1,720,955 research outputs found
Giant mid-esophageal diverticulum. Conservative treatment of postoperative leakage.
No full textMid-esophageal diverticula are rare entities. Only symptomatic patients usually receive surgical treatment. Esophageal leakage is one of the most common complications after these procedures. Though in literature, operative management is the preferred treatment for esophageal fistula, conservative approach is described in case of small leaks. We report a case of an operated giant mid-esophageal diverticulum complicated with an esophageal fistula. The patient underwent a surgical treatment and recovered completely.Mid-esophageal diverticula are rare entities. Only symptomatic patients usually receive surgical treatment. Esophageal leakage is one of the most common complications after these procedures. Though in literature, operative management is the preferred treatment for esophageal fistula, conservative approach is described in case of small leaks. We report a case of an operated giant mid-esophageal diverticulum complicated with an esophageal fistula. The patient underwent a surgical treatment and recovered completely
Esplorazione e validazione di modelli di regressione logistica nell’ambiente statistico R orientati all’individuazione di potenziali predittori indipendenti per l’insorgenza di complicanze polmonari maggiori nel trapianto di fegato.
No full textIntroduzione - La regressione di Cox di rischio proporzionale (RCRP) ipotizza che i coefficienti del modello non dipendano dal tempo t. Tale ipotesi dovrebbe essere sistematicamente verificata prima di dichiarare la validità di un modello. Nel presente studio si è proceduto alla esplorazione/validazione di modelli di RCRP orientati all’individuazione di potenziali predittori indipendenti di esito nel trapianto di doppio rene (DKT).
Pazienti e Metodi - In base al grado di completezza dei record dei donatori, sono stati arruolati nello studio 59 pazienti sottoposti a DKT presso il Centro Trapianti di Genova nel periodo 21/04/1999 – 21/09/2008. Le sopravvivenze di riceventi (RS) e graft (GS) sono state assunte come variabili di esito per i modelli di RCRP. Questi ultimi sono stati testati in modalità univariata, introducendo nelle successive esplorazioni multivariate le sole variabili con P <0.05. I modelli di RCRP sono stati analizzati/validati mediante ANOVA, calcolo dei residui (CR) ed il test di rischio proporzionale (TRP) utilizzando l’ambiente statistico R (versioni 2.8.1/2.9.0).
Risultati - Le RS e GS generali sono risultate nell’ordine del 93.22% e dell’86.44%, rispettivamente. I modelli univariati per RS sono risultati significativi per la creatinina (Cr) dei donatori (P = 0.0077), la clearance della Cr dei donatori (P = 0.023) e l’età dei riceventi (P = 0.047). I modelli univariati di RCRP per GS hanno riscontrato una significatività per la Cr dei donatori (P = 0.027) e la Cr dei riceventi misurata al 3° mese (P = 0.043) ed al 6° mese post-trapianto (Cr_6month_PTx) (P = 0.017). Nel successivo modello multivariato per RS non è stata ottenuta alcuna significatività, mentre nel modello multivariato per GS la Cr_6month_PTx è risultata ancora significativa (P = 0.034; exp = 7.24). I test di validazione hanno evidenziato come il modello ristretto alla sola variabile Cr_6month_PTx possa descrivere efficacemente la GS. Un ulteriore modello per GS stratificato sulla media della Cr_6month_PTx (1.5 mg/dl) ha confermato la significatività di tale variabile (P = 0.040; exp = 5.65).
Conclusioni - L’esplorazione/validazione di modelli di RCRP ha individuato nella Cr_6month_PTx un potenziale predittore indipendente per GS in una popolazione di pazienti sottoposti a DKT
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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