1,720,957 research outputs found
Safety and feasibility of laparoscopic liver resection with associated lymphadenectomy for intrahepatic cholangiocarcinoma: a propensity score-based case-matched analysis from a single institution
No full textIntrahepatic cholangiocarcinoma (ICC) is still a relatively uncommon indication for laparoscopic surgery because of technical challenges related to the frequent need for major hepatectomies and the necessity to perform formal regional lymphadenectomy. The aim of the present case-matched study was to compare laparoscopic and open resections for ICC. In a case-matched retrospective analysis, 20 consecutive patients who had undergone laparoscopic resection for ICC (LPS group) were compared with 60 of 83 patients who had undergone open surgery (open group) in the same institution. The groups were matched in a ratio of 1:3 using propensity scores based on covariates representing relevant patient characteristics and severity of disease. The main endpoints were short- and long-term outcomes and impact and adequacy of laparoscopic lymphadenectomy. The groups were well matched in terms of patient and disease characteristics. The laparoscopic approach resulted in less blood loss (200 vs. 350 mL, p = 0.040) despite less extensive use of the Pringle maneuver. There was no difference in perioperative morbidity and mortality rates; however, the laparoscopic approach was associated with faster functional recovery (median 3 vs. 4 days, p = 0.050). After a mean follow-up of 39 months, disease-free and overall survivals were 33 and 51 months, respectively, for the LPS and 36 and 63, respectively, for the open group (p ns). The number of harvested nodes was comparable between groups. Compared with open surgery, laparoscopic resection of ICC is feasible and safe, providing short-term benefits without negatively affecting oncologic adequacy in terms of rate of R0 resections, depth of margins, and long-term overall and disease-free survivals. Laparoscopic regional lymphadenectomy is technically possible but should be the object of future focused studies
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
Laparoscopic major hepatectomies: current trends and indications. A comparison with the open technique
No full textDiffusion of laparoscopic major hepatectomies is experiencing a steady increasing trend, although slower compared to minor resections. The aim of this single-center study is to discuss current trends and indications in the application of minimally invasive techniques to major hepatic resections. Preoperative patients and disease characteristics of 49 laparoscopic major hepatectomies (LPS group), performed between 2005 and 2015, were compared with 585 open hepatectomies (Open group) to analyze differences in patients recruitment. Factors which were found to be differently distributed between groups were used as covariates in a propensity score-based case-matched analysis with a 1:3 ratio between LPS group and 147 patients from the Open group (constituting Open-mat group). Short-term outcome was analyzed in matched groups. ASA score, previous abdominal surgery, previous interventional procedures, indication, lesion size and associated procedures were significantly different between the LPS and the Open group. Short-term outcome analysis revealed that blood loss (200 vs 350 mL, p = 0.044) and time for functional recovery (3 vs 4 days, p = 0.05) were reduced in the LPS compared to the Open-mat group, in spite of longer length of surgery (260 vs 170 min, p = 0.041) and comparable oncological adequacy. Even though data on technical feasibility of laparoscopic major resections and their benefits in terms of blood loss and functional recovery support the diffusion of minimally invasive approach, the limit of the technique is still represented by the reduced pool of suitable candidates
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
A prognostic score to predict major complications after pancreaticoduodenectomy
No full text"OBJECTIVE:. . To develop and validate a simple prognostic score to predict major postoperative complications after pancreaticoduodenectomy (PD).. BACKGROUND:. . PD still carries a high rate of severe postoperative complications. No specific score is currently available to stratify the patient's risk of major morbidity.. METHODS:. . Between 2002 and 2010, preoperative, intraoperative, and outcome data from 700 consecutive patients undergoing PD in our institution were prospectively collected in an electronic database. Major complications were defined as levels III to V of Clavien-Dindo classification. On the basis of a multivariate regression model, the score was developed using a random two-thirds of the population (n = 469) and was validated on the remaining 231 patients.. RESULTS:. . Major complication rate was 16.7% (117/700). Significant predictors included in the scoring system were: pancreas texture, pancreatic duct diameter, operative blood loss, and ASA score. The mean risk of developing major postoperative complications was 7% in patients with score 0 to 3, 13% in patients with score 4 to 7, 23% in patients with score 8 to 11, and 36% in patients with score 12 to 15. In the validation population, the predicted risk of major complications was 15.2% versus a 16.9% observed risk (C-statistic index = 0.743).. CONCLUSION:. . This new score may accurately predict a patient's postoperative outcome. Early identification of high-risk patients could help the surgeon to adopt intraoperative and postoperative strategies tailored on individual basis
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
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