1,720,959 research outputs found
L'algoritmo decisionale nelle neoplasie estese dell'ipofaringe ed esofgo cervicale.
No full textAbstract: Hypopharynx reconstruction must deal with restoration of not a simple tubed conduit but a complex arrangement of constrictive and propulsive forces with fine sensory circuits. The chosen surgical approach should guarantee both complete removal of tumor and re-establishement of the two primary functions of the district: first swallowing and then phonation. We retrospectively reviewed data of 67 patients who had undergone oncologic reconstruction of hypopharynx with either pedicled or free flaps at the ENT Department of IRCCS Policlinico S Matteo, University of Pavia, between November 1994 and July 2004. Type and extension of the defect following cancer removal guided the selection of reconstructive procedure. Partial defects, with more than 50% mucosa spared, in absence of chance of being closed primarly, were covered with radial forearm free flaps as first choice; pedicled flaps such as pectoralis major and SCM rotational flaps were used instead if free flaps contraindicated by general and/or local conditions. With circumferential defects reconstruction was accomplished by means of jejunum free flap, as first choice. Adverse local abdominal conditions mandated the alternative use of either tubulized or tunnelized fasciocutaneous free flaps, such as radial forearm and lateral thigh. When free flaps use contraindicated, or in case of salvage surgery after flap loss, pectoralis major and latissimus dorsi pedicled flap were chosen. Both reconstructions with free and pedicled flaps were successful in an high percentage of cases (>85%). Analysis of incidence and causes of flap failure are reported in this work. In the free flaps group of patients a lower rate of complications were registered, allowing a faster patient discharge from hospital (36% versus 81.3%). An oral swallowing function was gained in 92% of free flaps and 62.5% of pedicled flaps. Excellent and exclusive oral nutrition (free diet), was obtained in 54% of free flaps and 25% of pedicled flaps. None of patients undergone laryngectomy coupled in both groups with pharyngectomy achieved an intelligible esophageal speech. Only patients in the free flaps group benefitted from voice prosthesis implant: in fact this procedure was avoided in pedicled flaps due to the excessive tissue bulk. In conclusion, the data collected suggest that free flaps rapresent the first choice for both partial and total oncologic hypopharyngeal reconstruction, while pedicled flaps should be taken into account when free ones contraindicate
Sternocleidomastoid muscle flap in esophageal perforation repair after cervical spine surgery: concepts, techniques, and personale experience.
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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
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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