1,720,977 research outputs found
A New Endovascular Approach to Exclude Isolated Bilateral Common Iliac Artery Aneurysms
No full textAbstractA new endovascular procedure is reported to treat bilateral common iliac artery (CIA) aneurysms extending to both iliac bifurcations.The left internal iliac artery (IIA) was first embolised, two overlapped Viabahn endografts were delivered from the right IIA to the distal aorta and, finally, CIA aneurysms excluded using iliac contralateral leg and extension endografts from the distal aorta to both external iliac arteries, applying a combined ‘chimney-graft/double-barrel’ technique.This procedure may extend the limits of conventional iliac endografting by preserving blow flow to at least one IIA using off-label commercially available devices, avoiding associated open surgical procedures
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
Open and endovascular repair of infected femoral artery pseudoaneurysms in intravenous drug abusers: results from the Italian "IN-FEMS" (INfected Femoral artery psEudoaneurysMs in drug addictS) multicentric Registry
No full textObjective: Infected femoral artery pseudoaneurysms (IFAPs) are threatening complications of voluntary drug injections in the groin. The purpose of this study is to report the results of open and endovascular repair of IFAPs in intravenous drug abusers. Methods: The IN-FEMS (INfected Femoral artery psEudoaneurysMs in drug addictS) is a physician-initiated, multicenter and retrospective registry of patients treated for native IFAPs between 2010 and 2023 in 18 different Italian Vascular Surgery Departments. Primary endpoints included perioperative death rates, surgical reconstructions durability, major amputation rates and reintervention rates. Additionally, antimicrobial activity of different biological and synthetic vascular grafts was tested using agar plates seeded with methicillin-resistant staphylococcus aureus. Results: 100 consecutive procedures (94 patients, 6 with bilateral IFPAs) were included in the study. Two groups were analized: open repair group (A, n= 83) and endovascular repair group (B, n= 17). Medium age of the patients was 41.7 ± 9.2, with a high percentage of patients positive for drug related infectious diseases. The most frequent surgical procedures included common femoral artery (CFA) reconstruction with a single straight tube (n= 24, 24.0%), followed by external iliac artery (EIA) - CFA bypass (n= 18, 18.0%). 8 patients were treated with arterial ligation (8%). 12 (12.0%) patients received a stenting of the EIA-CFA. Perioperative death rate was 2.0%. The overall survival rate after 48 months was 76.5% (standard error 0.06). A statistically significant difference in terms of grafts durability was observed among 3 subgroups of patients treated with open surgery with different conduits (autologous vein/cryopreserved allografts; pericardium/biosynthetic composite grafts; prosthetic grafts - respectively 78.4%, 80% and 33.5%; log rank p=0.024). Major amputation was similar for both open and endovascular groups (respectively 1.2% and 5.9%, p= .313). A significant difference was observed in terms of reintervention rates: group A showed a lower rate of reinterventions compared with group B (37.4% vs 64.7%, p= .037). Microbiological evaluation showed that autologous great saphenous vein (GSV) and reinforced cryopreserved saphenous vein (CSV) present a strong intrinsic antimicrobial activity compared to prosthetic grafts. Conclusions: Endovascular repair appears a technically feasible solution that doesn't compromise the limb salvage rates; however, the reintervention rates are significantly higher in patients treated with endovascular techniques, which should be considered as "bridge therapy". Open surgery seems to be the safest and most durable solution to treat these complex cases. The use of synthetic grafts should be limited to those patients "without alternative options", when autologous or biosynthetic materials are not available
Applications of Three-Dimensional Printing in the Management of Complex Aortic Diseases
Full text link: The use of three-dimensional (3D) printing is gaining considerable success in many medical fields, including surgery; however, the spread of this innovation in cardiac and vascular surgery is still limited. This article reports our pilot experience with this technology, applied as an additional tool for 20 patients treated for complex vascular or cardiac surgical diseases. We have analyzed the feasibility of a "3D printing and aortic diseases project," which helps to obtain a more complete approach to these conditions. 3D models have been used as a resource to improve preoperative planning and simulation, both for open and endovascular procedures; furthermore, real 3D aortic models were used to develop doctor-patients communication, allowing better knowledge and awareness of their disease and of the planned surgical procedure. A 3D printing project seems feasible and applicable as an adjunctive tool in the diagnostic-therapeutic path of complex aortic diseases, with the need for future studies to verify the results
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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