1,720,959 research outputs found
Single-centre comparative study of laparoscopic versus open right hepatectomy
No full textBackgroundExpansion of laparoscopic major hepatectomy is still limited mainly due to the well-recognised technical difficulties compared to open surgery, and doubts regarding the oncological efficiency when major resections are required.MethodsPatients undergoing open right hepatectomy (ORH) were matched with patients undergoing laparoscopic right hepatectomy (LRH) and compared for perioperative outcomes.ResultsSeventy patients were included: 36 patients underwent LRH and 34 ORH. Operative time was significantly longer for LRH (median, 300 min vs. 180 min for ORH; p?<?0.0001). Intensive care unit (median, 2 days for LRH vs. 4 days for ORH; p?<?0.0001) and postoperative length of stay (5 days for LRH vs. 9 days for ORH; p?<?0.0001) were significantly shorter for LRH. Four laparoscopic cases were converted to open surgery. No significant difference in postoperative complications and mortality was observed between LRH and ORH. Among patients with colorectal carcinoma liver metastases, R0 resection was obtained in 20/21 (95%) cases after LRH, and in 20/25 (80%) after ORH (p?=?0.198). Mid-term overall survival did not significantly differ between the laparoscopic and the open group.ConclusionsLRH can be a safe, effective, and oncologically efficient alternative to open resection in selected cases. Extensive experience in hepatic and laparoscopic surgery is required
Laparoscopic right hepatectomy: a challenging, but feasible, safe and efficient procedure
No full textBACKGROUND: Few centers are undertaking major laparoscopic liver resections, because of the well-recognized technical difficulties and lack of training opportunities.METHODS: The authors describe their technique for laparoscopic right hepatectomy, highlighting relevant details for accomplishing a safe and efficient procedure. Patients were chronologically divided into 2 groups to evaluate the impact of increasing experience on the surgical outcomes.RESULTS: Group I included 17 patients and group II 18 patients. The conversion rate to open or hybrid techniques significantly decreased from 36% in group I to 6% in group II (P = .03). The hospital stay decreased from a median of 6 days in group I to a median of 4 days in group II (P = .05). Complications occurred in 4 patients (11%), of whom 3 were in group I. The mortality was zero.CONCLUSIONS: Laparoscopic right hepatectomy is a safe and efficient procedure when performed at specialized centers with extensive experience in hepatic surgery. Long-term training is necessary to acquire adequate expertise.<br/
Surgical management of benign and indeterminate hepatic lesions in the era of laparoscopic liver surgery
No full textBackground/Aims: The expansion of the laparoscopic approach for the management of benign liver lesions has raised concerns regarding the risk of widening surgical indications and compromising safety. Large single-centre series focusing on laparoscopic management of benign liver lesions are sporadic. Methods: We reviewed a prospectively collected database of patients undergoing pure laparoscopic liver resection (LLR) for benign liver lesions. All cases were individually discussed at a multidisciplinary team meeting. Results: Forty-six patients underwent 50 LLRs for benign disease. Indications for surgery were: symptomatic lesions, preoperative diagnosis of adenoma or cystadenoma, and lesions with an indeterminate diagnosis. The preoperative diagnosis was uncertain in 11 cases. Of these, histological diagnosis was hepatocellular carcinoma in one (9%) and benign lesion in 10 patients (91%). Thirteen patients (28%) required major hepatectomy. Three patients (7%) developed postoperative complications. Mortality was nil. The median postoperative hospital stay following major and minor hepatectomy was 4 and 3 days, respectively. Conclusion: The laparoscopic approach represents a safe option for the management of benign and indeterminate liver lesions, even when major hepatectomy is required. LLR should be only performed in specialized centres to ensure safety and strict adherence to orthodox surgical indication
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
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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