1,721,042 research outputs found
Operative management of recurrent carotid restenosis following open and endovascular repair in the same carotid bifurcation
No full textSurgical treatment of carotid stenosis consists of carotid endarterectomy (CEA) or carotid stenting (CAS). Restenosis after CEA/CAS is a challenging issue that surgeons encounter with increasing frequency. Here, we report a case where we employed several techniques for the treatment of carotid restenosis that were complicated by restenosis. Within 2 years, the patient underwent carotid endarterectomy, stent placement in the common-internal carotid, stent placement in the intracranial internal carotid artery, explantation of an extra cranial stent graft, a saphenous graft interposition and repositioning of the extra cranial carotid stent. A standard for the operative management of recurrent restenosis has not been established. Recurrent restenosis can be treated with different surgical techniques, but those techniques can be complicated by restenosis
Endovascular versus open repair for popliteal artery aneurysm. A single center experience
No full textBACKGROUND: Endovascular repair of popliteal artery aneurysm (Paa) has emerged as a less invasive approach compared to the open repair, and recently there has been an increase in the number of endovascular procedures in many countries. We evaluated the outcomes in patients with PAA treated by endovascular and open approach during the same frame time at our institute. METHODS: A retrospective review to identify PAAs treated at our institute between January 2011 and January 2014 was performed. RESULTS: We identified 46 PAAs in 41 patients. Thirty PAAs underwent to open repair and 16 PAAs to endovascular repair. The median followup was 22 months (range 15-30 months) and 15 months (range 9-30 months) for the open and endovascular group respectively. Primary patency, limb salvage 30 days for open and endovascular group were 97% vs. 100% and 96% vs. 100% respectively. Median length of hospitalization was 7 vs. 2 days in the open and endovascular group respectively. In the open group the primary patency was at 1 and 2 years were 93%, in the secondary it was patency 100%, limb salvage 97%, survival rate 100%. In the endovascular group, primary patency was at 1 year 63%, secondary patency 100%, limb salvage 94%, survival rate 93%. In this group two stent thrombosis underwent successful thrombolysis and endovascular repair of the underlying causative lesion, while three patients needed conversion to open repair. CONCLUSIONS: The number of endovascular procedures is increasing in many countries and the results that have been reported are very different. In our opinion a randomized trial is necessary, and in the light of these results favorable for the open repair, also in patients considered to be at high risk for surgery, we recommend not to change the practice of the center
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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