1,720,957 research outputs found
Surgical treatment of reflux stricture of the oesophagus.
No full textThe choice of surgery in patients with reflux-induced oesophageal stricture
remains controversial. From 1976 to 1990, a total of 65 patients underwent
fundoplication (36 patients), Collis gastroplasty plus fundoplication (ten),
total duodenal diversion (four) and oesophageal resection (15). The postoperative
mortality rate was 5 per cent (three patients): necrosis of the colon transplant
in two patients and acute pancreatitis in one. The median follow-up was 25 (range
6-120) months. After conservative surgery, the median number of dilatations per
patient per year significantly decreased (P < 0.001). Nine patients (25 per cent)
complained of persistent or recurrent symptoms after standard fundoplication and
six required reoperation. Clinical results were satisfactory in patients who
underwent Collis fundoplication, total duodenal diversion and oesophageal
resection. It is concluded that the causes of failed fundoplication are
irreversible stricture or persistent gastro-oesophageal reflux; the latter may be
caused by inefficacy or deterioration of the partial fundoplication wrap. A
subtle degree of oesophageal shortening is probably underestimated in such
patients and this may explain the better results obtained with the Collis
fundoplication. Total duodenal diversion is a good therapeutic option in patients
who have undergone previous oesophagogastric surgery. Oesophageal resection
should be reserved for patients with tight strictures unresponsive to dilatation
or those with scleroderma, multiple previous operations or severe dysplasia in
Barrett's oesophagus
DILATATION OF REFLUX-INDUCED ESOPHAGEAL STRICTURES: EARLY AND LONG-TERM RESULTS IN 106 PATIENTS
No full text
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
REFLUX-INDUCED ESOPHAGEAL STRICTURES: FACTORS INFLUENCING LONG-TERM RESULTS OF DILATION
No full textI.F.=0.80
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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