1,720,959 research outputs found
Acute Care and Long-Term Results in Treatment of Tracheal Tumors: Monocentric Experience of the Last Seven Years
Get PDFTracheal tumors are rare neoplasms with extremely heterogeneous histological aspects and can be potentially life-threatening, due to airway obstruction. We report our results in medical, endoscopic and surgical treatment of primary and secondary tracheal tumors. From January 2008 to June 2015, on 35 patients treated for various tracheal diseases, we observed 6 patients (2 males, 4 females; median age: 50, 5 years, range: 2 months-72 years) with tracheal tumors: 5 primary (subglottic hemangioma, inflammatory pseudotumor, condromatous hamartoma, squamous cell carcinoma, acinic cell carcinoma), 1 secondary (pulmonary adenocarcinoma). Treatments were: medical in 1 case (subglottic hemangioma), endoscopic in 2 (squamous carcinoma; metastatic adenocarcinoma), surgical in 3 (inflammatory pseudotumor; condromatous hamartoma; acinic cell carcinoma). Post-treatment course was uneventful and with radical results in all patients. At a median follow-up of 42 months (range: 11-89 months) five of six patients are alive, in good conditions and without local or distant recurrence. Treatment of tracheal tumors may vary in relationship to clinical condition of patients, grade of tracheal obstruction, tumor extension, stage, histology and biological behavior, which are factors affecting prognosis and long-term survival. Endoscopic evaluation and histological diagnosis are mandatory to select the most adequate treatment; whenever possible, radical surgical resection should be performed
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
A rare case of necrotic thymoma
Get PDFThe Authors report the case of a patient who underwent resection of a huge anterior mediastinal mass, revealing to be a necrotic thymoma. The patient had been previously submitted to surgical biopsies of the mass yielding non-diagnostic results due to extensive necrosis. A sternotomy was then performed to resect the mediastinal mass originating from the thymus, en-bloc with the mediastinal fat and the apparently infiltrated lung. Histopathology showed a possible cyst/thymoma in massive necrosis, not further definable; revision by a specialized experienced pathologist (J. Rosai) confirmed total mass necrosis and no lung infiltration, thus orientating diagnosis towards a necrotic thymoma and excluding a lymphoblastic lymphoma, with similar histopathological features but more frequent in children or characterized by neoplastic infiltration of surrounding lung. Total body computed tomography (CT) scan and fluorodeoxyglucose positron emission tomography (18F-FDG-PET)/CT, show neither local recurrence, nor distant metastases two years after surgery. In case of anterior mediastinal mass with difficult histopathological diagnosis due to massive necrosis, the hypothesis of a necrotic thymoma should be considered. After radical removal prognosis is generally favourable and no adjuvant treatment is required
Surgical diseases and hiv status in patients at central hospital of Beira, Mozambique
Get PDFHIV-positive patients with surgical diseases are at a higher risk than HIV-negative patients of developing post-surgery complications. The goal of this study was to evaluate the main surgical diseases among HIV positive and HIV negative patients hospitalized in the surgical ward of the Hospital Central da Beira (HCB) in Mozambique. Were collected data before and after surgical procedures in all consecutive adult patients (> 18 years old) admitted and hospitalized at the Surgical Ward of the HCB from January to December 2017. Overall, a total of 237 adult patients were admitted to the surgical ward of Hospital Central of Beira, Mozambique. We reported all surgical information collected from patients. The most frequent surgical site for the operation was the abdomen (n.174; 73.4%), followed by perineum (n.42; 17.7%) and thorax (n.21; 8.8%). For health professionals working in surgery wards, data on the most frequent postoperative complications in HIV-positive patients will offer useful tools for the follow-up of those patients
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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