1,720,971 research outputs found
Is it safe and effective to perform repeated hepatectomies in a small-volume center ?
No full textBackground
Repeated hepatectomies for colorectal liver metastases (CLM) are considered safe but are mostly carried out in highly specialized hepato-biliary units. Aim of this study was to review the outcomes of re-hepatectomies in the setting of a general surgery Division and to compare them with the data included in Livermetsurvey.
Patients and Methods
We made a retrospective analysis of all comers who underwent liver resection for CLM between January 2002 and December 2011 in our General Surgery Department. Postoperative outcome was analyzed and compared with a control group of single hepatectomies. Three-year survival rates were calculated by Kaplan-Mayer method. The differences in morbidity and mortality between the single-only and the repeated hepatectomies cohort were exhibited through the chi-square test. Our data were compared with the Livermetsurvey Registry.
Results
74 patients underwent 101 hepatectomies for CLM. 20(27%) patients received 27 repeated hepatectomies for recurrent metastases, 17 had a second hepatectomy, 2 underwent a third hepatectomy and 1 had a fourth procedure. Postoperative mortality was 1,3% after first hepatectomies and nihil after repeated resections. No difference in terms of mortality was observed between first and second hepatectomies (p=0.79). Postoperative morbidity after the first hepatectomy was 16%, while with repeated resections reached 30%.(p=0.3) The three-year overall survivals after the first and the repeated hepatectomies were respectively 61% and 39%, similar to the data reported by the Livermetsurvey Registry (61% and 58%).
Conclusion
Repeated hepatectomies for colorectal liver metastases may be performed safely in a relatively low-volume center with good outcomes. The survival rates are equivalent to those reported by Livermetsurvey
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
DOES POSTOPERATIVE SERUM LIPASE PREDICT PANCREATIC FISTULA AFTER PANCREATICODUODENECTOMY?
No full textIntroduction
Pancreatic fistula (POPF) is the most important cause of morbidity and mortality after pancreaticoduodenectomy (PD). Few data are available to stratify the postoperative risk of developing this complication. The aim of this study was to evaluate the role of serum lipase concentration on postoperative day 1 (POD1) as a predictive factor of the development of pancreatic fistula (PF).
Materials and methods
We retrospectively analyzed data from 89 consecutive PD between January 2009 and December 2013 in order to analyze the association between serum lipase concentration on POD1 and the development of PF .
Results
27 patients (30%) developed POPF (Grade A 16 (18%), Grade B 8 (9%), Grade C 3 (3%). Serum lipase were strongly associated with developing of the PF (p44,5 IU/l was 90% and 65%, respectively. Positive and negative predictive values were 29% and 98 %, respectively.
Conclusion
Serum lipase concentration on POD1 may be used, in addition to other prognostic factors, to help stratify risk for developing PF following PD. Serum lipase POD1 ≥44,5 IU/l allows for the early and accurate categorization of patients at low risk for clinically significant POPF and may identify patients suitable for post-operative fast track program with significant clinical and economic benefits
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
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