1,720,964 research outputs found
New data and clinical results supporting the use of directional atherectomy for infrainguinal peripheral artery disease
No full textEndovascular treatment of atherosclerotic femoropopliteal lesions is increasing, primarily because peripheral artery disease is very common and tends to recur after the first procedure, secondly because new techniques are becoming available. PTA and stenting are no longer the only treatments available and although there is still no agreement on the gold standard for the treatment of infrainguinal lesions, some studies have been conducted in order to give an answer. This review takes into account recent studies and clinical data to support the use of directional atherectomy
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
Preliminary results in endovascular treatment of abdominal aortic aneurysms by trivascular ovation endoprotesis: report of the experience of two centers of vascular surgery
No full textAim. We report our preliminary experience with the use of the TriVascular Ovation endograft system for the treatment of abdominal aortic aneurysms (AAA). Methods. Data from patients treated for AAA using the Ovation endograft at two centers from January 2011 to September 2012 were retrospectively collected and reviewed. Main outcomes included primary success, survival, complications, and device-related events at 30-days. Results: Thirty-seven patients (male: 95%, mean age: 76 yr) were treated for AAA (mean diameter: 54 mm) with the Ovation endograft, mainly using local or regional anesthesia (86.5% of cases). Percutaneous femoral access was utilized in 73% of cases. Primary success was achieved in 89.2% of cases, as 4 adjunctive procedures were required including two distal extensions (type 1b endoleak and iliac limb disconnection resulting in type III endoleak) and two bypass surgeries (limb graft occlusion and gate cannulation failure). No deaths, major complications, endoleaks, AAA enlargement, AAA rupture, stent fracture, migration, or endovascular or surgical reintervention were reported at 30-days. Conclusion. Our initial experience with the Ovation endograft demonstrated encouraging 30-day results for the treatment of AAA
Post-implantation syndrome after endovascular aortic repair using The AnacondaTM endograft
No full textBACKGROUND:
We report our retrospective experience on postimplantation syndrome (PIS) after the use of AnacondaTM endograft in patients undergoing elective endovascular repair of abdominal aortic aneurysms (EVAR).
METHODS:
Data of all patients undergoing elective EVAR between May 2000 and June 2013 using the Anaconda endograft were retrospectively reviewed and the outcomes were analyzed. Preoperative and intraoperative data, any early postoperative complications, length of in-hospital stay, incidence of PIS, and long-term complications were recorded in a database. Patients' quality of life (QOL) was also assessed at 1 month after the procedure. Statistical analysis was performed and P values ≤0.05 were considered statistically significant. Chi-squared tests, log-rank tests, Wilcoxon tests, and Kaplan-Meier survival analysis were performed as appropriate.
RESULTS:
Between May 2000 and June 2013, 118 patients (8 female, 6.7%) underwent elective EVAR using the Anaconda endograft. Primary success was obtained in 117 cases (99.1%). Patients were divided into 2 groups based on either the occurrence of PIS (group A: 24 patients, 20.3%) or not (group B). The length of the procedure and the in-hospital stay were longer for group A. One patient from group B died on second postoperative day from myocardial infarction (0.8%). Mean follow-up was 48.4 months (range 5-162 months). Seven endoleaks occurred in the long term regardless of the development of PIS. We did not find any correlation between the presence of PIS and the occurrence of long-term complications, but PIS was correlated to the preoperative burden of thrombus of the aneurysmal sac. On the other side, analysis of QOL surveys showed that patients who had PIS after surgery felt significantly more limited in carrying out their daily physical activities and were more emotionally discouraged and depressed/anxious about their state of health than the group that did not have PIS.
CONCLUSIONS:
In our experience, the occurrence of PIS was related to the duration of the procedure and the preoperative burden of thrombus of the aneurysmal sac. Overall, PIS was a benign complication after EVAR using the Anaconda endograft. However, it affected significantly the length of the in-hospital stay. Moreover, patients who had PIS after surgery felt significantly more limited in carrying out their daily physical activities and were more emotionally discouraged and depressed/anxious about their state of health than the group that did not have PIS
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