1,720,986 research outputs found
VATS bilaterale con sospensione sternale per timectomia radicale in paziente miastenica con neoformazione intraventricolare sinistra
No full textNei pazienti miastenici la chirurgia mininvasiva offre importanti benefici in termini di morbidità postoperatoria. Presentiamo un caso di un approccio VATS bilaterale con sospensione sternale per timectomia radicale in una paziente affetta da miastenia gravis e con una massa intraventricolare sinistra
Pulmonary metastasectomy : an overview
Full text linkMetastasectomy is the most frequent surgical resection undertaken by thoracic surgeons, being the lung the second common site of metastases. The present oncological criteria for pulmonary metastasectomy are: (I) the primary cancer need to be controlled or controllable; (II) no extrathoracic metastasis-that is not controlled or controllable-exists; (III) all of the tumor must be resectable, with adequate pulmonary reserve; (IV) there are no alternative medical treatment options with lower morbidity. General favourable prognostic features in patients with pulmonary metastases are: (I) one or few metastases; (II) long disease free interval; (III) normal CEA levels in colorectal cancers. Negative predictive features in patients candidate to pulmonary metastasectomies are: (I) active primary cancer; (II) extrathoracic metastases; (III) inability to obtain surgical radicality; (IV) mediastinal lymphatic spread. The lack of controlled trials and studies limited by short follow-up and small cohorts did not allow to overcome some skepticism; moreover, the heterogeneity of these patients in terms of demographic, biologic and histologic characteristics represents a clear limit even in the largest series. On the basis of present knowledge, without results coming from on-going randomized trials, radical resection, histology, and disease free interval seem to be independent prognostic factors identifying a cohort of patients maximally benefitting from lung metastasectomy
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
Extracellular vescicles and lung transplantation: new prospective in the evaluation of injury and function of the graft
No full textlung transplantation (LuTX) is a consolidated surgical therapy of end-stage pulmonary failure when maximal medical therapy fails. To assess the quality of the graft of the donor, chest x-ray, arterial gas analysis and smoking history are currently used, but often these factors do not allow a proper evaluation of the real cellular damage. In the donor, aspiration of gastric content, brain-death, or initial intensive care infections affect transplant outcome especially in the first 72 hours. Furthermore, ischemia-reperfusion lung injury (IRI) has a key role in the development of primary grafts dysfunction (PGD)
L’utilizzo del navigatore endobronchiale per la marcatura preoperatoria dei noduli polmonari non palpabili: un’esperienza preliminare monocentrica
No full textI recenti programmi di screening e il sempre maggior utilizzo della TAC ad alta definizione hanno reso sempre più diffuso il riscontro occasionale di noduli polmonari infracentimetrici o con caratteristiche densitometriche di GGO (ground glass opacity). Essendo le tecniche mininvasive di resezione chirurgica (VATS) il gold standard per procedere all'isotipizzazione di tali lesion, problema emergente è la difficoltà tecnica di localizzarle essendo spesso non palpabili per sede e densità
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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