1,720,986 research outputs found
TEVAR and EVAR: the new skyline
No full textIn the chapter are reported the technical and clinical news regarding the endovascular treatment of the aortic aneurysm
The computed tomography post-procesing softweare in the endovascular abdominal aneurysm planning
No full textThe imaging planning is a crucial point in EVAR. The computed tomography post-procesing softweare are riporte
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
Anaconda: the Italian Registry: Study protocol and preliminary perioperative results
No full textAIM:
AnacondaTM is an infrarenal stent-graft for the endovascular treatment (EVAR) of abdominal aortic aneurysms (AAA). The AnacondaTM Italian Registry is an observational multicentre registry that started in Italy on March 2009. The aim of this study is to present the registry protocol and to evaluate the interim perioperative results.
METHODS:
Patient data collected covered both retrospective and new cases. The case record forms are divided into preoperative data (population characteristics and clinical data), preoperative morphological data, intraoperative data, perioperative data (30-days from AnacondaTM implant) and follow-up record forms. The inclusion criteria are: AAA with a maximum sac diameter ≥ 5 cm, AAA with rapid expansion, symptomatic AAA or with a contained rupture, aorto-iliac aneurysms, proximal neck length ≥ 15 mm and diameter of the proximal aortic neck between 16 and 31.5 mm. No exclusion criteria were considered regarding aorto-iliac tortuosity, wall calcification or thrombosis and no exclusion criteria were considered regarding the patients age, comorbidities or life expectancy. Seven postoperative follow-up controls (visit and imaging) were required: at 30-days from the AnacondaTM implant, 6 months, 1 year and then annually up to 5 years. The registry is still open to new case enrollment.
RESULTS:
The reported results reflect the registry cases as at March 15, 2011. At this date, 787 cases were present in the database: 722 (91.7%) were male and 65 (8.3%) female. The mean patient age was 76.6 years with a range between 50 and 94 years. The ASA class was ≥ 3 in 635 patients (80.6%). The mean aneurysmal sac diameter was 55.73 ± 9.5 mm. The mean proximal aortic neck length was 26.52 ± 12.31 mm. Of the 787 patients treated, 11 cases of immediate surgical conversion were reported (1.3%). The overall 30-day mortality rate was 1.2% (10 cases): but 30-day death occurred in 0.9% of successful endograft implants and in 27.2% of surgical conversions (p<0.001). In fourteen cases (1.7%) an iliac leg thrombosis occurred and a native iliac artery thrombosis occurred in only five cases (0.5%). The 30-day overall occurrence of endoleaks was observed in 95 cases (12%): 5 cases of type I proximal endoleak (0.6%), 89 cases of type II endoleak (11.3%) and 1 case of type III endoleak (0.1%). No cases of endograft dislocation were reported.
CONCLUSION:
This is an interim report on the study protocol and on the preliminary early results. Presently there are no definitive conclusions, however the perioperative results show that the AnacondaTM endograft seems to be safe and effective in the treatment of AAA, even in a high risk cohort of patients. Definitive and long-term results are needed
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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