1,721,011 research outputs found
Systematic Review and Meta-analysis of Occurrence Rate, Treatments, and Outcomes of Vascular Graft and Stent Infections in the Supra-aortic Trunks
Full text linkObjective: This study aimed to systematically review and synthesise the available evidence on the management of vascular graft and stent infections in the supra-aortic trunks (SATs). Data sources: MEDLINE, Scopus, Cochrane databases, and citation searching. Review methods: All study designs (case reports and series, cohort studies, and trials) addressing treatments for post-operative infections of prosthetic vascular grafts and stents in the SAT were included. GRADE methodology was used to assess the certainty of evidence. Results: Seventy one studies were included in this systematic review. Fifty four were case reports and case series (215 patients) describing SAT infections following surgery. Among these, 11 studies with 149 patients who initially underwent carotid endarterectomy (CEA) with patch closure were included in the meta-analysis. The estimated infection rate after CEA with patch closure was 0.7% (95% confidence interval [CI] 0.4 - 0.9%). Surgical treatment was mostly based on complete removal of the infected material and in situ arterial reconstruction (82.2%, 95% CI 71.4 - 92.9%). Post-operative complications occurred in 25.9% (95% CI 16 - 35.9%). Cranial nerve injury occurred in 12.5% (95% CI 5.7 - 19.4%), with 28.4% (95% CI 5.2 - 57.4%) of these being permanent. Re-infections during a mean follow up of 37.7 months occurred in 3.4% of patients. Seventeen studies were case reports documenting SAT infections in 21 patients following endovascular treatment. Stent explantation was performed in 18 of 21 cases. A reconstruction to restore SAT flow was performed in 11 of 18 cases. GRADE analysis determined the certainty of evidence for all outcomes to be very low. Conclusion: Vascular graft and stent infections in the SAT are uncommon. The preferred treatment was removal of the infected graft and autologous reconstruction. Alternatives included drainage, stent relining, and antibiotics. Cranial nerve injuries were common, with one third resulting in permanent damage
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
Évolution volumétrique de la zone d'ancrage distale après traitement endovasculaire de la pathologie anévrismale aorto-iliaque pour des artères iliaques communes de plus de 17mm de diamètre
No full textMédecine. Chirurgie généraleObjectif : plusieurs techniques endovasculaires peuvent être proposées dans le cadre du traitement de la pathologie anévrismale aorto-iliaque. L’existence d’une zone d’ancrage distale adéquate est un des facteurs qui conditionne la pérennité du traitement endovasculaire, et notamment l’apparition d’endofuites. L’objectif de ce travail était d’étudier l’évolution volumétrique des artères iliaques communes ectasiques selon le type de traitement endovasculaire effectué, et de déterminer les facteurs de risque d’endofuite de type 1b. Méthode : Tous les patients consécutifs présentant une pathologique anévrismale avec une artère iliaque commune ≥ 17 mm, traités par voie endovasculaire entre janvier 2008 et décembre 2016 ont été inclus dans cette étude. Les patients ont été divisés en 4 groupes selon le type de traitement endovasculaire réalisé : la mise en place d’une endoprothèse évasée (groupe BBT), la mise en place d’une endoprothèse jusqu’au niveau de l’artère iliaque externe avec embolisation de l’artère iliaque interne (groupe E+) ou sans embolisation (groupe E-), et la mise en place d’une endoprothèse branchée iliaque (groupe IBE). L’évolution volumétrique de la zone d’ancrage distale a été analysée pour chaque patient via des reconstructions scannographiques réalisées en pré opératoire, puis à 6 mois, 1 an et 2 ans post-opératoires. Une analyse multivariée a été réalisée afin de déterminer les facteurs de risque d’endofuite de type 1b. Résultats : 74 patients présentant 110 artères iliaques ≥ 17 mm (groupe BBT : n= 58 ; groupe E+ : n= 12 ; groupe E- : n=3 ; groupe IBE : n=37) ont été traités. La durée moyenne de suivi était de 120,1 mois (médiane 96,5, IQR 45,3). L’évolution volumétrique moyenne était significativement différente dans le groupe BBT : + 14,2 % (médiane 19,9%) comparée au groupe E + : - 30,5 % (médiane -30,3%), au groupe E- : - 20,3% (médiane -20,3%) et au groupe IBE : - 18,2 % (médiane – 18,9%) ; p -0,001. La mise en place d’une endoprothèse évasée est apparue comme facteur de risque d’endofuite de type 1b. (OR 7,13 ; IC 95 [1,58-3,04] ; p-0,001). Conclusion : L’évolution volumétrique post-opératoire des artères iliaques communes ectasiques diffère selon la technique endovasculaire utilisée. L’utilisation des endoprothèses évasées est associée à une augmentation de volume et à un risque d’endofuite important, témoignant d’une moindre pérennité de cette technique.Objectives: the aim of this study was to assess the postoperative volumetric evolution of the distal sealing zone for common iliac arteries (CIA) ≥ 17 mm regarding the type of endovascular technique performed and to assess risk factors for type 1b endoleak. Materials and methods: All consecutive patients presenting with aneurysmal disease with CIA ≥ 17 mm treated endovascularly from January 2008 to December 2016 were included. Patients were divided in four groups regarding the type of endovascular technique performed: bell-bottom technique (BBT group), external iliac artery (EIA) graft extension with internal iliac artery (IIA) embolization (E+ group), EIA graft extension without IIA embolization (E- group) and iliac-branched stent graft (IBE group). Volumetric evolution of the distal sealing zone was assessed for each patient through reconstructions on computed tomography angiography performed preoperatively, at 6-month, 1-year and 2-years. Multivariate analysis was performed in order to identify risk factors for type 1b endoleak. Results: From 2008 to 2016, 74 patients including 110 CIA ≥ 17 mm (BBT group: n = 58; E+ group: n =12; E- group: n = 3; IBE group: n = 37) were treated. Mean follow-up was 120.1 months (median 96.5, IQR 45.3). Mean volumetric evolution significantly differed in BBT group + 14.2% (median 19.9 %) compared to E+ group: - 30.5% (median -30.3%), E- group: - 20.3% (median -20.3%) and IBE group: -18.2% (median -18.9%); p - 0.001. The bell bottom technique appeared as a risk factor for type 1b endoleak (odd ratio: 7.13; 95% confidence interval: [1.58-3.04]; p - 0.001). Conclusions: The postoperative volumetric evolution of CIA ≥ 17 mm differs regarding the endovascular technique performed. The bell-bottom technique is associated with an increase in postoperative volume and can be consequently considered as risk factor of type 1b endoleak
Calcium in the (Big) Pipes: Intra-TEVAR Calcifications!
Full text linkIntroduction: Calcification of a vascular endograft and adjacent tissues (adventitia, media, and neointima) can result in graft failure. This report shows a rare case of intraluminal calcifications in the distal end of a thoracic endovascular aortic repair (TEVAR) endograft implanted 11 years previously for grade IV blunt traumatic aortic injury (BTAI) in a young patient. Report: A 24 year old man required TEVAR for a BTAI caused by a motorcycle accident. The procedure consisted of TEVAR and an emergency left carotid subclavian venous bypass. Eleven years after the procedure, he had severe hypertension. Intra-TEVAR calcifications appeared, gradually increasing on computed tomography angiography (CTA). Calcifications in the distal luminal end of the TEVAR were responsible for a 60% stenosis on CTA. An open approach was indicated after multidisciplinary discussion, based on the gradient value. The patient underwent explantation, with total replacement of the aortic arch and descending thoracic aorta with re-implantation of the supra-aortic vessels, under extracorporeal circulation. Macroscopic analysis showed no device degeneration but revealed a solid mass at the distal end of the TEVAR. Both microcomputed tomography and histopathology confirmed the calcific nature of the lesions. Conclusion: This case highlights a rare long term graft failure due to calcified neo-atherosclerosis in a TEVAR. (c) 2023 The Authors. Published by Elsevier Ltd on behalf of European Society for Vascular Surgery
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
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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