1,720,967 research outputs found
A Case of Recurrent Secondary Aortoenteric Fistula 4 Months after Surgery Treated by Endovascular Coiling of the Aortic Stump and Bilateral Chimney Stent Grafts to Renal Arteries
No full textThe treatment of recurrent aortoenteric fistula (AEF) previously repaired by surgery is challenging, with a high mortality rate. Open repair is often limited by “hostile abdomen,” while endovascular treatment is difficult when the distance between the aortic stump and the origin of the renal arteries is short, with high risk of their occlusion. We describe a recurrent AEF repaired by surgery 4 months earlier, treated by endovascular coiling of the aortic stump after deployment of 2 renal artery stent grafts with the chimney technique
Management of radial artery pseudoaneurysm in radial forearm free flap: case report and review of the literature
No full textThe formation of a pseudoaneurysm in a revascularized free flap is an extremely rare complication in microsurgery. The most effective treatment modality is still the subject of debate. We present the management of a case of pseudoaneurysm of the arterial pedicle of a radial free flap used after hemiglossopelvectomy in a patient with squamous cell carcinoma of the tongue. In our case, a 74-year-old man with the pseudoaneurism was successfully treated by endovascular stenting. Endovascular stenting can be considered an effective and safe procedure and a relevant alternative to open neck surgical treatment
Spyglass percutaneous transhepatic lithotripsy of symptomatic recurrent lithiasis of the intrahepatic bile duct with distal stenosis
No full textIn patients with symptomatic intrahepatic biliary lithiasis, the treatment is usually discussed by a multidisciplinary team. Although hepatectomy is considered as definitive treatment, when lobar atrophy is absent, endoscopic procedures are frequently proposed as first-line treatment due the low invasiveness and for sparing liver parenchyma. Percutaneous route is used in case of peroral approach failure. We present a case of recurrent symptomatic intrahepatic biliary lithiasis of the right posterior hepatic duct, sustained by downstream biliary stenosis. Peroral cholangioscopy failed to visualize the stone for the accompanying stenosis. Thus, the patient was successfully treated with percutaneous transhepatic lithotripsy performed with Spyglass direct visualization system II (Boston Scientific Inc., Natick, Massachusetts, USA). During the procedure, the biopsy of the biliary stenosis revealed fibrosis, which was treated by cholangioplasty with cutting balloon. After 15 months, the patient is asymptomatic, with moderate residual stenosis in absence of calculi at follow-up magnetic resonance cholangiography
COVID-19 outbreak in Italy: Clinical-radiological presentation and outcome in three oncologic patients
No full textWe present three patients affected by pulmonary squamous cell carcinoma, metastatic esophageal cancer and advanced non-Hodgkin lymphoma, who incurred in coronavirus 2019 (COVID-19) infection during the early phase of epidemic wave in Italy. All patients presented with fever. Social contact with subject positive for COVID-19 was declared in only one of the three cases. In all cases, laboratory findings showed lymphopenia and elevated C-reactive protein (CRP). Chest x-ray and computed tomography showed bilateral ground-glass opacities, shadowing, interstitial abnormalities, and “crazy paving” pattern which evolved with superimposition of consolidations in one patient. All patients received antiviral therapy based on ritonavir and lopinavir, associated with hydroxychloroquine. Despite treatment, two patients with advanced cancers died after 39 and 17 days of hospitalization, while the patient with lung cancer was dismissed at home, in good conditions
Predictors of the multiwire technique use in carotid artery stenting
No full textObjectives: The multiwire technique (MWT) in carotid artery stenting (CAS), characterized by the use of more than one guidewire to support guiding catheter in patients with hostile neck anatomy, increases procedural time, enhancing the risk of periprocedural stroke. The aim of the present study was to identify which factors are predictors of the MWT use in CAS, in order to stratify patients with longer procedure at potential higher risk of periprocedural stroke.Methods: The study retrospectively included patients who underwent CAS for stenotic plaque between January 2015 and December 2019. Exclusion criteria was incomplete clinical data. For each patients were registered clinical data, main aortic arch and supra-aortic vessel anatomical features, carotid plaque characteristics, and procedural details. The sample was divided in two group on the basis of the number of guides used during the stenting procedure: one guide (standard technique, ST) or more than one guidewire (MWT) to support the guiding catheter. Differences between groups were tested by Chi-square text or Fisher's exact test and Mann-Whitney U test. Logistic regression analysis was used to identify predictors for the use of the MWT. The area under the ROC (AUC) curve was used to assess performance of the model to predict the use of the multiwire technique.Results: The final sample included 146 of the 204 (71%) patients who underwent CAS during the study period. The median age of the patients was 79 years (IQR 71-83 years) with 47/146 (32%) females. CAS was performed with MWT in 17/146 (12%) of the cases. MWT was used more likely in patients with aortic arch type II or III as compared to ST (71% vs 37%, P = 0.02) while plaques with heavy concentric calcifications were more frequent in ST as compared to MWT (38% vs 12%, P = 0.03). At multivariable analysis aortic arch type II or III (OR 5.08, 95% CI 1.48-17.93, P < 0.01), plaque stenosis > 79% (OR 4.13, 95% CI 1.03-16.61, P = 0.04), and plaque heavy concentric calcifications (OR 0.19, 95% CI 0.04-0.94, P = 0.04) were independent predictors of MWT use. The model showed an AUC of 0.827 (95% CI 0.756-0.884) for the prediction of the MWT use during CAS.Conclusions: Aortic arch type II or III, carotid plaque with stenosis higher than 79% of the lumen or without heavy concentric calcifications were predictors for the use of the MWT during CAS. These features should be considered during planning of CAS as hallmark of vascular stiffness and therefore of higher procedure complexity
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
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
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