1,721,321 research outputs found
Trattamento dell’aorta toraco-addominale: cosa ci dicono le nuove linee guida europee e cosa ci ha insegnato l’esperienza
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Utilisation de la technique cheminée après couverture accidentelle de l’artère carotide commune gauche lors de la pose d’une endoprothèse aortique=use of chimney graft after accidental coverage of the left common carotid artery in TEVAR procedure
No full textThoracic endovascular aneurysm repair (TEVAR) is currently the therapy of first choice for most thoracic aortic disease. Because aortic stent grafts are placed in the vicinity of aortic side branches, unintentional coverage of these arteries may occur.Prérequis : Le traitement endovasculaire est actuellement le traitement de choix dans le
traitement des pathologies de l’aorte thoracique. Les endoprothèses aortiques sont placées à
proximité des artères des troncs supra‐aortiques et une couverture accidentelle de ses artères
peut se produire.
Observation : Nous rapportons le cas d’un homme âgé de 69 ans présentant un ulcère
pénétrant de la crosse aortique asymptomatique, à proximité de l’origine de l’artère sous
clavière gauche. En raison des antécédents médicaux, nous décidons de réaliser un traitement
endovasculaire avec mise en place d’une endoprothèse au niveau de l’hémi crosse aortique
gauche, après avoir réalisé un pontage carotido‐sous clavier. Lors du déploiement, le segment
proximal de l’endoprothèse aortique couvre accidentellement l’origine de la carotide commune
gauche. Comme procédure de sauvetage, nous avons réaliser avec succès la revascularisation de
l’artère carotide commune gauche en utilisant la technique cheminée.
Conclusion : Le traitement endovasculaire des pathologies aortiques a connu un regain de
popularité lors de la dernière décennie. Malgré les évolutions réalisées, cette procédure reste
un challenge technique. La couverture accidentelle d’une branche principale de la crosse
aortique durant les procédures endovasculaire est une complication sérieuse nécessitant une
intervention immédiate. La technique cheminée est une solution peu invasive dans ce genre
d’accident, avec des résultats promettant
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
Gli aneurismi infiammatori dell'aorta sottorenale : aspetti istopatologici, diagnostici e terapeutici
No full textInflammatory abdominal aneurysms (AIAA) represent a clearly defined clinical entity with an incidence ranging between 1.2% and 15%. In spite of the increasing number of observations reported in recent years, the etiopatholgenesis and natural history have not been defined. The lesion can present in an acute, subacute or chronic manner and the histopathological studies reveal prevalently two components: an inflammatory infiltrate and a diffuse fibrosis, in varying degree. This study aimed to analyze the more recent imaging procedures in order to correctly diagnose this lesion. In our experience the incidence of AIAA is about 2.5%. On the basis of macro microscopic pictures the authors divided patients into two groups: one constituted by the acute or subacute inflammatory forms, the other by chronic clear inflammatory aneurysms. All patients underwent on operative treatment. The surgical adopted techniques and the obtained results are reported
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
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