1,721,018 research outputs found
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
Recovery of baseline renal function after treatment for prolonged in-stent artery thrombosis, in a COVID-19 positive patient: a case report
Full text linkObjective: Acute renal in-stent thrombosis is common, especially after complex endovascular treatments, or in case of risk factors such as Covid-19 infection. Irreversible renal damage occurred when the renal artery was occluded for more than 3 hours. In this case, we present a case of renal function recovery after
thromboaspiration of a renal stent thrombosis for more than 72 hours.
Case presentation: A 88-year-old man who tested positive for COVID-19 presented to the emergency room with dyspnea and anuria. He referred a previous complex endovascular intervention with the triple chimney technique (ChEVAR). More than 72 hours passed between the onset of symptoms to the diagnosis of acute renal intra-stent thrombosis. He underwent urgent thromboaspiration with neurovascular devices returning to his baseline renal function.
Conclusion: Despite the prolonged ischemia, renal revascularization with thromboaspiration restored renal function and rescued the remaining renal parenchym
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
Coronaric stent-graft deployment in the treatment of carotid blowout
No full textbackgroun and purpose: some reports of reconstructive management of carotid blowout syndrome (CBS) with stent-grafts are promising, but some are unfavorable. this study sought to evaluate the hemostatic efficacy, safety, and outcome of reconstructive, endovascular stent-graft placement in patients with head-and-neck cancers in association with CBS.
methods: eight patients with head-and-neck cancers with CBS were treated with self-expandable stent-grafts. we evaluated the initial hemostatic results, complications, and outcomes by assessing the clinical and imaging findings.
results: Immediate hemostasis was achieved in all patients. Initial complications included stroke in 1 patient and asymptomatic thrombosis of the carotid artery in 2 patients. delayed complications included rebleeding, delayed carotid thrombosis, and brain abscess formation. Rebleeding was noted in 4 patients and was successfully managed with a second stent-graft and embolization in 2 of them. delayed carotid thrombosis with follow-up after 3 months was found in 3 patients, 1 of whom had associated brain abscesses.
conclusion: although stent-grafts achieved immediate and initial hemostasis in patients with head-and-neck cancers and CBS, long-term safety, stent patency, and permanency of hemostasis appeared unfavorable. this treatment may be for temporary or emergency purposes rather than serving as a permanent measure. we suggest its applications in patients with acute CBS that precludes performance of an occlusion test, as well as when carotid occlusion poses an unusually high risk of neurologic morbidity. we also propose prophylactic antibiotic treatment and combined embolization of pathologic vascular feeders to improve outcomes.
carotid blowout refers to rupture of the carotid artery and its branches.1–4 It is one of the most devastating complications associated with therapy for head-and-neck cancers. the clinical signs and symptoms related to rupture of the carotid artery have been referred to as carotid blowout syndrome (CBS). carotid blowout tends to occur in patients with head-and-neck cancers and radiation-induced necrosis, recurrent tumors, or pharyngocutaneous fistulas.2 the reported neurologic morbidity and mortality rates associated with this complication are 40% and 60%, respectively.3 surgical management of carotid blowout is usually technically difficult because exploration and repair of the previously irradiated field are difficult. endovascular therapy with either permanent balloon occlusion or stent deployment is reportedly a good alternative to surgery.1–5
as many as 15%–20% of patients with CBS who are treated with permanent balloon occlusion have immediate or delayed cerebral ischemia.1,6 a balloon occlusion test may be performed before threatened CBS is treated definitively, but this test is usually not possible in acute cases. additionally, test occlusion may not help identify the small subset of patients in whom delayed hemodynamic ischemia develops after the internal carotid artery (ICA) is permanently occluded.1–3 reconstructive endovascular management of CBS seems reasonable to achieve hemostasis and to prevent neurologic morbidity. however, some reports of limited cases show unfavorable long-term outcomes after the deployment of foreign bodies into a field with ongoing contamination.5,7 such studies suggest preserving flow in the artery adjacent to ongoing cancer and infection can leave the patient at a higher risk of delayed complications (eg, subsequent bleeding or stent occlusion) than with carotid sacrifice. the purpose of this study, therefore, was to evaluate the hemostatic efficacy, safety, and outcome of endovascular reconstruction with self-expandable stent-grafts to manage carotid blowout in patients with head-and-neck cancer
D-dimer as an indicator of prognosis in SARS-CoV-2 infection: a systematic review
No full textBackground: Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) stimulates pro-thrombotic
changes. This, combined with its tropism for endothelium and lung structures, may explain its association with
thrombotic events, reduction of pulmonary gas exchange, acute respiratory distress syndrome (ARDS) and a
composite end-point (intensive care unit, invasive ventilation, death). This study aims to highlight the
correlation between elevated D-dimer (an indirect thrombosis marker) and the increased rate of poor prognosisassociated
conditions, and to introduce D-dimer-labelled anticoagulant administration as a potentially useful
tool to prevent complications and positively influence coronavirus disease 2019 (COVID-19) course.
Methods: An online database search (PubMed, Google Scholar, Scopus, Web of Science and Cochrane) was
performed between 13 March and 10 April 2020. The most relevant keywords were “D-dimer”, “SARS-CoV-2”,
“COVID-19”, “thrombosis” and “ARDS”. Selection was independently conducted by three reviewers. References
and previews of accepted articles were evaluated. Data inclusion/extraction inaccuracy was limited by the work
of three reviewers. Selection bias reduction was addressed by thoughtfully designing the search protocol. Quality
assessment was performed with the Newcastle–Ottawa Scale. The systematic review protocol was not registered
because we anticipated the very limited available evidence on the topic and due to the urgency of the study.
Results: 16 studies were evaluated. Good-quality criteria were reached in 13 out of 16 studies. D-dimer was
increased and significantly higher in COVID-19 patients compared with healthy controls, in COVID-19 patients
with severe disease or a composite end-point compared with non-severe disease, in ARDS compared with non-
ARDS patients and in deceased ARDS patients compared with ARDS patients who survived (all p<0.001).
COVID-19 patients treated with anticoagulants demonstrated lower mortality compared with those not treated
(p=0.017).
Conclusions: Correlations exist between COVID-19 infection, severe elevation of D-dimer levels, and increase in
the rate of complications and composite end-point. The appropriateness of early and continuous D-dimer
monitoring and labelled anticoagulation as management tools for COVID-19 disease deserves accurate
investigation, to prevent complications and reduce interventions
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
- …
