1,720,975 research outputs found
Inquadramento clinico del paziente vasculopatico
No full textLe patologie vascolari sono uno dei più rilevanti problemi per la sanità
nazionale e quindi rappresentano una importante branca della medicina.
I segni, le manifestazioni e le evoluzioni delle malattie vascolari vanno
spesso integrati con altre patologie capaci di influenzarne il percorso.
L’aumento della durata della vita, con il conseguente invecchiamento
della popolazione, rende il paziente vasculopatico una figura presente
costantemente negli ambulatori di medicina. I dati dell’Istituto Nazionale
di Statistica (ISTAT) riportano che in Italia l’età media della popolazione
è di 44,9 anni e che la fascia di popolazione con età superiore
a 65 anni è del 22,3%. Inoltre l’Italia è il Paese che presenta il tasso di
invecchiamento più intenso e veloce rispetto ad altre Nazioni come confermato
dell’Organizzazione Mondiale della Sanità (OMS) con una
aspettativa di vita al 2016 stimata in 80,6 anni negli uomini e 85 anni
nelle donne
Insufficienza Celiaco Mesenterica
No full textL’insufficienza celiaco-mesenterica (ICM) è una sindrome clinica in cui il sintomo cardine è rappresentato dal dolore addominale che insorge nella fase post-prandiale, e che è provocata dall’inadeguata vascolarizzazione di uno o più settori dell’apparato digerente. Essa insorge per la presenza di lesioni ostruttive a carico delle tre principali arterie splancniche: il tripode celiaco (TC), l’arteria mesenterica superiore (AMS) e quella inferiore (AMI). Esistono due forme di ICM, una acuta e una cronica, che differiscono dal punto di vista fisiopatologico, oltre che per eziologia e clinica, sottolineando peraltro la possibile evoluzione improvvisa da cronica in acuta, fino all’evoluzione in infarto intestinale più o meno esteso. Circa il 17,5% degli ultrasessantacinquenni presenta una patologia ostruttiva con interessamento significativo di almeno una delle tre arterie splancniche.1 Inoltre, studi autoptici hanno dimostrato che la prevalenza della malattia aterosclerotica a carico delle arterie mesenteriche si attesta attorno al 6-10%, con l’occlusione completa di almeno uno dei tre vasi nel 3% dei soggetti.2
Grazie alla notevole collateralità fisiologicamente presente sia all’interno del circolo splancnico, che tra questo e i distretti adiacenti, la maggior parte dei soggetti affetti da malattia occlusiva mesenterica rimane asintomatica, così che l’incidenza precisa della ICM cronica rimane sconosciuta: negli USA, essa è responsabile di poco meno di 1 ricovero ogni 100,000,3 mentre la forma acuta risulta relativamente più frequente, quasi 1 ricovero ogni 1000.4 Per entrambe le forme, l’incidenza è tre volte superiore nel sesso femminile rispetto al maschile
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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