1,354,242 research outputs found
The learning curve of laparoscopic ablation of liver tumors: A technically demanding procedure requiring dedicated training
No full textBackground: Laparoscopic ablation (LA) of liver tumors is an increasingly performed procedure. However, LA is technically demanding, with inherent difficulties making LA more complex than percutaneous and open surgery ablations. This study aimed to characterize the learning curve (LC) of LAs. Methods: All consecutive LAs of malignant liver tumors performed with curative intent by a single surgeon were identified from a prospective database. A risk-adjusted cumulative summative (RA-CUSUM) analysis was used for evaluating the LC of LAs. Incomplete ablation (IA) was the outcomes measure. Performance trends were analyzed using broken-line modeling. Results: From June 2007 to February 2018, 241 lesions underwent LA during 151 procedures. RA-CUSUM analysis demonstrated an LC of 93 LAs (p < 0.001), with an IA rate decreasing from 12.9% to 4.7% (p = 0.027). Lesions in the posterosuperior segment and those in cirrhotic livers showed an LC of 34 and 45 tumor ablations, respectively (p=<0.001 each). Open ablations performed during the same period showed steady outcomes, indicating already acquired proficiency. Conclusion: Completion of a steep LC is needed to gain proficiency in LAs. Dedicated training should be warranted to novices to smooth the LC and decrease LA failures
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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 vs robotic minor liver resection of lesions located in the postero-superior segments: A comparative analysis
No full textIntroduction: Laparoscopic liver resection (LLR) is
worldwide accepted as safe treatment option for anterior lesions of the liver. The approach of lesions located
in the postero-superior (PS) segments (I-IVa-VII-VIII)
is more difficult and usually associated to a higher conversion rate and intraoperative complications. It has
been speculated that robotic assistance can facilitate
the approach to these segments.
Method: From 2005 to 2013, 122 minor liver resection
were performed in PS segments: 91 of whom with pure
laparoscopic approach (LAP-Group) and 31 with
robotic assistance (ROB-Group). We analyzed retrospectively data coming from a prospective kept database looking to pre-intra and postoperative parameters
in both groups.
Results: No perioperative mortality was recorded.
Mean age was of 58.6 15.6 vs. 63.7 12.7 years,
respectively (p = 0.12), male rate was 54.9% vs. 61.3%
(p = 0.68). Contemporaneous colic resection was performed in 4.4 vs. 22.6% (p = 0.006). Type of resection
were: bisegmentectomy in 19% and 16%; monosegmentectomy 24% and 16%; wedge 37% and 42%; mixed
20% and 26%, respectively for Lap and ROB (p = 0.8).
Previous liver resection were 11% vs. 7.4% (p = 0.73),
mean surgical time 286 103 vs. 301 135 minutes
(p = 0.54), blood loss 292 404 vs. 380 381 cc (p = 0.35) respectively. Pringle maneuver was 13.2% vs.
58.1% respectively for LAP and ROB (p < 0.01). Conversion rate was 11% vs. 16.1% (0.53). Histology
revealed that the mean nodules number was of
1.6 0.9 vs. 1.9 1.3 (p = 0.2), total lesions dimension was of 44.4 28.2 vs. 42.9 31.1 mm (p = 0.8)
and R1 margins 15% vs. 11% (p = 0.55). Overall complication rate was of 18.2 vs. 14.8% (p = 0.6), mean
hospital stay 5.6 4.1 vs. 8.6 8 days (p = 0.01).
Conclusions: Pure laparoscopic and robotic liver resections for lesions located in PS segments have a similar
outcome and conversion rate. A trend for higher blood
losses could be related to differences in operative techniques and resection devices (surgical aspirator in LAP
vs. crush clamping technique in ROB)
Variations on the Author
No full text“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
No full textWe 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
No full textWe 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
Author, publisher and bookseller : a tripartite synergy in Nigerian book industry
No full textThis work is about the roles of Author, Publisher and Bookseller in Book development in
Nigeria. The paper started by delving into the history of Book Publishing in Nigeria after
which it proceeded by defining who an author, a publisher, and a bookseller is and
expatiated on the indispensable roles of these key actors in Nigerian Book Industry and in
the emerging Information Society. Furthermore, the various constraints to book
development were identified while the paper advised on how the Book Industry can be
further promoted in Nigeria. However, the paper concluded and made recommendations
on how the Book sector can help in enhancing scholarship in the country
The Thursday Murder Club: Launching a megabrand author - a publishing case study
No full textIn 2020, the Christmas book charts in the UK made headlines: Barack Obama’s eagerly awaited autobiography, The Promised Land, was beaten to the top spot by The Thursday Murder Club by Richard Osman, a debut cosy crime novel set in a retirement village. Not only did Osman’s book beat the former US president’s expected bestseller, it also broke records, becoming the fastest-selling debut crime novel of all time. Although Osman has a certain level of fame in the UK from his TV appearances on shows such as Pointless, his celebrity status does not entirely explain the novel’s huge sales. This article tracks the acquisition, publication, and promotion journey of The Thursday Murder Club in order to understand the industry and cultural context of its success and to interrogate the role of celebrity in the creation of author brands. The findings suggest that the unexpected scale of the success of the book owed to a number of factors, including in-depth editing by the novel’s agent, editor, and author to tighten up the plot, an extensive and strategic promotional campaign, the pandemic (which drove interest in the book’s genre and themes), and the quality of the writing. We find that the book’s success was accentuated by Osman’s celebrity status rather than being entirely reliant on it. This research adds to the growing scholarship on celebrity authorship by means of an in-depth case study and provides insight into the processes behind publishing a ‘celebrity’ book and launching a megabrand author
Laparoscopic Liver Surgery Training Course on Thiel-Embalmed Human Cadavers: Program Evaluation, Trainer’s Long-Term Feedback and Steps Forward
No full textObjectives: The purpose of this study was to evaluate the feedback of participants upon laparoscopic liver surgery (LLS) course on Thiel-embalmed human bodies. Methods: From 2010 to 2017, ten LLS masterclasses have been organized by the Department of Hepatobiliary Surgery at Ghent University Hospital. A 23-question anonymous survey was electronically sent to 119 participants between November 2017 and January 2018, exploring their characteristics and asking for evaluation of the course. The obstacles for implementing LLS in their centers have been assessed. Results: Sixty-four surgeons (53.8%) responded to the survey; 42 (65.6%) were employed at a university hospital; and 39 (60.9%) were in the first decade of their practice as a consultant surgeon. Forty-three (67.2%) surgeons reported an increased percentage of LLS cases afterward. Training on Thiel cadavers was considered superior (49.2%) to other training options including proctoring in the operating room (34.9%), virtual reality (6.3%), video training (4.8%) and practicing on pigs (4.8%). Obstacles identified contained inadequate training, patient’s referral pattern, financial issues, lack of dedicated surgical team and time constrains. Conclusions: This survey revealed that a structured short-time program incorporating interactive discussion, live operations and hands-on training on human bodies under proctorship may enhance efficient training in laparoscopic liver surgery. In a step forward for upcoming courses, the importance of team building has to be addressed
Laparoscopic Versus Open Thermal Ablation of Colorectal Liver Metastases: A Propensity Score-Based Analysis of Local Control of the Ablated Tumors
No full textBackground: Laparoscopic ablation (LA) of colorectal liver metastases (CRLMs) is frequently performed in combination with laparoscopic liver resection or as a stand-alone procedure. However, LA is technically demanding and whether the results are comparable with those of open ablation (OA) has not been determined to date. This study compared the effectiveness of LA and OA in achieving local tumor control of CRLMs. Methods: Patients undergoing LA or OA of CRLMs at Ghent University Hospital between June 2007 and February 2018 were identified from a prospective database. Lesions treated by LA and OA were matched 1:1 using a propensity score based on lesions (liver segment, size, deepness, proximity to a vessel), patients, and procedural characteristics. Ablation sites were followed up with computed-tomography or magnetic resonance imaging to assess the completeness of the ablation and ablation-site recurrence (ASR). Analysis of ASR was performed with the Kaplan–Meier method and Cox regression. Results: In this study, 163 patients underwent the surgical ablation (78 LA, 85 OA) of 333 CRLMs (143 LA, 190 OA). After matching, 220 lesions (110 LA, 110 OA) were analyzed. Ablation was complete in 93.7% (LA) and 97.3% (OA) of the sites (p = 0.195). No difference in ASR was observed (p = 0.351), with a cumulative risk of ASR at 12 months of 9.1% (LA) and 8.2% (OA). After multivariable analysis, ASR was confirmed to be independent of the surgical approach. Conclusion: The findings showed that LA and OA achieve a comparable local control of CRLMs. This result further supports the adoption of a laparoscopic approach for the treatment of CRLMs
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