
No full textTreatment of aortic arch aneurysm with standard open surgery is technically demanding, and associated morbidity and mortality are not insignificant. In high-risk patients, hybrid procedures with debranching and reimplantation or bypass of the aortic arch vessel followed by thoracic endovascular aortic repair (TEVAR) in the aortic arch represent a valid alternative to open surgery. However, when the ascending aorta is mildly dilated, the risk of retrograde dissection increases sharply. Here,we report a case of thoracic aortic aneurysm, with normal ascending aorta diameter, treated with Type I debranching and anterograde TEVAR complicated by anastomotic pseudoaneurysm and acute endocarditis, treated ultimately with ascending aortic repair and aortic valve replacement
Aortic valve replacement with right thoracotomy in a patient with sternal metastasis from renal carcinoma.
No full textWe present a clinical case of severe aortic stenosis in a 73-year-old patient symptomatic for dispnoea class NYHA III-IV. At the physical examination the patient presented a single sternal metastasis of renal carcinoma involving the sternum. Oncological stability prompted us to perform aortic valve replacement. In order to avoid median sternotomy and its complications due to the presence of sternal metastasis we successfully performed aortic valve replacement through a right minithoracotomy
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
Unusual Locations for Cardiac Papillary Fibroelastomas.
No full textPapillary fibroelastomas (PFEs) are rare and benign cardiac tumors which usually are localized on the valves (mostly on the aortic valve), though they may originate also from the ventricles or atrial walls. Whilst, in the large majority of cases, these lesions are asymptomatic they may cause serious complications such as thromboembolic events, or more rarely valvular dysfunctions. Surgical excision is necessary for a symptomatic lesion. The management of asymptomatic lesions is not defined. Herein are reported the details of a miniseries of six cases operated on at the authors' institution between 2005 and 2015. A review of the current literature suggests that PFE is a rare but potentially treatable cause of thromboembolic events, and must be borne in mind during the differential diagnosis of cardioembolic stroke. The surgical excision of PFEs is safe and definitive
Non-A non-B aortic dissection: a systematic review and meta-analysis
No full textOBJECTIVES: Non-A non-B aortic dissections are rare, and little is known about their natural history, indications for surgery and operative results. We aim to examine the literature to summarize what is known of the natural history of non-A non-B dissections and evaluate the outcomes of the therapeutic options available. METHODS: An extensive literature search was performed using MEDLINE to find all published studies that report data on the natural history and outcomes of patients with non-A non-B aortic dissection. Data on patients treated with medical therapy were extracted to characterize the natural history. Primary end points included 30-day mortality, stroke and retrograde type A dissection. RESULTS: Of the 423 studies found, 14 articles (433 patients) fulfilled the inclusion criteria for quantitative analysis. The proportion of medically treated patients ranged from 5 to 54% with a pooled rate of 36% (50/138). The 30-day mortality of patients treated with medical therapy was 14% (7/50). The overall estimated proportion of 30-day mortality for patients who underwent intervention was 3.6% [95% confidence interval (CI) 1.7-5.6%], retrograde type A dissection was 2.6% (95% CI 0.8-4.4%) and stroke was 2.8% (95% CI 1.0-4.5%). CONCLUSIONS: Despite the likelihood of reporting and selection bias, patients with non-A non-B dissection often have a complicated course requiring some form of intervention. The 30-day mortality of patients treated with medical therapy seems higher than surgical or endovascular therapy. Ideally, further large prospective studies are necessary to confirm our suggestion that early intervention may be indicated in non-A non-B dissections
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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