1,720,959 research outputs found
Un raro caso di osteomalacia ipofosforemica oncogenica associata ad iperparatiroidismo terziario
No full textPreoperative embolization of thyroid arteries in a patient with a large cervicomediastinal hyperfunctioning goiter
No full textWe present the case of a 61-year-old male patient with chronic obstructive pulmonary disease and a large cervicomediastinal multinodular hyperfunctioning goiter that made thyroidectomy a daunting task, especially considering the risk of intraoperative bleeding. The preoperative computed tomographic (CT) scan showed the right thyroid lobe very deeply rooted in the mediastinum, below the horizontal plane passing through the aortic arch. The thyroid mass imprinted the arterious and venous innominate trunks. To avoid a median sternotomy and remove the enlarged thyroid through a cervical approach alone, we decided to reduce the goiter in volume preoperatively by embolizing the thyroid arteries. We embolized the superior and inferior left, and the inferior right thyroid arteries. We spared the superior right thyroid artery because its blood supply contributed little to thyroid perfusion. After embolization, the patient was treated with antithyroid agents and corticosteroid drug therapy. At the same time, severe leukocytosis developed, thyroid hormone values increased, and a CT scan obtained 7 days after embolization showed the thyroid unchanged in volume. We therefore discharged the patient and were waiting for his laboratory blood chemical findings to return to normal. Thirty days later the patient was readmitted to hospital, and a new CT scan showed that the thyroid mass had diminished to half its initial volume. We could therefore perform a total thyroidectomy through a cervical approach alone. The only problem arose in dissecting tight right inferior laryngeal nerve adhesions to the thyroid capsule, probably sequelae of postembolization thyroiditis. Even though preoperative thyroid-artery embolization cannot be considered a routine technique in cervicomediastinal goiter surgery, in a rare patient who presents with a voluminous goiter such as the one we describe here, it is a useful procedure
Thyroid anaplastic tumor: our experience
No full textWe report our experience over the past 10 years in the treatment of thyroid anaplastic carcinoma analysing retrospectively 21 cases of surgical treatment (7 total thyroidectomies, 12 partial resection of the tumours and 2 biopsies). We consider the prognosis, which is invariably fatal, with no survival at 19 months and a mean survival of only 9 months, and assess the validity of a combined therapeutic approach (surgery + radiotherapy + chemotherapy) to increase survival and, above all, the patient's quality of life. The importance is stressed of through monitoring of risk factors consisting in concomitant or previous benign or malignant thyroid disease, considering total thyroidectomy to be necessary in principle for any variety of thyroid cancer. Lastly, we examine the survival trend in terms of residual disease and the presence or otherwise of remote metastases
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
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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