1,721,061 research outputs found
Minimally invasive liver resection: has the time come to consider robotics a valid assistance?
No full textMinimally invasive liver resection (MILR) has been steadily increasing worldwide. Since its introduction in the early 1990s, initially adopted in cases of wedge and minor anatomical resection for benign hepatic lesions, MILR has been extended to major liver resection and for malignant hepatic lesions (1). Laparoscopic lateral sectionectomy has progressively become a standard operatio
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
A systematic review and meta-analysis of spleen-preserving distal pancreatectomy with preservation or ligation of the splenic artery and vein
No full textIntroduction: Spleen-preserving distal pancreatectomy (SPDP) can be performed either by ligating (SPDP-VL) or preserving (SPDP-VP) the splenic vessels. Methods: A systematic review was performed, and standard PRISMA guidelines were followed. A literature search was conducted using Medline, PubMed and the Cochrane Central Register of Controlled Trials between January 1988 and May 2014. The article titles and abstracts were examined by two independent reviewers. Results: Thirteen non-randomized control trials were included in the meta-analysis. The pooled data included 667 patients who underwent SPDP. There were 209 patients in the SPDP-VL group and 458 patients in the SPDP-VP group. The risk of splenic infarction was significantly higher in the SPDP-VL group [20.88 vs. 2.09%; OR 11.89 (95% CI 4.33 to 32.70); p < 0.00001]. The rate of splenectomy as a result of splenic infarction was also statistically associated with SPDP-VL [7.69% vs. 1.36%; OR 3.87 (95% CI 1.05 to 14.26); p = 0.05)]. The surgical operative time was shorter in the SPDP-VL group than in the SPDP-VP group (mean difference 21.2 min), but this result was not statistically significant (95% CI -47.01 to -4.48; p = 0.11). The two procedures were comparable with respect to mean intraoperative blood loss and rate of pancreatic fistula. SPDP-VL did not influence the risk of developing perigastric collateral vessels and submucosal varices. Conclusions: SPDP-VL may result in a higher rate of splenic infarction and splenectomy than SPDP-VP. However, the low quality of the included studies does not lead to clear conclusions
Treatment of median incisional hernia. Laparoscopic vs. open surgery: meta-analysis
No full textIn the last ten years we assisted to spreading of laparoscopic approach on the correction of median incisional hernia, although for increased interesting toward mini-invasive techniques than for matching results between lap and open approaches. The aim of our study is the critical analysis of the results of lap and open surgery in the approach of ventral hernia, through the meta-analytical revision of the principal checked prospective trials. There were emerged 7 perspective studies to fit to a meta-analysis with the revision of the literature, with 1165 patients in total. Among the perioperative outcomes the briefer surgical time and a reduction of postoperative hospitalization were observed with the significant statistic data in favor of the lap. Laparoscopy can be considered a valid technical alternative to traditional open surgery in the treatment of ventral incisional hernia. The advantages of mini-invasive approach are the reducing of the surgical time and of the total hospital stay. There were not emerged any significant differences regarding the other surgical end-points or the recurrences of hernias after 1 and 5 years
Association Between Cross-Stapling Technique in Mechanical Colorectal Anastomosis and Short-term Outcomes
No full textBACKGROUND:The double-stapled technique is the most common method of colorectal anastomosis in minimally invasive surgery. Several modifications to the conventional technique have been described to reduce the intersection between the stapled lines, as the resulting lateral dog-ears are considered possible risk factors for anastomotic leakage.OBJECTIVE:This study aimed to analyze the outcomes of patients receiving conventional versus modified stapled colorectal anastomosis after minimally invasive surgery.DATA SOURCES:A systematic review of the published literature was undertaken. PubMed/MEDLINE, Web of Science, and Embase databases were screened up to July 2023.STUDY SELECTION:Relevant articles were searched according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. Articles reporting on the outcomes of patients with modified stapled colorectal reconstruction compared with the conventional method of double-stapled anastomosis were included.INTERVENTIONS:Conventional double-stapling colorectal anastomosis and modified techniques with reduced intersection between the stapled lines were compared.MAIN OUTCOME MEASURES:The rate of anastomotic leak was the primary end point of interest. Perioperative details including postoperative morbidity were also appraised.RESULTS:There were 2537 patients from 12 studies included for data extraction, with no significant differences in age, BMI, or proportion of high ASA score between patients who had conventional versus modified techniques of reconstructions. The risk of anastomotic leak was 62% lower for the modified procedure than for the conventional procedure (OR = 0.38 [95% CI, 0.26-0.56]). The incidences of overall postoperative morbidity (OR = 0.57 [95% CI, 0.45-0.73]) and major morbidity (OR = 0.48 [95% CI, 0.32-0.72]) following modified stapled anastomosis were significantly lower than following conventional double-stapled anastomosis.LIMITATIONS:The retrospective nature of most included studies is a main limitation, essentially because of the lack of randomization and the risk of selection and detection bias.CONCLUSIONS:The available evidence supports the modification of the conventional double-stapled technique with the elimination of 1 of both dog-ears as it is associated with a lower incidence of anastomotic-related morbidity
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
- …
